High Strength Steel

Abstract

A steel composition that includes: about 0.25-0.37% by weight Carbon; about 1.20-1.55% by weight Manganese; about 0.1-0.15% by weight Vanadium; about 0.20-0.40% by weight Nickel; about 0.20-0.50% 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.

1 . 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; up to about 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 anchor bolt 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. 
   
   
       3 . The steel anchor bolt of  claim 1 , wherein said steel anchor bolt meets the requirements of 75S steel. 
   
   
       4 . The steel anchor bolt of  claim 1 , further comprising: from above zero up to about 0.035% by weight Phosphorus. 
   
   
       5 . The steel anchor bolt of  claim 1 , further compromising: from above zero up to about 0.04% by weight Sulfur. 
   
   
       6 . The steel anchor bolt of  claim 1 , further comprising: from above zero up to about 0.06% by weight Tin. 
   
   
       7 . The steel anchor bolt of  claim 1 , further comprising: from above zero up to about 0.06% by weight Molybdenum. 
   
   
       8 . The steel anchor bolt of  claim 1  having a steel composition 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 0.20 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 anchor bolt of  claim 8 , further comprising: from above zero up to about 0.25% by weight Chromium. 
   
   
       10 . The steel anchor bolt 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 anchor bolt 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 anchor bolt of  claim 11 , further comprising: from above zero up to about 0.20% by weight Chromium. 
   
   
       13 . The steel anchor bolt 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 steel anchor bolt 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 steel anchor bolt of  claim 1 , further comprising from above zero up to about 0.025% by weight Titanium. 
   
   
       16 . The steel anchor bolt of  claim 15 , further comprising from above zero up to about 0.04% by weight Aluminum. 
   
   
       17 . The steel anchor bolt of  claim 15 , further comprising from above zero up to about 0.025% by weight Niobium. 
   
   
       18 . The steel anchor bolt of  claim 1 , further comprising from above zero up to about 0.025% by weight Niobium. 
   
   
       19 . The steel anchor bolt of  claim 18 , further comprising from above zero up to about 0.04% by weight Aluminum. 
   
   
       20 . The steel anchor bolt of  claim 1 , further comprising from above zero up to about 0.04% by weight Aluminum. 
   
   
       21 . A steel anchor bolt made by a method 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; up to about 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.degree.F. and about 1650.degree.F. 
   
   
       22 . The steel anchor bolt of  claim 21 , wherein the steel comprises a 75S steel. 
   
   
       23 . The steel anchor bolt of  claim 21  wherein the method o further comprises: (d) tempering the composition by heating at a furnace temperature between about 850.degree. F. and about 1000.degree.F. 
   
   
       24 . The steel anchor bolt of  claim 21 , wherein the normalizing step of the method comprises: charging the composition at an initial furnace temperature at about 1600.degree.F.; and lowering the furnace temperature to a furnace temperature at about 1500.degree.F. once the composition temperature approaches 1500.degree.F. 
   
   
       25 . The steel anchor bolt 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 steel anchor bolt of  claim 21 , wherein the steel composition provided is in the form of bars or ingots 
   
   
       27 . The steel anchor bolt of  claim 21 , wherein the normalizing step of the method comprises:
 charging the composition at an initial furnace temperature at about 1500.degree. F.; and   maintaining the furnace temperature at about 1500.degree.F. once the composition temperature approaches 1500.degree.F.   
   
   
       28 . The steel anchor bolt of  claim 21 , further comprising: (d) cooling the composition in air.