Hot rolling oil for steel

Abstract

The present invention relates to a composition of oil suitable for hot rolling of steel and its alloys. The oil composition forms an oil-in-water dispersion when mixed with water using proper agitation and provides adequate lubricity and load carrying capacity during rolling of steel slab/sheets.

We claim: 
     
         1 . A hot rolling oil composition comprising:
 an oil in water dispersion, wherein the oil is selected from the group consisting of a fatty oil, or a synthetic ester, or a combination thereof, and optionally a fatty acid, base oil, or a combination thereof and 1-12% w/w of sulfurized fatty oil, or sulfurized ester or a combination thereof, the hot rolling oil composition comprises 0.1 to 2.0% w/w of sulphur content in said composition, wherein the dispersion of hot rolling oil composition in water is having emulsion stability index (ESI) in the range of 0.05-0.25 and load carrying capacity of 2000-3000 lbs.   
     
     
         2 . The hot rolling oil composition of  claim 1 , wherein the total sulphur content in the composition is in the range of 1.0 to 1.1% w/w. 
     
     
         3 . The hot rolling oil composition of  claim 1 , wherein the amount of fatty oils or synthetic esters, or a combination thereof ranges from about 20% to 90% w/w of the composition. 
     
     
         4 . The hot rolling oil composition of  claim 1 , wherein the amount of fatty acids ranges from 0-15% w/w. 
     
     
         5 . The hot rolling oil composition of  claim 1 , wherein the amount of base oil ranges from 0-75% w/w. 
     
     
         6 . The hot rolling oil composition of  claim 1 , wherein a synergistic and direct correlation exists between load carrying capacity of oil i.e., Falex Jaw Load and Emulsion Stability Index (ESI) up to 0.25. 
     
     
         7 . The hot rolling oil composition of  claim 1 , wherein the friction coefficient of neat hot rolling is 0.09 to 0.12. 
     
     
         8 . The hot rolling oil composition of  claim 1 , wherein the sulfurized fatty oil is derived from palm oil, soya oil, lard oil, sunflower oil, corn oil, soybean oil, rapeseed oil, peanut oil, olive oil, canola oil, cottonseed oil, castor oil, turpentine oil, toll oil, or a combination thereof. 
     
     
         9 . The hot rolling oil composition of  claim 1 , wherein the sulfurized synthetic ester is selected from Dover Chemical's lard oil and esters selected from Base 10SE, Base 101, Mayco Base 1351, Mayco Base 1210, Sulperm 18 and Base 44, Additin 4412F, Additin RC 2310, Additin RC2410 and Additin RC2526 from RheinChemie; King Industry's fatty acid ester NA-LUBE EP-5210, NA-LUBE EP-5216, Fatty Oil Ester or Fatty oil, NA-LUBE EP-5310, NA-LUBE EP-5316, Olefins or Fatty Oil: NA-LUBE EP-5415, NA-LUBE EP-5425; Vegetable polysulfides sulfurized esters VPS 11, VPS 15 and VPS17 of Arkema, INC.; Synester SE 110 and synester SE 115 of Lubrizol. 
     
     
         10 . The hot rolling oil composition of  claim 1 , wherein the base oil is a lubricant base selected from Group I, II, III or IV base stocks or combination thereof. 
     
     
         11 . The hot rolling oil composition of  claim 1 , further comprising conventional additives such as free fatty acids like oleic acid, stearic acid, antioxidant containing amine, phenolic group and silicone containing antifoam. 
     
     
         12 . The hot rolling oil composition of  claim 1 , wherein the fatty oils are selected from palm oil, coconut oil, karanjea oil, rapeseed oil and tallow. 
     
     
         13 . The hot rolling oil composition of  claim 1 , wherein the synthetic esters are selected from butyl stearate, PEG ester, sorbitan ester, glycerol ester, TMP trioleate, pentaerytritoldioleateand tetraoleate. 
     
     
         14 . The hot rolling oil composition of  claim 1 , wherein the oil in water dispersion comprises about 5% w/w or less of the rolling oil composition of any of the preceding claims and about 95% w/w or higher of water. 
     
     
         15 . The oil in water dispersion of  claim 14 , wherein the dispersion does not contain any conventional emulsifier to make an oil in water dispersion having Emulsion Stability Index (ESI) of 0.05-0.25.