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US 5,855,699 AGranted
Method for manufacturing welded clad steel tube
AssigneesDaido Tokushuko Kabushiki Kaisha, Nippon Kokan Kabushiki Kaisha
InventorsMotoaki Oyama, Minoru Yuzuki, Kazuto Terai, Yuko Takeuchi, Hitoshi Hayakawa
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Abstract
In a method of the present invention for manufacturing a welded clad steel tube, an alloy including a corrosion-resisting or heat-resisting alloy is overlaid on a raw steel tube to manufacture a cold steel tube. Then, a cold or warm working is subjected to the clad steel tube. The clad steel tube is subjected to a heat treatment at a temperature exceeding a recrystallization temperature of the alloy.
Claims8
A method for manufacturing a welded clad steel tube comprising the steps of:
- cladding by welding an alloy including at least one of a corrosion-resisting and heat-resisting alloy on a raw steel tube to manufacture a clad steel tube;
- subjecting said clad steel tube to at least one of cold and warm working to said clad steel tube;
- and
- recrystallizing said alloy of said clad steel tube by subjecting said alloy to recrystallization conditions for said alloy which includes heat treating at a temperature of 1,100.degree. C.-1,150.degree. C. whereby said temperature exceeds the recrystallization temperature of said alloy.
1 more element
Dependencies are inferred from the claim text.