JIS G3429 Specifications for Seamless Steel Pipes
JIS G3429 seamless steel pipes are specifically designed for the production of seamless gas cylinders as outlined in JIS B 8230 and JIS B 8241. These pipes are widely used in industrial and commercial applications where high strength and durability are essential.
The manufacturing process of JIS G3429 seamless steel pipes involves the use of open hearth or electric furnaces, ensuring a high-quality, uniform structure without any seams. Importantly, the pipes are produced without heat treatment, which helps maintain their mechanical properties and structural integrity.
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 |
In addition to the specifications mentioned above, JIS G3429 ensures consistent quality and performance across various applications. The standard is particularly relevant for industries that require reliable and safe storage of gases under pressure. Proper adherence to these guidelines guarantees that the final products meet the required safety and performance standards, making them suitable for both domestic and international markets.
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