Comprehensive analysis of S355K2 seamless steel tube

1、S355K2 seamless steel tube Basic Information

International standard: EN 10210-1 (European standard hot-rolled structural steel pipes)

2、 S355K2 seamless steel tube Core performance parameters

Mechanical performance

Yield strength: ≥ 355 MPa (wall thickness ≤ 16mm)

Tensile strength: 470-630 MPa

Low temperature impact toughness: Impact energy ≥ 27J at -40 ℃ (longitudinal specimen)

Elongation rate (A5): ≥ 22% 35

Chemical composition (typical values)

Carbon (C): ≤ 0.22%, Manganese (Mn): ≤ 1.60% 45

Phosphorus (P)/sulfur (S): ≤ 0.035% (strictly limit inclusions)

Silicon (Si): ≤ 0.55% (optimized cold working performance)

3、 S355K2 seamless steel tube Production process and testing

Forming process: Hot rolling/cold drawing is the main method, with an outer diameter accuracy of ± 0.1mm (suitable for high-precision mechanical components).

Heat treatment: Normalization treatment improves uniformity, and some suppliers provide quenching and tempering services (delivery status needs to be clarified).

Non destructive testing: Ultrasonic testing (UT) ensures that there are no cracks or pores inside.

4、 S355K2 seamless steel tube Typical application areas

Energy equipment: boiler pipelines in thermal power plants, wind turbine tower connections (resistant to high pressure and low temperature).

Petrochemical industry: natural gas transmission pipelines, pressure bearing components of refining equipment (requiring anti-corrosion coatings).

Heavy machinery: hydraulic cylinder barrel, mining machinery transmission shaft (high tensile strength and wear resistance).

5、 Precautions

Standard update: Confirm that the project is applicable to EN 10210:2017 or the latest version.