Powder lubricant composition and method for manufacturing seamless steel pipe
AssigneeNippon Steel & Sumitomo Metal Corporation
InventorsSumio Iida, Masami Imamura, Takayuki Fukushima
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Abstract
A powder lubricant composition according to the present invention includes 65 parts by mass to 95 parts by mass of sodium borate, and 5 parts by mass to 35 parts by mass of cryolite. A method for manufacturing a seamless steel pipe according to the present invention includes adhering the above-described powder lubricant composition to a pipe inner surface of a work piece which is piercing rolled to have a tubular shape, and elongation rolling on the work piece after the adhering of the powder lubricant composition.
Claims10
A method for manufacturing a seamless steel pipe, comprising:
- adhering a powder lubricant composition to a pipe inner surface of a work piece which is piercing rolled to have a tubular shape;
- and
- elongation rolling on the work piece after the adhering of the powder lubricant composition,
- wherein the powder lubricant composition comprises:
- sodium borate:
- 65 parts by mass to 95 parts by mass;
- cryolite:
- 5 parts by mass to 35 parts by mass;
- and
- at least one selected from the group consisting of a fatty acid sodium salt and a fatty acid calcium salt:
- 0 parts by mass to 25 parts by mass,
- wherein a total of sodium borate and cryolite is 100 parts by mass,
- and wherein a temperature of the work piece before initial rolling in the elongation rolling is 700° C. or higher and lower than 820° C.
Dependencies are inferred from the claim text.