STEEL is an alloy of iron with carbon (up to 2.14%) and associated elements (Mn, Si, P, S, Cu), which entered the steel in production. In addition to these accompanying elements contain some steel elements intentionally added, the additive elements such as Cr, W, Mo, V, Ni, etc. for the production of steel fasteners - maximum of 1.5% C.
Unalloyed and Low-carbon steel
According to DIN 17 111 with C content less than 22% are consumed in the production of nuts and bolts of lower strength classes.
carbon steel according to DIN 1654 steel for cold forming, DIN 17200 steel for quenching and tempering, DIN 17210 steel hardening. They can be divided into three groups:
Quality contant of C…0,35%, P and S…max. 0,045%
High quality contant of C…0,35%, P a S…max. 0,035%
The cold forming contant of C…0,35%, P a S…max. 0,035%, have special characteristics for cold forming.