Method for Producing Steel Sheet for Gasket, and Gasket

Abstract

The present invention aims at providing: a method for manufacturing such a kind of gasket-oriented steel plate excellent in elasticity and formability, in a manner to allow for reduction of a breaking elongation of the steel plate to thereby improve a formability (punchability) thereof while improving a proof stress of the steel plate against a repeated stress from a discharge valve to thereby maintain a higher elasticity of the steel plate; and a gasket able to withstand the repeated stress from the discharge valve. The manufacturing method of a gasket-oriented steel plate of the present invention comprises the steps of: annealing a starting steel material having a composition of: Mn less than 0.5%, Ni less than 2.0%, and Cr less than 12.0%; and subsequently temper rolling the annealed starting steel material at a rolling reduction ratio of 10% or more; and the gasket of the present invention is formed by adopting a gasket-oriented steel plate obtained by the above manufacturing method.

1 . A manufacturing method of a gasket-oriented steel plate, comprising the steps of:
 annealing a starting steel material having a composition of: Mn less than 0.5%, Ni less than 2.0%, and Cr less than 12.0%; and   subsequently temper rolling the annealed starting steel material at a rolling reduction ratio of 10% or more.   
     
     
         2 . The manufacturing method of a gasket-oriented steel plate according to  claim 1 , further comprising the steps in the order of:
 passing the starting steel material through a hot rolling step, an acid pickling step, and a cold rolling step, before the annealing step.   
     
     
         3 . The manufacturing method of a gasket-oriented steel plate according to  claim 1 , wherein the starting steel material contains Mn in an amount of 0.3% or less. 
     
     
         4 . A gasket formed by adopting a gasket-oriented steel plate obtained by the manufacturing method of a gasket-oriented steel plate according to any one of  claim 1 .