Method of producing steel wire and strand for pre-stressed concrete construction |
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| 申请号 | US31971272 | 申请日 | 1972-12-29 | 公开(公告)号 | US3847002A | 公开(公告)日 | 1974-11-12 |
| 申请人 | SUZUKE METAL IND CO LTD; | 发明人 | SUZUKI A; HAGIWARA M; TERAOKA N; | ||||
| 摘要 | A method of producing steel wires and strands for pre-stressed concrete construction, with low relaxation value and excellent straightness, which comprises applying in the ordinary lowtemperature annealing range of 300*-400*C to cold drawn steel wire and strand formed therefrom containing 0.6 - 0.9 percent of carbon, a tension corresponding to 10-50 percent of the tensile strength of the cold drawn wire at room temperature and, at the same time, a bending stress so as to give 0.1-0.5 percent maximum surface strain. | ||||||
| 权利要求 | 1. A METHOD OF PRODUCING STEEL WIRE AND STRAND FOR PRESTRESSED CONCRETE CONSTRUCTION, HAVING LOW RELAXATION VALUE AND EXCELLENT STRAIGHTNESS, WHICH COMPRISES THE STEPS OF APPLYING, IN THE ORDINARY LOW-TEMPERATURE ANNEALING RANGE OF 300* - 400*C, TO COLD DRAWN STEEL WIRE AND STRAND COMPOSED THEREOF, CONTAINING 0.6 - 0.9 PERCENT OF CARBON, A TENSION CORRESPONDING TO 10 - 50 PERCENT OF THE TENSILE STRENGTH OF THE COLD DRAWN WIRE AT ROOM TEMPERATURE AND, SIMULTANEOUSLY APPLYING A BENDING STRESS SO AS TO GIVE 0.1 - 0.5 PERCENT MAXIMUM SURFACE STRAIN. 2. A method according to claim 1 in which the tension applied to the wire corresponds to 10 - 20 pErcent of the tensile strength of the wire at room temperature and in which bending stress is applied so as to give 0.4 - 0.5 percent maximum surface strain. 3. A method according to claim 1 in which the tension applied to the steel wire corresponds to 15 - 30 percent of the tensile strength of the wire and in which bending stress is applied so as to give 0.3 - 0.4 percent maximum surface strain. 4. A method according to claim 1 in which the tension applied to the steel wire corresponds to 25 - 45 percent of the tensile strength of the wire and in which bending stress is applied so as to give 0.25 - 0.45 percent maximum surface strain. 5. A method according to claim 1 in which the tension applied to the wire corresponds to 30 - 40 percent of the tensile strength of the wire and in which bending stress is applied so as to give 0.3 - 0.4 percent maximum surface strain. 6. A method according to claim 1 in which the tension applied to the wire corresponds to 35 - 45 percent of the tensile strength of the wire and in which bending stress is applied so as to give 0.2 - 0.3 percent maximum surface strain. 7. A method according to claim 1 in which the tension applied to the wire corresponds to 40 - 50 percent of the tensile strength of the wire, and in which bending stress is applied so as to give 0.1 - 0.2 percent maximum surface strain. |
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