JIS G3461,G3462 Carbon steel/Alloy steel tubes

Standard specifies the , hereinafter refered to as the tubes, used for exchanger heat on the inside and outside of the tube, such as water tubes, smoke tubes, , air preheater tubes, etc.

JIS G3461 is the usages of the boiler, and heat exchanger tubes, , catalyst tubes, etc. used in chemical and petroleum industries. However, it is not applicable to the steel tubes for heating furnace and steel heat exchanger tubes for low temperature service.

The JIS G3461 boiler tube Size (mm):
Outer Dimensions: 19.05mm – 168.3mm
Wall Thickness:2.0mm – 14 mm
Length: max 19000mm

Painting: as requested.

Application: used for exchanging heat on the inside and outside of the tube, such as water tubes, smoke tubes, superherater tubes, air preheater tubes, etc. of boilers, and heat exchanger industries. it is not applicable to the steel tubes for heating furnace and those for heat exchangers for low temperature service.

The main products of steel / steel grade:

JIS G3461 tube Chemical Compositions(%)
Grade C Si Mn P S Cr Mo
STB340 ≤0.18 ≤0.35 0.30-0.60 ≤0.035 ≤0.035 / /
STB410 ≤0.32 ≤0.35 0.30-0.80 ≤0.035 ≤0.035 / /
STB510 ≤0.25 ≤0.35 1.00-1.50 ≤0.035 ≤0.035 / /
JIS G3461 tube Mechanical Properties
Grade Yield Strength (Mpa) Tensile Strength (Mpa) Elongation (%)
STB340 ≥175 ≥340 ≥35
STB410 ≥255 ≥410 ≥25
STB510 ≥295 ≥510 ≥25

Packing: Bare/bundles/crates/crate protection at the both sides of tubes or as per customers’ requirements .

JIS G3461 Equivalent steel grade:
JIS G3461 ASTM ASME BS DIN ISO ABS NK LRS DNV
STB 340 A178 SA178 A 3059-P1 320 17175 st 35.8 ABS D KSTB 33 Sec 6 320 Sec 4-E-TS360
STB 410 A178 C SA178 C 3059-P2 440 17175 st 45.8 ABS F KSTB 42 Sec 6 410 Sec 4-E-TS410-1
STB 510 17175 19Mn 5 Sec 4-E-TS510

Each tube haing passed the inspection shall be marked with the following items. However, the order of arranging the items is not specified. Further, in the case of either smaller tubs or request from the purchaser, the tubes may be bundled together and marked for each bundle by a suitable means.

  1. Class symbol
  2. Letter symbol indication the manufacturing method
  3. Dimensions
  4. Manufacturer’s name or its abbreviation
  5. Letter symbolS indicating the designation of special quality requirements
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  • Hot finished -S -H
  • Cold finished seamless steel tube -S -C
  • Electric resistance welded steel tube other than Hot finished and cold finished -E -G
  • Hot finished electric resistance welded steel tube -E -H
  • Cold finished electric resistance welded steel tube -E –C
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