Austenitic Stainless Steel

Abstract

Austenitic stainless steel with improved heat resistant and corrosion resistance, where the steel contains in weight % Carbon 0.03-0.20 Chromium 20.00-26.00 Nickel 10.00-22.00 Silicon 0.50-2.50 Maganese 0.50-2.00 Nitrogen 0.10-0.40 Sulphur <0.015 Phosphous <0.040 Rare earth metals, mainly cerium and lanthanum 0.00-0.10 and the rest being iron (Fe) and inevitable impurities.

1 . An austenitic stainless steel with improved heat resistant and corrosion resistance, wherein the steel contains in weight %
 Carbon 0.03-0.20   Chromium 20.00-26.00   Nickel 10.00-22.00   Silicon 0.50-2.50   Maganese 0.50-2.00   Nitrogen 0.10-0.40   Sulphur <0.015   Phosphous <0.040   Rare earth metals, mainly cerium and lanthanum 0.00-0.10   and the rest being iron (Fe) and inevitable impurities.   
     
     
         2 . The austenitic stainless steel according to  claim 1 , wherein the carbon content is at least 0.05 but not more than 0.10 w %. 
     
     
         3 . The austenitic stainless steel according to  claim 1 , wherein the silicon content is at least 1.20 but not more than 2.50 w %. 
     
     
         4 . The austenitic stainless steel according to  claim 1 , wherein the nitrogen content is at least 0.12 but not more than 0.20 w %. 
     
     
         5 . The austenitic stainless steel according to  claim 1 , wherein the sum of rare earth metals, mainly cerium and lanthanum, is at least 0.03 w % but not more than 0.08 w %. 
     
     
         6 . The austenitic stainless steel according to  claim 1 , wherein the chromium content is at least 24.0 but not more than 26.0 w %. 
     
     
         7 . The austenitic stainless steel according to  claim 1 , wherein the nickel content is at least 19.0 but not more than 22.0 w %. 
     
     
         8 . The austenitic stainless steel according to  claim 1 , wherein nitrogen, carbon and rare earth metal (REM) contents satisfy the relationship: 0.40%≤N+3×C+3×REM≤0.60%. 
     
     
         9 . The austenitic stainless steel according to  claim 1 , wherein the manganese content is at least 0.50 but not more than 2.00 w %. 
     
     
         10 . The austenitic stainless steel according to  claim 1 , wherein the sulphur and phosphorus content is not more than 0.010% and 0.040%, respectively. 
     
     
         11 . The austenitic stainless steel according to  claim 1 , comprising one or more of the inevitable impurities contains in weight %
 trace amounts V≤0.20%   trace amounts Co≤0.60%   trace amounts Sn≤0.05%   trace amounts As≤0.05%   trace amounts W≤0.40%   trace amounts B≤0.0050%   trace amounts Nb≤0.060%   trace amounts Cu≤0.50%   trace amounts Zr≤0.1%.   
     
     
         12 . An object comprising the stainless steel according to  claim 1 . 
     
     
         13 . (canceled) 
     
     
         14 . The object according to  claim 12 , wherein the object is selected from the group consisting of plate, sheet, strip, tube, pipe, bar and wire. 
     
     
         15 . A method, comprising using the object according to  claim 12  in a heat treatment application. 
     
     
         16 . A method, comprising placing the object according to  claim 12  in an aggressive high temperature environment.