A691 5CR alloy pipe is a chromium-molybdenum alloy steel welded steel pipe designed for high temperature and high pressure environment.
Mechanical properties and process requirements
| Items | Parameter |
|---|---|
| Tensile Strength | ≥585 MPa |
| Yield Strength | ≥415 MPa |
| Elongation | ≥20% |
| Heat treatment status | CL22 Grade (Normalized + Tempered) |
| Manufacturing process | Electric fusion welding (EFW) or submerged arc welding (SAW), double-sided penetration weld |
| Toughness requirements | Meet -29℃ low temperature impact toughness |
Key application areas
- Energy and power:
Supercritical thermal power unit main steam pipeline;
Boiler heating surface high temperature components (≤538℃ working conditions).
- Petrochemical industry:
Hydrogenation reactor outlet pipeline (sulfur corrosion resistance);
High temperature cracking unit, oil and gas transmission high pressure pipeline.
- Nuclear power industry:
Nuclear power plant auxiliary system pipeline (must pass strict certification).
Quality assurance points
Nondestructive testing: 100% weld radiographic (RT) or ultrasonic (UT) testing;
Special certification: Sulfur-containing environment must comply with the NACE MR0175 sulfide stress corrosion resistance standard;
Standard compliance: Strictly follow the ASTM A691 specification production.
