CK60 seamless tube
Chemical composition and mechanical properties of ck60 seamless pipe
Carbon (c): 0.57 ～ 0.65
Silicon (SI): 0.17 ～ 0.37
Manganese (MN): 0.50 ～ 0.80
Sulfur s: ≤ 0.035
Phosphorus P: ≤ 0.035
Chromium Cr: ≤ 0.25
Nickel Ni: ≤ 0.25
Copper Cu: ≤ 0.25
● mechanical properties:
Tensile strength σ b （MPa）：≥675（69）
yield strength σ s （MPa）：≥400（41）
Elongation δ 5 （%）：≥12
Reduction of area ψ （%）：≥35
Hardness: not heat treated ≤ 255hb; Annealed steel ≤ 229hb
Sample size: sample size is 25mm ● heat treatment specification and metallographic structure:
Heat treatment specification: normalized, 810 ℃. ● delivery status: the product is delivered without heat treatment or heat treatment (annealing, normalizing or high temperature tempering).