EP0348557A1
Expired / Lapsed
EP
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Soft magnetic stainless steel having good cold forgeability
Assignee: Aichi Steel Corp
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Filing: 1988-12-29
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Granted: —
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Expires: 2008-12-29
Abstract
Abstract Soft magnetic stainless steel having good cold forgeability comprising, by weight, at most 0.015 % of C, at most 0.20 % of Si, at most 0.35 % of Mn, at most 0.010 % of S, 8 to 13 % of Cr, at most 0.020 % of Al, at most 0.0070 % of O, at most 0.0100 % of N and the balance of Fe and inevitable impurities, with a proviso that C + N content is at most 0.020 %. The stainless steel can be incorporated additionally at least one of 0.03 to 0.20 % of Ti, 0.002 to 0.02 % of Ca, at most 0.30 % of Bi, at most 0.040 % of Se, 0.002 % to 0.040 % of Te, 0.02 to 0.15 % of Zr, at most 2.5 % of Mo, at most 0.50 % of Cu, at most 0.50 of Ni, at most 0.20 % of Nb and at most 0.20 % of V. The stainless steel is suitable as magnetic core materials for use in electronic fuel injection devices, electromagnetic valves, magnetic sensors, etc.
Inventors
- 👤 Yoshinobu Honkura
- 👤 Eiki Kikuchi
- 👤 Toyokatsu Usami
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 01:02
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/16; C; C22; C22C; C22C38/00; C22C38/18
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
Soft magnetic stainless steel having good cold forgeability comprising, by weight, at most 0.015 % of C, at most 0.20 % of Si, at most 0.35 % of Mn, at most 0.010 % of S, 8 to 13 % of Cr, at most 0.020 % of Al, at most 0.0070 % of O, at most 0.0100 % of N and the balance of Fe and inevitable impurities, with a proviso that C + N content is at most 0.020 %.
Claim 2
Dependent Claim
80 words
Soft magnetic stainless steel having good cold forgeability comprising, by weight, at most 0.015 % of C, at most 0.20 % of Si, at most 0.35 % of Mn, at most 0.010 % of S, 8 to 13 % of Cr, at most 0.020 % of Al, at most 0.0070 % of O, at most 0.0100 % of N and the balance of Fe and inevitable impurities, with a proviso that C + N content is at most 0.020 %.
Claim 3
Dependent Claim
20 words
The soft magnetic stainless steel as claimed in Claim 1 additionally including, by weight, 0.03 - 0.20 % of Ti.
Claim 4
Dependent Claim
55 words
The soft magnetic stainless steel as claimed in Claim 1 additionally including, by weight, a member or members selected from the group consisting of at most 2.5 % of Mo, at most 0.50 % of Cu, at most 0.50 % of Ni, at most 0.20 % of Nb and at most 0.20 % of V.
Claim 5
Dependent Claim
19 words
The soft magnetic stainless steel as claimed in Claim 3 additionally including, by weight, 0.03 - 0.20 % Ti.
Claim 6
Dependent Claim
148 words
Soft magnetic stainless steel having good cold forgeability comprising, by weight, at most 0.015 % of C, at most 0.20 % of Si, at most 0.35 % of Mn, 8 to 13 % of Cr, at most 0.020 % of Al, at most 0.0070 % of O, at most 0.0100 % of N, a member or members selected from the group consisting of 0.002 to 0.02 % of Ca, at most 0.30 % of Bi, at most 0.30 % of Pb, at most 0.040 % of S, at most 0.040 % of Se, and a member or members selected from the group consisting of 0.002 to 0.040 % of Te and 0.02 to 0.15 % of Zr where one or more of S and Se is contained, and the balance of Fe and inevitable impurities, with a proviso that C + N content is at most 0.020 %.
Claim 7
Dependent Claim
148 words
Soft magnetic stainless steel having good cold forgeability comprising, by weight, at most 0.015 % of C, at most 0.20 % of Si, at most 0.35 % of Mn, 8 to 13 % of Cr, at most 0.020 % of Al, at most 0.0070 % of O, at most 0.0100 % of N, a member or members selected from the group consisting of 0.002 to 0.02 % of Ca, at most 0.30 % of Bi, at most 0.30 % of Pb, at most 0.040 % of S, at most 0.040 % of Se, and a member or members selected from the group consisting of 0.002 to 0.040 % of Te and 0.02 to 0.15 % of Zr where one or more of S and Se is contained, and the balance of Fe and inevitable impurities, with a proviso that C + N content is at most 0.020 %.
Claim 8
Dependent Claim
20 words
The soft magnetic stainless steel as claimed in Claim 5 additionally including, by weight, 0.03 - 0.20 % of Ti.
Claim 9
Dependent Claim
55 words
The soft magnetic stainless steel as claimed in Claim 6 additionally including, by weight, a member or members selected from the group consisting of at most 2.5 % of Mo, at most 0.50 % of Cu, at most 0.50 % of Ni, at most 0.20 % of Nb and at most 0.20 % of V.
Claim 10
Dependent Claim
78 words
The soft magnetic stainless steel as claimed in any of Claims 1 to 7, wherein as far as any of the following elements is present the lower limit thereof determined by weight is: C = 0.003 Si = 0.05 Mn = 0.15 S = 0.001 Al = 0.003 O = 0.0030 N = 0.0030 Se = 0.005 Pb = 0.05 Bi = 0.05 Mo = 0.05 Cu = 0.10 Ni = 0.10 Nb = 0.05 V = 0.05
References Cited (Backward Citations)
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