Linepipe Steel With Alternative Carbon Steel Compositions For Enhanced Sulfide Stress Cracking Resistance

Abstract

The present disclosure relates to methods and compositions of linepipe steels that transport one or both of crude oil and natural gas. More particularly, the present disclosure relates sulfide stress cracking resistance of carbon steels for use as linepipe in transporting crude oil and natural gas by alternative carbon steel compositions comprising relatively low-manganese contents and/or low-carbon contents, alone or in combination with hydrogen trapping precipitates.

1 . A carbon steel composition comprising: manganese in an amount of equal to less than about 1.6% by weight or less than about 1.3% by weight of the carbon steel composition. 
     
     
         2 . The carbon steel composition of  claim 1 , wherein the manganese is in a range of about 0.6% to about 1.3% by weight of the carbon steel composition. 
     
     
         3 . The carbon steel composition of  claim 1 , wherein the manganese is in a range of about 0.6% to about 1.6% by weight of the carbon steel composition. 
     
     
         4 . The carbon steel composition of  claim 1 , further comprising one or more elements selected from the group consisting of carbon, phosphorous, sulfur, silicon, aluminum, chromium, molybdenum, niobium, titanium, nitrogen, calcium, nickel, vanadium, boron, and any combination thereof. 
     
     
         5 . The carbon steel composition of  claim 4 , wherein the carbon steel comprises nickel in an amount in the range of about 0.15% to about 1.0% by weight of the carbon steel composition. 
     
     
         6 . The carbon steel composition of  claim 4 , wherein the carbon steel comprises at least carbon in an amount of 0.01% to 0.15% by weight of the carbon steel composition. 
     
     
         7 . (canceled) 
     
     
         8 . The carbon steel composition of  claim 4 , wherein the carbon steel composition comprises at least niobium in an amount of about 0.02% to about 0.10% by weight of the carbon steel composition. 
     
     
         9 . The carbon steel composition of  claim 4 , wherein the carbon steel composition comprises at least vanadium in an amount of about 0.02% to about 0.10% by weight of the carbon steel composition. 
     
     
         10 . (canceled) 
     
     
         11 . The carbon steel composition of  claim 4 , wherein the carbon steel comprises at least chromium in an amount in the range of about 0.1% to about 0.75% by weight of the carbon steel composition. 
     
     
         12 . The carbon steel composition of  claim 4 , wherein the carbon steel comprises at least boron in an amount in the range of about 0.0005% to about 0.003% by weight of the carbon steel composition. 
     
     
         13 . The carbon steel composition of  claim 4 , wherein the carbon steel comprises at least molybdenum in an amount in the range of about 0.1% to about 0.5% by weight of the carbon steel composition. 
     
     
         14 . The carbon steel composition of  claim 4 , wherein the carbon steel comprises at least titanium in an amount in the range of about 0.005% to about 0.1% by weight of the carbon steel composition. 
     
     
         15 . A carbon steel composition comprising: carbon in an amount of equal to or less than about 0.025% by weight of the carbon steel composition. 
     
     
         16 . The carbon steel composition of  claim 15 , wherein the carbon is in a range of about to about 0.025% by weight of the carbon steel composition. 
     
     
         17 . The carbon steel composition of  claim 15 , further comprising one or more elements selected from the group consisting of manganese, phosphorous, sulfur, silicon, aluminum, chromium, molybdenum, niobium, titanium, nitrogen, calcium, nickel, vanadium, boron, and any combination thereof. 
     
     
         18 . The carbon steel composition of  claim 17 , wherein the carbon steel comprises at least manganese in an amount of equal to less than about 1.6% by weight or less than about 1.3% by weight of the carbon steel composition. 
     
     
         19 . (canceled) 
     
     
         20 . The carbon steel composition of  claim 17 , wherein the manganese is in a range of about 0.6% to about 1.6% by weight of the carbon steel composition. 
     
     
         21 . The carbon steel composition of  claim 17 , wherein the carbon steel composition comprises at least niobium in an amount of about 0.02% to about 0.10% by weight of the carbon steel composition. 
     
     
         22 . The carbon steel composition of  claim 17 , wherein the carbon steel composition comprises at least vanadium in an amount of about 0.02% to about 0.10% by weight of the carbon steel composition. 
     
     
         23 . The carbon steel composition of  claim 17 , wherein the carbon steel composition comprises at least niobium and vanadium, and the combined amount of niobium and vanadium is in an amount of about 0.02% to about 0.15% by weight of the carbon steel composition. 
     
     
         24 . The carbon steel composition of  claim 17 , wherein the carbon steel comprises at least nickel in an amount in the range of about 0.15% to about 1.0% by weight of the carbon steel composition. 
     
     
         25 . The carbon steel composition of  claim 17 , wherein the carbon steel comprises at least boron in an amount in the range of about 0.0005% to about 0.003% by weight of the carbon steel composition. 
     
     
         26 . (canceled) 
     
     
         27 . The carbon steel composition of  claim 17 , wherein the carbon steel comprises at least chromium in an amount in the range of about 0.1% to about 0.75% by weight of the carbon steel composition. 
     
     
         28 . The carbon steel composition of  claim 17 , wherein the carbon steel comprises at least molybdenum in an amount in the range of about 0.1% to about 0.5% by weight of the carbon steel composition. 
     
     
         29 . The carbon steel composition of  claim 17 , wherein the carbon steel comprises at least titanium in an amount in the range of about 0.005% to about 0.1% by weight of the carbon steel composition.