1. Definitions and standards
Material type: STPG370 is a Japanese Industrial Standard (JIS) carbon structural steel, mainly used in the manufacture of seamless steel tubes, with '370' indicating a minimum yield strength of 370 MPa12. Its '370' means the minimum yield strength is 370 MPa.
Corresponding national standard material: equivalent to the Chinese standard 20-gauge steel or 25-gauge steel (low carbon steel category).
2. Chemical composition
Content of major elements (mass per cent)
Carbon (C): ≤0.25%;
Silicon (Si): ≤0.35%;
Manganese (Mn): 0.30%-0.90%;
Sulfur (S), phosphorus (P): both ≤ 0.040%.
3. Performance characteristics
Mechanical properties: medium strength and good plasticity, suitable for cold working (such as cold drawing, cold rolling) forming.
Corrosion resistance: as a carbon steel, need to be coated or plated to enhance corrosion resistance, suitable for non-corrosive media.
4. Typical application scenarios
Fluid Conveyance: Manufacture of seamless pipes for conveying water, steam, oil, natural gas and other media;
Mechanical components: for automotive drive shafts, construction scaffolding, oil drilling rods and other structural components;
Precision engineering: cold-drawn seamless precision tubes are suitable for scenarios requiring high surface finish and strict dimensional accuracy (e.g. hydraulic systems, precision instruments).
5. Economy and processing advantages
Lightweight design: hollow cross-section structure is lighter than solid steel under the same strength, reducing transport and installation costs;
Processing convenience: supports secondary processing such as welding and cutting, widely used in customised piping systems.
Summary: STPG370 is a cost-effective low carbon structural steel, which has become a general-purpose material in petroleum, machinery, construction and other fields due to its medium strength, good processing performance and lightweight advantages.
