Prestressed steel strand with strength of 2100 MPa and production process
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A prestressed steel strand, 2100mpa technology, applied in the field of smelting, can solve problems such as difficult production
Inactive Publication Date: 2020-07-17
CHINA ACADEMY OF RAILWAY SCI CORP LTD +5
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Problems solved by technology
[0004] The present invention is to solve the problem that the large-scale high-carbon steel wire rod in the prior art needs to ensure the good plasticity and structure of the wire rod whi...
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Embodiment 1
[0037] A prestressed steel strand with a strength of 2100MPa, its chemical composition includes C: 0.86%, Si: 0.30%, Mn: 0.80%, Cr: 0.013%, P: 0.003%, S: 0.15%, Al: 0.032%, V: 0.037%, the rest is Fe and unavoidable impurities, and the diameter of the steel strand is 13 or 14mm.
[0038] The preferred raw material for steel strand production is air-cooled and hot-rolled wire rod with a diameter of Φ14mm and a strength of not less than 1400MPa; the preferred grade of wire rod used is QS92Si-HT, and the C content is 0.9% to 0.95%.
[0039] Such as figure 1 As shown, the production process of 2100MPa grade prestressed steel strand includes the following steps:
[0040] S1. The raw materials are sent to KR or granular magnesium desulfurization through the blast furnace molten iron, and then sent to the top-bottom combined blowing converter for smelting. After desulfurization of blast furnace molten iron, the converter adopts double slag blowing method, which can reduce the conten...
Embodiment 2
[0061] A prestressed steel strand with a strength of 2100MPa, its chemical composition includes C: 0.87%, Si: 0.60%, Mn: 0.65%, Cr: 0.011%, P: 0.002%, S: 0.30%, Al: 0.011%, V: 0.023%, the rest is Fe and unavoidable impurities, and the diameter of the steel strand is 13 or 14mm.
[0062] The preferred raw material for steel strand production is air-cooled and hot-rolled wire rod with a diameter of Φ14 mm and a strength of not less than 1200 MPa; the preferred grade of wire rod used is QS87Mn, and the C content is 0.85%-0.89%.
[0063] Such as figure 1 As shown, the production process of 2100MPa grade prestressed steel strand includes the following steps:
[0064] S1. The raw materials are sent to KR or granular magnesium desulfurization through the blast furnace molten iron, and then sent to the top-bottom combined blowing converter for smelting. After desulfurization of blast furnace molten iron, the converter adopts double slag blowing method, which can reduce the content o...
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Abstract
The invention provides a prestressed steel strand with the strength of 2100 MPa and a production process. The prestressed steel strand comprises the following chemical components of, in percentage bymass, 0.84%-0.90% of C, 0.10%-1.00% of Si, 0.30%-0.90% of Mn, 0.10%-0.50% of Cr, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.01%-0.08% of Al, 0.01%-0.10% of V, and the balance Fe and inevitable impurities. Through special component design, a wire rod obtained through the production method is segregated into quenched structures such as network carbide and martensite which are low in level, uniform in structure and free of influences on use, good plasticity is still kept while high strength is guaranteed, and the production cost is reduced by one heating, after the obtained wire rods with the specifications of 13 mm and 14 mm are subjected to drawing, stranding and stabilizing treatment, the strength of the stranded wire can reach 2000 MPa-2100 MPa and 2100 MPa-2200 MPa respectively, and the stranded wires can be used for producing high-strength prestressed steel strands with the grades of 2000 MPa and 2100 MPa respectively.
Description
technical field [0001] The invention relates to the technical field of smelting, in particular to a prestressed steel strand. Background technique [0002] At present, the national mainstream prestressed steel strand is 1860MPa grade. It has been used continuously since the 1990s and has not been upgraded. Moreover, the market capacity of prestressed steel strand is huge, and the development prospect is broad. [0003] At present, the wire rods used in the mainstream 1860MPa level prestressed steel strands use or The specification is YL82B, and the strength of the wire rod is about 1160MPa. If the strand level is increased from 1860MPa to 2000MPa and 2100MPa, the strength is increased by 140MPa and 240MPa respectively, and the strength of the corresponding raw material wire rod should be increased accordingly. It is necessary to ensure good plasticity and structure. The greater the strength is, the more difficult it is to produce. Therefore, it is imperative to invent ...
Claims
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