Patent ID: 9617613
Date: 2017-04-11
CPC Classifications: B23K,C21D

Claim:
1. A method for manufacturing a ferrous material, comprising the steps of: heating the base material of a ferrous material to an A introducing an amount of a strain assuming that an M cooling the base material, on which the heating step and the strain introduction step have been carried out, to a temperature that is higher than the M inspecting the microstructure of the base material where the cooling step has been carried out so that no austenite remains in the base material, to identify at least one of martensite, ferrite and pearlite, wherein when martensite has been produced, at least an amount of a strain is introduced into the base material in the strain introduction step or an additive amount of an austenite stabilization element to the base material is increased; and when either ferrite or pearlite has been produced, either a cooling rate in the cooling step or an additive amount of an element that suppresses diffusion transformation to the base material, is increased.