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Preferred metal material for high-purity gas systems: stainless steel material.

Stainless steel materials have become the material of choice for high-purity gas systems due to their corrosion and oxidation resistance. 316L stainless steel is the most versatile because it resists intergranular corrosion after welding or stress relief. In order to ensure the performance of fluid products, material composition content and impurity control are one of the key factors, which directly affect the ductility, corrosion resistance and post-welding performance of fluid products after processing.

1. Chromium Cr - Chromium Cr content with high oxidation resistance and corrosion resistance can ensure the formation of chromium oxide layer thickness on the surface of stainless steel and improve corrosion resistance.

2. Nickel Ni - stable austenite structure and high ductility. Nickel Ni content can stabilize the austenite structure and ensure the ductility of stainless steel in a wider temperature range and different fluid media.

3. Carbon C - intergranular corrosion. The low carbon C content of carbides can prevent intergranular corrosion and prevent the precipitation of carbides after welding.

4. Sulfur S - Welding performance, low sulfur S content in sulfide, and at the same time, the sulfur S content in the material is within a narrow variation range, so as to ensure a high-quality weld shape, with neither depression nor bulge, forming a real welding inner wall Complete penetration is an inevitable requirement for high-purity applications. Only consistent semiconductor-grade welding quality can meet the efficient and high-quality production and construction of semiconductor engineering construction.

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