Chemical composition of 20Cr seamless steel pipe (%): Silicon: 0.17～0.37. The chemical composition of 20Cr seamless steel pipe mainly includes elements such as iron, carbon, and chromium, among which the silicon content is usually between 0.17 and 0.37%.
Mechanical properties of 20Cr seamless steel pipe: Tensile strength σb (MPa): ≥835, Yield strength σs (MPa): ≥540, Elongation δ5 (%): ≥10, Reduction of area ψ (%): ≥40, Impact absorption energy Ak (J) ≥47 Hardness: Annealed or high-temperature tempered supply state hardness ≤156HB, Sample size: Sample size 15mm
Heat treatment specifications and metallographic structure of 20Cr seamless steel pipe:
(1) Heat treatment specifications of 20Cr seamless steel pipe: Quenching temperature (°C) better 880, second 780～820, coolant water and oil. Tempering temperature (°C): 200; coolant: water, air.
(2) Welding performance of 20Cr seamless steel pipe: 20Cr parts with a thickness greater than 15mm require preheating to 100-150°C before welding. If the requirements are not high, preheating is not necessary before welding, and tempering heat treatment is not required after welding.
(3) Welding performance of 20Cr seamless steel pipe: 20Cr seamless steel pipe has good weldability, and post-weld heat treatment is generally not required. However, if the thickness of the steel pipe is greater than 15mm, preheating to 100-150°C is required before welding to ensure welding quality.
Manufacturing process of 20Cr seamless steel pipe: The manufacturing process of 20Cr seamless steel pipe includes raw material selection, steelmaking, billet casting, piercing, hot rolling, cold drawing, and straightening. Among these, the cold drawing process is a key step to ensure the dimensional accuracy and surface finish of the steel pipe.
Applications of 20Cr seamless steel pipes: 20Cr seamless steel pipes are widely used in petroleum, natural gas, machining, structural engineering, and automobile manufacturing. Due to their high strength and corrosion resistance, 20Cr seamless steel pipes can meet the requirements of various complex working environments.
(1) In the petroleum and natural gas industry, 20Cr seamless steel pipes are commonly used to transport media such as oil, gas, and water.
(2) In the machining field, 20Cr seamless steel pipes can be used to manufacture various mechanical parts, such as gears and drive shafts.
(3) In the structural engineering field, 20Cr seamless steel pipes can be used in building structures, shipbuilding, and other fields.
(4) In the automobile manufacturing field, 20Cr seamless steel pipes can be used in automobile manufacturing and parts production.
Post time: Feb-02-2026