ISO 3183 erw steel pipe

JIS G 3461 Carbon Steel Boiler and heat exchanger tube

  • OD range: 15.9mm to 139.8mm.
  • Production process: Seamless and electric resistance welding.
  • Steel grades we offer: STB340 (STB35), STB410 (STB42) and STB510 (STB52).

JIS G3461 carbon steel boiler and heat exchanger tubes transfer heat well, inside and out. They are ideal for water pipes, smoke tubes, superheater tubes, and air preheaters. These tubes are also useful in the chemical and petroleum industries. However, they are not suitable for low temperature services.

All of our pipes are cold normalized before processing. They are either normalized or quenched and tempered, per their manufacturing process. This meets the high-temperature service requirements.

UNIASEN makes small tubes for compact heat exchangers and large tubes for industrial boilers. We follow Japanese Industrial Standards for carbon steel tube manufacturing. This ensures the highest quality and performance in the steel tubes you receive.

JIS G3461 Specification

Production Standard JIS G3461
Manufacturing Processes BW, ERW, SMLS
Outside Diameter DN10 – DN125
Wall Thickness 1.2mm – 12.5mm
Pipe Length specific, random
Steel Grade STB340, STB410, STB510
Corrosion Prevention Lacquer, Varnish, Oiling, Galvanizing
End Processes Square Cut, Bevelling, Threading, Socket
Further Processing Welding, Bending, Hole Drilling, Punching, Swaging, Tapering, Flaring, Expanding

Dimension of JIS G3461

Permissible Specified Outside Diameter and Specified Wall Thickness
Specified Outside Diameter D mm (in.) Specified Wall Thickness t mm (in.)
Special Light Sizes a Regular Sizes
≥ 10.3 (0.405) to < 13.7 (0.540) ≥ 1.7 (0.068) to ≤ 2.4 (0.094)
≥ 13.7 (0.540) to < 17.1 (0.675) ≥ 2.2 (0.088) to ≤ 3.0 (0.118)
≥ 17.1 (0.675) to < 21.3 (0.840) ≥ 2.3 (0.091) to ≤ 3.2 (0.125)
≥ 21.3 (0.840) to < 26.7 (1.050) ≥ 2.1 (0.083) to ≤ 7.5 (0.294)
≥ 26.7 (1.050) to < 33.4 (1.315) ≥ 2.1 (0.083) to ≤ 7.8 (0.308)
≥ 33.4 (1.315) to < 48.3 (1.900) ≥ 2.1 (0.083) to ≤ 10.0 (0.394)
≥ 48.3 (1.900) to < 60.3 (2.375) ≥ 2.1 (0.083) to ≤ 12.5 (0.492)
≥ 60.3 (2.375) to < 73.0 (2.875) ≥ 2.1 (0.083) to ≤ 3.6 (0.141) > 3.6 (0.141) to ≤ 14.2 (0.559)
≥ 73.0 (2.875) to < 88.9 (3.500) ≥ 2.1 (0.083) to ≤ 3.6 (0.141) > 3.6 (0.141) to ≤ 20.0 (0.787)
≥ 88.9 (3.500) to < 101.6 (4.000) ≥ 2.1 (0.083) to ≤ 4.0 (0.156) > 4.0 (0.156) to ≤ 22.0 (0.866)
≥ 101.6 (4.000) to < 168.3 (6.625) ≥ 2.1 (0.083) to ≤ 4.0 (0.156) > 4.0 (0.156) to ≤ 25.0 (0.984)
≥ 168.3 (6.625) to < 219.1 (8.625) ≥ 2.1 (0.083) to ≤ 4.0 (0.156) > 4.0 (0.156) to ≤ 40.0 (1.575)
≥ 219.1 (8.625) to < 273.1 (10.750) ≥ 3.2 (0.125) to ≤ 4.0 (0.156) > 4.0 (0.156) to ≤ 40.0 (1.575)
≥ 273.1 (10.750) to < 323.9 (12.750) ≥ 3.6 (0.141) to ≤ 5.2 (0.203) > 5.2 (0.203) to ≤ 45.0 (1.771)
≥ 323.9 (12.750) to < 355.6 (14.000) ≥ 4.0 (0.156) to ≤ 5.6 (0.219) > 5.6 (0.219) to ≤ 45.0 (1.771)
≥ 355.6 (14.000) to < 457 (18.000) ≥ 4.5 (0.177) to ≤ 7.1 (0.281) > 7.1 (0.281) to ≤ 45.0 (1.771)
≥ 457 (18.000) to < 559 (22.000) ≥ 4.8 (0.188) to ≤ 7.1 (0.281) > 7.1 (0.281) to ≤ 45.0 (1.771)
≥ 559 (22.000) to < 711 (28.000) ≥ 5.6 (0.219) to ≤ 7.1 (0.281) > 7.1 (0.281) to ≤ 45.0 (1.771)
≥ 711 (28.000) to < 864 (34.000) ≥ 5.6 (0.219) to ≤ 7.1 (0.281) > 7.1 (0.281) to ≤ 52.0 (2.050)
≥ 864 (34.000) to < 965 (38.000) ≥ 5.6 (0.219) to ≤ 52.0 (2.050)
≥ 965 (38.000) to < 1422 (56.000) ≥ 6.4 (0.250) to ≤ 52.0 (2.050)
≥ 1422 (56.000) to < 1829 (72.000) ≥ 9.5 (0.375) to ≤ 52.0 (2.050)
≥ 1829 (72.000) to < 2134 (84.000) ≥ 10.3 (0.406) to ≤ 52.0 (2.050)
NOTE Standardized values for specified outside diameter and specified wall thickness of pipe are given in ISO 4200 [7] and ASME B36.10M[8]
a Pipe having the combination of specified outside diameter and specified wall thickness is defined as special light size pipe; other combinations given in this table are defined as regular size pipe.

JIS G3461 Chemical Requirement

Our JIS G 3461 Carbon Steel Tubes. Their chemical composition is carefully regulated during manufacturing. This ensures they can withstand the high temperatures and pressures in boilers and heat exchangers. This precise control of the chemical composition makes the tubes resistant to corrosion and wear. It extends their service life and reduces maintenance needs.

Symbol of Grade C Si Mn P S
STB 340 0.18 max. 0.35 max. 0.30 to 0.60 0.035 max. 0.035 max.
STB 410 0.32 max. 0.35 max. 0.30 to 0.80 0.035 max. 0.035 max.
STB 510 0.25 max. 0.35 max. 1.00 to 1.50 0.035 max. 0.035 max.

Mechanical Requirement of JIS G3461

At UNIASEN we recognise the critical role that mechanical properties play in the performance of heat exchangers and boilers. Our JIS G 3461 carbon steel tubes are able to withstand the stresses and strains of high temperature service. These tubes are heat treated, either normalised or quenched and tempered, to enhance their mechanical properties and ensure they provide optimum performance under demanding conditions.

Mechanical Properties
Symbol of Grade Tensile Strength N/mm2 Yield Point or Proof Stress N/mm2 Elongation %
Outside Diameter under 10 mm Outside Diameter 10 mm or over to and excl.20 mm Outside Diameter 20 mm or over
Test Piece for Tensile Test
No. 11 Test Piece No. 11 Test Piece No. 11 or No. 12 Test Piece
STB 340 340 min. 175 min. 27 min. 30 min. 35 min.
STB 410 410 min. 255 min. 17 min. 20 min. 25 min.
STB 510 510 min. 295 min. 17 min. 20 min. 25 min.
NOTE: 1 N/mm2=1 MPa

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