304 stainless steel material is a common material of stainless steel, the density of 7.93 g/cm3, also called 18/8 stainless steel industry. Resistance to high temperature of 800 degrees, good corrosion resistance and rust protection, has the processing performance is good, the characteristics of high toughness of the steel must contain more than 18 percent of chromium, more than 8 percent of the nickel content, according to the ASTM standard is 304 stainless steel made a number of stainless steel.
8.8 on the Richter scale is composed of 1035 acr, 1040 acr, CH38F, 1045 acr, 1039, 10 b21, 10 b33, more than 10 b38 material can do 8.8 bolt, but easy to rust, low carbon alloy steel and medium carbon steel and the heat treatment (quenching plus tempering), can be up to 8.8 on the Richter scale strength, high strength bolt, screw tightly in kunshan precision hardware do 8.8 carbon steel and so only requires strength and hardness, and ask for a rust stainless steel 304, beautiful.