The material of 20# seamless steel pipe is: high quality carbon structural steel brand: 20# seamless steel pipe standard: GB/T 699-198820 characteristics and application scope: the strength is slightly higher than that of 15 steel, little quenching, no tempering brittleness.
20# seamless steel pipe chemical composition: 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.
20# seamless steel pipe mechanical properties: tensile strength σ B (MPa): ≥ 410 (42), yield strength σ s (MPa): ≥ 245 (25), elongation δ 5 (%): ≥ 25, area shrinkage ψ (%): ≥ 5, hardness: not heat treated ≤ 156HB, 20# seamless steel pipe sample size: sample size 25mm.
20# seamless steel pipe heat treatment specification and metallographic structure: heat treatment specification: normalizing, 910℃, air cooling. Metallographic structure: ferrite + pearlite.
