Q: Why does decarbonization occur in semi-finished products of annealed 35K cold heading wire?
A: protective atmosphere should be passed into the furnace. Such as nitrogen + methanol.
This is closely related to raw materials. Generally, raw materials have decarbonized layers in the diameter range of 1%. The protective atmosphere in the key furnace is very important, first of all, there must be a protective atmosphere annealing, some fastener products produce surface decarbonization, the main reason is produced in the annealing process.
