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JIS G3460 STPL380 seamless steel pipe is a high-strength, high-corrosion-resistant seamless steel pipe that is commonly used to manufacture high-voltage equipment and pipelines in the fields of petroleum, chemical industry, electric power, etc. This kind of steel pipe is made of high-quality carbon steel or alloy steel, and has excellent mechanical properties and corrosion resistance after strict production process control.
The yield strength of STPL380 high-pressure steel pipe is relatively high, ranging from ≥295MPa. It can withstand large pressure and load, has good low-temperature toughness and welding performance, and can meet the requirements of use in various complex environments. In addition, STPL380 seamless carbon steel pipe also has good fatigue resistance and corrosion cracking resistance, which can ensure the long-term stable operation of the pipeline system.
Chemical composition of JIS G3460 STPL380 pipe
|
Letter symbol of grade |
Chemical Composition % | |||||
| C | Si | Mn | P | S | Ni | |
| STPL 380 | 0.25 max. | 0.35 max. | 1.35 max. | 0.035 max. | 0.035 max. | – |
Mechanical properties of JIS G3460 STPL380 steel pipe
| Letter symbol of grade | Mechanical properties | |||||
| Tensile strength | Yield point or proof stress | Elongation % | ||||
| kgf/mm2 {N/mm2} | kgf/mm2 {N/mm2} | No. 11 or No. 12 test piece | No. 5 test piece | No. 4 test piece | ||
| Longitudinal | Transverse | Longitudinal | Transverse | |||
| STPL 380 | 39 {382}min. | 21{206} min. | 35 min. | 25 min. | 30 min. | 22 min. |
JIS G3460 STPL380 carbon steel pipe
Heat treatment of JIS G3460 STPL380
| Grade | Heat treatment |
| STPL380 | Normalized, Normalized, Post-tempered, Or quenching and tempering |
Standard:JIS G3460
JIS G3460 STPL380 Steel tubes for piping used at particularly low temperature below freezing.
JIS G3460 STPL380 Steel tubes usually applies to pipes with an outer diameter of 10.5 mm to 660.4 mm.
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UT(Ultrasonic examination)
AR(As Hot Rolled only)
TMCP (Thermal Mechanical Control Processing)
N(Normalized)
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