Title:
METHOD FOR MANUFACTURING STEEL STRIP FOR BLADE, AND STEEL STRIP FOR BLADE
Document Type and Number:
WIPO Patent Application WO/2018/212155
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a method for manufacturing a steel strip for a blade having good productivity that can control carbide density in a suitable range without adding costly Mo, and a steel strip for a blade. Provided is a method for manufacturing a steel strip for a blade that includes in percent by mass, 0.55 – 0.80% C, 1.0% or less Si, 1.0% or less Mn, and 12.0 – 14.0% Cr with the remainder being Fe and inevitable impurities, said method including a batch annealing step for annealing material for cold rolling having the aforementioned metal composition in a batch annealing furnace and a cold rolling step for forming a steel strip by performing cold rolling one or more times on the material for cold rolling that has been batch annealed. The batch annealing step includes a first uniform temperature step for maintaining heating for 1 – 12 hours at an internal furnace temperature exceeding 450°C and less than 770°C and a second uniform temperature step, carried out after the first uniform temperature step, for maintaining heating for 1 – 16 hours at an internal furnace temperature exceeding 770°C and less than 900°C. Also provided is a steel strip for a plate.
Inventors:
SENOO WATARU (JP)
Application Number:
PCT/JP2018/018685
Publication Date:
November 22, 2018
Filing Date:
May 15, 2018
Export Citation:
Assignee:
HITACHI METALS LTD (JP)
International Classes:
C21D9/46; C22C38/00; C22C38/18; C22C38/28
Domestic Patent References:
| WO2014162997A1 | 2014-10-09 |
Foreign References:
| JPH0539547A | 1993-02-19 | |||
| JPH06145907A | 1994-05-27 | |||
| JP2007224405A | 2007-09-06 | |||
| JPH0920923A | 1997-01-21 | |||
| JPH06145907A | 1994-05-27 |
Other References:
See also references of EP 3626842A4
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