Method for producing tire cord steel wire by converter billet continuous casting process

A billet continuous casting and cord steel technology, applied in the field of iron and steel metallurgy, can solve the problems of production and development of difficult cord steel products, reduce production efficiency, and high overall cost, so as to reduce production cycle, improve production efficiency, and reduce production cost effect

Active Publication Date: 2012-07-04
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although the above methods are beneficial to improve the quality of cord steel, but the secondary heating process of billet opening, casting billet grinding and vacuum treatment process, not only the overall cost is high, but also the production cycle is relatively long, which reduces the production efficiency
In addition, for small and medium iron and steel enterprises that do not have the above equipment conditions, it is difficult to carry out the production and development of cord steel products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Hot metal pretreatment desulfurization:

[0026] The consumption of desulfurized magnesium powder is 1.9kg / ton of iron, and the mass fraction of sulfur in molten iron after desulfurization is 0.003%.

[0027] 2. Steelmaking process and related parameters:

[0028] The mass fraction of sulfur in molten iron into the furnace is 0.003%, the charging amount is 85.2 tons, the end point carbon mass fraction is 0.19%, the end point temperature T: 1600°C, 2.2kg / ton steel of ferrosilicon alloy and 5.0kg / ton of manganese ferroalloy are added when tapping. Steel: After tapping, add low-alkalinity pre-melted slag 1.20kg / ton steel, micro-nitrogen recarburizer 5.0kg / ton steel, use slag blocking to tap steel, and slag amount 10kg / ton steel.

[0029] The basicity R of the top slag during LF refining is 0.95. Refining two-stage bottom blowing argon flow rate is 400Nl / min and 60Nl / min respectively, sedation time is 10min, LF refining cycle is 55min.

[0030] Continuous casting of 1...

Embodiment 2

[0039] 1. Hot metal pretreatment desulfurization:

[0040] The consumption of desulfurized magnesium powder is 1.7kg / ton of iron, and the mass fraction of sulfur in molten iron after desulfurization is 0.005%.

[0041] 2. Steelmaking process and related parameters:

[0042] The mass fraction of sulfur in molten iron into the furnace is 0.005%, the charging amount is 217.5 tons, the carbon mass fraction at the end point is 0.16%, the end point temperature T is 1585°C, 2.0kg / ton of ferrosilicon alloy and 5.1kg / ton of manganese ferroalloy are added for tapping; After tapping, add 1.35kg / ton of low-alkalinity pre-melted slag, 5.8kg / ton of micro-nitrogen recarburizer, and use slag blocking to tap the steel, and the amount of slag dropped is 12kg / ton of steel.

[0043] The basicity R of the top slag during LF refining is 1.04. The refining two-stage bottom blowing flow rate is 450Nl / min and 50Nl / min respectively, the calming time is 13min, and the LF refining cycle is 58min.

[0...

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Abstract

The invention relates to a method for producing a tire cord steel wire according to a converter billet continuous casting process and belongs to the technical field of production of tire cord steel wires in the field of ferrous metallurgy. The method comprises the following process steps: desulfurizing by pre-treating molten iron, namely desulfurizing by spraying magnesium on a foundry ladle; smelting by using a converter, namely deoxidizing and alloying, modifying steel ladle slag, re-carburizing the molten iron and adding low-alkalinity pre-melted slag into the steel ladle after tapping; adding ferro-silicon alloy, manganese iron alloy and micronitrogen carburant in the tapping process and re-carburizing; and in the refining process and after the refining is finished, rolling the wire at high speed by adopting a two-stage steel ladle bottom blowing argon system and adopting billet continuous casting of 130mm*130mm or 160mm*160mm. The method has the advantages that: the production isreduced; the production efficiency is improved; and the method is particularly suitable for development and production of tire cord steel products in steel enterprises without big billet or rectangular billet continuous casting and without vacuum treatment equipment.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a method for producing cord steel wire rods through a converter billet continuous casting process. Background technique [0002] Cord steel wire rod is known as "the best wire rod", and it is mainly used in the production of car and aircraft tire radials. The processing process of cord steel wire rod is extremely complicated, and the requirements for the broken wire rate in the whole processing process are very strict, so the uniformity of raw material wire structure and composition, cleanliness of steel, drawing performance and surface quality are all extremely strict. requirements, production is difficult. [0003] At present, foreign cord steel manufacturers include Japan Kobe, Nippon Steel, South Korea Pohang Steel, Germany Saest, etc.; domestic manufacturers include Wuhan Iron and Steel, Baosteel, Angang, Qinggang and Shagang. According to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/30C21C7/10C21C7/072B21B1/46
Inventor 王勇王立峰周玉丽张玮王丽萍王猛李舒笳程四华吕迺冰
Owner SHOUGANG CORPORATION
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