Production process of high-strength pre-stressed steel strands

A high-strength steel, production process technology, applied in metal material coating process, manufacturing tools, metal processing equipment and other directions, can solve the problems of low strength of production products, immature production process, large relaxation rate, etc., to achieve surface quality Good, high tensile strength, low relaxation rate

Inactive Publication Date: 2016-02-10
GUIZHOU WIRE ROPE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, prestressed steel strands with higher strength, better toughness and lower relaxation rate are needed in China to meet the needs of road, railway and bridge construction, especially the demand for 2000MPa high-strength prestressed ste

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  • Production process of high-strength pre-stressed steel strands
  • Production process of high-strength pre-stressed steel strands
  • Production process of high-strength pre-stressed steel strands

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Embodiment Construction

[0028] Below in conjunction with embodiment the present invention is described in further detail:

[0029] Take the production of steel strands with a structure of 1×7, a diameter of 15.20mm, and a tensile strength of 2000MPa as an example:

[0030] (1) Raw material selection

[0031] Using diameter φ14mm, 82B wire rod high-carbon wire, the chemical composition of the wire rod is: C: 0.82-0.84%, S≤0.025%, P≤0.0255%, Si: 0.15-0.3%, Mn: 0.6-0.9%, Cr: 0.22-0.30%, V: 0.05-0.1%, wire rod tensile strength 1200-1250MPa, reduction of area> 30%;

[0032] (2) Wire rod surface treatment

[0033] 1) The wire rod is pickled with hydrochloric acid, and the pickling time is 420s. At the same time, in order to reduce the corrosion of the acid solution on the steel base and improve the pickling effect, when the ambient temperature is 25°C, the addition ratio of corrosion inhibitor and hydrochloric acid is 0.012-0.015; hydrochloric acid Pickling adopts five pickling tanks for pickling, and t...

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Abstract

The invention discloses a production process of high-strength pre-stressed steel strands. The produced steel strands are structurally characterized in that the steel strands are 1mm in length and 7mm in width; the diameter of the steel strands is 15.20mm; the tensile strength of the steel strands is 2000MPa; the steel strands are produced by 82B coil rod high-carbon wires with diameter phi being 14mm which serve as the raw materials; the coil rods are pickled for 420 seconds by hydrochloric acid to carry out phosphorization; the maximum speed of drawing finished coils is 4m/s; the maximum part compression ratio and the absolute deformation cannot occur in the same pass during drawing; the stabilization treatment tension of the steel strands is 44-47% of the breakage tension of the steel strands; the tempering temperature is 385+/-5 DEG C; the strength loss of the steel strands remains 1.5-3.5% so as to ensure that the steel strands obtain high relaxation resistance; the high strength loss is avoided.

Description

technical field [0001] The invention relates to a high-strength prestressed steel strand production process, which belongs to the technical field of metal product production and processing. Background technique [0002] Domestically produced 1×7—15.20-1860MPa steel strand technology has matured, the steel strand diameter is 15.28-15.36mm, and supporting facilities such as steel strand anchor specifications and models have been standardized. At present, prestressed steel strands with higher strength, better toughness and lower relaxation rate are needed in China to meet the needs of road, railway and bridge construction, especially the demand for 2000MPa high-strength prestressed steel strands is strong , but the current domestic 2000MPa grade high-strength prestressed steel strand production process is immature, and the products produced have low strength, poor toughness, and large relaxation rate, which cannot meet market needs. Contents of the invention [0003] The pur...

Claims

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Application Information

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IPC IPC(8): B21C1/04B21C43/02B21C43/04C21D8/06C23G1/08C23C22/73C22C38/24
CPCB21C1/04B21C43/02B21C43/04C21D8/065C22C38/24C23C22/73C23G1/08
Inventor 张宗前万小松江渝吴光虎胡邮邮王国平张青吴丽
Owner GUIZHOU WIRE ROPE
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