Chemical Composition and Mechanical Properties of CK60 Seamless Steel Pipe

Hit：192026-02-24 10:55:58　

Chemical Composition and Mechanical Properties of CK60 Seamless Steel Pipe
mechanical properties
The mechanical properties of CK60 seamless steel pipes vary significantly depending on the heat treatment state, with common delivery conditions including normalization, annealing, or quenching plus tempering. The performance indicators are as follows:
Performance Indicators  
Unheat-treated or normalized condition  
Quenched and tempered condition (applicable to thin-walled tubes)
Tensile strength (σb) ≥ 675 MPa 1180 ~ 1680 MPa (t ≤ 2mm)
Yield strength (σs) ≥ 400 MPa (not specified, typically above 400 MPa)
Elongation (δ5) ≥ 12% ≥ 35% (quenched and tempered condition)
The reduction of area (ψ) ≥ 35% (unspecified)
Hardness ≤ 255 HB (unheat-treated)
≤ 229 HB (annealed) HV ≤ 185
The chemical composition of CK60 seamless steel pipe is primarily composed of carbon, manganese, and silicon, with strict control over the content of harmful elements such as sulfur and phosphorus. The specific ranges are as follows:
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%
CK60 seamless steel pipe is a high-strength carbon structural steel, with its chemical composition and mechanical properties primarily standardized according to German standards (DIN 1629) and internationally recognized grades (such as No. 60 steel in GB/T 699-1999, JIS S58C, and AISI 1060). The above are its key parameters.