Hot-rolled steel pipes are delivered in hot-rolled or heat-treated condition;

Hot rolled seamless steel pipe production process:

Tube blank → heating → perforation → three-high skew rolling and continuous rolling → Stripping → sizing → Cooling → straightening → hydraulic test → marking → lever effect seamless steel pipe in storage will be detected.

Cold-drawn seamless steel pipe production process:

Tube blank → heating → perforating → heading → annealing → pickling → oiling → multi-pass cold drawing → Tube blank → Heat treatment → straightening → hydraulic test → marking → storage. The wall thickness of cold-drawn seamless steel pipe is better than that of hot-rolled seamless steel pipe, and the surface roughness is also some.

Product information:

1020 is a high-quality carbon structural steel, the steel strength is slightly higher than 1015 steel

Chemical composition:

C: 0.18~0.23%, Si: 0.10~0.40%, Mn: 0.30~0.60%, P: ≤0.040%, S: ≤0.050%

Mechanical properties:

Density ρ (kg/m3) : about 7850    ——    Tensile strength σb(MPa) : ≥410    ——    Yield strength σs(MPa) : ≥245    ——    Elongation δ5(%) : ≥25    ——    Section shrinkage ratio ψ(%) : ≥55    ——    Brinell hardness (HBS10/3000) (not heat treated) : ≦156

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1040 high-quality carbon structural steel, material name: high-quality carbon structural steel

Brand number :1040, corresponding to domestic brand number :25CrNiMo

Chemical composition (%) : 

C :0.37~0.44, Si:0.17~0.37, Mn:0.60~0.90, S :≤0.050, P :≤0.040, Cr:≤0.25, Ni:≤0.25, Cu:≤0.25

Mechanical properties:Tensile strength σb (MPa):≥570(58)     ——     Yield strength σs (MPa):≥335(34)    ——    Elongation δ5 (%):≥19    ——    Section shrinkage (%):≥45    ——    Impact power Akv (J):≥47    ——    Impact toughness value αkv (J/cm2):≥59(6)

Hardness: no heat treatment, ≤217HB; Annealed steel ≤187HB 

* (Sample size: 25mm)

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SAE1045 high quality carbon structural steel medium carbon steel

Implementation standard: ASTM A29/A29M-04

Chemical composition (%) : 

C :0.43~0.50, Si:0.17~0.37, Mn:0.60~0.90, S :≤0.050, P :≤0.040, Cr:≤0.25, Ni:≤0.25, Cu:≤0.25

Mechanical properties:

Tensile strength σb (MPa):≥600(61)    ——    Yield strength σs (MPa):≥355(36)    ——    Elongation δ5 (%):≥16    ——    Section shrinkage ratio ψ (%):≥40    ——    Impact power Akv (J):≥39    ——    Impact toughness value αkv (J/cm2):≥49(5)

Hardness: no heat treatment,≤229HB; Annealed steel,≤197HB

* (Sample size: 25mm)