US2005214157A1PendingUtilityA1

High strength steel

26
Individually held — no corporate assignee on recordPriority: Mar 29, 2004Filed: Mar 29, 2005Published: Sep 29, 2005
Est. expiryMar 29, 2024(expired)· nominal 20-yr term from priority
Inventors:Gary StueckMichael Kan
C21D 9/0075C22C 38/42C21D 9/46C22C 38/04C22C 38/08C22C 38/46C21D 1/28C22C 38/02C21D 9/0093C22C 38/16C22C 38/12
26
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Claims

Abstract

A steel composition that includes: about 0.25-0.37% by weight Carbon; about 1.20-1.55% by weight Manganese; about 0.1-0.015% by weight Vanadium; about 0.20-0.30% by weight Nickel; about 0.30-0.50% by weight Silicon; about 0.30-0.45% by weight Copper; about 0.017-0.025% by weight Nitrogen; and Iron as the main constituent.

Claims

exact text as granted — not AI-modified
1 . A steel composition, comprising: 
 about 0.25-0.37% by weight Carbon;    about 1.20-1.55% by weight Manganese;    about 0.1-0.15% by weight Vanadium;    about 0.20-0.30% by weight Nickel;    about 0.30-0.50% by weight Silicon;    about 0.30-0.45% by weight Copper;    about 0.017-0.025% by weight Nitrogen; and    Iron as the main constituent.    
     
     
         2 . The steel composition of  claim 1 , further comprising: 
 from above zero up to about 0.30% by weight Chromium.    
     
     
         3 . The steel composition of  claim 1 , further comprising: 
 from above zero up to about 0.035% by weight Phosphorus.    
     
     
         4 . The steel composition of  claim 1 , further compromising: 
 from above zero up to about 0.04% by weight Sulfur.    
     
     
         5 . The steel composition of  claim 1 , further comprising: 
 from above zero up to about 0.06% by weight Tin.    
     
     
         6 . The steel composition of  claim 1 , further comprising: 
 from above zero up to about 0.06% by weight Molybdenum.    
     
     
         7 . The steel composition of  claim 1 , further comprising: 
 from above zero up to about 0.30% by weight Chromium;    from above zero up to about 0.035% by weight Phosphorus;    from above zero up to about 0.04% by weight Sulfur;    from above zero up to about 0.06% by weight Tin; and    from above zero up to about 0.06% by weight Molybdenum.    
     
     
         8 . The steel composition of  claim 1 , comprising: 
 about 0.30-0.34% by weight Carbon;    about 1.25-1.50% by weight Manganese;    about 0.1-0.15% by weight Vanadium;    about 0.20-0.30% by weight Nickel;    about 0.30 0-0.50% by weight Silicon;    about 0.30-0.45% by weight Copper;    about 0.018-0.022% by weight Nitrogen; and    Iron as the main constituent.    
     
     
         9 . The steel composition of  claim 8 , further comprising: 
 from above zero up to about 0.25% by weight Chromium.    
     
     
         10 . The steel composition of  claim 8 , further comprising: 
 from above zero up to about 0.25% by weight Chromium;    from above zero up to about 0.025% by weight Phosphorus;    from above zero up to about 0.04% by weight Sulfur;    from above zero up to about 0.06% by weight Tin; and    from above zero up to about 0.06% by weight Molybdenum.    
     
     
         11 . The steel composition of  claim 1 , comprising: 
 about 0.30-0.32% by weight Carbon;    about 1.35-1.45% by weight Manganese;    about 0.11-0.14% by weight by Vanadium;    about 0.20-0.30% by weight Nickel;    about 0.35-0.45% by weight Silicon;    about 0.30-0.45% by weight Copper;    about 0.019-0.021% by weight Nitrogen; and    Iron as the main constituent.    
     
     
         12 . The steel composition of  claim 11 , further comprising: 
 from above zero up to about 0.20% by weight Chromium.    
     
     
         13 . The steel composition of  claim 11 , further comprising: 
 from above zero up to about 0.20% by weight Chromium;    from above zero up to about 0.02% by weight Phosphorus;    from above zero up to about 0.02% by weight Sulfur;    from above zero up to about 0.06% by weight Tin; and    from above zero up to about 0.04% by weight Molybdenum.    
     
     
         14 . The composition of  claim 1 , further comprising 
 from above zero up to about 0.025% by weight Titanium;    from above zero up to about 0.025% by weight Niobium; and    from above zero up to about 0.04% by weight Aluminum.    
     
     
         15 . The composition of  claim 1 , further comprising from above zero up to about 0.025% by weight Titanium.  
     
     
         16 . The composition of  claim 15 , further comprising from above zero up to about 0.04% by weight Aluminum.  
     
     
         17 . The composition of  claim 15 , further comprising from above zero up to about 0.025% by weight Niobium.  
     
     
         18 . The composition of  claim 1 , further comprising from above zero up to about 0.025% by weight Niobium.  
     
     
         19 . The composition of  claim 18 , further comprising from above zero up to about 0.04% by weight Aluminum.  
     
     
         20 . The composition of  claim 1 , further comprising from above zero up to about 0.04% by weight Aluminum.  
     
     
         21 . A method of making a steel, comprising: 
 (a) providing a steel composition, comprising: 
 about 0.25-0.37% by weight Carbon;  
 about 1.20-1.55% by weight Manganese;  
 about 0.1-0.15% by weight Vanadium;  
 about 0.20-0.30% by weight Nickel;  
 about 0.30-0.50% by weight Silicon;  
 about 0.30-0.45% by weight Copper;  
 about 0.017-0.025% by weight Nitrogen; and  
 Iron as the main constituent.  
   (b) charging the composition into a furnace; and    (c) normalizing the composition by heating at a furnace temperature between about 1500° F. and about 1650° F.    
     
     
         22 . The method of  claim 21 , wherein the steel comprises a 75S steel.  
     
     
         23 . The method of  claim 21 , further comprising: 
 (d) tempering the composition by heating at a furnace temperature between about 850° F. and about 1000° F.    
     
     
         24 . The method of  claim 21 , wherein the normalizing step comprises: 
 charging the composition at an initial furnace temperature at about 1600° F.; and    lowering the furnace temperature to a furnace temperature at about 1500° F. once the composition temperature approaches 1500° F.    
     
     
         25 . The method of  claim 24 , wherein the composition is held at the initial furnace temperature for about 15 to 30 minutes, and wherein the composition is held at the second furnace temperature for about 30 to 45 minutes.  
     
     
         26 . The method of  claim 21 , wherein the steel composition provided is in the form of bars, ingots, plates, or sheets.  
     
     
         27 . The method of  claim 21 , wherein the normalizing step comprises: 
 charging the composition at an initial furnace temperature at about 1500° F.; and    maintaining the furnace temperature at about 1500° F. once the composition temperature approaches 1500° F.    
     
     
         28 . The method of  claim 21 , further comprising: 
 (d) cooling the composition in air.    
     
     
         29 . A steel anchor bolt, comprising: 
 about 0.25-0.37% by weight Carbon;    about 1.20-1.55% by weight Manganese;    about 0.1-0.15% by weight Vanadium;    about 0.20-0.30% by weight Nickel;    about 0.30-0.50% by weight Silicon;    about 0.30-0.45% by weight Copper;    about 0.017-0.025% by weight Nitrogen; and    Iron as the main constituent.    
     
     
         30 . The steel anchor bolt of  claim 29 , further comprising: 
 from above zero up to about 0.30% by weight Chromium;    from above zero up to about 0.035% by weight Phosphorus;    from above zero up to about 0.04% by weight Sulfur;    from above zero up to about 0.06% by weight Tin; and    from above zero up to about 0.06% by weight Molybdenum.    
     
     
         31 . The steel anchor bolt of  claim 29 , wherein said steel anchor bolt meets the requirements of 75S steel.

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