JIS G3456 is a Japanese Industrial Standard that specifies carbon steel pipes for high-temperature service.
JIS G3456 standard was prepared based on ISO 9329-2:1997 and ISO 9330-2:1997 with some modifications of the technical requirements.
JIS G3456 applies to carbon steel pipes mainly used for piping at temperatures above 350℃. The pipes are available in various grades, including STPT370, STPT410, and STPT480, which have minimum yield strengths of 215 MPa, 245 MPa, and 315 MPa, respectively. The pipes can be manufactured using either a seamless or welded process.
The JIS G3456 standard was last updated in 2019 (JIS G3456:2019). The standard is protected by copyright and the full text can be accessed through the official website of the Japanese Standards Association.
| Standard | Grade | C | Si | Mn | P | S |
| JIS G3456 | STPT370 | ≤0.25 | 0.10-0.35 | 0.30-0.90 | ≤0.035 | ≤0.035 |
| STPT410 | ≤0.30 | 0.10-0.35 | 0.30-1.00 | ≤0.035 | ≤0.035 | |
| STPT480 | ≤0.33 | 0.10-0.35 | 0.30-1.00 | ≤0.035 | ≤0.035 |
| Standard | Grade | Yield Strength (Mpa) | Tensile Strength (Mpa) | Elongation (%) |
| JIS G3456 | STPT370 | ≥216 | ≥370 | ≥30 |
| STPT410 | ≥245 | ≥410 | ≥25 | |
| STPT480 | ≥275 | ≥480 | ≥25 |
The tubes shall be manufactured by seamless process, electric resistance welding process, or butt welding process, and those of other grades shall be manufactured by seamless process or electric resistance welding process. The tube shall be as manufactured or as cold-finished condition, or they shall be subjected to appropriate heat treatment.
The tubes shall be practically straight. and the two ends shall be at right angles to the axis of the tube. The tubes shall be free from defects detrimental to practical use.
| Division | Tolerances on outside diameter | Tolerances on wall thickness | Tolerance on deviation in wall thickness |
| Hot finished seamless steel pipe | Up to 50 mm 【0.5mm | ≤Up to 4 mm 【0.5mm |
Up to and incl. 20 % of wall thickness |
| 50mm and over, up to 160mm 【1% |
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| 160mm and over, up to 200mm 【1.6mm |
≤4mm and over 【12.5% |
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| 200mm and over 【0.8% | |||
| However, for pipes 350mm and over in diameter, the length of circumference may substitute as a basis for tolerances, In this case, the tolerances shall be 【0.5%. |
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| Cold finished seamless steel pipe |
Up to 40mm 【0.3mm | ≤Up to 2 mm 【0.2mm |
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| 40mm and over 【0.8% | ≤2mm and over 【10% |
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| However, for pipes 350mm and over in diameter, the length of circumference may substitute as a basis for tolerances. In this case, the tolerances shall be 【0.5% |
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Cast basalt lined steel pipe is composed by lined with cast basalt pipe, outside steel pipe and cement mortar filling between the two layers.
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