I. Execution Standards
International Standards
DIN 17100: German standard specifying the chemical composition, mechanical properties, and process requirements for ST52-3.
ASTM/API: Some ST52 steel pipes comply with U.S. standards (e.g., API 5L X52) for oil and gas pipelines.
Domestic Equivalent Grades
Q355 (replacing Q345): Similar to ST52-3 but with stricter control of phosphorus/sulfur and higher elongation.
II. Application Scope
Construction & Bridges
Steel frameworks, bridge supports requiring high strength (yield strength ≥355MPa) and toughness.
Mechanical Manufacturing
Crane booms, pressure vessels, hydraulic pillars, leveraging its tensile strength (490–650MPa) and weldability.
Petrochemical Industry
Oil/gas pipelines (e.g., API 5L X52), chemical equipment requiring pressure and corrosion resistance.
Other Fields
Automotive parts, ship structures, boiler pipes, etc.
III. Key Performance Parameters
Chemical Composition
C ≤0.22%, Mn ≤1.7%, P/S ≤0.035%.
Mechanical Properties
Tensile Strength: 500–650 MPa.
Yield Strength: ≥355 MPa (for wall thickness ≤16mm).
