Title:
BLACK HEART MALLEABLE CAST IRON AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2021/177454
Kind Code:
A1
Abstract:
A black heart malleable cast iron according to one embodiment of the present invention comprises a ferrite matrix and graphite aggregates contained in the matrix, while containing, in terms of the mass ratio, from 50 ppm to 100 ppm of boron and from 65 ppm to 200 ppm of nitrogen. With respect to this black heart malleable cast iron, the crystal grain size number of the matrix is from 8.0 to 10.0, said crystal grain size number being obtained by quantifying the grain size of the matrix by comparing the metal structure photograph thereof with the standard diagram of crystal grain sizes.
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Inventors:
GOTO RYO (JP)
Application Number:
PCT/JP2021/008746
Publication Date:
September 10, 2021
Filing Date:
March 05, 2021
Export Citation:
Assignee:
HITACHI METALS LTD (JP)
International Classes:
C21D5/00; C21D5/14; C22C37/00
Domestic Patent References:
| WO2018180424A1 | 2018-10-04 | |||
| WO2016194377A1 | 2016-12-08 |
Foreign References:
| JPH02290944A | 1990-11-30 |
Attorney, Agent or Firm:
YAMAO, Norihito (JP)
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