Compound inoculant used for producing D-type graphite cast iron and preparation method thereof

A composite inoculant and graphite cast iron technology, applied in the field of inoculants, can solve problems such as a lot of research results, achieve the effects of reducing adverse effects, reducing residual stress, and improving cutting performance

Inactive Publication Date: 2009-12-23
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are many research results on which alloy elements have supercooling effect on cast iron, as well as the amount and method of addition, and

Method used

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  • Compound inoculant used for producing D-type graphite cast iron and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: With the prepared raw material, according to the method for layered charging, raw material is packed in the crucible of induction furnace, the sequence of layered furnace charging and the weight percent of raw material are: scrap steel 9.3%, ferrosilicon 11.2% %, pure magnesium ingot 2.5%, pure aluminum ingot 0.8%, pure antimony ingot 1.0%, rare earth ferrosilicon alloy 20%, titanium iron 24%, silicon calcium alloy 10%, silicon barium alloy 10%, ferrosilicon 11.2%. Melt the loaded raw materials, stir them evenly, and cast them out of the oven; after solidification and cooling, break them into 3-8mm particle size to obtain the composite inoculant. The purpose of crushing into the above particle size is to facilitate the absorption of molten iron.

[0023] The alloy content of the composite inoculant that present embodiment obtains is: magnesium (Mg) 2.0%, rare earth (RE) 6.0%, titanium (Ti) 7.0%, aluminum (Al) 2.0%, antimony (Sb) 1.0%, calcium ( Ca) 3.0%, ...

Embodiment 2

[0024] Embodiment 2: The difference between this embodiment and Embodiment 1 is that: when producing this composite inoculant, the amount of raw materials charged is: 3.93% of scrap steel, 15.8% of ferrosilicon, 1.25% of pure magnesium ingot, and 2.32% of pure aluminum ingot , pure antimony ingot 0.5%, rare earth ferrosilicon alloy 26.7%, ferro-titanium 13.5%, calcium-silicon alloy 16.7%, barium-silicon alloy 3.5%, ferrosilicon 15.8%. The alloy content of the obtained composite inoculant is: magnesium (Mg) 1.0%, rare earth (RE) 8.0%, titanium (Ti) 4.0%, aluminum (Al) 3.0%, antimony (Sb) 0.5%, calcium (Ca) 5.0% %, barium (Ba) 1.0%, silicon (Si) 50%, and the balance is iron (Fe).

Embodiment 3

[0025] Embodiment 3: The difference between this embodiment and Embodiment 1 is that: when producing the composite inoculant, the amount of raw materials charged is: 9.3% of scrap steel, 10.0% of ferrosilicon, 5.0% of pure magnesium ingot, and 0.0% of pure aluminum ingot , pure antimony ingot 2.0%, rare earth ferrosilicon alloy 13.5%, ferro-titanium 30.0%, silicon-calcium alloy 6.7%, silicon-barium alloy 13.5%, ferrosilicon 10.0%. The alloy content of the composite inoculant obtained in the present embodiment is: magnesium (Mg) 4.0%, rare earth (RE) 4.0%, titanium (Ti) 9.0%, aluminum (Al) 1.5%, antimony (Sb) 2.0%, calcium ( Ca) 2.0%, barium (Ba) 4.0%, silicon (Si) 35%, and the balance is iron (Fe).

[0026] Example of use: The use of this composite inoculant in the production of Cummins diesel engine cylinders under the conditions of cupola-electric furnace dual smelting:

[0027] Cummins diesel engine cylinder block is made of HT250 cast iron, which requires high compactness, ...

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Abstract

The invention discloses a compound inoculant used for producing D-type graphite cast iron, which is characterized in that the weight percents of the constituents are as follows: magnesium 1.0-4.0, rare earth 4.0-8.0, titanium 4.0-9.0, aluminum 1.5-3.0, stibium 0.5-2.0, calcium 2.0-5.0, barium 1.0-4.0, silicon 35-50 and the balance of iron. When the compound inoculant is employed to carry out inoculation on the melted iron with high carbon equivalent, the obtained graphite in the cast iron is the D-type graphite. The mechanical properties of castings are high, the tensile strength reaches over 250MPa and the compactness is good. The melted iron has high carbon equivalent, thus greatly improving the casting properties of alloys, reducing the residual stress of the castings, contributing to good size stability and enhancing the machinability of the castings. The multiple compound inoculant adopts ladle bottom pouring process, namely, the compound inoculant is placed on the bottom of a ladle, then the melted iron is injected and the compound inoculant is continuously melted and absorbed in the process of melted iron injection, thereby reaching the satisfactory inoculation effect, therefore, the method is simple and the use is convenient.

Description

technical field [0001] The invention relates to an inoculant for cast iron, in particular to a composite inoculant for producing D-type graphite cast iron and a preparation method thereof. Background technique [0002] The carbon in ordinary gray cast iron generally exists in the form of flake graphite. According to its shape, flake graphite is divided into A, B, C, D, E, F and other types. The traditional point of view is that A-type graphite is evenly distributed, non-directional, and has less splitting effect on the matrix, so that cast iron has higher strength; D-type graphite is a point-like distribution between austenite dendrites without direction or small flakes of graphite, is a detrimental tissue that reduces the strength of cast iron. However, a large number of studies in recent years have shown that D-type graphite cast iron has higher strength, denser, better dimensional stability, better thermal fatigue resistance, and higher machining surface quality than A-...

Claims

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Application Information

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IPC IPC(8): C22C33/10B22D1/00
Inventor 张忠诚王忠民刘瑞玲
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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