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Standard Specification for Grade X70-PSL1
| Grade | Grade X70-PSL1 |
| Standard | API 5L-2018 |
| Specification for Line Pipe | |
| Classification | Alloy Steel |
| Introductions | Scope: This specification specifies the manufacturing requirements for two product specification classes (PSL 1 and PSL 2) of seamless and welded steel pipes for pipeline transportation systems in the oil and gas industry. – This specification does not apply to cast pipes. |
| Grade X70-PSL1 Chemical Element Content (%) | |||||||||||
| Name | Constituent | C * | Mn * | P | S | Cr | Ni | Cu | Mo | B | More |
| Seamless pipe | Min | – | – | – | – | – | – | – | – | – | Nb+V+Ti≤0.15* |
| Max | 0.28 | 1.4 | 0.03 | 0.03 | 0.5 | 0.5 | 0.5 | 0.15 | 0.001 | ||
| Name | Constituent | C * | Mn * | P | S | Cr | Ni | Cu | Mo | B | More |
| Welded pipe | Min | – | – | – | – | – | – | – | – | – | Nb+V+Ti≤0.15* |
| Max | 0.26 | 1.65 | 0.03 | 0.03 | 0.5 | 0.5 | 0.5 | 0.15 | 0.001 | ||
| ① For the product (steel pipe) Grade PSL1: the specified maximum content of carbon is reduced by 0.01%, the specified maximum content of Mn can be increased by 0.05%, and for steel Grade ≥L245 or Grade B and ≤L360 or Grade X52, the Mn content can be increased to 1.65%; For steel grades > L360 or Grade X52 and < L485 or Grade X70, the Mn content can be increased to up to 1.75 %; For steel Grade L485 or Grade X70, Mn content can be increased up to 2.00%. (2) For the product (steel pipe) Grade PSL2: the specified maximum content of carbon is reduced by 0.01%, the specified maximum content of Mn can be increased by 0.05%, and for steel Grade ≥L245 or Grade B and ≤L360 or Grade X52, the Mn content can be increased to 1.65%; For steel grades > L360 or Grade X52 and < L485 or Grade X70, the Mn content can be increased to up to 1.75 %; For steel grades ≥L485 or Grade X70 and ≤L555 or Grade X80, Mn content can be increased to up to 2.00%; For steel Grade > L555 or Grade X80, Mn content can be up to 2.2%. * Unless otherwise agreed. |
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| Grade X70-PSL1 Mechanical properties | |||
| Condition | Tensile Strength | Yield stress | Elongation |
| σb | σs | δ | |
| Mpa | Mpa | % | |
| Seamless&welded pipe | ≥570 | ≥485 | * |
| * Calculation formula of minimum elongation: δ=C×(A<sup>0.2</sup>/U<sup>0.9</sup>) Where: C=1940(metric); C= 625,000 (US system) A= The following applicable tensile specimen area dimensions: ⓐ For round rod samples: the diameter of the samples was 12.7(0.5in.) and 8.9(0.35in.)mm, and the cross-sectional areas of the samples were both 130mm<sup>2</sup>(0.2in.<sup>2</sup>). Diameter of 6.4 mm (0.25 in.) sample, sample cross section area of 65 mm < sup > 2 < / sup > (0.1 in. < sup > 2 < / sup >) For the whole sample: 485mm<sup>2</sup>(0.75in.<sup>2</sup>) and the smaller of the cross-sectional area calculated according to the outer diameter and wall thickness specified for the whole tube sample. The digit is accurate to 10mm<sup>2</sup>(0.01in.<sup>2</sup>). ⓒ For the strip specimen: 485mm<sup>2</sup>(0.75in.<sup>2</sup>) and the smaller of the cross-sectional area calculated according to the specified width and wall thickness of the specimen. The digit is accurate to 10mm<sup>2</sup>(0.01in.<sup>2</sup>). ⓓU= specified minimum ultimate tensile strength in MPa(psi) |
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