JIS G3456
JIS G3456 Steel Pipe
JIS G3456 is a renowned Japanese Industrial Standard that specifies carbon steel pipes designed explicitly for high-temperature service. These pipes are crafted based on the ISO 9329-2:1997 and ISO 9330-2:1997 standards, but with certain technical modifications to meet the unique requirements of our clientele. The JIS G3456 standard is pivotal for carbon steel pipes primarily used for piping at temperatures exceeding 350℃. At UNIACERO, we ensure that our pipes are available in various grades, including STPT370, STPT410, and STPT480, each tailored to offer distinct yield strengths. Whether you need a seamless or a welded process, we have got you covered. Our commitment to quality is further solidified by the fact that the JIS G3456 standard was last updated in 2019, ensuring that our products are always in line with the latest industry standards.
JIS G3456 Specification
Our JIS G3456 carbon steel pipes come in two primary manufacturing processes: Electric resistance welded and seamless. The electric resistance welded pipes have a size range of O.D.: 15.0～660mm and W.T.: 2～20mm, available in grades STPT370 and STPT410. On the other hand, our seamless pipes, which can be hot-finished or cold-finished, range in size from O.D.: 15.0～660mm and W.T.: 2～50mm. These are available in grades STPT370, STPT410, and STPT480. Regardless of your choice, we ensure that the pipes have a standard length of 6M or as specified by your requirements. Both types come with plain or beveled ends, ensuring a perfect fit for your projects.
| Production Standard | JIS G3456 |
| Manufacturing Processes | ERW ( Electric Resistance Welding) |
| SMLS (Hot Finished / Cold Drawn Seamless) | |
| Outside Diameter | 10.5-660.4mm |
| Wall Thickness | 1.7mm – 52mm |
| Pipe Length | 3 – 18 mtrs meters |
| Steel Grade | STPT 370 |
| STPT 410 | |
| STPT 480 | |
| Corrosion Prevention | Lacquer, Varnish, Oiling, Galvanizing |
| FBE, 2LPP, 3LPP, 2LPE, 3LPE | |
| End Processes | Square Cut, Bevelling, Threading, Grooving , Shouldering |
| Further Processing | Welding, Bending, Hole Drilling, Punching, Swaging, Tapering, Flaring, Expanding |
JIS G3456 Dimension Table
Our JIS G3456 pipes adhere to strict dimensional standards. For hot-working seamless steel pipes, the allowable deviation in outer diameter ranges from ±0.5mm for pipes under 50mm to ±0.8% for pipes over 200mm. For cold-working seamless steel and electric-resistance welded steel pipes, the allowable deviation is ±0.03mm for pipes up to 40mm and ±0.8% for pipes over 40mm. At UNIACERO, precision is our priority, ensuring that our pipes fit seamlessly into your projects.
| Outside Diameter mm | Nominal Wall Thickness mm | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| SCH10 | SCH20 | SCH30 | SCH40 | SCH60 | SCH80 | SCH100 | SCH120 | SCH140 | SCH160 | |
| 10.5 | – | – | – | 1.7 | – | 2.4 | – | – | – | – |
| 13.8 | – | – | – | 2.2 | – | 3 | – | – | – | – |
| 17.3 | – | – | – | 2.3 | – | 3.2 | – | – | – | – |
| 21.7 | – | – | – | 2.8 | – | 3.7 | – | – | – | 4.7 |
| 27.2 | – | – | – | 2.9 | – | 3.9 | – | – | – | 5.5 |
| 34 | – | – | – | 3.4 | – | 4.5 | – | – | – | 6.4 |
| 42.7 | – | – | – | 3.6 | – | 4.9 | – | – | – | 6.4 |
| 48.6 | – | – | – | 3.7 | – | 5.1 | – | – | – | 7.1 |
| 60.5 | – | – | – | 3.9 | – | 5.5 | – | – | – | 8.7 |
| 76.3 | – | – | – | 5.2 | – | 7 | – | – | – | 9.5 |
| 89.1 | – | – | – | 5.5 | – | 7.6 | – | – | – | 11.1 |
| 101.6 | – | – | – | 5.7 | – | 8.1 | – | – | – | 12.7 |
| 114.3 | – | – | – | 6 | – | 8.6 | – | 11.1 | – | 13.5 |
| 139.8 | – | – | – | 6.6 | – | 9.5 | – | 12.7 | – | 15.9 |
| 165.2 | – | – | – | 7.1 | – | 11.0 | – | 14.3 | – | 18.2 |
| 216.3 | – | 6.4 | 7 | 8.2 | 10.3 | 12.7 | 15.1 | 18.2 | 20.6 | 23.0 |
| 267.4 | – | 6.4 | 7.8 | 9.3 | 12.7 | 15.1 | 18.2 | 21.4 | 25.4 | 28.6 |
| 318.5 | – | 6.4 | 8.4 | 10.3 | 14.3 | 17.4 | 21.4 | 25.4 | 28.6 | 33.3 |
| 355.6 | 6.4 | 7.9 | 9.5 | 11.1 | 15.1 | 19.0 | 23.8 | 27.8 | 31.8 | 35.7 |
| 406.4 | 6.4 | 7.9 | 9.5 | 12.7 | 16.7 | 21.4 | 26.2 | 30.9 | 36.5 | 40.5 |
| 457.2 | 6.4 | 7.9 | 11.1 | 14.3 | 19.0 | 23.8 | 29.4 | 34.9 | 39.7 | 45.2 |
| 508 | 6.4 | 9.5 | 12.7 | 15.1 | 20.6 | 26.2 | 32.5 | 38.1 | 44.4 | 50.0 |
| 558.8 | – | – | – | 15.9 | 22.2 | 28.6 | 34.9 | 41.3 | 47.6 | 54.0 |
| 609.6 | – | – | – | 17.5 | 24.6 | 31.0 | 38.9 | 46.0 | 52.4 | 59.5 |
| 660.4 | – | – | – | 18.9 | 26.4 | 34.0 | 41.6 | 49.1 | 56.6 | 64.2 |
Chemical Requirements of JIS G3456
Our JIS G3456 pipes have a stringent chemical composition to ensure durability and high performance. The carbon content for grades STPT370, STPT410, and STPT480 are ≤0.25%, ≤0.30%, and ≤0.33% respectively. The silicon content ranges from 0.10-0.35% across all grades. The manganese content varies between 0.30-0.90% for STPT370 and 0.30-1.00% for STPT410 and STPT480. All grades have phosphorus and sulfur contents of ≤0.035%.
| Designation of Grade | C | Si | Mn | P | S |
|---|---|---|---|---|---|
| STPT 370 | 0.25 max. | 0.10 to 0.35 | 0.30 to 0.90 | 0.035 max. | 0.035 max. |
| STPT 410 | 0.30 max. | 0.10 to 0.35 | 0.30 to 1.00 | 0.035 max. | 0.035 max. |
| STPT 480 | 0.33 max. | 0.10 to 0.35 | 0.30 to 1.00 | 0.035 max. | 0.035 max. |
Mechanical Requirements of JIS G3456
Our pipes are designed to withstand the rigors of high-temperature applications. The yield strengths for STPT370, STPT410, and STPT480 are ≥216 MPa, ≥245 MPa, and ≥275 MPa, respectively. The tensile strengths are ≥370 MPa for STPT370, ≥410 MPa for STPT410, and ≥480 MPa for STPT480. These mechanical properties ensure that our pipes can handle the pressures of your projects without compromise.
| Designation of Grade | Tensile Strength N/mm2 | Yield Point or Proof Stress N/mm2 |
|---|---|---|
| STPT 370 | 370 min. | 215 min. |
| STPT 410 | 410 min. | 245 min. |
| STPT 480 | 480 min. | 275 min. |
Steel Grades in JIS G3456
At UNIACERO, we offer JIS G3456 pipes in three primary grades: STPT370, STPT410, and STPT480. Each grade is tailored for specific applications, with STPT370 being the most versatile, STPT410 offering a balance between strength and flexibility, and STPT480 being the strongest. These grades have minimum yield strengths of 215 MPa, 245 MPa, and 315 MPa, respectively, ensuring that you always have the right pipe for the job.
- STPT370
- STPT410
- STPT480
Production Tolerance of JIS G3456
| Table 5 Tolerances on Outside Diameter, Wall Thickness and Deviation in Wal Thickness | |||
|---|---|---|---|
| Division | Tolerances on outside diameter | Tolerances on thickness | Tolerance on deviatiol 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 % o wall thickness |
| 50mm and over, up to 160mm [1% | |||
| 160mm and over, up to 200mm [1.6mm | 4mm and over [12.5% | ||
| 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 toleranoes shall be [0.5%. | |||
| Cold finished seamless stee pipe and electric resistancewelded steel pipe | Up to 40mm [0.3mm | Up to 2 mm [0.2mm | – |
| 40mm and over [0.8% | 2mm and over [10% | ||
