Welded API 5L Line Pipe

‌Precision-Engineered ERW API 5L Line Pipes & CRGO Silicon Steel Solutions‌ ‌API 5L ERW Line Pipes: Rigorous Dimensional Compliance for Oil/Gas Transmission‌ Designed for high-pressure pipeline networks, our ERW API 5L pipes meet stringent OD and wall thickness tolerances across ‌219.1–610 mm (8"–24") diameters‌.

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Product Introduction

Precision-Engineered ERW API 5L Line Pipes & CRGO Silicon Steel Solutions.‌

‌API 5L ERW Line Pipes: Rigorous Dimensional Compliance for Oil/Gas Transmission.‌

Designed for high-pressure pipeline networks, our ERW API 5L pipes meet stringent OD and wall thickness tolerances across ‌219.1–610 mm (8″–24″) diameters‌.

‌Dimensional Tolerances‌

‌OD Range (mm)‌ ‌Pipe End Tolerance‌ ‌Pipe Body Tolerance‌
219.1–273.1 +1.6mm / -0.4mm ±0.75%
274–610 +2.4mm / -0.8mm ±0.75%

‌Wall Thickness Compliance‌

‌Grade‌ ‌OD Range (mm)‌ ‌Thickness Tolerance‌
API 5L Gr.A 219.1–457 +15% / -12.5%
API 5L Gr.B 508–610 +17.5% / -12.5%
API 5L X42–X80 508–610 +19.5% / -8%

‌Certifications‌:

  • API Monogram (5L/5CT)
  • ISO 3183:2019 for sour service (H₂S ≤20 ppm)

‌CRGO Silicon Steel: Energy-Efficient Transformer Core Material‌

Cold Rolled Grain Oriented (CRGO) Silicon Steel optimizes magnetic performance for power transformers, reducing core losses by ‌40–60%‌ compared to non-oriented steel.

‌Key Magnetic Properties‌

‌Parameter‌ ‌CRGO Silicon Steel‌ ‌Standard Non-Oriented Steel‌
Core Loss (W/kg @1.5T) 0.85–1.20 2.50–3.50
Permeability (μmax) 1,800–2,000 500–800
Saturation Induction (T) 1.92–2.03 1.60–1.80

‌Applications‌:

  • ‌Power Transformers‌: 0.23–0.30 mm thickness laminations for 50/60 Hz grids.
  • ‌High-Frequency Chokes‌: 0.10–0.15 mm ultra-thin strips (up to 1 kHz).

‌CRGO Manufacturing Process & Quality Control‌

  1. ‌Cold Rolling‌: Reduce thickness to 0.18–0.30 mm with 85–92% deformation.
  2. ‌Decarburization‌: Anneal at 830–850°C in wet H₂/N₂ atmosphere (C ≤0.003%).
  3. ‌Coating‌: Apply MgO insulation layer (3–5 μm) for interlaminar resistance >20 Ω·cm².
  4. ‌Stress Relief‌: Final annealing at 1,200°C to align Goss texture {110}<001>.

‌Testing Protocols‌:

  • Epstein Frame (IEC 60404-2) for core loss verification
  • Laser-scribed samples for magnetic domain refinement

‌Competitive Advantages‌

‌Product‌ ‌MOQ‌ ‌Lead Time‌ ‌Key Feature‌
‌API 5L ERW Pipes‌ 20 tons 25–40 days ±0.5% ovality control
‌CRGO Silicon Steel‌ 5 tons 30–60 days 0.18 mm tolerance: ±0.005 mm

Product Show

Supplier of various types of carbon steel

Luo Kaiwei Steel Company is a comprehensive steel supplier that produces a variety of carbon steel plates, carbon steel pipes, galvanized steel, carbon steel coils, and steel profiles.

Luo Kaiwei Steel Company is a multi-ISO certified steel manufacturer specializing in carbon steel plates, pipes and galvanized coils since 2010. Competitive prices and ASTM/JIS compliant. Get instant quotes for bulk orders and global shipping support.

Tel: +86 15635685959

E-mail: [email protected]  

WhatsApp: +86 18912200505

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