Seamless steel pipes for pipelines
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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 |
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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% |