JIS G3461


JIS G3461 Steel Pipe

JIS G3461 Carbon Steel Tubes are a pivotal component in the boiler and heat exchanger industry. These tubes play a crucial role in exchanging heat both internally and externally, making them indispensable for various applications such as water tubes, smoke tubes, superheater tubes, and air preheater tubes. Beyond their primary function, these tubes find relevance in sectors like chemical and petroleum. However, it’s essential to note that they aren’t suitable for low-temperature services. The production of these tubes involves a meticulous process, ensuring they meet the standards set by the Japanese Industrial Standards (JIS). With UNIACERO as your trusted supplier, you can be assured of the quality and reliability of these tubes, ensuring optimal performance in your operations.

JIS G3461 Specification

Our JIS G3461 Carbon Steel Tubes are manufactured with precision, ensuring they meet the highest industry standards. The production procedures involve seamless manufacturing, electric resistance welding, and both cold and hot finishing. These tubes come in various steel grades, including STB340 (STB35), STB410(STB42), and STB510 (STB52). The surface of the tubes is meticulously crafted to ensure durability and efficiency. They are available with different end types such as plain end, beveled end, and treading. Additionally, we offer joint methods and machining services tailored to your specific requirements.

Production StandardJIS G3461
Manufacturing ProcessesBW ERW  SMLS
Outside DiameterDN10 – DN125
Wall Thickness1.2mm – 12.5mm
Pipe Lengthspecific
Steel GradeSTB340 STB410 STB510
Corrosion PreventionLacquer, Varnish, Oiling, Galvanizing
End ProcessesSquare Cut, Bevelling, Threading, Socket
Further ProcessingWelding, Bending, Hole Drilling, Punching, Swaging, Tapering, Flaring, Expanding

JIS G3461 Dimension Table


Understanding the dimensions of the JIS G3461 Carbon Steel Tubes is crucial for their effective application. These tubes come with a wall thickness (WT) ranging from 2.0 mm to 12.7 mm. The outer diameter (OD) varies between 25 mm to 139.8 mm. Furthermore, the standard length of these tubes is 6M, but we can customize the length based on your specific needs. With these dimensions, you can ensure the perfect fit and seamless integration into your operations.

Outside Diameter mmThickness mm

Chemical Requirements of JIS G3461

The chemical composition of our JIS G3461 Carbon Steel Tubes is meticulously crafted to ensure optimal performance and longevity. While the exact chemical requirements vary based on the specific steel grade, you can trust that our tubes are manufactured to meet the highest industry standards. By choosing UNIACERO, you’re investing in tubes that are designed to deliver exceptional results, ensuring the efficiency and safety of your operations.

Symbol of GradeCSiMnPS
STB 3400.18 max.0.35 max.0.30 to 0.600.035 max.0.035 max.
STB 4100.32 max.0.35 max.0.30 to 0.800.035 max.0.035 max.
STB 5100.25 max.0.35 max.1.00 to 1.500.035 max.0.035 max.

Mechanical Requirements of JIS G3461

Mechanical properties are paramount when it comes to the functionality and durability of the JIS G3461 Carbon Steel Tubes. Our tubes are designed to withstand the rigors of their intended applications, ensuring they remain robust and efficient throughout their lifespan. Whether it’s tensile strength, yield strength, or elongation, our tubes are engineered to meet and exceed the industry’s mechanical requirements.

Mechanical Properties
Symbol of GradeTensile Strength N/mm2Yield Point or Proof Stress N/mm2Elongation %
Outside Diameter under 10 mmOutside Diameter 10 mm or over to and excl.20 mmOutside Diameter 20 mm or over
Test Piece for Tensile Test
No. 11 Test PieceNo. 11 Test PieceNo. 11 or No. 12 Test Piece
STB 340340 min.175 min.27 min.30 min.35 min.
STB 410410 min.255 min.17 min.20 min.25 min.
STB 510510 min.295 min.17 min.20 min.25 min.
NOTE: 1 N/mm2=1 MPa

Steel Grades in JIS G3461

The JIS G3461 Carbon Steel Tubes are available in various steel grades to cater to different applications and requirements. The primary grades include STB340 (STB35), STB410(STB42), and STB510 (STB52). Each grade offers unique properties and benefits, ensuring you get the perfect match for your specific needs. With UNIACERO, you can be confident in the quality and performance of the steel grades we offer, ensuring your operations run smoothly and efficiently.

Production Tolerance of JIS G3461

Table Tolerances on Outside Diameter Unit: mm
Division of outside diameterToleranoes on outside diameter
Hot finished seamless steel tubeCold finished seammless steel pipeElectric resistance welded steel tube other than cold finishedCold finished electric resistance welded steel tube
Under 25+ 0.4 -0.8[0.10[1.5[0.10
25 or over to and excl. 40[0.15[0.2[0.15
40 or over to and excl. 50[0.20[0.25[0.20
50 or over to and excl. 60[0.25[0.3[0.25
60 or over to and excl. 80[0.3[0.4[0.3
80 or over to and excl. 100[0.4+0.4 -0.6[0.4
100 or over to and excl.120+ 0.4 -1.2+ 0.4 -0.6+ 0.4 -0.8+ 0.4 -0.6
120 or over to and excl.160+ 0.4 -0.8+ 0.4 -1.0+ 0.4 -0.8
160 or over to and excl.200+ 0.4 -1.8+ 0.4 -1.2+ 0.4 -1.2+ 0.4 -1.2
200 or over+ 0.4 -2.4+ 0.4 -1.6+ 0.4 -1.6+ 0.4 -1.6

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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