JIS G3462 boiler tubes

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JIS G3462 is a JIS standard refers to alloy steel boiler tubes and heat exchanger tubes. This steel tubes is used in carbon steel pipes for tube heat-exchange inside and outside, such as boiler water steel pipe, superheater tube, condenser tube and more.




However, it is not applicable to the steel tubes for heating furnace and steel heat exchanger tubes for low temperature service.

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：
  GradeChemical  Composition %
CMnPSSiCrMo
STBA120.10-0.200.30-0.80≤0.035≤0.0350.10-0.50…0.45-0.65
STBA130.15-0.250.30-0.80≤0.035≤0.0350.10-0.50…0.45-0.65
STBA200.10-0.200.30-0.60≤0.035≤0.0350.10-0.500.05-0.080.45-0.65
STBA22≤0.150.30-0.60≤0.035≤0.035≤0.500.08-1.250.45-0.65
STBA23≤0.150.30-0.60≤0.030≤0.0300.50-1.001.00-1.500.45-0.65
STBA24≤0.150.30-0.60≤0.030≤0.030≤0.501.90-2.600.87-1.13
STBA25≤0.150.30-0.60≤0.030≤0.030≤0.504.00-6.000.45-0.65
STBA26≤0.150.30-0.60≤0.030≤0.0300.25-1.008.00-10.00.90-1.10
 Mechanical Proerties：
  GradeMechanical 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.










O.D.TOLERANCE ON OUTSIDE DIAMETER
HOT ROLLED SEAMLESS PIPESSEAMLESS PIPES THROUGH QUENCH AND NORMALIZEDCOLD DRAWN SEAMLESS PIPES THRONG, THE HOT TREATMENT EXCEPT QUENCH AND NORMALIZEDELECTRIC WELDED PIPES EXCEPT COLD DRAWNCOLD DRAWN ELECTRIC WELDED PIPES
MM
< td>+0.4
-0.8		±0.25±0.10±0.15±0.10
<25 .40="" td="">±0.25±0.15±0.20±0.15
<40-50 td="">±0.25±0.20±0.25±0.20
<50 .60="" td="">±0.25±0.25±0.30±0.25
<60-80 td="">±0.30±0.30±0.40±0.30
<80 .100="" td="">±0.40±0.40-0.60,+0.40±0.40
<100-120 td="">+0.4
-1.2		-0.60,+0.40-0.60,+0.40-0.80,+0.40-0.60,+0.40
<120-160 td="">-0.80,+0.40-0.80,+0.40-1.00,+0.40-0.80,+0.40
<160-200 td="">-1.8,+0.4-1.20,+0.40-1.20,+0.40-1.20,+0.40-1.20,+0.40
<200 td="">-2.4,+0.4-1.60,+0.40-1.60,+0.40-1.60,+0.40-1.60,+0.40

Tolerance on Wall Thickness in JIS G3462


WALL
THICKNESS
(MM)		HOT ROLLED SEAMLESS PIPECOLD DRAWN SEAMLESS PIPEELECTRIC WELDED PIPE
O.D（MM）O.D（MM）O.D（MM）
< td><100 td="">< td><40 td="">< td><40 td="">
(%)
< td>---0,+0.4mm+22
-0		-0,+0.3mm+18
0
<2-2 .4="" td="">-0,+40-+20
-,0		+18
-0
<2 .4-3.8="" td="">-0,+35-0,+35
<3 .8-4.6="" td="">-0,+23-0,+33
<4 .6="" td="">-0,+28-0,+28

Tolerance on the Length in JIS G3462

ITEMTOLERANCE AN LENGTH
OD<50mm td=""><7m td="">-0, +7mm
<=7mEvery 3m increase in length, the plus tolerance be increased by 3mm with a maximum of 15mm
OD<=50mm<7m td="">-0, +10mm
<=7mEvery 3m increase in length, the plus tolerance be increased by 3mm with a maximum of 15mm
OD: Outside Diameter

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