Homogenization of martensitic stainless steel after remelting under a layer of slag

摘要

A method of fabricating a stainless martensitic steel includes a step of electroslag remelting of an ingot of the steel then a step of cooling the ingot. Before the skin temperature of the ingot falls below the martensitic transformation temperature Ms of the steel, the ingot from electroslag remelting is placed in a furnace with an initial temperature T0 that is then higher than the pearlitic transformation completion temperature on cooling, Ar1, of the steel, the ingot undergoing a homogenization treatment in the furnace for at least a holding time t after which the temperature of the coldest point of the ingot has reached a homogenization temperature T, the holding time t being equal to at least one hour, with the homogenization temperature T being in the range approximately 900° C. to the burning temperature of the steel.

主权项

1. A method of fabricating a stainless martensitic steel, comprising:
electroslag remelting of an ingot of said steel; cooling said ingot; placing the cooled ingot from electroslag remelting in a furnace before a temperature of a skin of said ingot falls below a martensitic transformation temperature Ms of the steel, an initial temperature T0 of the furnace being greater than a pearlite transformation completion temperature on cooling, Ar1, of said steel; and homogenization treating said ingot in said furnace for at least a holding time t after which a temperature of a coldest point of said ingot has reached a homogenization temperature T, said holding time t being equal to at least one hour, with the homogenization temperature T being in the range approximately 900° C. to a burning temperature of said steel.