Introduction to Advanced Technologies and Equipment for Energy-Efficient, Emission-Reducing, and Clean Production in Heat Treatment

Tianlong Technology Furnace Industry (Wuxi) Co., Ltd.

　　Summary:

　　I. Large-scale technological transformation has driven the technological advancement of heat treatment equipment

　　II. Tianlong Company is committed to the manufacturing of "sharp tools"

　　III. Introduction of Tianlong Company's main precision, energy-efficient, and environmentally friendly products

　　⑴ Large energy-efficient controllable atmosphere pit-type carburizing furnace

　　⑵ Large energy-efficient controllable atmosphere bell-type nitriding furnace

　　⑶ Controllable atmosphere sealed box-type multi-purpose furnace

　　IV. A strong backing for clean production in heat treatment

　　I. Large-scale technological transformation has driven the technological advancement of heat treatment equipment

　　There is an old Chinese saying, "If you want to do a good job, you must first sharpen your tools." The development of the machinery industry shows that advanced equipment and manufacturing technologies are the key to the modernization of the machinery industry. Heat treatment equipment and process technologies are "sharp tools" used to improve the intrinsic performance of mechanical products, and are an indispensable part of advanced mechanical equipment.

　　Ten years ago, the technology and equipment of China's heat treatment industry were still very backward. At that time, although there were no less than hundreds of thousands of heat treatment equipment nationwide, the proportion of advanced equipment such as controllable atmosphere was less than 10%. In most heat treatment enterprises, the heat treatment sites were filled with old three furnaces (box-type, pit-type, and salt bath furnaces) with a service life of 30 to 40 years. The workshops were filled with pungent odors, sewage flowed, heat treatment processing was mostly manual, and heat treatment quality was difficult to guarantee. The phenomenon of "high energy consumption, high pollution, high cost, and low quality" was heartbreaking.

　　In order to change the backward appearance of China's heat treatment industry, with the promotion of the national energy-saving technological transformation policy, and with the concerted efforts of the heat treatment industry and equipment manufacturing industry, especially driven by the large-scale technological transformation of the automobile, aviation, weaponry, heavy-duty machinery, and wind power industries, China's heat treatment industry has been undergoing gratifying changes in recent years. These changes are mainly reflected in the following aspects:

　　1. The large-scale technological transformation and equipment upgrades of these enterprises have fundamentally changed the proportion of advanced equipment, and the proportion of equipment such as controllable atmosphere and protective atmosphere has reached more than 90%. It has basically achieved advanced heat treatment production with less oxidation, less pollution, less distortion, less defective products, less manual labor, and less quality dispersion.

　　2. In these new heat treatment equipment, energy-saving materials and imported components are generally used. The application of a large number of internationally renowned advanced control instruments, components, and pipe valves and switches has improved the reliability of the equipment and improved the intelligent and unmanned control and management level of heat treatment.

　　3. In recent years, the promulgation and implementation of national standards, industry standards, and enterprise standards using international advanced indicators have promoted the continuous updating and technological progress of heat treatment equipment and processes. It has improved the efficiency of heat treatment production, and at the same time promoted energy saving and reduced and curbed the emission of three wastes.

　　Among the equipment selected by these technologically transformed enterprises, some are advanced equipment imported at high prices, some are foreign-funded, and some are produced by some domestic enterprises. It is worth noting that these domestically produced equipment, competing with imported and wholly foreign-owned products, have achieved remarkable results. In terms of performance indicators, reliability, energy consumption indicators, and automation level, they are comparable to imported equipment, and even many indicators are superior to foreign-funded products. The price of domestically produced equipment is much lower than that of imported and foreign-funded products. This has enabled technologically transformed enterprises to achieve significant savings in capital investment and operating costs, saving at least 25% of equipment investment.

　　The large-scale technological transformation measures of many large domestic enterprises are quietly rewriting the history of the current situation of heat treatment in China. At present, although these advanced heat treatment equipment have not yet been well popularized throughout the country, we are confident that as long as we are committed to promotion, committed to continuous improvement of the performance of heat treatment equipment, and committed to providing high-quality services to users, we believe that in the near future, advanced domestic equipment will surely replace those old three furnaces, turning energy-intensive users into energy-saving role models, and polluting enterprises into clean factories. This will enable China's heat treatment industry to eventually reach the forefront of the world.

　　II. Tianlong Company is committed to the manufacturing of "sharp tools"

　　Tianlong (TLON) Company, as a private high-tech enterprise, has taken the manufacturing of "precision, energy-efficient, and environmentally friendly" heat treatment equipment as its lofty mission since its establishment. In the process of product development, the company has put forward the research and development direction of "three hundred percent" for its self-developed products: ⑴ 100% of products use controllable atmosphere and protective atmosphere; ⑵ 100% of furnace linings use energy-saving materials; ⑶ 100% of key supporting components use internationally renowned components. It is wholeheartedly committed to the research and development of highly automated, high-precision, high-reliability, environmentally friendly, clean, and energy-efficient heat treatment equipment. In discussions with customers, it always strictly demands itself with advanced domestic and international standards and insists on providing users with the best heat treatment equipment.

　　The company has always adhered to the path of independent development and building TLON's core technology, possessing multiple patented technologies and solving technical problems in energy saving, efficiency, environmental protection, and safety in controllable atmosphere heat treatment equipment and processes. It has formed a core competitiveness combining products and technology patents.

　　In order to continuously improve the technical level of its products, Tianlong (TLON) Company cooperates with German STANGE Company, German PE Company, and Canadian NITREX Company to continuously introduce and apply the latest and most advanced technologies internationally, developing and researching new energy-saving products suitable for Chinese conditions.

　　Since its establishment eight years ago, the company has provided hundreds of sets of technologically advanced energy-saving products to users, winning high praise from users. Tianlong's leading product, the "large controllable atmosphere pit-type carburizing furnace production line", currently occupies more than 70% of the domestic market share. It has served national key large enterprises such as "Nanjing High-Gear, Second Heavy Machinery, Baosteel Suzhou Metallurgy, Hangzhou Gear, Wanxiang Bearing, CITIC Heavy Machinery, Zhenhua Port Machinery, China Steel Heavy Machinery, Northern Heavy Industries, Qin Chuan Development, and Huarui Group". These enterprises have therefore significantly reduced heat treatment energy consumption and reduced environmental pollution.

　　Tianlong's main energy-saving products also include controllable atmosphere multi-purpose furnace production lines (sealed box-type, through-type, bottom-loading vertical-type), controllable atmosphere nitriding furnace production lines (sealed box-type, pit-type, bell-type), controllable atmosphere pusher furnace production lines, protective atmosphere salt quenching bainite production lines, controllable atmosphere roller hearth furnaces, roller hearth furnaces, mesh belt furnace production lines, and other heat treatment equipment and auxiliary facilities.

　　Tianlong has multiple products that have passed national professional appraisal, and their technical performance has reached the current international advanced level.

　　The national industry standard "Technical Requirements for Large Controllable Atmosphere Pit-type Carburizing Furnace Production Line", drafted by Tianlong Company, has passed the review of the State Bureau of Standards and the industry, and will be officially promulgated in 2010.

　　III. Introduction of Tianlong Company's main precision, energy-efficient, and environmentally friendly products

　　(1) Large energy-efficient controllable atmosphere pit-type carburizing furnace

　　1. Use: Primarily used for the precision heat treatment of transmission components in large heavy-duty machinery; it can also be used for carburizing heat treatment of small and medium-sized parts with maximum furnace loading. Complete technical specifications, working area dimensions: diameter φ1000～φ5000, height 1000～6000mm, maximum load: 2～60t.

　　2. Main Features:

　　⑴ Successful application of various special heat-resistant steel structure technologies in large pit-type carburizing furnaces, including spherical head-shaped air guide hoods, full corrugated muffles and guide tubes, free-hanging air guide hoods, and open furnace cover insulation packages. This solves problems such as thermal stress deformation and cracking of heat-resistant steel components at high temperatures, increasing service life by more than 3 times. Many technologies in this furnace are innovative designs with independent intellectual property rights and are currently applying for technical patents.

　　⑵ Using all-fiber furnace lining, optimized design, reasonable heating power configuration, improved heating element component structure, improved sealing and thermal short-circuiting phenomena, and improved overall energy efficiency of the equipment. Compared with conventional carburizing furnaces with the same furnace load, it can save about 25% of electricity, reduce electricity consumption by more than 50% compared with small RQ3 conventional carburizing furnaces, and compared with muffle-less furnaces from a certain foreign brand company, it still has lower electricity consumption, less process media usage, and significantly reduced exhaust emissions under the same size specifications. (3) Using an advanced intelligent control system. Temperature control of main control + joint control + monitoring, multi-system, multi-mode, multi-parameter carbon potential control, integrated intelligent control system, complete interlocking alarm system, computer carburizing expert system and management system, cluster-type upper and lower computer network information management system, enabling precise control of large workpieces at high temperatures and high carbon potential. This not only meets the quality requirements of carburizing layer depth and microstructure, but also improves carburizing speed, shortens process time, saves electricity and process materials, and significantly reduces operating costs.

　　3. Main Conclusions of Technical Appraisal

　　Appraised by the China Heat Treatment Industry Association, experts unanimously agreed that the RQD series of large controllable atmosphere pit-type carburizing furnaces have stable and reliable product quality, small heat storage, fast heating and cooling speeds, and high efficiency and energy saving. Precise control of the carburized hardened layer and microstructure of the product can be achieved, reaching the advanced technical level of similar international equipment.

　　4. Promotion Prospects and Energy-Saving Benefits

　　⑴ For large pit-type carburizing furnaces, calculating the heat loss at 0.129kw/㎡ based on the furnace wall surface temperature rise from 50℃ to 40℃, and the annual operating time of the equipment at 7200 hours, the φ2.0×2.0 pit-type carburizing furnace wall surface area is approximately 68㎡, this alone can reduce furnace wall heat loss electricity consumption by 63,000 degrees per year.

　　Except for the furnace bottom, which needs to use refractory insulation bricks for load-bearing, the furnace wall of the pit-type carburizing furnace is changed from the traditional refractory insulation brick structure to an all-fiber structure. The φ2.0×2.0 pit-type carburizing furnace wall uses refractory insulation bricks, and the furnace wall heat storage reaches 1885kw. Changing to an all-fiber structure, the furnace wall heat storage is only 518kw. Based on an annual operating time of 300 days and one furnace cycle every 4 days, this alone can reduce the heat loss electricity consumption by about 102,500 degrees per year.

　　The above two items, plus the all-fiber structure of the furnace cover, the strength design structure of the muffle, the heating element installation structure, and the reasonable handling of various thermal short circuits, can reduce the electricity consumption of the φ2.0×2.0 pit-type carburizing furnace by about 170,000 degrees per year.

　　⑵ Conventional carburizing processes typically use a carburizing temperature of 920℃ and a carbon potential of less than 1.1%CP. Because the RQD large pit-type carburizing furnace greatly improves the accuracy and control methods of temperature and carbon potential control, it allows carburizing to be performed at higher temperatures and higher carbon potentials during the carburizing process, not only ensuring product quality but also significantly shortening the carburizing process time.

　　In fact, the carburizing temperature can be increased to 950～970℃, and the carburizing carbon potential can be increased to 1.25%CP for strong carburizing. The total process cycle can be shortened by at least 30%, greatly improving equipment utilization and significantly reducing overall energy consumption.

　　This type of equipment not only meets the carburizing heat treatment requirements of large workpieces but also, as long as the requirements for similar materials and similar carburizing layer depths are met, can achieve maximum furnace loading for carburizing heat treatment of small and medium-sized parts.

　　With the promotion of hard surface treatment technology for transmission components of large heavy-duty machinery and the continuous advancement of new rounds of energy-saving and emission-reduction technological transformation, the market demand for such equipment will rapidly expand, with an estimated annual demand exceeding 100 sets and an output value reaching 200 million RMB.

　　Based on the estimated 800 sets of large pit-type carburizing furnaces in China by 2015, the total annual electricity saving can reach more than 140 million degrees.

　　(II) Large Energy-Saving Controllable Atmosphere Hood-Type Nitriding Furnace

　　1. Use: Mainly suitable for surface nitriding, nitrocarburizing, oxynitrocarburizing, pre-oxidation, post-oxidation, and other controllable atmosphere heat treatments of products such as gears, shafts, and molds. Complete technical specifications, working area dimensions: diameter φ1000～φ4000, height 1000～6000mm, maximum load: 2～60t.

　　2. Basic Situation:

　　(1) Most gas nitriding furnaces currently used in China generally use ammonia decomposition instruments to control nitrogen potential or purely manual methods. These nitriding furnaces have simple structures, high energy consumption, low control accuracy, and difficult-to-control product quality. Especially for products with deeper penetration layers, it is even more difficult to achieve precise control of the penetration layer and internal structure, resulting in deviations in the nitriding layer depth and microstructure, as well as significant waste of electricity and process materials, failing to meet the product requirements of high-quality nitrided parts.

　　(2) Traditional gas carburizing furnaces have long atmosphere establishment and cooling process times. Under the same production plan, the number of pit-type furnaces is often greater than that of hood-type furnaces to meet production capacity needs, resulting in a significant increase in equipment investment and operating energy costs.

　　Tianlong Company's technical personnel, combining years of design experience and China's national conditions, have innovatively designed the RFN series of controllable atmosphere bell-type nitriding furnaces, which possess internationally advanced technology. The equipment uses an all-fiber furnace lining and the latest integrated and informational control technology, integrating temperature, nitrogen potential, PLC, recording, alarm, expert system, dynamic control, and management system functions. It uses a hydrogen probe to directly measure nitrogen potential, a mass flow meter to control the supply and measurement of feedback data of process media, and intelligent PID adjustment control to achieve precise control of the nitriding process. This significantly reduces the consumption of process media, to only 1/3 of that of conventional nitriding processes. The furnace temperature uniformity can be controlled within ±3℃. Actual comprehensive energy consumption is saved by 30% or more.

　　The exhaust gas from this equipment is completely discharged through automatic combustion. Compared with conventional nitriding furnaces, exhaust gas emissions are safer, and there is basically no ammonia smell in the workplace, fully meeting environmental emission requirements.

　　3. Main Conclusions of Technical Appraisal

　　Identified by the China Heat Treatment Industry Association, experts unanimously agreed after appraisal that the controllable atmosphere bell-type nitriding furnace produces products with stable and reliable internal quality, small heat storage, fast heating and cooling speeds, and high efficiency and energy saving. It can achieve precise control of the nitriding hardened layer and microstructure of the product, reaching the advanced technological level of similar international equipment.

　　4. Promotion Prospects and Energy-Saving Benefits

　　⑴ Since its operation in 2007, the controllable atmosphere bell-type nitriding furnace has produced stable and reliable product quality, processing over 30,000 tons of various products. All technical performance indicators have met the design requirements, especially the high precision of temperature and nitrogen potential control. The equipment operates stably and reliably, fully meeting product design requirements. The overall technical performance and manufacturing technology of this equipment are comparable to those of similar international equipment, leading domestically, and achieving good economic and social benefits.

　　⑵ With the rapid development of the machinery industry in recent years, the requirements for nitriding treatment of certain products are also increasingly high, placing higher demands on related equipment. In recent years, China's machinery processing industry has developed well and has become an important manufacturing and assembly base for global machinery. As major companies worldwide enter the Chinese market, the technical requirements for various components are also increasingly high, especially for precision transmission components. The advantage of nitriding treatment is that the processing temperature of the workpiece is lower, the workpiece can obtain higher surface hardness and wear resistance, and the workpiece deformation is smaller. Industries such as wind power generation, shipbuilding, aerospace, steel, military industry, automobiles, petrochemicals, and mining all have products that require nitriding treatment. Traditional equipment and processes cannot achieve precise control of the nitriding process. Most nitriding products with high requirements, due to the previous inability to manufacture high-end nitriding equipment domestically, choose foreign nitriding heat treatment equipment. The price of related equipment is high, and long-term maintenance and service are difficult to guarantee, resulting in high processing and maintenance costs. Therefore, high-precision control nitriding equipment has a large market in China. The controllable atmosphere bell-type nitriding furnace is characterized by a small footprint, precise temperature and atmosphere control, a large loading capacity, energy efficiency, and low comprehensive cost. The estimated annual demand for this type of equipment is around 80 sets, with an output value exceeding 250 million yuan, showing good development prospects.

　　⑶ Compared with well-type nitriding furnaces, the initial investment cost of bell-type nitriding furnaces is approximately 17% higher. However, due to the 40% higher efficiency of the new bell-type furnace, the investment cost can be quickly recovered. More importantly, the bell-type furnace adopts multiple energy-saving measures and advanced control methods such as nitriding experts, and the automatic control configuration is comparable to advanced foreign products. The single-unit power consumption of the equipment is significantly reduced, and the consumption of process media is only 1/3 of the usual process, significantly improving overall efficiency. Taking a φ1.3×2.0M bell-type nitriding furnace as an example, the unit power consumption can be reduced to 0.452 kwh/kg, which meets the power consumption assessment requirements of the clean production process in the heat treatment industry that the Ministry of Industry and Information Technology is about to release and is close to the power consumption indicators of similar advanced foreign products.

　　A φ1.3×2.0M bell-type nitriding furnace processes approximately 1500 tons of workpieces annually, saving up to 249,000 kWh of electricity per year. Based on an estimated 500 sets of bell-type nitriding furnaces in China by 2015, the total annual electricity savings could exceed 120 million kWh.

　　(3) Controllable Atmosphere Sealed Box Multi-purpose Furnace

　　1. Uses: Mainly used for carburizing, carbonitriding, bright quenching, and normalizing heat treatment of various mechanical parts such as gears, bearings, chains, and hydraulic components in the automotive, motorcycle, engineering machinery, machine tool, powder metallurgy, and petrochemical industries. Multiple specifications are available, with a maximum single-batch loading capacity of 450-3500 kg and a heating capacity of 270-1000 kg/h, meeting the needs of different customers, products, and production volumes.

　　2. Basic Situation:

　　The controllable atmosphere sealed box multi-purpose furnace is one of the most advanced furnace types in the world. Through cooperation with STANGE, PE, and NITREX companies, Tianlong Company continuously introduces and absorbs the latest and most advanced international technologies to develop a second-generation controllable atmosphere heat treatment multi-purpose furnace with high cost performance that suits China's national conditions. The main features of this product are:

　　⑴ Using a new type of anti-permeation fiber material as the furnace lining and eliminating the inner muffle device significantly reduces heat accumulation. This reduces the equipment's heating and cooling time and makes the equipment's energy consumption 20% lower than similar domestic and international products, with 15% less installed power.

　　⑵ The use of a muffle-less circular furnace chamber and an improved airflow circulation system avoids airflow dead zones, improving the uniformity of temperature and atmosphere in the furnace and reducing the surface area of the shell, thereby reducing heat loss.

　　⑶ The oil cooling in the quenching tank uses a heat pipe air-cooled heat exchanger and fully sealed equipment, completely avoiding the possibility of water leaking into the oil pool, making the equipment safer than similar domestic and international products and maximizing safety.

　　⑷ Eight safety measures are adopted, including safety temperature interlock, complex process step interlock, furnace pressure, power failure, overheating, safety nitrogen, and safety bend pipe, ensuring foolproof equipment operation safety.

　　⑸ All key and main components of the product use imported components.

　　⑹ Using computer carburizing expert system and management system software, offline simulation and online dynamic control can be achieved. When using the carbon potential automatic setting function, there is no need to set the carbon potential; the online module will automatically calculate the most suitable carbon potential based on the carbon black in the furnace and the carbide of the workpiece being carburized. When using process simulation design, the process time and carbon concentration distribution curve and numerical values can be simulated according to the given material, depth, temperature, and other conditions. The high degree of automation and intelligence ensures the quality of workpiece processing, shortens the process time, and saves energy and process material consumption.

　　⑺ Carbon potential, temperature, and action procedures can be controlled by computer networking, enabling fully automated and group control of all equipment on the production line. Remote control and network management can be achieved.

　　3. Energy Saving Benefits

　　(1) The RM9-TLON series controllable atmosphere multi-purpose furnace is one of the leading products of Tianlong Company. Since its development in 2003, hundreds of units have served across the country. Practical applications have fully demonstrated that this type of furnace has advantages such as high efficiency, energy saving, advanced technology, safety and reliability, simple operation, and low operating costs, conforming to the current development direction of precise, clean, and energy-saving heat treatment technology. (2) A comparison of new and old products shows that Tianlong's second-generation multi-purpose furnace has significantly improved performance and efficiency compared to conventional multi-purpose furnaces, especially in energy saving. The typical power consumption per furnace is reduced by 39%~42%, the power consumption of the empty furnace is reduced by more than 33%, the weight of the tray and tooling is reduced by 50kg, and the consumption of process media is saved by more than 40%. Due to the wide range of applications, high level of automation, and good processing quality of box-type multi-purpose furnaces, market demand has been increasing year by year. The current annual demand in China is estimated to exceed 500 units. Each furnace saves about 180,000 kWh per year. Based on the 3,000 box-type multi-purpose furnaces in the Chinese market in 2015, the total annual electricity saving exceeds 540 million kWh.

　　(3) Carburizing is the most energy-intensive process among the five major heat treatment processes. Saving energy in the carburizing process is of great significance to the reduction of overall heat treatment energy consumption. The power consumption of box-type multi-purpose furnace carburizing is the most economical among all carburizing furnaces. According to statistics, the unit power consumption of the carburizing and quenching process in the heat treatment industry in 2008 was about 1170 kwh/t, and the new target is set at 960 kwh/t. In Tianlong Company's 2009 products, the average power consumption of box-type multi-purpose furnace carburizing and quenching was 558 kwh/t. This fully meets the quota indicators of the industry's clean production and reaches the advanced indicators of similar products in industrial powers such as Europe, America, and Japan.

　　IV. A strong backing for clean production in heat treatment

　　With the market-oriented, internationalized, and professional development of the heat treatment industry, the importance of heat treatment has become more prominent. High-level and high-quality heat treatment processing has also put forward higher requirements for heat treatment equipment. As a professional manufacturer of heat treatment equipment, manufacturing more and better, high-efficiency, low-energy-consumption, intelligent, and pollution-free clean heat treatment equipment is our inescapable responsibility.

　　In addition to the above-mentioned leading products, Tianlong Company has also developed energy-saving clean production equipment, including: controllable atmosphere through-type multi-purpose furnace, controllable atmosphere bottom-loading multi-purpose furnace, controllable atmosphere box-type and pit-type nitriding furnace, controllable atmosphere push-type furnace production line, protective atmosphere salt quenching bainite production line, controllable atmosphere roller furnace, roller hearth furnace, and mesh belt furnace production line, etc. These equipment still adhere to Tianlong Company's "three hundred percent" tradition (100% of products use controllable atmosphere and protective atmosphere; 100% of furnace linings use energy-saving materials; 100% of key supporting components use internationally renowned brand components), ensuring high efficiency, energy saving, and high reliability of the products. In addition, another prominent feature is its high level of automation, intelligence, digitalization, and network information management functions. These functions include:

　　● Full Chinese version operating system and user-friendly human-machine interface.

　　● Heat treatment process program compilation and process simulation design.

　　● Temperature, atmosphere, and all actions can be controlled by computer network. Each furnace's programmable controller can also be used as a terminal, connected to the computer local area network. Authorized computers within the network can observe the operation status of each furnace in real time. Realizing networked and intelligent remote control.

　　● True color display of equipment operating status and process status, with clear and realistic images, accurate and intuitive.

　　● Equipment operation fault self-diagnosis function. Each switch, valve, instrument, and action point is connected to the computer, with equipment operation analysis, fault location and cause judgment, and fault handling prompts. Automatic cameras can also be set up in locations that are difficult to observe, realizing all-round monitoring.

　　● Ethernet (100MBit) forms a local area network with multiple programmable controllers to perform operation and management instructions and control.

　　● Display of process and equipment operating status, including process programs, operating diagrams, setpoint curves and actual value curves, curve zoom, dynamic control quantities, and process data.

　　● Control and display recording of temperature, atmosphere, various infiltrated medium flow rates, and furnace pressure. The display and recording of current and historical faults (including fault occurrence, fault response, and fault elimination) are complete, ensuring that the equipment is completely under high-level intelligent, digital, and networked control and management, effectively controlling quality, energy consumption, and three-waste emissions.

　　A good clean heat treatment equipment can bring users excellent heat treatment quality and good economic benefits. This requires the product to have excellent control performance, extremely high reliability, energy saving and environmental protection, and more user-friendly operation functions. This is exactly the equipment we want to provide to users. In addition, we also strive to provide users with high-quality pre-sales, in-sales, and after-sales services. To be a strong backing for clean production.

　　Our next goal is, on the one hand, to promote the application of achievements, allowing more customers to use advanced heat treatment equipment and obtain better economic benefits. On the other hand, we are also looking for gaps. We have read Mr. Fan Dongli's introduction of the "US Heat Treatment Technology Development Roadmap", and the eight goals proposed by the Americans for 2020 have given us great inspiration. Compared with our American counterparts, we should consider how to continuously narrow the gap with industrial powers. China's development in the 30 years since the reform and opening up has covered the path of industrial powers for hundreds of years. China's high-speed rail, automobiles, and steel have risen to the world's number one, following a path with Chinese characteristics. China's heat treatment processing and heat treatment equipment can also, according to national conditions, under the leadership of the Ministry of Industry and Information Technology, under the organization of industry associations, and with the participation of numerous enterprises and scientific research institutions, forge a path with Chinese characteristics. Only then can we transform from a heat treatment powerhouse into a heat treatment strong country, and only then can we achieve the best results in energy saving and emission reduction.

　　Currently, national documents such as the "Equipment Manufacturing Industry Adjustment and Revitalization Plan", the "Implementation Plan for Clean Production in the Heat Treatment Industry", and the "Technical Requirements for Evaluation of Clean Production Levels in the Heat Treatment Industry" are being gradually released and implemented, like a strong east wind, driving the equipment upgrading and technological progress of China's heat treatment industry. This is also an excellent development opportunity for our equipment manufacturing enterprises. We, the Tianlong people, must firmly grasp this once-in-a-lifetime opportunity, strive hard, bravely take the lead, make the best heat treatment furnaces in China, and provide the best service for heat treatment users.

　　Our after-sales service personnel often pass on users' problems to the R&D department, and the R&D department often takes these problems as R&D projects for research, testing, and development, solving problems for customers and improving products. Only continuously improved products can become the best products. Three-waste emissions are an aspect that heat treatment users often reflect on. We have strengthened R&D in this area. Currently, ammonia environmental emission devices and automatic brine separation devices have entered the practical stage, waste heat recycling and comprehensive utilization technology is very mature, and waste liquid decomposition and recovery is also under experimentation... Protecting the environment and reducing three-waste emissions are the efforts that we, the Tianlong people, should make for low-carbon life and for protecting the earth's ecological environment.

　　We are willing to work together with colleagues in the heat treatment industry, sharing weal and woe, moving forward hand in hand, jointly coping with risks and challenges, and sharing development opportunities, to make due contributions to the revitalization of China's heat treatment industry!