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Control method for segregation and net carbon of 86-grade high-strength cord steel wire rod

A control method and steel wire rod technology, applied in the field of cord steel production, can solve the problems of lack of competitiveness, long process route, high cost, etc., and achieve the effects of reducing broken wires during drawing, shallow decarburization layer, and slight segregation

Active Publication Date: 2021-02-12
ZENITH STEEL GROUP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The use of two-fire material technology has the disadvantages of long process, high cost, and lack of competitiveness. For example, the Chinese patent document (application number 201910798924.3) discloses a production method for high-strength cord steel billets, in which the two-fire material process is adopted, namely The billet is rolled into a billet through the bloom, and after cooling, the billet is heated again and rolled into a 5.5 wire rod, but it has the disadvantages of long process route and high cost

Method used

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  • Control method for segregation and net carbon of 86-grade high-strength cord steel wire rod
  • Control method for segregation and net carbon of 86-grade high-strength cord steel wire rod
  • Control method for segregation and net carbon of 86-grade high-strength cord steel wire rod

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Embodiment 1-4

[0027] The control method of segregation and net carbon of grade 86 high-strength cord steel wire rod includes processes: KR molten iron pre-desulfurization process→BOF converter smelting process→LF furnace refining process→continuous casting CC process→slab surface treatment process→slab heating process→ Controlled rolling process → controlled cooling process.

[0028] Smelting product composition control: C: 0.85-0.90%, Si: 0.15-0.35%, Mn: 0.40-0.60%, P: ≤0.010%, S: ≤0.010%, Cr: ≤0.010%, Al: ≤0.005%, The rest is Fe and unavoidable impurity elements.

[0029] The hot metal is pretreated by KR hot metal, the S content is ≤0.003%, and the special clean steel scrap for the cord is used (the main components are Fe, C, Si, Mn and other unavoidable trace elements, and the total amount accounts for 10% of the total metal loading. %~30%). In addition, the converter BOF smelting adopts the "double slag" process, that is, at the end of the silicomanganese oxidation period of 4 to 5 m...

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Abstract

The invention discloses a control method for segregation and net carbon of an 86-grade high-strength cord steel wire rod. The control method comprises the following steps of: KR molten iron pre-desulfurization, BOF converter smelting, LF furnace refining, continuous casting CC, casting blank surface treatment, casting blank heating, controlled rolling and controlled cooling procedures which are carried out in sequence. The 86-grade high-strength cord steel wire rod comprises the following components in percentage by weight: 0.85-0.90% of C, 0.15-0.35% of Si, 0.40-0.60% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, less than or equal to 0.010% of Cr, less than or equal to 0.005% of Al and the balance Fe. According to the control method, the segregation and netcarbon of the wire rod are improved by combining continuous casting of small square billets with wire rolling, the period and cost are greatly reduced, the sorbitizing rate of the prepared wire rod is larger than or equal to 90%, the center segregation of the wire rod is slight, no net-shaped cementite exists in the center, and the drawing use requirements of users are met.

Description

technical field [0001] The invention belongs to the technical field of cord steel production, and specifically refers to a method for controlling segregation and mesh carbon of 86-grade high-strength cord steel wire rods. Background technique [0002] In recent years, with the rapid development of my country's automobile industry and machinery manufacturing industry, the demand for cord steel is increasing, and the product quality requirements are getting higher and higher. With the development of automobiles in the direction of light weight and green environmental protection, the strength and fatigue resistance of cord steel wires can be improved. In tires with the same total strength, the amount of cord steel wires can be reduced to reduce the weight of tires and reduce tire rolling. resistance, save energy, and reduce tire production costs. At present, high-strength cord steel grade 86 is a high-profit, high-value-added product, and has a large market capacity and good p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/18C22C33/04C21C7/06B22D11/22C21D8/06
CPCC22C38/02C22C38/04C22C38/06C22C38/18C22C33/04C21C7/06B22D11/225C21D8/065Y02P10/20
Inventor 廖家明来永彪左锦中桂仲林王昆鹏赵阳沈艳
Owner ZENITH STEEL GROUP CORP
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