Method for producing clad steel pipes
AssigneesAsahi Kasei Kogyo Kabushiki Kaisha, The Japan Steel Works, Ltd.
InventorMakoto Mikarai
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Abstract
A long length clad steel pipe which is in the extremely superior metallurgically bonded state and having good qualities can be manufactured easily at an inexpensive cost by using as a base metal, a carbon steel including a low alloyed steel and as a cladding metal, a stainless steel, nickel or a nickel alloy by the steps comprising welding at least one end part of double pipes consisting of a base metal and a cladding metal, and subjecting the processed double pipes to hot rolling at a temperature between 850.degree. C. to 1300.degree. C. with a reduction ratio of at least 15% in the first step rolling.
Claims9
A method of producing clad steel pipes using a cylindrically shaped base metal member of a carbon steel and a cylindrically shaped cladding metal member selected from the group consisting of a stainless steel, nickel or a nickel alloy said method comprising:
- (a) positioning said base metal member with respect to said cladding metal member such that the cylindrical surfaces of said base metal member and said cladding metal member are opposed to each other;
- (b) welding at least one edge portion of the shorter of said base metal member or said cladding metal member to the cylindrical surface of the other of said base metal member or said cladding metal member;
- and
- (c) hot rolling, at least one time, said base metal member and said cladding metal member at a temperature of 850.degree. C.-1300.degree. C. with a reduction ratio of at least 15% in said first hot rolling.
Dependencies are inferred from the claim text.