EP 4368740 A1 20240515 - FERRITIC FREE-CUTTING STAINLESS STEEL MATERIAL
Title (en)
FERRITIC FREE-CUTTING STAINLESS STEEL MATERIAL
Title (de)
FERRITISCHES, FREI SCHNEIDENDES EDELSTAHLMATERIAL
Title (fr)
MATÉRIAU EN ACIER INOXYDABLE FERRITIQUE DE DÉCOLLETAGE
Publication
Application
Priority
JP 2022177092 A 20221104
Abstract (en)
The present invention relates to a ferritic free-cutting stainless steel material having a component composition contains: in terms of mass%, 10.0%≤Cr≤25.0%, 0.2%≤Mn≤2.0%, 0.30%≤Al≤2.50%, 0.02%≤Si≤0.60%, and 0.10%≤S≤0.45%, and further two or more selected from the group consisting of 0.03%≤Pb≤0.40%, 0.03%≤Bi≤0.40%, and 0.01%≤Te≤0.10%, with a balance being Fe and unavoidable impurities. The component composition satisfies: 900([C] + [N]) + 170[Si] + 12[Cr] + 30[Mo] + 10[Al] < 300, and ([Cr] + [Mo] + 1.5[Si] + 4[Al])/([Ni] + 0.5[Mn] + 30[C] + 30[N]) ≥ 7. The ferritic free-cutting stainless steel material contains sulfides having a circle equivalent diameter of 1.5 µm or more, and the sulfides have an average circle equivalent diameter of 3.0 to 15.0 µm, an average aspect ratio of 2.5 or less, and an area ratio of 0.5 to 2.0%, and the maximum value of Vickers hardness of 170 HV or less.
IPC 8 full level
C22C 38/60 (2006.01); C21D 6/00 (2006.01); C21D 6/02 (2006.01); C21D 7/13 (2006.01); C21D 8/00 (2006.01); C21D 8/06 (2006.01); C21D 9/52 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/18 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/54 (2006.01)
CPC (source: EP US)
C21D 1/84 (2013.01 - US); C21D 6/002 (2013.01 - EP); C21D 6/004 (2013.01 - EP US); C21D 6/005 (2013.01 - US); C21D 6/008 (2013.01 - US); C21D 6/02 (2013.01 - EP); C21D 7/13 (2013.01 - EP); C21D 8/005 (2013.01 - EP); C21D 8/065 (2013.01 - EP US); C21D 9/52 (2013.01 - EP); C21D 9/525 (2013.01 - US); C22C 38/001 (2013.01 - EP US); C22C 38/002 (2013.01 - EP US); C22C 38/004 (2013.01 - EP US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/06 (2013.01 - EP US); C22C 38/18 (2013.01 - EP); C22C 38/42 (2013.01 - EP US); C22C 38/44 (2013.01 - EP US); C22C 38/54 (2013.01 - EP US); C22C 38/60 (2013.01 - EP US); C21D 2211/005 (2013.01 - US)
Citation (applicant)
- JP 2017110285 A 20170622 - DAIDO STEEL CO LTD
- JP 2022177092 A 20221130
Citation (search report)
- [X] EP 3392355 A1 20181024 - DAIDO STEEL CO LTD [JP]
- [X] FR 3097878 A1 20210101 - DAIDO STEEL CO LTD [JP]
- [A] JP 2007238981 A 20070920 - DAIDO STEEL CO LTD
- [A] JP 2017203190 A 20171116 - DAIDO STEEL CO LTD
- [A] JP H0931603 A 19970204 - DAIDO STEEL CO LTD
- [A] US 2007196160 A1 20070823 - NAKATANI YASUNORI [JP]
- [A] JP 2001198605 A 20010724 - DAIDO STEEL CO LTD
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
EP 4368740 A1 20240515; JP 2024067206 A 20240517; US 2024150881 A1 20240509
DOCDB simple family (application)
EP 23207410 A 20231102; JP 2022177092 A 20221104; US 202318384167 A 20231026