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
- Cold Rolling: Reduce thickness to 0.18–0.30 mm with 85–92% deformation.
- Decarburization: Anneal at 830–850°C in wet H₂/N₂ atmosphere (C ≤0.003%).
- Coating: Apply MgO insulation layer (3–5 μm) for interlaminar resistance >20 Ω·cm².
- 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.
