Screws are widely used, small screws, big world. Different electronic products, electrical products, electric products, mechanical and equipment products, etc. are not small screws. Everyone knows that screws are produced with screw wires. The screw wires are divided into iron and stainless steel.
The material of stainless steel screws is classified as Austeenians stainless steel, ferrite stainless steel, martensite stainless steel, and precipitated hardening stainless steel. The selection of stainless steel screws also has principles.
Type 410 and 416 can be treated with heat treatment. The hardness is 35-45HRC. The machine processing performance is good. Type 416 is slightly high, and it is easy to cut stainless steel.
Type 420, sulfur content R0.15%, improved mechanical performance, can be strengthened by heat treatment, maximum hardness value of 53 to 58HRC, which requires stainless steel screws with higher intensity.
Settlement of hardening stainless steel 17-4PH, PH15-7Mo, they can get higher strength than usual type 18-8 stainless steel, so they are used for corrosion resistance and high-strength bolts.
A-286, a non-standard stainless steel, has higher corrosion resistance than commonly used type 18-8 stainless steel, and has good mechanical properties when temperature increases. Used as high -strength, heat -resistant, corrosion -resistant stainless steel screws, can be used for 650 ~ 700 ° C.