The material of 20# seamless steel tube is 20# steel, the strength is slightly higher than that of 15 steel, with little quenching and no tempering brittleness. Cold deformation has high plasticity and is generally used for bending, rolling, edge bending and hammer arch processing. The welding performance of 20# seamless steel tube arc welding and contact welding is good.
When gas welding, the thickness is small, and the parts with strict shape requirements or complex shape are easy to crack. 20# seamless steel tube is better in cutting and cold drawing or normalizing state than in annealing state, which is generally used for manufacturing with low stress and high toughness requirements.
Chemical composition of 20# seamless steel tube:
C:0.17~0.24 Si:0.17~0.37 Mn:0.35~0.65 S:≤0.035 P:≤ 0.035 Cr:≤0.25 Ni:≤0.25 Cu:≤0.25
Mechanical properties of 20# seamless steel tube:
Mechanical properties: tensile strength σ B (MPA) ≥ 410 (42), yield strength σ s (MPA) ≥ 245 (25), elongation δ 5 (%) ≥ 25, area shrinkage ψ (%) ≥ 50, hardness: not heat treated ≤ 156hb, sample size: sample size 25mm.
