JIS G3462 Alloy steel boiler and heat exchanger tubes

JIS G3462 specifies the alloy steel boiler tubes for exchanging heat on the inside and outside of the water tube,smoke tube superheater tubes,ect.

Grades:

  • STB12
  • STB13
  • STB20
  • STB22
  • STB23
  • STB24
  • STB25
  • STB26

Molybdenum steel tube:STB12,STB13

Chromium-molybdenum steel tube:STB20,STB22,STB23,STB24,STB25,STB26

 The JIS G3462 boiler tube Size:

  • Outer Dimensions: 19.05mm – 168.3mm
  • Wall Thickness:2.0mm – 14 mm
  • Length: max 19000mm

Chemical  Composition:

  Grade Chemical  Composition %
C Mn P S Si Cr Mo
STBA12 0.10-0.20 0.30-0.80 ≤0.035 ≤0.035 0.10-0.50 0.45-0.65
STBA13 0.15-0.25 0.30-0.80 ≤0.035 ≤0.035 0.10-0.50 0.45-0.65
STBA20 0.10-0.20 0.30-0.60 ≤0.035 ≤0.035 0.10-0.50 0.05-0.08 0.45-0.65
STBA22 ≤0.15 0.30-0.60 ≤0.035 ≤0.035 ≤0.50 0.08-1.25 0.45-0.65
STBA23 ≤0.15 0.30-0.60 ≤0.030 ≤0.030 0.50-1.00 1.00-1.50 0.45-0.65
STBA24 ≤0.15 0.30-0.60 ≤0.030 ≤0.030 ≤0.50 1.90-2.60 0.87-1.13
STBA25 ≤0.15 0.30-0.60 ≤0.030 ≤0.030 ≤0.50 4.00-6.00 0.45-0.65
STBA26 ≤0.15 0.30-0.60 ≤0.030 ≤0.030 0.25-1.00 8.00-10.0 0.90-1.10

 Mechanical Proerties:

  Grade Mechanical Proerties
Tensile Strength (Mpa) Yield Strength(Mpa) Elongation(%)
STBA12 ≥382 ≥206 ≥30
STBA13 ≥412 ≥206 ≥30
STBA20 ≥412 ≥206 ≥30
STBA22 ≥412 ≥206 ≥30
STBA23 ≥412 ≥206 ≥30
STBA24 ≥412 ≥206 ≥30
STBA25 ≥412 ≥206 ≥30
STBA26 ≥412 ≥206 ≥30

 

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

The tubes shall be manufactured by seamless process, electric resistance welding process, or butt welding process, and those of other grades shall be manufactured by seamless process or electric resistance welding process. The tube shall be as manufactured or as cold-finished condition, or they shall be subjected to appropriate heat treatment.

The tubes shall be practically straight. and the two ends shall be at right angles to the axis of the tube. The tubes shall be free from defects detrimental to practical use.




Welded pipes by manufacturing process

Sunny Steel produce an extensive selection of welded steel pipe including ERW, HFI, EFW, LSAW, DSAW and UOE type carbon steel pipe along with their respective flanges and fittings.

Electric Resistance Welded Pipe
ERW
High Frequency Induction (HFI) Welded Pipe
HFI
UOE (Uing and Oing forming) Pipes
UOE
SAW

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