JIS G3429 Specifications Apply to Seamless Steel Pipes
Seamless steel pipes that comply with the JIS G3429 standard are primarily used for manufacturing seamless steel gas cylinders as outlined in JIS B 8230 and JIS B 8241. These pipes are essential components in various industrial applications where high strength and durability are required. The production process of JIS G3429 seamless steel pipes involves advanced techniques. These pipes are manufactured using an open-hearth or electric furnace process, ensuring they are seamless throughout their structure. It's worth noting that these pipes do not undergo heat treatment during manufacturing, which helps maintain their structural integrity while simplifying the production process. ### Chemical Composition: Below is a detailed breakdown of the chemical composition for different classes of JIS G3429 seamless steel pipes: | **Class** | **C** | **Si** | **Mn** | **P** | **S** | **Ni** | **Cr** | **Mo** | |-----------|----------|----------|----------|----------|----------|----------|----------|----------| | STH11 | ≤0.50 | 0.10-0.35| ≤1.80 | ≤0.035 | ≤0.035 | - | - | - | | STH12 | 0.30-0.41| 0.10-0.35| 1.35-1.70| ≤0.030 | ≤0.030 | - | - | - | | STH21 | 0.25-0.35| 0.15-0.35| 0.40-0.90| ≤0.030 | ≤0.030 | ≤0.25 | 0.80-1.20| 0.15-0.30| | STH22 | 0.33-0.38| 0.15-0.35| 0.40-0.90| ≤0.030 | ≤0.030 | ≤0.25 | 0.80-1.20| 0.15-0.30| | STH31 | 0.35-0.40| 0.10-0.50| 1.20-1.50| ≤0.030 | ≤0.030 | 0.50-1.00| 0.30-0.60| 0.15-0.25| ### Tolerances: To ensure consistent quality and performance, the following tolerances are applied to JIS G3429 seamless steel pipes: | **Tolerance on Outside Diameter** | **Tolerance on Wall Thickness** | **Tolerance on Wall Thickness Disparity** | **Tolerance on Length** | |-----------------------------------|----------------------------------|------------------------------------------|-------------------------| | ±1% | +30% | Within 20% of nominal wall thickness | >+30mm: 0 | These tolerances are crucial for maintaining the structural consistency of the pipes, especially when they are used in critical applications such as gas cylinders or other pressurized systems. In conclusion, JIS G3429 seamless steel pipes are manufactured to exacting standards, ensuring they meet the needs of industries requiring high-performance materials. Their precise chemical composition and strict tolerances make them a reliable choice for demanding applications.Body Parts
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