US2017088923A1PendingUtilityA1

Nickel-free austenitic stainless steel

39
Assignee: SWATCH GROUP RES & DEV LTDPriority: Sep 25, 2015Filed: Jul 20, 2016Published: Mar 30, 2017
Est. expirySep 25, 2035(~9.2 yrs left)· nominal 20-yr term from priority
Inventors:Joel PorretGuido PlankertTommy Carozzani
C22C 38/38A44C 27/003C22C 38/20C22C 38/001C22C 38/22C21D 6/002C22C 38/06C21D 6/005C22C 38/04C22C 38/02C22C 38/58C22C 38/54C22C 38/50C22C 38/34C22C 38/30C22C 38/28C22C 38/26C22C 38/24C22C 38/52C22C 38/48C22C 38/46C22C 38/44C22C 38/42C22C 38/60C22C 38/32C21D 2211/001C22C 38/005C22C 38/002
39
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Claims

Abstract

Nickel-free austenitic stainless steel comprising, in mass percent: chromium in amounts of 10<Cr<21%; manganese in amounts of 10<Mn<20%; molybdenum in amounts of 0<Mo<2.5%; copper in amounts of 0.5≦Cu<4%; carbon in amounts of 0.15<C<<%; nitrogen in amounts of 0<N≦1, and the remainder being formed by iron and any impurities from the melt.

Claims

exact text as granted — not AI-modified
1 . A nickel-free austenitic stainless steel comprising, in mass percent:
 chromium in amounts of 10<Cr<21%;   manganese in amounts of 10<Mn<20%;   molybdenum in amounts of 0<Mo<2.5%;   copper in amounts of 0.5≦Cu<4%   carbon in amounts of 0.15<C<1%;   nitrogen in amounts of 0<N≦1, and   nickel in amounts of 0≦Ni<0.5%,   the nickel-free austenitic stainless steel comprising, in mass percent, carbon in amounts of 0.25<C<1% when the steel includes manganese in amounts of 15≦Mn<20%,   the remainder being formed by iron and any impurities from the melt.   
     
     
         2 . The nickel-free austenitic stainless steel according to  claim 1 , wherein the steel comprises in mass percent:
 chromium in amounts of 15<Cr<21%;   manganese in amounts of 10<Mn<20%;   molybdenum in amounts of 0<Mo<2.5%;   copper in amounts of 0.5≦Cu<4%;   carbon in amounts of 0.15%<C<1%;   nitrogen in amounts of 0<N≦1;   silicon in amounts of 0≦Si<2%,   nickel in amounts of 0≦Ni<0.5%,   tungsten in amounts of 0≦W<4%,   aluminium in amounts of 0≦Al<3%, and   the remainder formed by iron and any impurities from the melt.   
     
     
         3 . The nickel-free austenitic stainless steel according to  claim 1 , having a composition, expressed in mass percent, given by the formula Fe-17Cr-11Mn-2Mo-1Cu-0.25C-0.4N. 
     
     
         4 . The nickel-free austenitic stainless steel according to  claim 2 , having a composition, expressed in mass percent, given by the formula Fe-17Cr-11Mn-2Mo-1Cu-0.25C-0.4N. 
     
     
         5 . The nickel-free austenitic stainless steel according to  claim 1 , having a composition, expressed in mass percent, given by the formula Fe-17Cr-12Mn-2Mo-2Cu-0.33C-0.4N. 
     
     
         6 . The nickel-free austenitic stainless steel according to  claim 2 , having a composition, expressed in mass percent, given by the formula Fe-17Cr-12Mn-2Mo-2Cu-0.33C-0.4N. 
     
     
         7 . The nickel-free austenitic stainless steel according to  claim 1 , having a composition, expressed in mass percent, given by the formula Fe-17Cr-14.5Mn-2Mo-2Cu-0.22C-0.35N. 
     
     
         8 . The nickel-free austenitic stainless steel according to  claim 2 , having a composition, expressed in mass percent, given by the formula Fe-17Cr-14.5Mn-2Mo-2Cu-0.22C-0.35N. 
     
     
         9 . The nickel-free austenitic stainless steel according to  claim 1 , having a composition, expressed in mass percent, given by the formula Fe-17Cr-17Mn-2Mo-1Cu-0.3C-0.5N. 
     
     
         10 . The nickel-free austenitic stainless steel according to  claim 2 , having a composition, expressed in mass percent, given by the formula Fe-17Cr-17Mn-2Mo-1Cu-0.3C-0.5N. 
     
     
         11 . The nickel-free austenitic stainless steel according to  claim 1 , comprising mass percentages of copper in amounts of 0.5≦Cu<4%. 
     
     
         12 . The nickel-free austenitic stainless steel according to  claim 2 , comprising mass percentages of copper in amounts of 0.5≦Cu<4%. 
     
     
         13 . The nickel-free austenitic stainless steel according to  claim 1 , comprising mass percentages of carbon in amounts of 0.2≦C<1%. 
     
     
         14 . The nickel-free austenitic stainless steel according to  claim 2 , comprising mass percentages of carbon in amounts of 0.2≦C<1%. 
     
     
         15 . The nickel-free austenitic stainless steel according to  claim 11 , comprising mass percentages of carbon in amounts of 0.2≦C<1%. 
     
     
         16 . The nickel-free austenitic stainless steel according to  claim 12 , comprising mass percentages of carbon in amounts of 0.2≦C<1%. 
     
     
         17 . The nickel-free austenitic stainless steel according to  claim 1 , comprising mass percentages of molybdenum in amounts of 1≦Mo≦2%. 
     
     
         18 . The nickel-free austenitic stainless steel according to  claim 2 , comprising mass percentages of molybdenum in amounts of 1≦Mo≦2%. 
     
     
         19 . The nickel-free austenitic stainless steel according to  claim 11 , comprising mass percentages of molybdenum in amounts of 1≦Mo≦2%. 
     
     
         20 . The nickel-free austenitic stainless steel according to  claim 12 , comprising mass percentages of molybdenum in amounts of 1≦Mo≦2%. 
     
     
         21 . The nickel-free austenitic stainless steel according to  claim 13 , comprising mass percentages of molybdenum in amounts of 1≦Mo≦2%. 
     
     
         22 . The nickel-free austenitic stainless steel according to  claim 14 , comprising mass percentages of molybdenum in amounts of 1≦Mo≦2%. 
     
     
         23 . The nickel-free austenitic stainless steel according to  claim 15 , comprising mass percentages of molybdenum in amounts of 1≦Mo≦2%. 
     
     
         24 . The nickel-free austenitic stainless steel according to  claim 16 , comprising mass percentages of molybdenum in amounts of 1≦Mo≦2%. 
     
     
         25 . The nickel-free stainless steel according to  claim 1 , containing at least one element from among S, Pb, B, Bi, P, Te, Se, Nb, V, Ti, Zr, Hf, Ce, Ca, Co, Mg which may each be present in a mass concentration of up to 1%. 
     
     
         26 . The nickel-free stainless steel according to  claim 2 , containing at least one element from among S, Pb, B, Bi, P, Te, Se, Nb, V, Ti, Zr, Hf, Ce, Ca, Co, Mg which may each be present in a mass concentration of up to 1%. 
     
     
         27 . Timepieces and pieces of jewellery made of nickel-free austenitic stainless steel according to  claim 1 . 
     
     
         28 . Timepieces and pieces of jewellery made of nickel-free austenitic stainless steel according to  claim 2 .

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