Core analysis of ASME SA213 T12 seamless steel tube

1、 Material characteristics and standard specifications

Chemical composition

Containing chromium (Cr: 1.00-1.50%), molybdenum (Mo: 0.44-0.65%), carbon content ≤ 0.15%, strict control of sulfur and phosphorus impurities (S ≤ 0.01%, P ≤ 0.02%), ensuring high temperature oxidation resistance and creep resistance.

Compliant with ASME SA-213M standard, suitable for high-pressure and high-temperature equipment such as boilers and superheaters.

High temperature performance

Short term temperature resistance up to 580 ℃, long-term use temperature ≤ 450 ℃, tensile strength ≥ 415MPa, yield strength ≥ 220MPa, elongation ≥ 30% 67.

2、 Application Fields and Structural Design

Core application scenarios

Power industry: used for high-pressure boiler water-cooled walls and superheater tube banks, capable of withstanding high temperature steam above 450 ℃.

Petrochemical industry: hydrogenation reactors, high-temperature heat exchangers, and oil and gas pipelines with excellent corrosion resistance.

Mechanical manufacturing: High strength wear-resistant components (such as drill bits, turning tools) and internally threaded heat transfer tubes.

Internal thread optimization design

Internal surface spiral ribs enhance fluid turbulence and improve heat transfer efficiency (such as 31.8 × 5.5mm specification).

Suitable for small-diameter pipes (diameter ≤ 60mm), the cold drawing process ensures high precision and smoothness.

3、 Manufacturing process and market supply

Production process

Hot rolling process is used for large-diameter/thick walled pipes (such as φ 273 × 7mm), while cold drawing process is suitable for high-precision thin-walled pipes.

Surface treatment (galvanizing, coating) enhances corrosion resistance and supports customized lengths (such as 12 meters to length).

4、 Comparison and differentiation advantages

Compared with SA213 T91

The Cr content of T12 is relatively low (1.00-1.50% vs. 8.0-9.5%), with a slightly lower upper temperature resistance limit (450 ℃ vs. 650 ℃), but the cost is lower, making it suitable for medium to high temperature scenarios.

Comparison with ASTM A335 P12

The chemical composition of the two is similar, but T12 is mainly used in seamless process, while P12 is mostly used for welding pipelines.