20 # steel pipe

20 # steel pipe material 20 steel, usually 20 seamless steel pipe
20 # steel pipe material: high-quality carbon structural steel  Grade: 20 Steel Standard: GB / T 699-1988, API5L
● Features and Scope: higher intensity than the 15 steel, very little quenching, no temper brittleness. High cold deformation plasticity, usually for bending, welding performance rolling, curved edges and hammer arch processing, good arc welding and contact welding performance, gas welding with small thickness, shape requires strict or complex shape parts is prone to cracks. Machinability drawn or normalizing state is better than the annealed condition, generally used for manufacturing with low discontinuity and high toughness requirements.
● Chemical Composition: C: 0.17 ~ 0.24 Si: 0.17 ~ 0.37 Mn: 0.35 ~ 0.65 S: ≤0.035 P: ≤0.035 chromium Cr: ≤0.25 Ni: ≤0.25 Cu: ≤0.25.
● Mechanical Properties: Tensile strength σb (MPa): ≥410 (42) yield strength σs (MPa): ≥245 (25) Elongation δ5 (%): ≥25 section shrinkage ψ(%): ≥5, hardness: no heat, ≤156HB, sample size: Sample size 25mm
● Heat treatment and microstructure specifications: Heat treatment specifications: normalizing, 910 ℃, air cooling. Microstructure: ferrite and pearlite.
● Delivery status: no heat treatment or heat treatment (annealing, normalizing or tempering) state delivery. Require heat treatment delivery should be specified in the contract, not indicated by not heat treatment delivery.