JIS G3429 specifications apply to seamless steel pipes
JIS G3429 seamless steel pipe is used to manufacture seamless steel gas cylinders specified in JIS B 8230 and JIS B 8241.
JIS G3429 manufacturing method:
(1) Manufactured using open hearth or electric furnace (seamless).
(2) The pipe is manufactured without heat treatment.
Chemical Composition:
| Class |
C |
Si |
Mn |
P |
S |
Ni |
Cr |
Mo |
| STH11 |
0.50 max |
0.10~0.35 |
1.80 max |
0.035max |
0.035max |
- |
- |
- |
| STH12 |
0.30~0.41 |
0.10~0.35 |
1.35~1.70 |
0.030max |
0.030max |
- |
- |
- |
|
STH21
|
0.25~0.35
|
0.15~0.35
|
0.40~0.90
|
0.030max
|
0.030max
|
0.25 max
|
0.80~1.20
|
0.15~0.30
|
|
STH22
|
0.33~0.38
|
0.15~0.35
|
0.40~0.90
|
0.030max
|
0.030max
|
0.25 max
|
0.80~1.20
|
0.15~0.30
|
| STH31 |
0.35~0.40 |
0.10~0.50 |
1.20~1.50 |
0.030max |
0.030max |
0.50~1.00 |
0.30~0.60 |
0.15~0.25 |
Tolerances：
| Tolerance on outside diameter |
Tolerance on wall thickness |
Tolerance on wall thickness disparity |
Tolerance on length |
| 1% |
+30% |
Within 20% of the nominal wall thickness |
>+30mm
0
|
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