Method for producing a heat transfer tube for steam generator using drawing, solution heat treatment, and straightening
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United States of America Patent
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Nov 26, 2019
Grant Date -
Oct 18, 2018
app pub date -
Jun 25, 2018
filing date -
Jun 28, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A method for producing a heat transfer tube for a steam generator comprises a step of providing a tube and then applying cold drawing to the tube by using a high-pressure lubricating oil of 40 MPa or more in pressure. After the step of applying cold drawing to the tube, a step of applying a solid solution heat treatment to the tube is conducted. After the step of applying a solid solution heat treatment to the tube, a step of straightening the tube by using a roll straightening machine is conducted. An offset amount of 5 mm or less is formed for at least successive three pairs of upper and lower straightening rolls of the roll straightening machine.
First Claim
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International Classification(s)
- F28D:HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTH....
- F28F:DETAILS OF HEAT-EXCHANGE OR HEAT-TRANSFER APPARATU....
- F22B:METHODS OF STEAM GENERATION; STEAM BOILERS
- B21C:MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PR....
- C22F:CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS MET....
- B21D:WORKING OR PROCESSING OF SHEET METAL OR METAL TUBE....
- C21D:MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS....
- C22C:ALLOYS
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