Stainless steel seamless tube and stainless steel tube of the detailed introduction

Stainless steel can be divided into three kinds according to the composition. Namely: 13 chrome stainless steel, 18 chrome stainless steel, 18-8 stainless steel. The numbers represent the chromium content of the steel, and 18-8 represents the mass fraction of chromium of 18% and the mass fraction of nickel is 8%. Can be said from the previous three grades of stainless steel features: cheap, general, expensive. Their carbon quality fraction is very small, probably only 0.1% or less. According to its organization state, 13 chrome stainless steel is martensitic, 18 chrome stainless steel is ferrite type, 18-8 stainless steel is austenitic type. And the stronger the future anti-rust ability. But according to the strength, the highest martensitic, followed by ferrite, austenite type of the weakest.
Above is a very rough division of the American standard steel pipe, layman is difficult to distinguish them. But there is a very simple way to distinguish, 13 chrome stainless steel and 18 chrome stainless steel will be attracted by the magnet, while the 18-8 stainless steel will not. However, the type of stainless steel increased to the extent that the rough division method was not applicable. For example, there can be hardened, there can be carburizing and nitriding, there can be solution treatment, with rapid processing, improve corrosion resistance, heat resistance and solderability and so on. In order to cope with this wide variety of requirements, little by little to change the chemical composition of stainless steel, made with different uses of stainless steel materials, these numbers are numerous of the material has been standardized, see the JIS standard. Corner slot connector (JC)
In JIS, the characteristics of the stainless steel type are now indicated by 3 digits in accordance with US standards.

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