Alloy Steel

The most commonly used grades include 2Cr12NiMo1W1V, 12Cr1MoV, P91 (9Cr1MoVNb), P92, 20Cr1Mo1VTiB, and 1Cr11Ni2W2MoV. These steels provide high creep strength, heat resistance, and long service life under high-temperature and high-pressure conditions.

Selection depends on temperature, pressure, corrosion environment, and mechanical load. For temperatures above 600°C, P91, P92, and 2Cr12NiMo1W1V are preferred. For chemical resistance, Cr-Ni-Mo steels like 1Cr18Ni9 or 25Cr2MoVA are suitable.

Major standards include GB, ASTM, ASME, DIN, EN, and JIS. For example:
- 2Cr12NiMo1W1V (GB) ≈ ASTM 617 / P91
- 12Cr1MoV (GB) ≈ ASTM A335 P11
- 25Cr2MoVA (GB) ≈ DIN 1.7335

Yes, alloy steel is available in seamless, ERW (Electric Resistance Welded), hot-rolled, and cold-drawn forms. The choice depends on pipe diameter, wall thickness, and application requirements.

Each grade has specific C, Cr, Mo, Ni, V, W contents, affecting tensile strength, hardness, creep, and fatigue resistance. For example:
- 2Cr12NiMo1W1V: 0.12%C, 12%Cr, 1%Mo, 1%Ni, 0.2%V, 1%W, 750–900 MPa tensile, 250–280 HB hardness.
- P91: 0.09%C, 9%Cr, 1%Mo, 0.07%V, 690–830 MPa tensile, 230–260 HB hardness.

Yes, we provide custom OD, wall thickness, length, and shape for alloy steel bars, tubes, and pipes. Both metric and imperial sizes can be supplied according to customer or project requirements.

Products are manufactured under ISO 9001 and API 5L certified processes, tested for tensile strength, hardness, impact, and non-destructive testing (UT, PT, RT). Third-party inspection and Mill Test Certificates (MTC) are provided.

Alloy steel is widely used in: boilers, superheaters, petrochemical pipelines, pressure vessels, heat exchangers, aerospace, nuclear, marine engineering, automotive, and heavy machinery.

Proper heat treatment, stress relief, corrosion protection, and regular inspections are crucial. Selecting the correct grade for the operating environment significantly reduces wear, creep, and fatigue.

Most alloy steels are weldable and machinable, but grades like high-chromium or high-vanadium steels may require preheating and controlled post-weld heat treatment to maintain mechanical properties.