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Seamless Steel Tube

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Seamless steel pipes for pipelines
Standard:
API SPEC 5L - American Petroleum Institute Standard
GB/T9711.2- Chinese Standard
Purpose: Used for oxygen, water, and oil pipelines in the petroleum and natural gas industries
Main steel pipe grades: B, X42, X52, X60, X65, X70 Dimensional tolerance:
Steel pipe type Outer diameter of steel pipe(D) Steel pipe wall thickness(S)
Tube body Outer diameter of steel pipe (mm) Allowable deviation(mm) Outer diameter of steel pipe (mm) Allowable deviation(mm)
≥60.3 & S<20 ±0.75% ≤73.0 +15%,-12.5%
≥60.3 & S≥20 ±1.00% >73.0且S<20 +15%,-12.5%


>73.0且S≥20 +17.5%,-10
Mechanical:
Standard Name of shop Tensile strength
(MPa)
Yield strength
(MPa)
Yield ratio Elongation
(%)
0℃ Impact energy
Akv(J)
Heat treatment status
API SPEC 5L
GB/T9711.2
B ≥415 245~440 ≤0.80 22 ≥40 Normalizing
X42 ≥415 290~440 ≤0.80 21 ≥40 Normalizing
X52 ≥460 360~510 ≤0.85 20 ≥40 Normalizing
X60 ≥520 415~565 ≤0.85 18 ≥40 Normalizing
X65 ≥535 450~570 ≤0.90 18 ≥40 Quenching+tempering
X70 ≥570 485~605 ≤0.90 18 ≥40 Quenching+tempering
Chemical composition:
Standard Name of shop Chemical composition(%) CEV(%)
C Si Mn P S V Nb Ti
API SPEC 5L
GB/T9711.2
B ≤0.16 ≤0.40 ≤1.10 ≤0.020 ≤0.010 ≤0.42
X42 ≤0.17 ≤0.40 ≤1.20 ≤0.020 ≤0.010 ≤0.05 ≤0.05 ≤0.04 ≤0.42
X52 ≤0.20 ≤0.45 ≤1.60 ≤0.020 ≤0.010 ≤0.10 ≤0.05 ≤0.04 ≤0.45
X60 ≤0.21 ≤0.45 ≤1.60 ≤0.020 ≤0.010 ≤0.15 ≤0.05 ≤0.04 协议
X65 ≤0.16 ≤0.45 ≤1.60 ≤0.020 ≤0.010 ≤0.06 ≤0.05 ≤0.06 ≤0.45
X70 ≤0.16 ≤0.45 ≤1.70 ≤0.020 ≤0.010 ≤0.06 ≤0.05 ≤0.06 ≤0.45
Notices:
1.0.015%≤Altot<0.06%;N≤0.012%;Al/N≥2/1;Cu≤0.25%;Ni≤0.30%;Cr≤0.30%;Mo≤0.10%
2.V+Nb+Ti≤0.15
3.X60、X65、X70 After negotiation Mo≤0.35%