Steel 65G details and requirements of high wear resistance, and parts operating without impact. Analogue of foreign steel 66Mn4.
up to 60mm
Steel 60S2A heavily loaded disc springs. Foreign analogue 56Si7.
up to 20mm
ГОСТ 19903-2015, ГОСТ 5950-2000
Spring steel is a low alloy, medium carbon or high carbon steel with a very high yield strength. This allows products made of spring steel to return to its original shape despite significant bending and twisting.
Most spring steels (as those used in cars) are hardened and tempered to a value of 45 on the C scale of Rockwell.