Oil tempered steel wire excellent in coiling workability and method for production thereof

Abstract

An oil tempered wire, characterized in that it comprises a wire material and, formed on the surface thereof, a coating film comprising one or more inorganic salts selected from the group consisting of a sulfate, a silicate and a borate. The coating film optionally further comprises fats and oils and/or a soap exhibiting lubricity. The oil tempered wire has a coating film exhibiting satisfactory heat resistance and good lubricity and thus can secure good coiling workability even in the case of a high strength wire or a wire having a heteromorphic section.

1 . An oil tempered wire excellent in coiling workability, wherein a coating film comprising one or more inorganic salts selected from a group consisting of a sulfate, a silicate and a borate is formed on a surface of a wire material  
   
   
       2 . The oil tempered wire according to  claim 1 , wherein the inorganic salt is one or more inorganic salts selected from a group consisting of sodium silicate, potassium silicate, magnesium silicate, sodium sulfate, potassium sulfate, sodium borate and potassium borate.  
   
   
       3 . The oil tempered wire according to  claim 1 , wherein the coating film layer comprising the inorganic salt further contains a fat and oil and/or a soap having lubricity.  
   
   
       4 . The oil tempered wire according to  claim 3 , wherein the fat and oil is a wax, and the soap is one or more salts selected from sodium salts or potassium salts of stearic acid, palmitic acid, oleic acid, linoleic acid and linolenic acid.  
   
   
       5 . The oil tempered wire according to  claim 3 , wherein the coating film contains the fat and oil and/or the soap in a content of 5 to 50% by mass.  
   
   
       6 . The oil tempered wire according to  claim 1 , wherein a rust preventing oil is further applied to the surface of the coating film.  
   
   
       7 . A production method of the oil tempered wire excellent in coiling workability according to  claim 1 , comprising immersing an oil tempered wire in an aqueous solution containing one or more inorganic salts selected from a group consisting of a sulfate, a silicate and a borate for forming a coating of the aqueous solution on the wire material surface, and then drying and removing water from the coating of the aqueous solution.  
   
   
       8 . A production method of the oil tempered wire excellent in coiling workability according to  claim 2 , comprising immersing an oil tempered wire in an aqueous solution containing one or more inorganic salts selected from a group consisting of a sulfate, a silicate and a borate as well as a fat and oil and/or a soap having lubricity for forming a coating of the aqueous solution on the wire material surface, and then drying and removing water from the coating of the aqueous solution.  
   
   
       9 . The oil tempered wire according to  claim 2 , wherein the coating film layer comprising the inorganic salt further contains a fat and oil and/or a soap having lubricity.  
   
   
       10 . The oil tempered wire according to  claim 4 , wherein the coating film contains the fat and oil and/or the soap in a content of 5 to 50% by mass.  
   
   
       11 . The oil tempered wire according to  claim 2 , wherein a rust preventing oil is further applied to the surface of the coating film.  
   
   
       12 . The oil tempered wire according to  claim 3 , wherein a rust preventing oil is further applied to the surface of the coating film.  
   
   
       13 . The oil tempered wire according to  claim 4 , wherein a rust preventing oil is further applied to the surface of the coating film.  
   
   
       14 . The oil tempered wire according to  claim 5 , wherein a rust preventing oil is further applied to the surface of the coating film.  
   
   
       15 . A production method of the oil tempered wire excellent in coiling workability according to  claim 3 , comprising immersing an oil tempered wire in an aqueous solution containing one or more inorganic salts selected from a group consisting of a sulfate, a silicate and a borate as well as a fat and oil and/or a soap having lubricity for forming a coating of the aqueous solution on the wire material surface, and then drying and removing water from the coating of the aqueous solution.  
   
   
       16 . A production method of the oil tempered wire excellent in coiling workability according to  claim 4 , comprising immersing an oil tempered wire in an aqueous solution containing one or more inorganic salts selected from a group consisting of a sulfate, a silicate and a borate as well as a fat and oil and/or a soap having lubricity for forming a coating of the aqueous solution on the wire material surface, and then drying and removing water from the coating of the aqueous solution.  
   
   
       17 . A production method of the oil tempered wire excellent in coiling workability according to  claim 5 , comprising immersing an oil tempered wire in an aqueous solution containing one or more inorganic salts selected from a group consisting of a sulfate, a silicate and a borate as well as a fat and oil and/or a soap having lubricity for forming a coating of the aqueous solution on the wire material surface, and then drying and removing water from the coating of the aqueous solution.