US2010119403A1PendingUtilityA1

Austenitic Stainless Steel for Cold Working Suitable For Later Machining

Assignee: UGITECHPriority: Jul 27, 2001Filed: Jan 13, 2010Published: May 13, 2010

Est. expiryJul 27, 2021(expired)· nominal 20-yr term from priority

Inventors:Jean-Michael Hauser Raphael Craen

C21D 8/06C22C 38/02C22C 38/44C21D 2211/001C22C 38/58C21D 7/02C21D 7/10C22C 38/42C21D 6/004C21D 2211/005C22C 38/001C21D 2261/00

PatentIndex Score

Cited by

References

Claims

Abstract

Austenitic stainless steel for cold working suitable for later machining, characterized by the following composition by weight: carbon<0.030% 0.3%<silicon<1% 7%<manganese<9% 4.55%<nickel<7% molybdenum<0.8% 2%<copper<4% 0.02%<nitrogen<0.060% sulfur<0.01% phosphorus<0.030%

Claims

exact text as granted — not AI-modified

1 . Austenitic stainless steel for cold working suitable for later machining, characterized by the following composition by weight:
 carbon&lt;0.030%   0.3%&lt;silicon&lt;1%   7%&lt;manganese&lt;9%   4.55%&lt;nickel&lt;7%   15%&lt;chromium&lt;18%   molybdenum&lt;0.8%   2%&lt;copper&lt;4%   0.02%&lt;nitrogen&lt;0.060%   sulfur&lt;0.01%   phosphorus&lt;0.030%   
     
     
         2 . Steel as per  claim 1 , characterized in that the composition also comprises boron in a concentration below 50.10 −4 %. 
     
     
         3 . Steel as per  claim 1 , characterized in that the Md30 index, defined by the formula: Md30=551−462(C %+N %)−9.2Si %−20Mn %−13.7Cr %−29Ni %−29Cu %−18.5Mo %, is below −60. 
     
     
         4 . Steel as per  claim 1 , characterized in that the ferrite rate after reheating of the raw solidification structure to 1,240° C. is below 10%, as per the following formula: % Ferrite =0.034 x 2 +0.284x−0.347, where x=6.903 [Cr eq −Ni eq /1.029−6.998], with Cr eq =Cr % and Ni eq =Ni %+20.04 C %+21.31 N %+0.46 Cu %+0.08 Mn %.

Cited by (0)

No later patents cite this yet.

References (0)

No backward citations on record.