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Heat preservation agent in use for molded casting, and producing technique

An insulating agent and die-casting technology, applied in the field of metal casting, to achieve the effects of reducing the shrinkage cavity of the head, wide and easy access to raw materials, and improving the yield of finished products

Active Publication Date: 2007-07-25
浙江红鹰集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a heat-preserving and heat-retaining agent for steel ingot die-casting, which not only makes the operation of adding heat-generating agent and heat-retaining agent to the riser during the die-casting process easier It is more convenient, and prolongs the high temperature holding time, better improves the shrinkage cavity of the steel ingot head and the anti-segregation effect of carbon elements, and at the same time does not produce gas and dust that pollute the environment during use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1, heat preservation agent component and weight percent thereof are:

[0023] Aluminum powder 15%

[0024] Iron oxide powder 15%

[0025] Steel mill dust collection powder 30%

[0026] High alumina fine powder 22%

[0027] Expandable graphite 18%

[0028] The steel types used for casting are MnCr5 series and 20CrMoTi 2.3t steel ingots. When the molten steel rises to the riser of the steel ingot, heat-insulating agent is put in, and the dosage is 6Kg / steel ingot. 1 piece of sampling sheet near the riser of the inner billet, sampling at the 1 / 4 edge and center of each sample along the diagonal line, drilling samples using a φ6 drill bit, and using infrared analysis to obtain an average deviation of 0.017% for carbon and 0.017% for sulfur. The average deviation is 0.001%, its carbon and sulfur components are stable, and the deviation is within the control range. And in the actual use process, no smoke occurs.

Embodiment 2

[0029] Embodiment 2, heat preservation agent component and weight percentage thereof are

[0030] Aluminum powder 12%

[0031] Iron oxide powder 20%

[0032] Steel mill dust collection 18%

[0033] High alumina fine powder 25%

[0034] Expandable graphite 25%

[0035] For pouring steel grade R49MNVS 3 2.3t steel ingot, the dosage is 6Kg / steel ingot, when the molten steel rises to the riser of the steel ingot, the heating and heat insulating agent is put into it. After four furnaces are used, samples are taken from the head of the steel ingot to analyze the carbon composition. The carbon deviation of the same section is ΔC≤ Within the standard range of 0.05%, the average deviation is 0.0338%, and no smoke occurs during use.

Embodiment 3

[0036] Embodiment 3, heat preservation agent component and weight percentage thereof are

[0037] Aluminum powder 18%

[0038] Iron oxide 24%

[0039] Steel mill dust collection powder 20%

[0040] High alumina fine powder 18%

[0041] Expandable graphite 20%

[0042] For pouring 2.3t steel ingots whose steel type is RNQT90, when the molten steel rises to the riser of the steel ingots, the above-mentioned heating and insulating agent is put in, the dosage is 6Kg / steel ingot, and after 10 furnaces, samples are taken from the head of the steel ingot for carbon composition analysis. The carbon deviation ΔC of the section is within the standard range of ≤0.05%, and the average deviation ΔC 均 It is 0.027%, and no smoke occurs during use.

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Abstract

A heating-insulating agent for the mould casting to prevent the shrinkage cavities on the end of steel ingot and carbon segregation is prepared from heat-generating metal material (12-18 Wt%), oxidant (15-55), slag-forming agent (15-35) and bulking agent (15-25) through proportional mixing.

Description

technical field [0001] The invention belongs to the technical field of metal casting, and in particular relates to a heating and insulating agent added to reduce the shrinkage cavity at the head of a steel ingot and improve the segregation of carbon elements in the steel ingot during the mold casting process of structural steel. Background technique [0002] At present, the heating agent and heat preservation agent used in the riser in die casting are separated. When using it, first add a heat generation agent to the surface of the molten metal in the riser, and then cover a layer of refractory material on the heat generation agent as a heat preservation agent. It is troublesome to operate and use; and the amount of use is limited by the volume space, the time to maintain high temperature is short, and the anti-shrinkage cavity and anti-component segregation effect is not good; in addition, the existing heating agents are generally composed of heating metals such as ferrosili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D27/18
Inventor 虞炳泉
Owner 浙江红鹰集团股份有限公司
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