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A cord steel refining material and its preparation method

A cord steel and equipment technology, which is applied in the field of steelmaking and refining, can solve the problems of increasing the probability of white spot defects in steel, unfavorable cost control, and large energy consumption, so as to improve the unstable composition, hard texture, and energy saving. Effect

Active Publication Date: 2016-01-20
大连环球矿产股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent ZL99127560.8 discloses an artificial wollastonite, which can be used as a purifying agent for molten steel, but its processing method is high-temperature melting synthesis, which consumes a lot of energy and is expensive, which is not conducive to cost control
Inventor Mori Yoshihiro and others disclosed a material for reductive steel refining and its granulation method in Chinese patent CN1654687A. The process of using resin components as binders will have many effects: binder pyrolysis, It will increase the hydrogen of molten steel, increase the probability of steel white spot defects, and produce air pollution at the same time

Method used

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  • A cord steel refining material and its preparation method
  • A cord steel refining material and its preparation method
  • A cord steel refining material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh CaSiO 3 Content is 90%, 60 mesh wollastonite 2000kg, CaO content is 89%, 100 mesh active lime 200kg, NaCO 3 20kg of industrial soda ash with a content of 90%.

[0025] ②Mix in closed pre-mixing equipment;

[0026] ②Mechanically formed under the pressure of 35MPa, it is a sphere of ∮25~∮40mm.

[0027] The detected component content is SiO 2 : 42.3%, CaO: 47.6%, MgO: 1.18%, Na 2 O: 0.48%, trace amount of impurities.

Embodiment 2

[0029] The cleaning agent obtained in Example 1 was tested in the following process: converter tapping-RH-LF-soft argon blowing and stirring-continuous casting-prime rolling-rolling wire rod process. During the tapping process, it is added to molten steel for slag washing, and the addition amount is 6-8kg / t. After tapping, the molten steel is sent to RH for vacuum treatment. After the RH treatment, the molten steel reaches LF refining. Before refining, 6-8kg / t of purifying agent is added. After LF refining is completed for 45 minutes, it enters other processes. The condition of non-metallic inclusions in the steel sample was tested by SEM, which showed that: with this refined material, the number of inclusions decreased and the size became smaller. 1-2um inclusions accounted for 80% of the total, and inclusions larger than 5um were rarely, to 5% of the total. The inclusion composition consists of brittle and hard Al 2 o 3 into CaO-SiO 2 -Al 2 o 3 system, the melting poin...

Embodiment 3

[0031] ① Weighing CaSiO 3 The content is 68%, 60 mesh wollastonite 1500kg, CaO content is 88%, 100 mesh active lime 12g, CaF 2 The content is 85%, 40 mesh fluorite 180kg, mixed in closed pre-mixing equipment;

[0032] ②Mechanically formed under the pressure of 35MPa, it is a sphere of ∮15~∮40.

[0033] The detected component content is SiO 2 : 39.5%, CaO: 47.6%, CaF 2 : 9.2%, MgO: 2.58%, Na 2 O: 0.26%, trace amount of impurities.

[0034] The purifying agent was added to molten steel in 23 furnaces for testing, and the inclusions detected by the metallographic microscope of the steel sample were significantly reduced.

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Abstract

The invention relates to a novel tire cord steel refined material formula and a preparation method thereof. The formula is composed of following components in percentage by weight: 23.8 to 80% of SiO2, 18.5 to 75% of CaO, 0.0 to 9.5% of CaF2, 1.0 to 10.0% of MgO, 0.2 to 6.0% of Na2O, 0.0 to 5.0% of B2O3, 0.0 to 0.10% of S, and 0.0 to 0.08% of P. The refined material prepared according to the formula has the advantages of stable and homogenous components, hard texture, no fragmentation, no powder, no dust when being thrown into steel water, and environment-friendliness. Because the refined material is produced by direct high-pressure forming or pelletizing plate forming, the energy consumption is saved, the cost is reduced, and the economic benefit is improved. The preparation method overcomes the shortages of unstable components and large fluctuation range of melting point of natural wollastonite, compared to the conventional methods which directly use the natural wollastonite.

Description

technical field [0001] The invention relates to a cord steel refining material and a preparation method thereof, belonging to the technical field of steelmaking and refining. Background technique [0002] Cord steel is a high-tech product, mainly used in tire meridians, high-strength pull wires, etc. During the processing of the steel cord, its monofilament diameter is as small as 0.15mm, and the wire is drawn from the Φ5.5mm wire, and the length must be extended by 1344 times, and it must also undergo torsion, bending and stretching during the subsequent twisting process A series of deformations such as; in the working state, the steel cord has to bear the periodic push-pull stress and the sudden stress of emergency braking to meet the requirements of high strength, fatigue resistance and impact resistance. This requires that the inclusions in the steel are small in size, small in number, and have good ductility and plasticity. [0003] According to the development needs ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/04C21C7/076
CPCY02P10/20
Inventor 张延大张梦显
Owner 大连环球矿产股份有限公司
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