The most common materials are: carbon steel, stainless steel, stainless steel, copper, aluminum, etc.
Carbon steel is divided into low carbon steel (such as c1008 / C1010 / C1015 / C1018 / c1022), medium carbon steel (such as c1035), high carbon steel (c1045 / c1050), and alloy steel (SCM435 / 10B21 / 40Cr).
Generally, c1008 materials are made of ordinary grade products, such as grade 4.8 screws and ordinary grade nuts; C1015 screws are generally used for lifting rings; C1018 is generally used for machine screws, but also for self tapping screws; c1022 is generally used for self tapping screws; c1035 is used for grade 8.8 screws; c1045 / 10B21 / 40Cr for grade 10.9 screws; 40Cr / SCM435 for grade 12.9 screws.
Ss302 / SS304 / SS316 is the most common stainless steel. Of course, a large number of SS201 products are also popular now, and even products with lower nickel content are called non authentic stainless steel products; the appearance looks similar to that of stainless steel, but the corrosion resistance is quite different.