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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 11008637 B1

PDFFull Text
Date of Patent:
May. 18, 2021

Filed:

Jan. 11, 2018

Method of producing martensitic stainless steel strip

Applicant:

Hitachi Metals, Ltd., Tokyo, JP;

Inventor:

Hiroyoshi Fujihara, Tokyo, JP;

Assignee:

Hitachi Metals, Ltd., Tokyo, JP;

Attorney:

JCIPRNET

Primary Examiner:

Alexandra M Moore

Assistant Examiner:

Austin Pollock

Int. Cl.
CPC ...
C21D 9/52 (2006.01); C21D 6/00 (2006.01); C21D 1/74 (2006.01); C22C 38/04 (2006.01); C22C 38/02 (2006.01); C21D 1/18 (2006.01); C22C 38/22 (2006.01); C21D 9/56 (2006.01); C21D 1/25 (2006.01); F27B 9/28 (2006.01); C22C 38/18 (2006.01); C21D 9/46 (2006.01); F27B 9/12 (2006.01);
U.S. Cl.
CPC ...
C21D 9/52 (2013.01); C21D 1/18 (2013.01); C21D 1/25 (2013.01); C21D 1/74 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 9/56 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/18 (2013.01); C22C 38/22 (2013.01); F27B 9/28 (2013.01); C21D 9/46 (2013.01); C21D 2211/008 (2013.01); C21D 2241/00 (2013.01); F27B 2009/122 (2013.01);
Abstract

In the method of producing a martensitic stainless steel strip, a quenching furnace of a quenching process includes at least a temperature raising unit and a holding unit. When a predetermined quenching temperature is set as T (° C.), the temperature raising unit is set to be within a temperature range of 0.7T (° C.) or higher and lower than T (° C.), and a set heating temperature on an exit side of the steel strip is set to be higher than a set heating temperature on an entry side of the steel strip when the steel strip passes through the temperature raising unit. The holding unit is set to the quenching temperature T (° C.). A time spent in the furnace by the steel strip in the temperature raising unit is equal to or longer than a time spent in the furnace by the steel strip in the holding unit.

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