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With the rapid development of modern industrial technology, the demand for high-performance engineering materials is growing. Among them, 18Ni300, as a special steel with high strength and high toughness, has been widely used in many fields. Heat treatment, as a key process to improve material properties, is crucial to the performance optimization of 18Ni300. This article will introduce the process, characteristics and application of 18Ni300 heat treatment process in detail, in order to provide a reference for process optimization in related fields. 1. Overview of 18Ni300 heat treatment process 18Ni300 is a high-strength alloy steel with excellent corrosion resistance, high temperature strength and oxidation resistance. Heat treatment is a process method that improves the performance of metal materials by changing their organizational structure. For 18Ni300, heat treatment mainly includes solid solution treatment, aging treatment, annealing, normalizing, tempering and carburizing, aiming to improve the strength, hardness, wear resistance, corrosion resistance and other properties of the material. 2. 18Ni300 heat treatment process 1. Solution treatment Solution treatment is the first step of the 18Ni300 heat treatment process. Its main purpose is to evenly dissolve the alloy elements in the matrix, eliminate the residual stress inside the steel, and improve the plasticity and machinability of the steel. The specific operation is to heat the steel to a certain temperature (usually 1050°C to 1150°C), keep it for a period of time, and then cool it quickly. In this process, the alloy elements inside the steel are fully dissolved, and the organizational structure becomes uniform, laying the foundation for the subsequent heat treatment process. 2. Aging treatment Aging treatment is a heat treatment process performed at a lower temperature to promote the precipitation of intermetallic compounds, thereby improving the strength and hardness of the material. For 18Ni300, aging treatment can form appropriate precipitates of its internal alloy elements, further improving the performance of the material. Aging treatment usually needs to be carried out under specific temperature and time conditions to ensure that the number and distribution of precipitates are optimal. 3. Annealing, normalizing, quenching and tempering, and carburizing Annealing, normalizing, quenching and tempering, and carburizing are the subsequent steps of the heat treatment process of 18Ni300. Annealing is to heat the steel to a certain temperature and then cool it slowly to improve its machinability; normalizing is to heat the steel to above the critical temperature and then cool it quickly to improve its strength and hardness; quenching and tempering is to make the steel have good comprehensive mechanical properties through the heating and cooling process; carburizing is to heat the steel in a carbon-containing atmosphere to carburize its surface and improve hardness and wear resistance. These processes work together to further optimize the performance of 18Ni300. 3. Characteristics of 18Ni300 heat treatment process The 18Ni300 heat treatment process has the following significant characteristics: First, through solution treatment and aging treatment, the alloy elements inside 18Ni300 are fully dissolved and precipitated to form a uniform organizational structure, thereby improving the performance of the material. Secondly, the processes of annealing, normalizing, tempering and carburizing cooperate with each other to make 18Ni300 reach the best state in terms of strength, hardness, wear resistance, etc., to meet the needs of different engineering applications. In addition, the precise control of parameters such as temperature and time during the heat treatment process is crucial to the improvement of material performance. Therefore, the heat treatment process needs to strictly follow the operating procedures to ensure the accuracy and reliability of each step.

‌Stainless steel prices have been on a downward trend recently. ‌ Stainless steel futures prices have fallen in recent times. Specifically, the opening price of the main stainless steel contract on September 9, 2024 was 13,470 yuan/ton, and the closing price was 13,275 yuan/ton, down 1.41% from the previous trading day's closing. In the trading of this day, the main stainless steel contract followed the nickel price and fluctuated downward after the opening of the morning session. It recovered to the vicinity of the opening price of the morning session near the closing of the afternoon. The lowest point of the day reached 13,150 yuan/ton, the same as the lowest point on April 1, 2024, and the daily line closed with a large shadow. In the spot market, due to the obvious downward trend of the market and the decline in the opening price of steel mills, most market merchants lowered their quotations by 100 yuan/ton to stimulate shipments. The market was pessimistic, and the inquiry and transaction situation were general‌1. In addition, the fluctuation of stainless steel prices was also affected by macroeconomic factors. For example, changes in macro data such as slowing domestic demand and price differentiation, as well as changes in policy expectations, may have an impact on stainless steel prices. Especially during the window period of incremental policies, changes in market sentiment and expectations may have a further impact on stainless steel prices‌2. In summary, stainless steel prices have shown a downward trend recently, affected by a variety of factors, including market supply and demand, changes in macroeconomic data, and changes in policy expectations.

The maximum operating temperature of 446 stainless steel can reach 1093℃, and it can reach 1200℃ for short-term use. ‌ 446 stainless steel is a material with strong high-temperature corrosion resistance. It will not produce easily flaking oxide scale below 1082℃, which makes it particularly suitable for high-temperature environments such as combustion chambers. In addition, 446 stainless steel has the characteristics of high corrosion resistance, weather resistance and high strength. Although it will become brittle in the temperature range of 700-1000°F, and will show sigma phase embrittlement at a long-term use temperature of 1000-1300°F, this does not hinder its application under specific conditions. The chemical composition of 446 stainless steel includes carbon (C), chromium (Cr), phosphorus (P), sulfur (S), molybdenum (Mo) and nitrogen (N). The content of these elements ensures its unique physical and chemical properties. Its heat resistance makes 446 stainless steel an ideal material for industrial furnaces and heating furnaces, and it can be used stably and for a long time in high-temperature environments. In addition, 446 stainless steel also has good oxidation resistance and sulfurization resistance, and is suitable for applications such as thermocouple protection tubes for heat exchangers and temperature control instruments.

‌310S stainless steel has a nickel content range of 19.00% to 22.00%. ‌ 310S stainless steel is a high alloy stainless steel with a nickel content between 19.00% and 22.00% in its chemical composition. This stainless steel has good oxidation resistance, corrosion resistance and high temperature resistance due to its high proportion of chromium and nickel content, and is particularly suitable for use in high temperature environments, such as high temperature equipment, furnaces, heat exchangers, etc. These characteristics of 310S stainless steel give it high durability, reliability and performance in industrial applications without compromising quality or life. In addition, the hardness (HB) of 310S stainless steel does not exceed 187, the density is 7.98g/cm³, and the melting point is between 1398-1454℃. These physical performance parameters further prove its suitability for high temperature and corrosion resistance requirements in various industrial applications.‌

Monel alloy, also known as Monel, is a nickel copper based alloy containing up to 67% nickel, 28% copper, and 5% other components such as iron, manganese, carbon, and silicon. It has excellent corrosion resistance and high strength, and is widely used in fields such as aerospace, marine engineering, and chemical engineering. Chemical composition: The chemical composition of Monel alloy is Ni67% Cu28％、Fe2.5％、Mn1.5％、C0.3％、Si0.5％、S0.024％、Mg0.01％、Ti0.1％、Al0.5％、P0.02％。 Melting point: The melting point of Monel alloy is 1315-1350 ℃. Maximum high temperature resistance: Monel alloy has excellent performance at high temperatures, with a maximum operating temperature of 538 ℃. Elastic modulus Poisson's ratio: The elastic modulus of Monel alloy is 1.279 × 10 ^ 5 MPa, and the Poisson's ratio is 0.32. Density: The density of Monel alloy is 8.80 g/cm ³.  

In the modern engineering field where material performance requirements are increasingly stringent, stainless steel pipes have become the core choice of many key projects due to their excellent corrosion resistance, high strength and hygienic properties. The following cases will show in detail the excellent performance of stainless steel pipes in actual projects. ​ Project Background​ A large chemical park needs to build a new acid-base liquid transportation pipeline network system. The system needs to transport highly corrosive liquids such as sulfuric acid and sodium hydroxide with a concentration of up to 30% for a long time, and at the same time face the erosion of complex environments such as industrial dust and humid air. The project party has extremely high requirements for the corrosion resistance, sealing and service life of the pipeline materials. After multiple rounds of technical demonstration and material comparison, stainless steel pipes were finally selected as the core material of the pipeline system. ​Stainless steel pipe selection and performance advantages​ Model selection​ The project uses 316L stainless steel pipe, which is an ultra-low carbon austenitic stainless steel. The addition of molybdenum makes it have extremely strong corrosion resistance, especially suitable for harsh media environments such as strong acids, alkalis, and salts.​ Core features​ Super corrosion resistance: 316L stainless steel pipes show excellent tolerance to various inorganic acids, organic acids and salt solutions. In the process of conveying strong acid and alkali liquids in the project, they can effectively resist chemical corrosion and prevent pipeline leakage. The service life is more than 3 times that of ordinary carbon steel pipes. ​High strength and impact resistance: The yield strength of the pipe is ≥170MPa, and the tensile strength is ≥480MPa. Even under high-pressure transportation inside the pipeline and the impact of complex external environment, the structure can still be stable and avoid deformation and rupture. ​ Sanitary and environmental protection: The inner wall of the stainless steel pipe is smooth, not easy to scale and breed bacteria, and the material itself does not precipitate harmful substances. It avoids contamination of the medium in the field of chemical transportation, meets the requirements of environmental protection recycling, and can be 100% recycled. ​Construction application and technical highlights​Professional connection process: It adopts a combination of argon arc welding and double clamping connection. Argon arc welding ensures that the strength of the pipe joint is consistent with the main body, and the sealing reaches the zero leakage standard; the double clamp connection improves the efficiency of on-site installation, shortens the construction period by 25%, and facilitates later maintenance and repair. ​Precise installation design: According to the terrain of the chemical park and the flow direction of the medium, the stainless steel pipe is customized to be bent and cut to ensure a reasonable pipeline layout, reduce liquid transportation resistance, and improve transmission efficiency. At the same time, an insulation layer and an anti-ultraviolet coating are added to the outer wall of the pipeline to further enhance its durability in outdoor environments. ​Strict quality inspection: During the construction process, each section of stainless steel pipe is pressure tested (the test pressure is 1.5 times the working pressure) and non-destructive testing is performed to ensure that the quality of the pipe and the joint meets the standard and ensure the safe operation of the entire pipe network system. ​Project results and customer feedback ​Stable operation: Since the pipe network system was put into use two years ago, it has experienced many tests of highly corrosive liquid transportation and extreme weather, and no leakage, corrosion perforation, etc. have occurred, ensuring the continuity of production in the chemical park.​Significant cost-effectiveness: Although the initial purchase cost of stainless steel pipes is slightly higher than that of ordinary pipes, due to their ultra-long service life and extremely low maintenance frequency, the project's full life cycle cost is reduced by 40%, saving the company a lot of money. ​Highly recognized by customers: The person in charge of the chemical park said: "The excellent performance of stainless steel pipes far exceeded expectations. It not only solved the problem of conveying highly corrosive media, but also greatly reduced our operation and maintenance pressure, providing reliable guarantee for safe production in the park."

In the field of industrial manufacturing, there are strict requirements on the strength, corrosion resistance and processing performance of materials. Stainless steel bars have become the preferred material for the manufacture of many key components due to their excellent comprehensive performance. The following specific cases show the outstanding performance of stainless steel bars in actual projects. ​ Project Background​A well-known food machinery manufacturing company plans to produce a batch of new food processing equipment. The core components of the equipment need to be in contact with acidic and alkaline food raw materials and high-temperature steam environment for a long time, and the high precision and stability of the components must be guaranteed to meet the food production safety standards. After comparing and screening many materials, it was decided to use stainless steel bars as the production material for core components. ​Stainless steel bar selection and performance advantages​ Model selection​316L stainless steel bars are selected. This model belongs to low-carbon austenitic stainless steel. With the blessing of molybdenum elements, it has excellent corrosion resistance and high temperature resistance, which fully meets the hygiene and safety standards of food machinery manufacturing.​ Core Features​Super corrosion resistance: 316L stainless steel rods have good tolerance to organic acids, inorganic acids and salt solutions. In the acid-base environment of food processing, they can effectively resist corrosion, avoid material loss and contamination of food raw materials, and their service life is 40% longer than that of ordinary stainless steel rods. ​Sanitary and safe: It complies with international food contact material safety standards (such as FDA, LFGB, etc.), has a smooth surface and is not easy to breed bacteria, ensuring the safety and hygiene of the food processing process. ​High strength and good processability: The yield strength reaches 170MPa and the tensile strength exceeds 480MPa, which can withstand the high load when the equipment is running; at the same time, it has good cutting, drilling and forming performance, which is easy to process into parts with complex shapes. ​Processing applications and technical highlights​Precision processing: Use CNC lathes to perform high-precision turning and milling on stainless steel rods, and control the dimensional error within ±0.01mm to ensure the close fit of components and the stable operation of equipment. For example, when processing food stirring shafts, low noise and high-efficiency stirring can be achieved through precise size control.​Surface treatment: Polish the processed parts to make the surface roughness reach Ra0.8μm, which not only improves the aesthetics, but also further enhances the anti-fouling and corrosion resistance; some parts are passivated to form a dense oxide film to enhance the protective performance. ​Welding process: For parts that need to be spliced, argon arc welding technology is used to ensure that the strength of the welding part is equivalent to that of the matrix, and the weld is smooth and flat to avoid residual impurities affecting the quality of food. ​ Project results and customer feedback​Performance compliance: After the equipment was put into use, after half a year of high-intensity operation, the core components did not have corrosion, deformation and other problems, effectively ensuring the stable operation of the food processing production line. ​Customer recognition: The person in charge of the company said: "The parts made of 316L stainless steel bars have excellent corrosion resistance and precision, which greatly reduces the equipment maintenance cost and also improves the market competitiveness of our products." ​Economic benefits: Due to the long life and low maintenance requirements of stainless steel bars, the cost of the equipment over its entire life cycle is reduced by about 30%, bringing significant economic benefits to the company.​This case fully proves that stainless steel bars, with their excellent performance and reliable quality, can meet the stringent requirements of the precision manufacturing industry and provide stable and efficient material solutions for various industrial projects. If you have any needs related to stainless steel bars, please contact us for professional selection suggestions and customized services.

Stainless steel plate selection and core advantagesMaterial: 316L stainless steel plate (low-carbon austenitic stainless steel)Core characteristics:Super corrosion resistanceContains molybdenum (Mo), and its seawater corrosion resistance is more than 30% higher than that of 304 stainless steel, which is particularly suitable for coastal high salt spray environment.Passed 1000 hours of salt spray test (ASTM B117 standard), with no rust or oxidation marks on the surface.Balance of high strength and light weightThe plate thickness is only 3mm, and the tensile strength reaches 520MPa, which meets the load requirements of the building structure and reduces the wall load by 20%.Customized aesthetic designSurface treatment: Matt brushed process, presenting a delicate metal texture, reducing light pollution while enhancing the three-dimensional sense of the building.Size customization: The largest single plate is 6m×2m, and the seamless splicing process achieves an integrated facade effect and enhances the modern sense of the building. Case Value SummaryThis project uses innovative 316L stainless steel plates to perfectly balance corrosion resistance, structural strength and modern aesthetic design, providing a benchmark solution for construction projects in high humidity and high corrosion environments overseas. We can provide customized stainless steel plates (such as 201/304/316L and other materials, mirror/brushed/etched surface treatments) according to different needs, suitable for commercial buildings, bridge projects, landscape decoration and other scenarios.