API 5L X60 (L415) LSAW Steel Pipe: Manufacturing Capabilities & Product Specifications

Why Womic Steel for X60 LSAW?

● Three complementary processes (JCOE, UOE, rolled plate) covering diameters 219–1,600mm

● UOE process delivers ±0.2% OD roundness – critical for automated field welding of gas trunk lines

● Thick wall capability up to 70mm (single seam) or 80mm (double seam)

● PWHT furnace capacity: 12m length × 3m diameter

● Low-temperature impact testing down to -46°C and -60°C (arctic grade X60)

● Sour service certified with HIC/SSC testing (NACE TM0284, TM0177)

● API 5L Monogram + CE + third-party inspection (SGS, BV, TÜV, DNV, ABS, LR)

● Quick turnaround: 35-50 days for standard X60 PSL1, 50-70 days for PSL2 sour service

● Long length up to 24m reduces field girth welds by 30-40%

● Over 1,500 km of X60 pipelines supplied globally with zero in-service failure

Frequently Asked Questions:

Q: Why choose X60 over X52 for a gas pipeline?
A: X60 offers 15% higher yield strength (415 MPa vs 360 MPa), allowing for thinner walls (typically 10-15% reduction) for the same pressure rating. This reduces material weight and cost, especially for long-distance pipelines. However, X60 requires stricter welding procedures and is more sensitive to hydrogen cracking. For pressures below 10 MPa, X52 is often more economical. For pressures above 12 MPa, X60 or X65 is recommended.

Q: What is the difference between X60 PSL1 and PSL2?
A: PSL2 has stricter chemical limits (especially lower C, P, S), mandatory Charpy impact testing (27J @ 0°C or lower), maximum hardness 90 HRB, and requires 100% UT of the weld seam (PSL1 only requires spot UT). For gas trunk lines operating in populated areas or low temperatures, PSL2 is often specified.

Q: Can you supply X60 with sour service certification?
A: Yes. We supply X60 PSL2 with HIC testing (NACE TM0284) and SSC testing (NACE TM0177). Typical acceptance: CLR ≤ 5%, CTR ≤ 1.5%, CSR ≤ 0.5% for HIC. PWHT is applied for all sour service X60 regardless of wall thickness to ensure hardness ≤ 85 HRB. We have supplied sour service X60 to Middle East and Southeast Asia projects.

Q: What low-temperature impact testing can you perform for X60 arctic pipelines?
A: We can test down to -60°C. Typical arctic gas pipelines require Charpy impact of 27J minimum at -46°C. Womic typically achieves 80-120J at -46°C. For fracture propagation control, we also perform DWTT at -20°C with minimum 85% shear area. Please specify your required test temperature and energy.

Q: Which process is best for X60 offshore pipelines – JCOE or UOE?
A: UOE is preferred for offshore because it produces better roundness (±0.2% vs ±0.5% for JCOE) and lower residual stress. This is critical for withstanding external hydrostatic pressure (collapse) and for reliable field girth welding on lay vessels. UOE also provides better fatigue performance for dynamic risers. For shallow water (< 100m) onshore near-shore, JCOE is acceptable.

Q: What is the typical lead time for X60 LSAW pipe?
A: Standard lead time for X60 PSL1: 35-50 days. For X60 PSL2 with sour service testing and PWHT: 50-70 days. Rush orders (25-35 days) possible for small quantities (< 1,000 tons) if plate is in stock. For very large orders (> 20,000 tons), lead time may extend to 90 days.

Q: Do you provide third-party inspection for X60 LSAW pipes?
A: Yes. We work with SGS, BV, TÜV, DNV, ABS, and LR. Inspection can be performed at our factory during production, witnessed by client's representative. We issue EN 10204 Type 3.2 certificates upon request.

Project Reference – Southeast Asia Cross-Border Natural Gas Trunk Line

Country: Myanmar – Thailand border region (gas pipeline from Gulf of Martaban to Thailand)
Standard & Grade: API 5L X60 PSL2 (sour service, with HIC and SSC testing)
Dimensions & Quantity:

● OD 813mm (32″) × WT 19.0mm – 36,000 meters (approx. 12,600 tons) manufactured by UOE process

● OD 813mm (32″) × WT 22.0mm – 8,000 meters (approx. 3,200 tons) manufactured by UOE process (thicker wall for road/rail crossings)

● OD 610mm (24″) × WT 15.9mm – 12,000 meters (approx. 2,400 tons) manufactured by JCOE process (branch line to power plant)
Total: 56,000 meters (56 km), approx. 18,200 tons

Specifications: External 3LPE coating (3.0mm total thickness) per ISO 21809, beveled ends 30° / 1.6mm root face with internal bevel protector, hydrotest at 15.0 MPa (design pressure 11.5 MPa). Mandatory Charpy impact at 0°C and -20°C (min 27J, achieved 90-140J). HIC per NACE TM0284 Solution A, 96h – acceptance: CLR ≤ 5%, CTR ≤ 1.5%, CSR ≤ 0.5%. SSC per NACE TM0177 Method A, 720h – no cracking allowed. PWHT applied for all pipes with WT ≥ 19.0mm. 100% automated UT with TOFD for weld seam. Radiographic testing (RT) for field weld qualification samples.

Application: Cross-border natural gas trunk line transporting gas from offshore fields in the Gulf of Martakan (Myanmar) to an onshore receiving terminal in Thailand, then onward to a gas-fired power plant. The 56 km onshore section crosses mountainous jungle terrain with significant elevation changes (up to 400m), plus six major road crossings and three rail crossings.

Technical Challenges & Solutions:

● Sour service compliance for gas with trace H₂S – The natural gas contains 5-10 ppm H₂S at 55°C operating temperature. Womic performed HIC and SSC testing on 12 production lots. All passed with CLR 0%, CTR 0%, CSR 0% for HIC. SSC testing (NACE TM0177, 720h) showed no surface cracking. We achieved this by maintaining CEV ≤ 0.38%, applying PWHT for all 19.0mm and 22.0mm WT pipes (despite API 5L not requiring PWHT below 25.4mm), and controlling welding heat input to ≤ 2.8 kJ/mm. The client's inspector (BV) witnessed all testing and certified the results.

● Mountainous terrain with high longitudinal bending – The pipeline route includes slopes up to 25 degrees. Field bending of X60 pipes is more challenging than lower grades due to higher strength. Womic supplied pipes with extra-long single joints (18m instead of standard 12m) to reduce the number of field bends by 33%. We also provided a special bevel geometry (compound bevel) that allowed for ±3° misalignment during field welding without compromising weld quality. Ovality was held to ≤ 0.3% (UOE process) to ensure proper alignment on slopes.

● 3LPE coating integrity in jungle environment – High humidity (80-95% year-round) and abrasive laterite soil posed coating risks. Womic applied 3LPE coating with an additional 0.3mm sacrificial layer. We performed 100% holiday detection at 7kV (standard 5kV) and measured peel strength at 25°C and 70°C (230 N/cm at 25°C, 160 N/cm at 70°C). Coating passed cathodic disbondment test (≤ 8mm radius at 65°C, 28 days).

● Cross-border logistics with customs complexity – Pipes were shipped from Shanghai to Yangon port (Myanmar), then trucked 280 km to the pipeline spread near the Thai border. The route passes through two customs checkpoints. Womic prepared country-specific documentation (Certificate of Origin form AK, ASEAN-wide). We also arranged temporary import bonds to avoid duty payment delays. All 18,200 tons cleared customs within 5 days.

● Stringent weld heat input control for X60 – X60's HAZ is sensitive to excessive heat input, which can cause softening and reduce toughness. Womic used a dual-wire SAW system with heat input monitoring on every weld pass. Average heat input for inner weld: 2.2 kJ/mm, outer weld: 2.5 kJ/mm (well below the 3.5 kJ/mm limit). Interpass temperature was kept below 200°C. Cross-weld hardness after PWHT: base metal 78-82 HRB, weld 82-86 HRB, HAZ 80-84 HRB – all within the 90 HRB limit.

● Result: The gas pipeline was commissioned in Q3 2024. All 56 km of X60 PSL2 pipes passed third-party inspection by BV Myanmar. The client reported zero welding defects during field girth welding (over 4,600 girth welds). The pipeline has been operating at 10.5-11.0 MPa for 12 months with no leaks or coating failures. Womic Steel received a "Supplier of the Year" award from the Thai EPC contractor for on-time delivery (all 18,200 tons delivered within 68 days) and quality performance.

Contact:
Website: www.womicsteel.com
E-mail: sales@womicsteel.com

Tel / WhatsApp / WeChat:
Victor: +86 15575100681
Jack: +86 18390957568

Womic Steel – Your reliable partner for API 5L X60 LSAW pipes for high-pressure natural gas trunk lines, offshore pipelines, sour service, and arctic applications worldwide.