Zircaloy-4 alloy having uniform and nodular corrosion resistance
원문보기
IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0933263
(1992-08-21)
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발명자
/ 주소 |
- Worcester Samuel A. (Butte MT) Dougherty James P. (Hooper UT) Foster John P. (Monroeville PA)
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출원인 / 주소 |
- Westinghouse Electric Corp. (Pittsburgh PA 02)
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인용정보 |
피인용 횟수 :
5 인용 특허 :
0 |
초록
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This is an improved method of fabricating Zircaloy-4 strip. The method is of the type wherein Zircaloy-4 material is vacuum melted, forged, hot reduced, beta-annealed, quenched, hot rolled, subjected to a post-hot-roll anneal and then reduced by at least two cold rolling steps, including a final col
This is an improved method of fabricating Zircaloy-4 strip. The method is of the type wherein Zircaloy-4 material is vacuum melted, forged, hot reduced, beta-annealed, quenched, hot rolled, subjected to a post-hot-roll anneal and then reduced by at least two cold rolling steps, including a final cold rolling to final size, with intermediate annealing between the cold rolling steps and with a final anneal after the last cold rolling step. The improvement comprises: (a) utilizing a maximum processing temperature of 620°C. between the quenching and the final cold rolling to final size; (b) utilizing a maximum intermediate annealing temperature of 520°C.; and (c) utilizing hot rolling, post-hot-roll annealing, intermediate annealing and final annealing time-temperature combinations to give an A parameter of between 4×10-19 and 7×10-18 hour, where segment parameters are calculated for the hot rolling step and each annealing step, the segment parameters are calculated by taking the time, in hours, for which that step is performed, to the (-40,000/T) power, in which T is the temperature, in degrees K, at which the step is performed, and where the A parameter is the sum of the segment parameters. Preferably, the hot rolling and the post-hot-roll anneal are at 560°-620°C. and are for 1.5-3 hours and the intermediate annealing is at 400°-520°C. and is for 1.5-15 hours and the final anneal after the last cold rolling step is at 560°-710°C. for 1-5 hours, and the beta-anneal is at 1015°-1130°C. for 2-30 minutes.
대표청구항
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A zirconium alloy strip having: a composition comprising, by weight percent, about 1.2-1.7% Sn, about 0.18-0.24% Fe, about 0.07-0.13% Cr, and balance substantially zirconium; and having a uniform corrosion rate at 400°C. of less than 2 mg/dm/day and a modular corrosion rate after one day at 500°C. o
A zirconium alloy strip having: a composition comprising, by weight percent, about 1.2-1.7% Sn, about 0.18-0.24% Fe, about 0.07-0.13% Cr, and balance substantially zirconium; and having a uniform corrosion rate at 400°C. of less than 2 mg/dm/day and a modular corrosion rate after one day at 500°C. of less than 100 mg/dm2.
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Adamson Ronald B. (Fremont CA) Potts Gerald A. (Wilmington NC), Method of fabricating zircaloy tubing having high resistance to crack propagation.
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