JIS G3429 Specifications for Seamless Steel Pipes
Seamless steel pipes following the JIS G3429 standard are primarily utilized in the production of seamless steel gas cylinders as outlined in JIS B 8230 and JIS B 8241. These pipes are crafted with precision to meet stringent industrial requirements. The manufacturing process of JIS G3429 seamless steel pipes involves advanced techniques such as the use of open-hearth or electric furnaces to ensure the highest quality of material production. Importantly, these pipes are manufactured without undergoing any post-production heat treatment, which helps preserve their structural integrity and mechanical properties. ### Chemical Composition: Below is a detailed breakdown of the chemical composition for different classes of JIS G3429 seamless steel pipes: | Class | C (Carbon) | Si (Silicon) | Mn (Manganese) | P (Phosphorus) | S (Sulfur) | Ni (Nickel) | Cr (Chromium) | Mo (Molybdenum) | |-------|------------|--------------|-----------------|----------------|------------|-------------|---------------|-----------------| | 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: The tolerances for JIS G3429 seamless steel pipes are carefully controlled to ensure consistent performance and reliability across various applications: | Parameter | Tolerance Specification | |---------------------------------|--------------------------------------| | Outside Diameter | ±1% | | Wall Thickness | +30% | | Wall Thickness Disparity | Within 20% of the nominal wall thickness | | Length | >+30 mm: 0 mm tolerance | These specifications reflect the commitment to quality and consistency in the production of JIS G3429 seamless steel pipes. Whether used in gas cylinders or other critical applications, these pipes are designed to perform under demanding conditions while maintaining durability and safety. The detailed chemical compositions and precise tolerances make them suitable for a wide range of industrial uses, ensuring long-term reliability and performance.Oshan Z6
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