20# seamless steel pipe material is 20# steel, with strength slightly higher than that of 15# steel, rarely quenched, and has no temper brittleness. It has high cold deformation plasticity and is generally used for processing such as bending, rolling, edge bending, and hammer arching.
20# seamless steel pipe has good welding performance for arc welding and contact welding. During gas welding, it is prone to cracking on parts with small thickness and strict shape requirements or complex shapes. The machinability in cold drawn or normalized state is better than in annealed state, generally used for manufacturing parts with low stress but high toughness requirements.
The material of the 20# seamless steel pipe is: high-quality carbon structural steel grade: 20 steel standards: GB8162-2008 GB/T8163-2008 GB3087-2008 GB9948-2006 GB5310-2008. Its strength is slightly higher than that of 15# steel, rarely quenched, and has no temper brittleness. It has high cold deformation plasticity and is generally used for processing such as bending, rolling, edge bending, and hammer arching. It has good welding performance for arc welding and contact welding. During gas welding, it is prone to cracking on parts with small thickness and strict shape requirements or complex shapes. The machinability in cold drawn or normalized state is better than in annealed state, generally used for manufacturing parts with low stress but high toughness requirements.
● Chemical composition:
Carbon C: 0.17～0.24" Silicon Si: 0.17～0.37 Manganese Mn: 0.35～0.65 Sulfur S: ≤0.035 Phosphorus P: ≤0.035 Chromium Cr: ≤0.25 Nickel Ni: ≤0.25 Copper Cu: ≤0.25
● Mechanical properties:
Tensile strength σb (MPa): ≥410(42) Yield strength σs (MPa): ≥245(25) Elongation δ5 (%): ≥25 Reduction of area ψ (%): ≥5 Hardness: not heat treated, ≤156HB Sample size: sample size 25mm
● Heat treatment specifications and metallographic structure:
Heat treatment specifications: normalizing at 910℃ with air cooling. Metallographic structure: ferrite + pearlite.
● Delivery condition: delivered in either non-heat-treated or heat-treated (annealed, normalized or high-temperature tempered) condition. If heat treatment condition delivery is required, it should be specified in the contract; if not specified, delivery will be made as non-heat-treated. | 
