JIS G3429 Standards Apply to 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 manufactured under strict quality control to ensure they meet the required mechanical and chemical properties for safe and efficient use in high-pressure applications.
The manufacturing process of JIS G3429 pipes follows specific procedures, including:
- Production using open hearth or electric furnace methods, ensuring a seamless structure.
- Manufacturing without heat treatment, which helps maintain the material's original 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 |
In addition to the dimensional tolerances, JIS G3429 also specifies the mechanical properties that these pipes must meet, such as tensile strength, yield strength, and elongation. These standards ensure that the pipes can withstand the stresses associated with high-pressure environments. The material selection and composition are carefully controlled to optimize performance and durability, making them ideal for gas storage and transportation systems.
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