JIS G3429 Specifications for Seamless Steel Pipes
Seamless steel pipes following the JIS G3429 standard are primarily used in the production of seamless steel gas cylinders as per JIS B 8230 and JIS B 8241. These pipes are known for their robustness and suitability in high-pressure applications. The manufacturing process of JIS G3429 seamless steel pipes involves several key steps. Firstly, they are produced using an open-hearth or electric furnace, ensuring that the pipes are seamless from the outset. Additionally, these pipes do not undergo any heat treatment during production, which helps maintain their structural integrity while keeping costs relatively low. Let’s take a closer look at the chemical composition of these pipes, which plays a crucial role in determining their performance characteristics: | Class | C | Si | Mn | P | S | Ni | Cr | Mo | |---------|------|------|------|------|------|------|------|------| | STH11 | 0.50 max | 0.10-0.35 | 1.80 max | 0.035 max | 0.035 max | - | - | - | | STH12 | 0.30-0.41 | 0.10-0.35 | 1.35-1.70 | 0.030 max | 0.030 max | - | - | - | | STH21 | 0.25-0.35 | 0.15-0.35 | 0.40-0.90 | 0.030 max | 0.030 max | 0.25 max | 0.80-1.20 | 0.15-0.30 | | STH22 | 0.33-0.38 | 0.15-0.35 | 0.40-0.90 | 0.030 max | 0.030 max | 0.25 max | 0.80-1.20 | 0.15-0.30 | | STH31 | 0.35-0.40 | 0.10-0.50 | 1.20-1.50 | 0.030 max | 0.030 max | 0.50-1.00 | 0.30-0.60 | 0.15-0.25 | When it comes to tolerances, JIS G3429 seamless steel pipes adhere to specific standards to ensure consistent quality. Here's a breakdown of the tolerances involved: | 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 designed to meet rigorous industrial requirements, ensuring that the pipes perform reliably under various conditions. For instance, the tolerance on the outside diameter ensures dimensional accuracy, while the tolerance on wall thickness helps maintain uniform strength across the pipe. The tolerance on wall thickness disparity ensures consistency in wall thickness along the length of the pipe, which is vital for pressure-bearing applications. In summary, JIS G3429 seamless steel pipes are engineered to meet the stringent demands of industries such as gas cylinder manufacturing. Their precise chemical composition and adherence to strict tolerances make them a reliable choice for demanding applications.Stainless Steel Flexible Conduit
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