Stainless mold steel with lower delta ferrite content

Abstract

STAINLESS MOLD STEEL WITH LOWER DELTA-FERRITE CONTENT comprising a composition of alloying elements consisting essentially of, in percentage by mass, Carbon between 0.01 and 0.20; Nitrogen between 0.01 and 0.07; Manganese between 2.0 and 4.0; Nickel between 0.01 and 1.0; Chromium between 11.0 and 13.0; Molybdenum+Tungsten lower than 1.0; Copper between 0.01 and 1.5; Vanadium between 0.01 and 1.0; Sulfur between 0.01 and 0.20; Calcium at maximum 0.01; Aluminum lower than 0.05; Silicon lower than 1.0; the remainder consisting essentially of Fe and inevitable impurities to the preparation process.

1 - 9 . (canceled) 
     
     
         10 . STAINLESS MOLD STEEL WITH LOWER DELTA-FERRITE CONTENT, comprising a composition of alloying elements consisting essentially of, in percentage by mass, Carbon between 0.01 and 0.20; Nitrogen between 0.01 and 0.07; Manganese between 2.0 and 4.0; Nickel between 0.01 and 1.0; Chromium between 11.0 and 13.0; Molybdenum+Tungsten lower than 1.0; Copper between 0.01 and 1.5; Vanadium between 0.01 and 1.0; Sulfur between 0.01 and 0.2; Calcium at maximum 0.01; Aluminum lower than 0.50; Silicon lower than 1.0; the remainder consisting essentially of Fe and inevitable impurities to the preparation process. 
     
     
         11 . STAINLESS MOLD STEEL WITH LOWER DELTA-FERRITE CONTENT, according to  claim 10 , comprising a composition of alloying elements consisting essentially of, in percentage by mass, Carbon between 0.03 and 0.10; Nitrogen between 0.03 and 0.06; Manganese between 2.2 and 3.0; Nickel between 0.10 and 0.5; Chromium between 11.0 and 13.0; Molybdenum+Tungsten lower than 0.5; Copper between 0.1 and 0.8; Vanadium between 0.02 and 0.10; Sulfur between 0.05 and 0.14; Calcium between 0.01 and 0.003; Aluminum lower than 0.10; Silicon lower than 0.50; the remainder consisting essentially of Fe and inevitable impurities to the preparation process. 
     
     
         12 . STAINLESS MOLD STEEL WITH LOWER DELTA-FERRITE CONTENT, according to  claim 11 , comprising a composition of alloying elements consisting essentially of, in percentage by mass, Carbon between 0.03 and 0.08; Nitrogen between 0.03 and 0.06; Manganese between 2.2 and 2.8; Nickel between 0.10 and 0.50; Chromium between 11.5 and 12.5; Molybdenum+Tungsten lower than 0.1; Copper between 0.3 and 0.7; Vanadium between 0.03 and 0.08; Sulfur between 0.08 and 0.12; Calcium between 0.0015 and 0.0025; Aluminum lower than 0.05; Silicon lower than 0.50; the remainder consisting essentially of Fe and inevitable impurities to the preparation process. 
     
     
         13 . STAINLESS MOLD STEEL WITH LOWER DELTA-FERRITE CONTENT according to  claim 10 , wherein Vanadium is replaced with Niobium or Titanium in a ratio corresponding to 1V:2Nb and 1V:1 Ti. 
     
     
         14 . STAINLESS MOLD STEEL WITH LOWER DELTA-FERRITE CONTENT according to  claim 10 , wherein delta-ferrite content in the microstructure is lower than 10%. 
     
     
         15 . STAINLESS MOLD STEEL WITH LOWER DELTA-FERRITE CONTENT according to  claim 10 , wherein the stainless mold steed is homogenized, forged or hot rolled at temperatures higher than 1160° C., but with delta-ferrite content in the microstructure lower than 10%. 
     
     
         16 . STAINLESS MOLD STEEL WITH LOWER DELTA-FERRITE CONTENT according to  claim 10 , wherein the stainless mold steel is applicable to molds, dies and multiple-use tools, for formation of solid or liquid materials, at room temperature or at temperatures up to 1300° C. 
     
     
         17 . STAINLESS MOLD STEEL WITH LOWER DELTA-FERRITE CONTENT according to  claim 16 , wherein the stainless mold steel is applicable to plastic molds and plastic mold components. 
     
     
         18 . STAINLESS MOLD STEEL WITH LOWER DELTA-FERRITE CONTENT according to  claim 17 , wherein the stainless mold steel is applicable to hot chambers or other devices of plastic molds, in which high corrosion resistance and high machinability are required.