COLD WORKING TOOL MATERIAL AND COLD WORKING TOOL MANUFACTURING METHOD

Title:

COLD WORKING TOOL MATERIAL AND COLD WORKING TOOL MANUFACTURING METHOD

Document Type and Number:

WIPO Patent Application WO/2017/158988

Kind Code:

A1

Abstract:

Provided are a cold working tool material with which high hardness can be obtained in a broad range of tempering temperatures, and a cold working tool manufacturing method using same. The present invention is a cold working tool material comprising a steel component composition that contains, in mass%, C: 0.65-2.40%, Cr: 5.0-15.0%, Mo and W alone or combined (Mo+1/2W): 0.50-4.00%, V: 0.10-1.50%, and N: greater than 0.0300% to 0.0800%, in which martensitic structure can be adjusted by quenching, and in which, in a 90 µm long 90 µm wide region of a cross-sectional structure that does not contain carbides with equivalent circle diameters exceeding 5.0 µm, the number density of carbides A with equivalent circle diameters greater than 0.1 µm to 2.0 µm is at least 9.0 × 105/mm2 and the number density of carbides B with equivalent circle diameters greater than 0.1 µm to 0.4 µm is at least 7.5 × 105/mm2. The present invention is also a cold working tool manufacturing method in which quenching and tempering are performed on said cold working tool material.

Inventors:

SHOUJI TATSUYA (JP)
MISHIMA SETSUO (JP)
SHINJI YUKIO (JP)
KURODA KATSUFUMI (JP)

Application Number:

PCT/JP2016/088883

Publication Date:

September 21, 2017

Filing Date:

December 27, 2016

Export Citation:

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Assignee:

HITACHI METALS LTD (JP)

International Classes:

C22C38/00; C21D6/00; C21D9/00; C22C38/36; C22C38/60

Domestic Patent References:

WO2016047396A1

2016-03-31

Foreign References:

JP2012214833A	2012-11-08
JP2010007167A	2010-01-14
JP2006193790A	2006-07-27
JP2005226150A	2005-08-25
CN101487103A	2009-07-22
JP2016069728A	2016-05-09

Other References: