JIS G3455

Carbon Steel Round Tubing

JIS G3455 Steel Pipe

JIS G3455 is a renowned Japanese Industrial Standard that specifies carbon steel pipes designed for high-pressure service, withstanding temperatures up to approximately 350°C. These pipes, known for their robustness and durability, are essential for industries requiring safe and efficient high-pressure operations. Manufactured using the seamless process, electric resistance welding, or butt welding, these pipes guarantee reliability and longevity. With UNIACERO, you’re not just purchasing a product; you’re investing in quality and safety.

JIS G3455 Specification

Our JIS G3455 steel pipes come in a range of outer diameters from 15 to 600 mm and wall thicknesses from 1 to 50 mm. Depending on your needs, these tubes can be provided as manufactured, cold-finished, or subjected to appropriate heat treatment. Each pipe is meticulously crafted to be practically straight, ensuring that both ends are at right angles to the tube’s axis. With a commitment to excellence, we ensure that our pipes are free from any defects that could hinder their practical use.

Production StandardJIS G 3455
Manufacturing ProcessesSMLS (Hot Finished Seamless)
SMLS (Cold -Finished Seamless)
Outside Diameter10.3mm – 660.4mm (1/8″ – 26″)
Wall Thickness1.7 – 64.2 mm
Pipe Length6 meters, 12 meters or customized.
Steel GradeJIS G 3455 STS370JIS G 3455 STS410JIS G 3455 STS470
Corrosion PreventionLacquer, Varnish, Oiling, Galvanizing
End ProcessesSquare Cut, Bevelling, Threading, Grooving
Further ProcessingWelding, Bending, Hole Drilling, Punching, Swaging, Tapering, Flaring, Expanding

JIS G3455 Dimension Table


The JIS G3455 pipes we offer range in outer dimensions from 19.05mm to 114.3mm, with wall thicknesses varying from 2.0mm to 14 mm. The length can be customized up to a maximum of 16000mm, ensuring that we can cater to diverse industrial requirements. With precise dimensions, our pipes ensure a perfect fit and seamless integration into your operations.

Nominal DiameterOutside DiameterNominal Wall Thickness
ABmmSCH 40SCH 60SCH 80SCH 100SCH 120SCH 140SCH 160
151/221.7 a2.83.74.7
321 1/442.
401 1/
652 1/
903 1/2101.

Chemical Requirements of JIS G3455

Our JIS G3455 pipes adhere to strict chemical compositions. For instance, the STS 370 grade contains a maximum of 0.25% carbon, 0.100.35% silicon, and 0.301.10% manganese. Each grade has been formulated to provide optimal performance under high-pressure conditions, ensuring that the pipes can handle demanding environments.

Designation of GradeCSiMnPS
STS3700.25 max.0.10 to 0.350.30 to 1.100.035 max.0.035 max.
STS4100.30 max.0.10 to 0.350.30 to 1.400.035 max.0.035 max.
STS4800.33 max.0.10 to 0.350.30 to 1.500.035 max.0.035 max.
Other alloy elements than those given in this table may be added as required.

Mechanical Requirements of JIS G3455

Mechanical properties are paramount for high-pressure pipes. Our JIS G3455 pipes, such as the STS 370, have a minimum tensile strength of 373 MPa and a yield strength of 216 MPa. These properties ensure that our pipes can withstand high pressures without compromising their structural integrity.

Mechanical Properties
Designation of GradeTensile Strength N/mm2Yield Point or Proof Stress N/mm2Elongation %
Test pieces No.11 Test pieces No.12Test pieces No.5Test pieces No.4
Parallel to pipe axisPerpendicular to pipe axisParallel to pipe axisPerpendicular to pipe axis
STS370370 min.215 min.30 min.25 min.28 min.23 min.
STS410410 min.245 min.25 min.20 min.24 min.19 min.
STS480480 min.275 min.25 min.20 min.22 min.17 min.
NOTE: 1 N/mm2=1 MPa

Steel Grades in JIS G3455

We offer four distinct grades under the JIS G3455 specification: STS 370, STS 410, STS 480, and STS 510. Each grade has been developed to cater to different industrial needs, ensuring that you can find the perfect fit for your operations. With UNIACERO, you get the flexibility to choose the grade that aligns with your specific requirements.

Reference Resource

Our Advantages

  1. Over 25 years of experience in pipeline production and installation.
  2. Comprehensive inspection equipment.
  3. Independent product serial numbers for traceability.
  4. Advanced production equipment – Seamer high-frequency welding machine from the United States.
  5. Complete qualifications – API 5L/API 5CT/FM/UL fire pipe certification, etc.
  6. Wide range of products – independently developed solar torque tubes, highly favored in the European market.
  7. Customers spread across the globe.
  8. Excellent after-sales service and sense of responsibility.

Application Scenarios

Our steel pipes are engineered to withstand high temperatures, corrosive environments, and varying pressures, ensuring reliability and safety in the complex petrochemical processes. 

Whether it’s transferring crude oil, natural gas, or chemical intermediates, the robustness and versatility of steel pipes make them indispensable components of the plant’s infrastructure, contributing to efficient production and maintenance of stringent safety standards.

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