Martensitic free cutting stainless steel

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(11)

EP 1 918 408 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	27.10.2010 Bulletin 2010/43

(43)	Date of publication A2:
	07.05.2008 Bulletin 2008/19

(21)	Application number: 07019360.2

(22)	Date of filing: 02.10.2007

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International Patent Classification (IPC):

C22C 38/34^(2006.01)
C22C 38/42^(2006.01)
C22C 38/60^(2006.01)
C22C 38/00^(2006.01)
C22C 38/22^(2006.01)
C22C 38/54^(2006.01)

C22C 38/38^(2006.01)
C22C 38/44^(2006.01)
C21D 6/00^(2006.01)
C22C 38/20^(2006.01)
C22C 38/32^(2006.01)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
	Designated Extension States:
	AL BA HR MK RS

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Priority:

03.10.2006 JP 2006271360
03.07.2007 JP 2007174797

(71)	Applicant: Daido Tokushuko Kabushiki Kaisha
	Aichi (JP)

(72)	Inventors:
	Ishikawa, Koichi Nagoya-shi Aichi 457-8545 (JP) Shimizu, Tetsuya Nagoya-shi Aichi 457-8545 (JP)

(74)	Representative: Menges, Christian Alexander et al
	Diehl & Partner GbR Augustenstr. 46 80333 München 80333 München (DE)

(54)	Martensitic free cutting stainless steel

(57) The present invention relates to a martensitic free cutting stainless steel, comprising, by weight percent: C: 0.10 to 1.20 %, Si: 0.10 to 2.00 %, Mn: 0.80 to 2.00 %, S: 0.10 to 0.30 %, Cr: 10.5 to 18.0 %, Pb: 0.03 to 0.30 %, Te: 0.01 to 0.10 %, B: 0.0005 to 0.010 %, and O: 0.005 to 0.030 %, with the remainder being substantially Fe and inevitable impurities; contents of P and N are: P: 0.005 to 0.10 %, and N: ≤ 0.050 %; wherein respective formulae of 3.0 ≤ [Mn]/[S] ≤ 15.0, 0.10 ≤ [Te]/[S], and 10 ≤ [S]/[O] ≤ 40 are satisfied; and wherein a sulfide having a circle equivalent diameter of 2.0 µm or more and an aspect ratio of 10 or less is present in a total amount of 0.50 to 10 % by area ratio.

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