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In identifying hardware products, the method is more convenient and practical exclusion of metal springs, stainless steel shrapnel, beryllium copper shrapnel generally use zinc alloy, stainless steel, iron, aluminum, copper, these five materials, zinc alloy is the most , A little high-end products will use zinc alloy, aluminum alloy as raw material, iron is generally used for less high-end products, only high-end products will use cast copper. Therefore, using a variety of methods and experience, not excluded, the rest is the correct material.

stainless steel:

Stainless steel is an alloy that is named after the nickel content, such as 304 stainless steel. There are several reference steel, 316L, 316,304,302,206,204,202,201, 304,202,201 general use is, therefore, no one can say exactly the stainless steel density. If you know the proportion of its components, calculated by the results. According to the main chemical composition is divided into chromium stainless steel, chrome-nickel stainless steel and chromium manganese nitrogen stainless steel. They are not the same density, even if the same material, but also because of the different components of the different.

304 # stainless steel - SUS304, equivalent to China's 0Cr18Ni9. The density is 7.85 g / cm3, the chemical composition (%) is: C≤0.15% Cr: 17-19% Si≤1.5% Mn≤2.0% S / P≤0.05%

Hardness 350-430HV The minimum density of 7.6G / CM3

Stainless steel surface treatment, the general is polished, polished because it can very well reflect the texture of stainless steel material. Therefore, oil seal and plating are rarely used because there is not much needed.