EP 0508574 A1 19921014 - Martensitic stainless steel article and method for producing the same.
Title (en)
Martensitic stainless steel article and method for producing the same.
Title (de)
Gegenstand aus martensitisches rostfreies Stahl und Verfahren zu ihrer Herstellung.
Title (fr)
Article en acier martensitique inoxydable et procédé pour sa fabrication.
Publication
Application
Priority
US 68382591 A 19910411
Abstract (en)
A martensitic stainless steel having an improved combination of strength, toughness, corrosion resistance and machinability, and particularly adapted for use in the manufacture of holder blocks, frames, backers and similar articles for anchoring molds and dies. The steel has a hardness within the range of 30 to 40 HRC and is consisting of, in weight percent, up to 0.09% carbon, up to 0.09% nitrogen, 0.02 to 0.09% carbon plus nitrogen, up to 4.50% manganes, up to 0.05% phosporus, 0.05 to 0.25% sulfur, up to 1.0% silicon, 1.00 to 4.00% nickel, 11.00 to 14.00% chromium, 0.25 to 1.00% molybdenum, up to 1.00% copper, balance iron and incidental impurities. Articles made from this steel may be austenitized at temperatures within the range of 1500 to 1750 DEG F for about 1 hour per inch of thickness and either oil quenched or air cooled to achieve a martensitic structure. Thereafter, the article may be tempered or stress-relieved at a temperature between 500 and 850 DEG F for about 1 hour per inch of thickness with a minimum of 2 hours. After these heat treatments, the article will exhibit a hardness between 30 and 40 HRC, preferably 35 to 40 HRC for higher strength applications, along with a drill machinability rating equal to or greater than 100. <IMAGE>
IPC 1-7
IPC 8 full level
C21D 6/00 (2006.01); C22C 38/00 (2006.01); C22C 38/44 (2006.01)
CPC (source: EP)
C22C 38/44 (2013.01)
Citation (search report)
- [X] EP 0170598 A1 19860205 - UGINE ACIERS [FR]
- [Y] FR 1478469 A 19670428 - CRUCIBLE STEEL CO AMERICA
- [YD] US 3720545 A 19730313 - STEVEN G, et al
- [A] EP 0039052 A1 19811104 - TOKYO SHIBAURA ELECTRIC CO [JP]
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 0508574 A1 19921014; CA 2061765 A1 19921012; JP H05171366 A 19930709; MX 9201431 A 19921001
DOCDB simple family (application)
EP 92301473 A 19920221; CA 2061765 A 19920224; JP 11672392 A 19920410; MX 9201431 A 19920330