1. Carbon spring steel and alloy spring steel are different in carbon content and alloy elements, so the heating temperature and tempering temperature must be determined according to the specific brand and the final technical requirements, and the holding time should be determined according to the size of the spring.

Second, according to the production process:

1, production method of cold-drawn steel wire coil

This production method is usually applied to springs with steel wire diameter less than 8 mm, and the springs are made of cold rolling. Because the steel wire has been strengthened, it only needs 250~300 annealing after cold rolling.

2, hot coil spring, leaf spring production method

This production method is usually applied to large springs, which are made of hot coils and need to be quenched and tempered at medium temperature after forming. Tempering temperature is generally 420~520℃.