API 5L X70 Grade Longitudinally Submerged Arc Welded
Product introduction
X70 grade strength allows for higher transmission pressures, improving gas transmission efficiency, or reducing wall thickness at the same pressure, saving materials and costs. X70 grade steel pipes possess excellent low-temperature impact toughness, effectively preventing long-range ductile fracture in accidental events (such as third-party damage), and have good crack arrest capabilities. Furthermore, they exhibit good corrosion resistance; by adding elements such as Cu, Ni, and Cr, or by combining external anti-corrosion coatings (such as 3PE) and internal coatings, they effectively resist corrosion from soil and the transported media.
Mechanical properties
| Performance Specifications | Requirements (Typical Values) | Remarks |
|---|---|---|
| Yield Strength | ≥ 483 MPa (70,000 psi) | Core specification, ensuring the pipeline's pressure-bearing capacity. |
| Tensile Strength | ≥ 565 MPa (82,000 psi) | Ensures the overall strength of the pipeline. |
| Yield-to-Strength Ratio | ≤ 0.93 | A high yield-to-strength ratio is characteristic of pipeline steel, but standards set an upper limit to ensure a safety margin. |
| Elongation | ≥ 20% | Ensures the steel pipe has a certain degree of plastic deformation capacity. |
| Impact Toughness | Strict requirements (usually -10℃ or -20℃ or even lower) | Core specification, prevents brittle fracture of the pipeline and provides crack arrest capability. |
Dimensioning and Shape Inspection
Accurate geometric dimensions are a prerequisite for ensuring pipeline construction efficiency and operational safety, especially in the era of automated welding. This inspection uses precision measuring tools such as laser diameter gauges, ultrasonic thickness gauges, calipers, and ring gauges to measure the outer diameter, wall thickness, ovality, and straightness (chord height) of the steel pipe along its entire length. Strict control of the outer diameter and ovality ensures the accuracy of on-site assembly and reduces welding stress; the uniformity of wall thickness directly affects pressure-bearing capacity; and excellent straightness is crucial for the efficiency and aesthetics of pipeline laying, especially for pipelines traversing complex terrain. API standards have extremely strict tolerances for these dimensions; any deviation from these tolerances may result in the rejection of the steel pipe.
About us
GNEE STEEL Group has 18 years of experience in steel export. We are committed to providing customers with high-quality steel products to meet the needs of any project, and we can also provide professional solutions.
Hot Tags: api 5l x70 grade longitudinally submerged arc welded, China api 5l x70 grade longitudinally submerged arc welded manufacturers, suppliers, API 5L PSL2, ASTM A691 1 1 4CR Alloy Steel EFW Pipe, ASTM A691 1 1 4CR Welded Pipe, Low alloy steel pipes, P12 Alloy Steel Pipe, straight seam electric welded steel pipe
You Might Also Like
Send Inquiry