US2003021716A1PendingUtilityA1

Austenitic stainless steel for cold working suitable for later machining

Assignee: USINORPriority: Jul 27, 2001Filed: Jul 25, 2002Published: Jan 30, 2003

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

Inventors:Jean-Michel Hauser Raphael Craen

C21D 7/10C21D 2261/00C22C 38/44C22C 38/58C22C 38/001C22C 38/18C22C 38/42

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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% 5%<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%    5%&lt;manganese&lt;9%    4.55%&lt;nickel&lt;7%    15%&lt;chrome&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 +0.284 x− 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 %.

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