API 5L X42 SSAW Steel Pipe

API 5L X42 SSAW steel pipe is a high-performance line pipe designed for the transportation of oil, natural gas, and other fluids in onshore and offshore pipeline systems. This product combines the cost-effectiveness of spiral welding technology with the reliable mechanical properties of Grade X42 (also known as L290 per ISO 3183). It serves as a critical component in low-to-medium pressure transmission networks, offering an optimal balance between strength, durability, and economic efficiency.

1. Standard & Grade

‌Standard:‌ API Spec 5L / ISO 3183

‌Grade:‌ X42 / L290

‌Product Specification Level (PSL):‌ Available in PSL1 and PSL2. PSL2 offers stricter requirements for chemical composition, mechanical properties, and non-destructive testing.

2. Mechanical Properties

‌Minimum Yield Strength:‌ 290 MPa (42,100 Psi)

‌Tensile Strength:‌ 415 MPa (60,200 Psi) minimum

‌Elongation:‌ Minimum 21%

‌Impact Resistance:‌ Excellent toughness, suitable for various environmental conditions.

3. Chemical Composition (Typical Max %)

‌Carbon (C):‌ ≤ 0.28%

‌Manganese (Mn):‌ ≤ 1.30%

‌Phosphorus (P):‌ ≤ 0.030%

‌Sulfur (S):‌ ≤ 0.030%

‌Micro-alloys:‌ Nb+V ≤ 0.06%; V+Nb+Ti ≤ 0.15%

Note: Carbon Equivalent (CEQ) is controlled to ensure weldability.

The Spiral Submerged Arc Welding (SSAW) process involves forming steel coils into a spiral shape and welding the seam using submerged arc welding techniques. Key steps include:

‌Uncoiling & Leveling:‌ Steel coils are unrolled, leveled, and milled on both edges to ensure precise groove geometry.

‌Forming:‌ The strip is continuously formed into a spiral tube shape.

‌Welding:‌ Internal and external submerged arc welding is performed simultaneously to ensure deep penetration and high-quality weld seams.

‌Cutting & Testing:‌ Pipes are cut to specified lengths and undergo rigorous hydrostatic testing, ultrasonic inspection, and X-ray examination.

To enhance corrosion resistance and extend service life, the pipes can be supplied with various surface treatments:

‌Black Varnish/Oil:‌ For temporary protection during storage and transport.

‌3LPE (Three-Layer Polyethylene):‌ Superior corrosion protection for buried pipelines.

‌FBE (Fusion Bonded Epoxy):‌ Ideal for high-temperature applications.

‌Custom Coatings:‌ Available upon request for specific environmental conditions (e.g., sour service/NACE MR-0175 compliance)

API 5L X42 SSAW pipes are widely used in:

‌Oil & Gas Transmission:‌ Long-distance pipelines for crude oil, refined products, and natural gas.

‌Water Transport:‌ Large-diameter water supply and drainage systems.

‌Structural Uses:‌ Piling, scaffolding, and structural supports in construction.

‌Low-Pressure Fluid Delivery:‌ Industrial fluid transport systems.

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