JIANGSU TIANCHENG GROUP LIMITED
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JIS G3429 seamless steel tubes
JIS G3429 seamless steel tubes are used for the manufacture of seamless steel gas cylinders specified in JIS B 8230 and JIS B 8241.
JIS G3429 manufacture method:
(1) Manufactured in open-hearth furnace or electric furnace(Seamless).
(2) The tubes is manufactured with no 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 |
Tiancheng Group supplies JIS G3429 seamless steel tubes and other steel grades tubes for high pressure and temperature applications, if you are interested in buying seamless boiler tubes from reliable steel mills, please send an email now!