Method for bonding stainless steel members and stainless steel
First Claim
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1. A stainless steel comprising:
- a first austenitic stainless steel member; and
a second austenitic stainless steel member, wherein;
at least one of the first and second austenitic stainless steel members is substantially composed of martensite by transforming the at least one of the first and second austenitic stainless steel members into martensite by performing rolling at a temperature that is equal to an Md point or lower;
the Md point is a temperature at or below which martensite transformation is achieved by processing; and
the first and second austenitic stainless steel members are bonded together by contacting the first austenitic stainless steel member with the second austenitic stainless steel member and heating the first and second austenitic stainless steel members to an As temperature or higher and a re-crystallization initiation temperature plus 100 degrees C. or lower after the contacting.
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Abstract
A method for bonding stainless steel members includes: contacting a first stainless steel member with a second stainless steel member that has a strain exceeding 50% reduction; and heating the first and second stainless steel members to a re-crystallization initiation temperature or higher, after the contacting.
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Citations
20 Claims
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1. A stainless steel comprising:
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a first austenitic stainless steel member; and a second austenitic stainless steel member, wherein; at least one of the first and second austenitic stainless steel members is substantially composed of martensite by transforming the at least one of the first and second austenitic stainless steel members into martensite by performing rolling at a temperature that is equal to an Md point or lower; the Md point is a temperature at or below which martensite transformation is achieved by processing; and the first and second austenitic stainless steel members are bonded together by contacting the first austenitic stainless steel member with the second austenitic stainless steel member and heating the first and second austenitic stainless steel members to an As temperature or higher and a re-crystallization initiation temperature plus 100 degrees C. or lower after the contacting. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A stainless steel comprising:
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a first austenitic stainless steel member comprising at least 30 volume % of martensite; and a second austenitic stainless steel member that is substantially composed of martensite, wherein; the second austenitic stainless steel member is substantially composed of martensite by transforming the second austenitic stainless steel member into martensite by performing rolling at a temperature that is equal to an Md point or lower; the Md point is a temperature at or below which martensite transformation is achieved by processing; and the first and second austenitic stainless steel members are bonded together by contacting the first austenitic stainless steel member with the second austenitic stainless steel member and heating the first and second austenitic stainless steel members to an As temperature or higher and a re-crystallization initiation temperature plus 100 degrees C. or lower after the contacting. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification