Core analysis of ASME SA213 T22 seamless steel tube

1、 Material characteristics and chemical composition

Chemical composition:

Core elements: chromium (Cr: 2.25%), molybdenum (Mo: 1.0%), carbon content ≤ 0.15%, sulfur (S ≤ 0.01%) and phosphorus (P ≤ 0.02%) are strictly controlled to ensure high temperature oxidation resistance and creep resistance.

Alloy characteristics: It belongs to 2.25Cr-1Mo chromium molybdenum high-temperature ferritic steel, which has both high strength and corrosion resistance.

High temperature performance:

Short term temperature resistance up to 580 ℃, long-term use temperature ≤ 550 ℃, tensile strength ≥ 415MPa, yield strength ≥ 205MPa, elongation ≥ 30%.

At the same temperature, its creep fracture strength and allowable stress are even higher than some 9Cr steels (such as T91).

2、 Application Fields

Power industry:

Superheaters, reheaters, and high-temperature flue gas pipelines used in supercritical boilers can withstand steam environments above 550 ℃.

Used for high-temperature heating pipelines in thermal and nuclear power equipment to ensure stable operation of the equipment.

Petrochemical industry:

Applied to hydrogenation reactors, high-temperature and high-pressure pipelines, and heat exchangers, suitable for corrosive media and high-pressure environments.

Aerospace:

Manufacturing high-temperature components such as gas turbine combustion chambers and turbine blades to meet extreme environmental performance requirements.

3、 Manufacturing process and standards

Production process:

Adopting seamless cold drawing or hot rolling process, with high surface smoothness and uniform wall thickness (common specifications such as φ 273 × 7mm).

Support internal thread design (such as 31.8 × 5.5mm specification) to improve fluid turbulence and heat transfer efficiency.

Certification standards:

Compliant with ASME SA-213/SA-213M-2021 standards, compatible with national standard GB5310 (20G), meeting global project procurement needs.

4、 Comparison and advantages

Compared to SA213 T91:

The Cr content of T22 (2.25%) is lower than that of T91 (9Cr), but its thermal strength performance is better (≤ 580 ℃), and its weldability and processability are better.

Compared to T12:

T22 has higher Cr and Mo content, with an upper temperature resistance limit of 550 ℃, making it suitable for higher temperature scenarios.

Summary

ASME SA213 T22 seamless steel pipe performs excellently in high temperature, high pressure, and corrosive environments with its 2.25Cr-1Mo alloy formula and seamless process. Its wide application covers fields such as electricity, petrochemicals, aerospace, etc., and its strict standard certification (ASME/GB5310) and flexible market supply (such as customized cutting) meet diverse engineering needs.