The main steel pipe grades produced by JIS G3461 seamless boiler tubes include STB340, STB410, STBA22, STBA23, etc. After negotiation, other grades of steel pipes can also be supplied.
JIS G3461 Carbon steel pipes for boilers and heat exchangers
JIS G3461 specifies carbon steel pipes used to transfer heat inside and outside pipes, such as boiler water pipes, flue gas pipes, superheaters, air preheaters, etc.
JIS G3461 seamless standard specifies tubes for exchangers, condenser tubes, catalyst tubes, etc. However, this provision does not apply to steel pipes for heating furnaces and steel pipes for low-temperature heat exchangers.
The JIS G3461 standard generally applies to pipes with outer diameters between 15.9 mm and 139.8 mm.
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Grade:G3461 STB340 (STB35), G3461 STB410(STB42), G3461 STB510 (STB52)
Outer Dimensions: 19.05mm – 168.3mm
Wall Thickness:2.0mm – 14 mm
Length: max 19000mm
Chemical composition of JIS G3461carbon pipe:
|
Grade |
C |
Si |
Mn |
P |
S |
|
STB35 |
0.18Max |
0.35Max |
0.30~0.60 |
0.035Max |
0.035Max |
|
STB42 |
0.32Max |
0.35Max |
0.30~0.60 |
0.035Max |
0.035Max |
|
STB52 |
0.25Max |
0.35Max |
1.00~1.50 |
0.035Max |
0.035Max |
JIS G3461 tube Mechanical Properties:
|
Grade |
Tensile strength N/mm2 {kgf/mm2} |
Yield point N/mm2 {kgf/mm2} |
Elongation % |
||
|
Outside diameter 20mm or over |
Outside diameter 10mm or over to and excl. 10mm |
Outside diameter under 10mm |
|||
|
No. 11/12 test piece |
No. 11 test piece |
No. 11 test piece |
|||
|
STB340 |
340{35}min. |
175{18} min.. |
35 min. |
30 min |
27 min. |
|
STB410 |
410{42} min. |
255{26} min |
25 min. |
20 min |
17 min |
|
STB510 |
510{52} min. |
295{30} min |
25 min. |
20 min. |
17 min |
High pressure heat resistant alloy pipe
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