How to identify the materials of hardware products

The most convenient and practical way to distinguish hardware products is that hardware springs, stainless steel shrapnel, and beryllium copper shrapnel generally use five materials: zinc alloy, stainless steel, iron, aluminum alloy, and copper. Zinc alloy is the most used and slightly high-end product Zinc alloy and aluminum alloy are used as raw materials. Iron is generally used for low-end products, and only high-end products use cast copper. Therefore, using various methods and experience, eliminate the wrong, and the rest is the correct material.
stainless steel:

304# stainless steel-SUS304, equivalent to 0Cr18Ni9 in our country. Density is 7.85 g/cm3, chemical composition (%): C≤0.15% Cr: 17~19% Si≤1.5% Mn≤2.0% S/P≤0.05%

Hardness 350-430HV Minimum density 7.6G/CM3

Stainless steel is an alloy, mainly named after nickel content, such as: 304 stainless steel. There are several labels for stainless steel, 316L, 316, 304, 302, 206, 204, 202, and 201. Generally, 304, 202, and 201 are commonly used. Therefore, stainless steel does not have an accurate density. If you can know the proportions of its components, you can get the result through calculation. According to the main chemical composition, it is divided into chromium stainless steel, chromium nickel stainless steel and chromium manganese nitrogen stainless steel. Their density is not the same, even if it is the same material, it will be different due to the different components.

The surface treatment of stainless steel is usually done after polishing, because after polishing, it can reflect the texture of stainless steel very well.