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A special low-silicon and ultra-low-carbon covering agent for automobile sheet steel and its preparation method

A covering agent and automobile plate technology, applied in the metallurgical field, can solve the problems of inability to absorb impurities, large dust and smoke, and adverse effects on the environment and operators, and achieve the effects of easy carbon increase, good quality, and improved labor productivity.

Active Publication Date: 2020-01-31
西峡县西保冶金材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been verified that although the covering agent prepared by the invention has a certain heat preservation effect, it cannot absorb impurities in molten steel, and the invention uses atomized spray wet granulation, which contains relatively large dust and smoke, which is unfavorable to the environment and operators Greater impact

Method used

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  • A special low-silicon and ultra-low-carbon covering agent for automobile sheet steel and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0032] A special low-silicon ultra-low-carbon covering agent for automobile sheet steel, comprising the following components in mass percentage: SiO2 ≤3.0%, CaO 40.0~50.0%, C ≤1.0%, Al 2 o 3 20.0-30.0%, MgO 6.0~14.0%, Fe 2 o 3 ≤3.0%, S≤0.04%, and the rest are unavoidable impurities. The composition of embodiment 1-6 covering agent is shown in table 1.

[0033] The covering agent is prepared from sintered material, calcium carbonate powder, magnesia, and binder according to the ingredients in Examples 1-6, wherein the binder is carboxymethyl cellulose.

[0034] The sintered material comprises the following components in mass percentage: SiO 2 ≤2.5%, CaO 45.0~55.0%, Al 2 o 3 30.0~40.0%, S≤0.05%, C≤0.3, and the rest are unavoidable impurities. The composition of the sintered material of Examples 1-6 is shown in Table 2.

[0035] Table 1 The mass percent of each component of embodiment 1-6 covering agent

[0036] SiO2, % CaO, % C，% Al2O3,% MgO,% Fe2O3,...

Embodiment 7

[0052] A special low-silicon and ultra-low-carbon covering agent for automobile sheet steel, the components and raw materials contained in the mass fraction are the same as those in Example 5.

[0053] The preparation method of a special low-silicon ultra-low-carbon covering agent for automobile sheet steel described in this embodiment comprises the following steps:

[0054] S1: Weigh the sintered material, calcium carbonate powder and magnesia and put them in a mixer for mixing. Binder, adjusting rotating speed is 700r / min, and the time is 8min, obtains mixed material 1;

[0055] S2: Elevate the mixed material 1 obtained in step S1 to the silo, add water to stir and humidify, the weight of the water is 12% of the weight of the mixed material 1, adjust the rotating speed to 700r / min, and the time is 8min, to obtain the mixed material 2;

[0056] S3: Put the mixed material 2 obtained in step S2 on an extruder to extrude and granulate at an extrusion temperature of 85°C and an ...

Embodiment 8

[0060] A special low-silicon and ultra-low-carbon covering agent for automobile sheet steel. The components and raw materials contained in the mass fraction are the same as those in Example 7, but the difference from Example 7 is that 0.5% silane coupling agent is added in this example.

[0061] The preparation method of the special low-silicon and ultra-low-carbon covering agent for automobile sheet steel is the same as in Example 7, wherein, in step S1, the adhesive and the silane coupling agent are added at the same time.

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Abstract

The invention discloses a special low-silicon ultra-low carbon covering agent for car plate steel and a preparation method thereof, and belongs to the technical field of metallurgy. The special low-silicon ultra-low carbon covering agent is prepared from the following components according to mass percent: less than or equal to 3.0% of SiO2, 40.0 to 50.0% of Ca, less than or equal to 1.0% of C, 20.0 to 30.0% of Al2O3, 6.0 to 14.0% of MgO, less than or equal to 3.0% of Fe2O3, less than or equal to 0.04% of S and the balance of inevitable impurities. The special low-silicon ultra-low carbon covering agent has excellent insulation performance, and the defect of easiness in recarburization of the car plate steel is effectively overcome; new materials are added, and the proportion of a formula is optimized, so that the absorption of inclusions in molten steel is effectively increased, the impurity content of billet steel is further reduced, the cleanliness of the molten steel is increased, an innovation demonstration effect is achieved technically, additionally, the product qualification rate of a steel mill is effectively increased, the labor productivity is increased, the working procedure is simplified, and the energy-saving and cost-reducing effects are obvious.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a special low-silicon and ultra-low-carbon covering agent for automobile sheet steel and a preparation method thereof. Background technique [0002] The rapid development of the automobile industry has driven the production of automobile sheet steel, and now advanced steel companies attach great importance to the production of automobile sheet steel. Automobile sheet steel has excellent deep drawing and no timeliness, has gradually become a new generation of stamping steel, and is a symbol of a country's production level of automobile steel sheets. Automobile sheet steel has relatively strict requirements on the purity of molten steel, and the selection of the production process directly affects the quality of automobile sheet steel and the smooth flow of production. The characteristics of the composition of automobile sheet steel are: in order to obtain good deep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 张振李伟锋李书成
Owner 西峡县西保冶金材料有限公司
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