Skelp & Plate for API 5L Line Pipe Manufacturing
These plates are specifically produced for the fabrication of large-diameter longitudinal seam-welded (LSAW) and spiral-welded (SSAW) line pipe. They meet the chemistry, mechanical property, and testing requirements of API 5L for oil and gas transmission pipelines.
Available Standards & Grades
Standard Grades
API 5L Grade B, X42, X46, X52, X56, X60, X65, X70, X80 (PSL1 and PSL2)
ISO 3183 L245, L290, L360, L390, L415, L450, L485, L555
API 2H Grade 50 (offshore structural tubular joints)
API 2W Grade 50, Grade 60 (TMCP offshore structural)
Key Properties
- Requirement Detail
- Chemistry Control Tight control on CEV and PCM (weldability parameters). Sulfur and phosphorus limits per PSL2
- Tensile Properties Yield, tensile, and elongation verified per API 5L Table 7
- Charpy Testing Transverse Charpy at specified test temperature (typically 0°C to -46°C)
- DWT (Drop Weight Tear Test) For propagation control in gas pipelines. Required for X65+ grades
- Sour Service (Annex H) HIC (NACE TM0284) and SSC (NACE MR0175) testing for sour gas service
- HIC Testing CLR ≤ 15%, CTR ≤ 5%, CSR ≤ 2% (typical project requirements)
Typical Plate Dimensions for Pipe Manufacturing
Parameter Range
Thickness 6mm to 50mm
Width 1500mm to 4680mm (suited to common pipe ODs)
Length Up to 18000mm
Condition Normalized, TMCP, Q&T (per grade requirement)
Typical Applications
· LSAW (Longitudinal Submerged Arc Welded) line pipe feedstock
· SSAW (Spiral Submerged Arc Welded) skelp
· Hot induction bend mother pipe
· Flanges, tees, and fabricated fittings from plate
· Pig launchers and receivers
· Flowline and gathering line pipe