we have obtained ISO 9001, ISO 14001, ISO 45001, CE, AAA-level credit rating certification, etc.
we have obtained ISO 9001, ISO 14001, ISO 45001, CE, AAA-level credit rating certification, etc.
JIS G3462 specifies the alloy boiler steel tubes used for exchanging heat on the inside and outside of the tube, with 8 steel grades from STBA12-STBA26, it has the similar application as JIS G3461, steel tube of this specification could be supplied as U tube. However, it is not applicable to the steel tubes for heating furnace and those for heat exchangers of low temperature service. For final product, heat treatment of the bent portion is not usually performed. However, if there is a request from the orderer, agreement on heat treatment
Specification：
OD: 6mm-760mm
WT: 1mm-60mm
Length: 5-12m or as required
Application: Boiler pipe, super heater tube, heat exchanger tube.
Supplementary Technology: plastic pipe cap, hot rolled or cold drawn, tension test, hardness test, flattening test, hydrostatic test,
Surface: Bared or painted, galvanized or with oiled or client option.
Delivery state: Hot Rolled, Cold Drawn
Steel Grade: STBA 12, STBA 13, STBA 20, STBA 22, STBA 23, STBA 24, STBA 25
Chemical Composition
|
JIS G3462 Grade |
C≤ |
Si≤ |
Mn≤ |
P≤ |
S≤ |
Cr |
Mo |
|
STBA 12 |
0.10 ~0.20 |
0.10~0.50 |
0.30~0.80 |
0.035 |
0.035 |
- |
0.45~0.65 |
|
STBA 13 |
0.15~0.25 |
0.10~0.50 |
0.30~0.80 |
0.035 |
0.035 |
- |
0.45~0.65 |
|
STBA 20 |
0.10 ~0.20 |
0.10~0.50 |
0.30~0.60 |
0.035 |
0.035 |
0.050~0.080 |
0.45~0.65 |
|
STBA 22 |
0.15 |
0.50 |
0.30~0.60 |
0.035 |
0.035 |
0.80~1.25 |
0.45~0.65 |
|
STBA 23 |
0.15 |
0.50~1.00 |
0.30~0.60 |
0.030 |
0.030 |
1.00~1.50 |
0.45~0.65 |
|
STBA 24 |
0.15 |
0.50 |
0.30~0.60 |
0.030 |
0.030 |
1.90~2.60 |
0.87~1.13 |
|
STBA 25 |
0.15 |
0.50 |
0.30~0.60 |
0.030 |
0.030 |
4.00~6.00 |
0.45~0.65 |
|
STBA 26 |
0.15 |
0.25~1.00 |
0.30~0.60 |
0.030 |
0.030 |
8.00~10.00 |
0.90~1.10 |
Mechanical Property
|
JIS G3462 Grade |
Tensile Property (N/mm2) |
Yield Point or Yield Strength (N/mm2) |
Elongation (%) |
||
|
OD ≥ 20 mm |
10 mm ≤ OD ＜20 mm |
OD ＜10 mm |
|||
|
NO. 12 Sample |
NO. 11 Sample |
NO. 11 Sample |
|||
|
Longitudinal |
Transverse |
Transverse |
|||
|
STBA12 |
≥ 382 |
≥ 206 |
≥ 30 |
≥ 25 |
≥ 22 |
|
STBA13 |
≥ 412 |
≥ 206 |
≥ 30 |
≥ 25 |
≥ 22 |
|
STBA20 |
≥ 412 |
≥ 206 |
≥ 30 |
≥ 25 |
≥ 22 |
|
STBA22 |
≥ 412 |
≥ 206 |
≥ 30 |
≥ 25 |
≥ 22 |
|
STBA23 |
≥ 412 |
≥ 206 |
≥ 30 |
≥ 25 |
≥ 22 |
|
STBA24 |
≥ 412 |
≥ 206 |
≥ 30 |
≥ 25 |
≥ 22 |
|
STBA25 |
≥ 412 |
≥ 206 |
≥ 30 |
≥ 25 |
≥ 22 |
|
STBA26 |
≥ 412 |
≥ 206 |
≥ 30 |
≥ 25 |
≥ 22 |
Equivalent Steel Grade
|
KS |
ASTM |
JIS |
DIN |
BS |
||||
|
Grade number |
GRADE |
Grade number |
GRADE |
Grade number |
GRADE |
Grade number |
GRADE |
Grade number |
|
D 3572 |
STHA12 |
A161 |
T1 |
G 3462 |
STBA12 |
17175 |
15Mo 3 |
- |
|
STHA13 |
A209 |
T1a |
STBA13 |
- |
- |
- |
- |
|
|
STHA20 |
A213 |
T2 |
STBA20 |
- |
- |
- |
- |
|
|
STHA22 |
A213 |
T12 |
STBA22 |
17175 |
13Cr Mo 44 |
3059 |
S1 620 |
|
|
STHA23 |
A199 |
T11 |
STBA23 |
- |
- |
- |
- |
|
|
STHA24 |
A199 |
T22 |
STBA24 |
17175 |
10Cr Mo910 |
3059 |
S1 622-440 |
|
|
STHA25 |
A199 |
T5 |
STBA25 |
- |
- |
- |
- |
|
|
STHA26 |
A199 |
T9 |
STBA26 |
- |
- |
- |
- |
|
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