Basic Info.
Product Description
JIS G3462 Alloy Steel Boiler Tube
This standard specifies alloy steel pipes (hereinafter referred to as pipes) used for transferring heat inside and outside the pipes, such as water pipes used in boilers, smoke pipes, superheaters, air preheaters, etc., and chemical This standard specifies tubes used for heat exchangers, condenser tubes, catalyst tubes, etc. used in the industry and petroleum industry. However, this does not apply to steel pipes for heating furnaces and steel pipes for low-temperature heat exchangers. This standard normally applies to pipes with an outside diameter between 15,9 mm and 139,8 mm.
JIS G3462 boiler tube specification:
Grades: STB12,STB13,STB20,STB22,STB23,STB24,STB25,STB26
Outer Dimensions: 15.9-139.8mm
Wall Thickness: 1.2-12.5 mm
Length: max 19000mm
JIS G3462 Chemical Composition:
Standard | Grade | Chemical Composition % | ||||||
C | Mn | P | S | Si | Cr | Mo | ||
JIS G3462 | 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 | |
JIS G3462 Mechanical Proerties:
Standard | Grade | Mechanical Properties | ||
Tensile Strength (Mpa) | Yield Strength(Mpa) | Elongation(%) | ||
JIS G3462 | 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 | |
Manufacturing method
The manufacturing method shall be as follows:
a) Pipes shall be manufactured by a combination of the pipe-making method and finishing method shown in Table 1. Symbols representing manufacturing methods shall be shown in Table 1.
b) The pipe shall be heat treated according to Table 2. However, heat treatments other than those listed in Table 2 may be performed by agreement between the parties concerned with delivery.
c) Pipe ends shall be plain ends unless otherwise specified.
d) If the pipe is manufactured by electric resistance welding, the outer and inner weld beads shall be removed so as to smoothly follow the shape of the pipe. However, the internal weld bead may be left as welded by agreement between the parties concerned.
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