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SWRH82B high-carbon steel wire rod and preparation method thereof

A high-carbon steel and wire technology, applied in the field of SWRH82B high-carbon steel wire and its preparation, can solve the problems of low purity of molten steel, poor composition uniformity, high amount of aluminum oxide inclusions, etc., to ensure that the drawing does not break, High purity, the effect of increasing the number of continuous pouring furnaces

Active Publication Date: 2021-07-02
建龙北满特殊钢有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems in the existing SWRH82B high-carbon steel wire rod production process, the number of aluminum oxide inclusions is high, the purity of molten steel is low, and the composition uniformity is poor, the present invention provides a SWRH82B high-carbon steel wire rod and its preparation method

Method used

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  • SWRH82B high-carbon steel wire rod and preparation method thereof
  • SWRH82B high-carbon steel wire rod and preparation method thereof
  • SWRH82B high-carbon steel wire rod and preparation method thereof

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Embodiment 1

[0030] This embodiment provides a preparation method of SWRH82B high-carbon steel wire rod, including primary refining process→LF refining process→continuous casting process→heating and rolling process→controlled cooling process, wherein during the primary refining process:

[0031] Converter or electric furnace is used for smelting, the C content of tapping is not less than 0.15wt%, the tapping temperature is 1620-1640°C, fusible slag is added before tapping, silicon-calcium-barium, carbon powder, and lime are added during tapping. The chemical composition of the steel type is added to the alloy to ensure that the composition in place is controlled within ±0.2%;

[0032] During LF refining:

[0033] The refining position uses carbon powder and silicon carbide powder for deoxidation in the whole process. The refining position is powered once, and lime, fluorite, diffusion deoxidizer silicon carbide, and carbon powder are added; the second power transmission is added with diffu...

Embodiment 2

[0041] The difference between this embodiment and embodiment 1 is that in the initial refining process of this embodiment:

[0042] The materials for smelting iron and steel are molten iron and steel scrap, wherein the molten iron accounts for 85wt% and the scrap steel accounts for 15wt%. Converter or electric furnace is used for production, and the temperature of molten iron is controlled above 1200°C.

[0043]In order to realize the high-efficiency production of qualified slabs by matching the furnace and machine, the primary smelting furnace must reasonably control the smelting time, prevent the molten steel from overoxidation, and control the oxygen content in the steel. Using a 4-hole Lava oxygen lance, the oxygen blowing time is controlled within 15 minutes, and the smelting time is controlled within 30-35 minutes. Effectively controlling the blowing time can ensure the normal casting of continuous casting.

[0044] The C content of the molten steel reaches more than 0....

Embodiment 3

[0048] The difference between this embodiment and embodiment 1 or 2 is that in the LF refining process of this embodiment:

[0049] In order to ensure that the refining station can quickly smelt qualified molten steel for continuous casting and pouring, the refining process is all produced using turnover ladles, and the production process is summed up for rapid temperature rise and slag formation, and the superheat is reasonably controlled at 20-28 °C.

[0050] After temperature measurement and sampling of the molten steel in place, the components in place are judged, power is sent to the refining station once, lime 1-3Kg / t, fluorite 0-1Kg / t, diffusion deoxidizer silicon carbide 0.7-0.8Kg / t, carbon powder 0.3-0.5 Kg / t; secondary power transmission plus diffusion deoxidizer silicon carbide 0.4~0.5Kg / t, carbon powder 0.2~0.3Kg / t.

[0051] Carbon powder and silicon carbide powder are used for deoxidation throughout the refining process to create an acidic slag system, and the bas...

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Abstract

The invention relates to an SWRH82B high-carbon steel wire rod and a preparation method thereof, and belongs to the technical field of steel wire rods. In order to solve the problems that in an existing SWRH82B high-carbon steel wire rod production process, the number of aluminum oxide inclusions is high, the purity of molten steel is low, and the component uniformity is poor, the invention provides the SWRH82B high-carbon steel wire rod and the preparation method thereof. The preparation method comprises a primary smelting process, an LF refining process, a continuous casting process, a heating rolling process and a controlled cooling process. According to the preparation method, through production control of a primary smelting furnace, control of a refining position slag system and reasonable continuous casting process parameters, the qualified SWRH82B wire rod is finally rolled. According to the preparation method, aluminum-free deoxidation is carried out in the whole process, so that the purity of the molten steel is higher, and the obtained molten steel and a casting blank meet the requirements of the purity and the component uniformity. The preparation method has the advantages that the efficiency is high, the cost is low, the low-power segregation index of the obtained casting blank is within 1.05, the wire rod net carbon is within the second level, the martensite is less than or equal to 1.5 level, and the drawing use can be met.

Description

technical field [0001] The invention belongs to the technical field of steel wires, and in particular relates to a SWRH82B high-carbon steel wire and a preparation method thereof. Background technique [0002] SWRH82B high-carbon steel is mainly used to manufacture high-strength and low-relaxation prestressed steel wires and steel strands. It is widely used in cement products, bridges, high-rise buildings, highways, nuclear power plants and other fields. It is usually deformed by drawing. During the production process The strain is large. In order to avoid brittle fracture during the drawing process, there are high requirements for the uniformity of the original composition of the continuous casting slab, the purity of the molten steel, the uniformity of the structure and the number of non-metallic inclusions. [0003] 200m3 SWRH82B high carbon steel continuous casting slab is usually used for wire rolling The wire rod has a large compression ratio, and many defects of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/00C22C33/04C22C38/02C22C38/04C22C38/18
CPCC21C7/06C21C7/0025C22C33/04C22C38/02C22C38/04C22C38/18Y02P10/20
Inventor 王海达陈列董贵文范世强回磊胡金海李超杨平李亮尚继民
Owner 建龙北满特殊钢有限责任公司
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