Seamless steel pipe, as the name implies, refers to a steel pipe without seams during the manufacturing process, which is directly formed by perforation, hot rolling, or cold drawing. S31603 seamless stainless steel pipe not only inherits the excellent properties of S31603 stainless steel but also has higher pressure bearing capacity and better fluid transmission efficiency due to the seamless structure. It is widely used on occasions with extremely high requirements for material performance. S31603 seamless stainless steel pipe, as a high-performance alloy material, plays a pivotal role in industrial production and daily life.
First, the basic characteristics of the S31603 seamless stainless steel pipe
Common implementation standards for S31603 seamless stainless steel pipe: GB/T14976, GB/T9948, GB/T13296, ASMEAS-213/SA-213M, ASMESA-312/SA-312, ASTMA312.
Chemical composition of S31603 stainless steel seamless pipe: Carbon: content ≤0.030%, reducing carbon content and improving welding performance. Silicon: content ≤1.00%, helping to maintain the crystal structure. Manganese: content ≤2.00%, affecting mechanical properties and hardness. Phosphorus: content ≤0.045%, helping to improve corrosion resistance. Sulfur: content ≤0.030%, affecting processing performance. Chromium: content between 16.00% and 18.00%, providing corrosion resistance. Nickel: content between 10.00% and 14.00%, increasing corrosion resistance. Molybdenum: content between 2.00% and 3.00%, improving resistance to sensitized intergranular corrosion. Nitrogen: no specific content is provided, usually very low, helping to improve welding performance.
Mechanical properties of S31603 stainless steel seamless pipe: Melting point: 1375~1450C; solution treatment: 1010~1150C. Tensile strength σb (MPa): ≥480, conditional yield strength σ0.2 (MPa): ≥177, elongation δ5 (%): ≥40, cross-sectional shrinkage ψ (%): ≥60, hardness: ≤187HB; ≤90HRB; ≤200HV.
Second, the manufacturing process of S31603 stainless steel seamless pipe
The manufacturing process of S31603 stainless steel seamless pipe mainly includes raw material preparation, smelting and casting, hot rolling or cold drawing, heat treatment, pickling, passivation, inspection, and packaging.
1. Raw material preparation: Select high-quality S31603 stainless steel plates or round billets as raw materials to ensure that the chemical composition and physical properties of the materials meet the standards.
2. Smelting and casting: The raw materials are sent to the electric arc furnace or vacuum induction furnace for smelting, and uniform molten steel is obtained by precisely controlling the smelting temperature and chemical composition. Then casting is carried out to form a preliminary tube billet.
3. Hot rolling or cold drawing: Select the appropriate forming process according to the requirements of pipe diameter and wall thickness. Hot rolling is suitable for large-diameter thick-walled pipes, which are formed by rolling at high temperatures; cold drawing is suitable for small-diameter thin-walled pipes, and the strength and precision of the material are improved by cold deformation.
4. Heat treatment: Through solid solution treatment, stabilization treatment, and other processes, the stress inside the steel pipe is eliminated, the organizational structure is optimized, and the comprehensive performance of the material is improved.
5. Pickling and passivation: Pickling the surface of the steel pipe to remove the oxide scale and dirt, and then passivation treatment is performed to form a dense oxide film to improve corrosion resistance.
6. Inspection and packaging: Strict appearance inspection, non-destructive testing (such as ultrasonic testing, and radiographic testing) and mechanical property testing are carried out on the finished steel pipe to ensure product quality. Finally, anti-rust treatment and packaging are carried out for transportation and storage.
Third, the application field of S31603 seamless stainless steel pipe
S31603 seamless stainless steel pipe is widely used in the following fields due to its excellent corrosion resistance, high temperature resistance, and high strength characteristics:
1. Chemical industry: used to manufacture chemical equipment, pipeline systems, storage tanks, etc., and withstand the erosion of various corrosive media.
2. Marine engineering: used for offshore platforms, ships, submarine pipelines, etc., to resist seawater corrosion and marine biological attachment.
3. Food processing: used for pipelines and equipment in food industries such as dairy products, beverages, and beer to ensure the hygiene and safety of food.
4. Medical equipment: used to manufacture surgical instruments, medical equipment components, etc., to meet the high requirements of materials in the medical field.
5. Energy field: used for pipeline systems in high temperature and high pressure environments such as nuclear power plants and thermal power plants to ensure the safe transmission of energy.
Fourth, the performance advantages of S31603 seamless stainless steel pipe
1. Excellent corrosion resistance: excellent performance in a variety of corrosive media, especially in environments containing chloride ions, the corrosion resistance is far superior to 304 stainless steel.
2. Good high temperature resistance: It can maintain stable mechanical properties and corrosion resistance at high temperatures, and is suitable for applications in high temperature environments.
3. High strength and toughness: The seamless structure improves the pressure bearing capacity and impact resistance of the steel pipe, ensuring safe operation under extreme conditions.
4. Good processing performance: It is easy to cut, weld, bend, and process into various shapes to meet the needs of complex working conditions.
5. Long-term stability: After proper heat treatment, S31603 stainless steel seamless steel pipe can maintain good long-term stability and service life.
Post time: Jun-17-2025