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Wire rod for low-carbon, high-strength, high-toughness steel strand and its production process

A high-toughness steel and production process technology, applied in the production field of wire rods for steel strands, to achieve the effects of ensuring stability, improving tensile strength, and increasing sorbite content

Active Publication Date: 2017-03-22
张家港联峰钢铁研究所有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there is no relevant public report on the research on SWRH72B-S

Method used

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  • Wire rod for low-carbon, high-strength, high-toughness steel strand and its production process
  • Wire rod for low-carbon, high-strength, high-toughness steel strand and its production process
  • Wire rod for low-carbon, high-strength, high-toughness steel strand and its production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: In summer, the summer process is adopted for the specification Φ11.0mm. The operation process of this steel grade in the present invention is as follows:

[0024] 1) The rolling temperature is controlled at 1040-1060 °C, the temperature of the finishing rolling and the cutting and sizing mill is controlled from 900-930 °C, and the spinning temperature is controlled at 930-960 °C;

[0025] 2) Φ11.0mm production batch number is X5140811229 SWRH72B-S composition and cooling process are shown in the following table:

[0026] Chemical composition content:

[0027]

[0028] Controlled cooling process:

[0029]

[0030] Product performance: The mechanical properties of the final product Φ11.0mm SWRH72B-S are as follows:

[0031]

Embodiment 2

[0032] Embodiment 2: In winter, the low-carbon high-strength high-toughness SWRH72B-S production process includes the following steps:

[0033] 1) The starting rolling temperature is controlled at 1040-1060°C, the temperature of the finishing rolling and cutting and sizing mills is controlled from 900-930°C, and the spinning temperature is controlled at 930-960°C;

[0034] 2) The composition and cooling process of SWRH72B-S with Φ8.0mm production batch number: X6141201729 are shown in the following table:

[0035] Chemical composition content:

[0036]

[0037] Controlled cooling process:

[0038]

[0039] Product performance: The mechanical properties of Φ8.0mm SWRH72B-S are shown in the table:

[0040]

[0041] The situation cited in the present invention shows that the product has reached the technical index negotiated with the user. After using this composition system, while ensuring that the wire rod reaches the tensile strength of SWRH82B, the elongation and a...

Embodiment 3

[0043] Embodiment 3: the SWRH72B-S type wire rod produced by the present invention is compared with the existing SWRH82B type wire rod on the market, and the results obtained are shown in the table below:

[0044]

[0045] The corresponding mechanical properties of the wire rod are shown in the table below:

[0046]

[0047] The properties of steel strands processed from wire rods are shown in the table below:

[0048]

[0049] It can be concluded that the newly developed 72B-S replaces the 82B wire rod, reduces the composition of the billet by 0.10%, and keeps the alloy composition such as Si and Mn unchanged, and improves the toughness of the wire rod by reducing the C content, thereby improving the steel strand. The toughness of the wire makes the wire rod and steel strand change from the original method of reducing toughness and increasing strength to improving strength and improving product toughness.

[0050] Due to the adjustment of the composition, the effect...

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Abstract

The present invention discloses a steel strand wire rod with characteristics of low carbon, high strength and high toughness, and a production process thereof. The steel strand wire rod comprises, by weight, 0.69-0.75% of C, 0.20-0.30% of Si, 0.60-0.90% of Mn, less than or equal to 0.03% of P, less than or equal to 0.025% of S, 0.30-0.40% of Cr, 0.0010%-0.0020% of B, and the balance of Fe. According to the present invention, during the rolling control and the cooling control in the production process, the silking temperature after rolling, the cooling speed before the silking phase change, the phase change temperature interval, the phase change interval zone speed, the Stelmor roll table speed, the fan wind flow and the like are controlled, such that the product achieves the high strength while the plasticity is not reduced but increased so as to avoid the generation of the network carbide, the martensite and other abnormal structures abd ensure the uniformity of the rod structure and the mechanical property. In addition, the sorbite content of the steel strand wire rod with characteristics of high strength and high toughness of the present invention is not less than 90%, the tensile strength Rm is more than or equal to 1200 MPa, and the reduction of the cross-sectional area Z is more than or equal to 34%.

Description

technical field [0001] The invention relates to the production field of wire rods for steel strands in steelmaking enterprises, in particular to a low-carbon, high-strength, high-toughness wire rod for steel strands and a production process thereof. Background technique [0002] Steel strands are widely used in various large-span construction industries, especially 1860MPa-grade steel strands, which are used in the production of cantilever cables and cable-stayed cables of bridges, elevated arch beams of high-speed railways, stadiums and other parts. It is a high-tech product that is engineering and uses critical parts. [0003] In the 1980s and 2000s, China generally used the Japanese brand SWRH77B wire rod to produce steel strands with a strength of 1720MPa or 1670MPa. With the development of society and the advancement of technology, the country began to use the specification of φ12 in the 21st century. .5 ~ 13.0mm Japanese brand SWRH82B (hereafter referred to as 82B) as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/32C21D8/06
Inventor 马志军方元杰谷杰宋健王鲁义
Owner 张家港联峰钢铁研究所有限公司
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