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Method for preparing pre-stressed steel strand through instantaneous quenching modification

A technology of prestressed steel strands and instantaneous quenching, which is applied in the direction of manufacturing tools, heat treatment equipment, furnace types, etc., can solve the problems of low atomic activity and poor performance stability, and achieve simple preparation steps, good stability, and difficulty in dislocation Effect

Active Publication Date: 2016-08-10
天津信丰达预应力钢绞线有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention: the atomic activity of the carbon element in the raw material composition of the prestressed steel strand is low, the air mass formed by each atom cannot form a strong interaction with the dislocation, and the outside world does not need to provide a large stress. Starting dislocation, the disadvantages of poor performance stability, provides a kind of mixed smelting of Fe, C, Si and other substances into steel, fine rolling into wire rod, after washing and drying, stranding into steel rope, and then preheating, A method for preparing prestressed steel strands by secondary thermal insulation calcination, secondary lead bath cooling, cooling in ice-water mixture, ethyl acetate washing and drying

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] First, weigh 86 parts of Fe, 2 parts of C, 3 parts of Si, 3 parts of Mn, 1.0 part of P, 1.0 part of S, 1.5 parts of Cr, 0.5 parts of Ni, 1.5 parts of Cu and 0.5 parts of V in parts by weight. In a smelting furnace, smelt steel at 1950°C, and finish rolling to a wire rod with a diameter of 5 mm; then take 6 strands of the wire rod prepared above and wash them with absolute ethanol for 3 times, and then dry them naturally. Put the 6 strands of washed coil steel wire in the stranding machine and twist them into steel ropes. The twisting force is controlled to be 55MPa; Then heat up to 950°C at a rate of 8°C / min, heat-preserve and calcine for 1 hour, then heat-program at a rate of 10°C / min to 1200°C, and continue heat-preserving and calcining for 2 hours; In the process, the lead bath was cooled for 1 hour. After the steel rope was cooled to 1000°C, it was quickly placed in the lead bath at 550°C, and continued to stand in the lead bath for 25 minutes. Then the steel rope w...

example 2

[0018] First, weigh 90 parts of Fe, 1.5 parts of C, 2 parts of Si, 2 parts of Mn, 0.8 parts of P, 0.7 parts of S, 1.2 parts of Cr, 0.3 parts of Ni, 1.2 parts of Cu and 0.3 parts of V in parts by weight. In a smelting furnace, smelt steel at 1975°C, and finish rolling to a wire rod with a diameter of 5 mm; then take 6 strands of the wire rod prepared above and wash them with absolute ethanol for 4 times, and after drying naturally, Put the 6 strands of washed coil steel wire in the stranding machine, twist them into steel ropes, and control the twisting force to 58MPa; after the twisting is completed, put the steel ropes in a resistance furnace and preheat them at 675°C for 2 hours. Then heat up to 975°C at a rate of 8°C / min, heat-preserve and calcine for 2 hours, then heat-program at a rate of 10°C / min to 1250°C, and continue heat-preserving and calcining for 3 hours; In the process, the lead bath was cooled for 2 hours. After the steel rope was cooled to 1000°C, it was quickl...

example 3

[0020] First, weigh 93 parts of Fe, 1 part of C, 2 parts of Si, 1 part of Mn, 0.5 part of P, 0.5 part of S, 0.9 part of Cr, 0.1 part of Ni, 0.9 part of Cu and 0.1 part of V in parts by weight. In a smelting furnace, smelt steel at 2000°C, and finish rolling to a wire rod with a diameter of 5 mm; then take 6 strands of the wire rod prepared above and wash them with absolute ethanol for 5 times, and after drying naturally, Put the 6 strands of washed coil steel wire in the stranding machine and twist them into steel ropes. The twisting force is controlled to be 60MPa; Then heat up to 1000°C at a rate of 8°C / min, heat-preserve and calcine for 2 hours, then heat-program at a rate of 10°C / min to 1300°C, and continue heat-preserving and calcining for 3 hours; , the lead bath was cooled for 2 hours, and after the steel rope was cooled to 1000°C, it was quickly placed in a 600°C lead bath, and continued to stand in the lead bath for 30 minutes, then the steel rope was quickly taken ou...

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Abstract

The invention discloses a method for preparing a pre-stressed steel strand through instantaneous quenching modification and belongs to the technical field of pre-stressed steel strand preparation. Fe, C, Si and other matter are mixed and smelted into steel, the steel is precisely rolled into a rolled steel wire, the rolled steel wire is washed and dried and then twisted into a steel rope, preheating, secondary heat preservation calcining and secondary lead bath cooling are conducted, the material is cooled in an ice-water mixture, ethyl acetate washing and drying are conducted, and the pre-stressed steel strand is prepared. The method has the advantages that the preparation steps are simple, the atomic activity of carbon of the obtained product is higher than that of other products by 23.2% or above, and dislocation is unlikely to happen; the material performance stability is good, the hydrogen content in the steel rope is lower than 1.23 ppm, and cracks are unlikely to be generated.

Description

technical field [0001] The invention relates to a method for preparing a prestressed steel strand through instantaneous quenching modification, and belongs to the technical field of prestressed steel strand preparation. Background technique [0002] Prestressed steel strands are stranded steel cables composed of high-strength steel wires, stress-relieved (stabilized), and suitable for prestressed concrete or similar applications. High-carbon steel wire rod is used, which is cold-drawn into steel wire after surface treatment, and then a certain number of steel wires are twisted into strands according to the structure of the steel strand, and then stabilized by stress-relieving treatment. In order to prolong the durability, the steel wire can be coated or coated with metal or non-metal, such as galvanized, epoxy resin, etc. In order to increase the grip force with concrete, the surface can have nicks, etc. The mold-drawn prestressed steel strand undergoes a mold compression ...

Claims

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Application Information

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IPC IPC(8): D07B1/06C22C38/02C22C38/04C22C38/60C22C38/18C22C38/08C22C38/16C22C38/12C21D9/00C21D1/18
CPCC21D1/18C21D9/0068C22C38/02C22C38/04C22C38/08C22C38/12C22C38/16C22C38/18C22C38/60D07B1/0673D07B2201/2009D07B2205/3085D07B2401/205D07B2801/10
Inventor 袁春华盛海丰高玉刚
Owner 天津信丰达预应力钢绞线有限公司
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