Vanadium titanium cast iron brake drum and preparation method thereof

A brake drum and gray cast iron technology, applied in the field of casting metal materials, can solve the problems of failure to produce in large quantities, differences in composition range, and no mass production, etc., and achieve the effects of improving the inoculation effect, increasing the strength, and improving the inoculation effect

Inactive Publication Date: 2014-08-20
陈国
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] There have been precedents for the research and production of vanadium-titanium cast iron brake drums in China. Panzhihua Iron and Steel Overhaul Factory once produced vanadium-titanium cast iron brake drums, but its composition contains 0.3% molybdenum, which is costly. The process is complex and cannot be mass-produced
The patent "High-strength Automobile Brake Wheel Casting Formula and Process" (Application No.: 200610051293.1) contains 0.5-0.8% chromium, 0.05-0.09% vanadium, and 0.05-0.09% titanium in the brake wheel composition. Although it belongs to vanadium-titanium cast iron Brake drum, but with chromium as the main alloying element, the composition range is significantly different from that of the present invention, and there is no mass production

Method used

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  • Vanadium titanium cast iron brake drum and preparation method thereof
  • Vanadium titanium cast iron brake drum and preparation method thereof
  • Vanadium titanium cast iron brake drum and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0039] The preparation method of vanadium-titanium gray cast iron brake drum among the present invention, comprises the following steps:

[0040] 1) Melting the original molten iron: taking vanadium-titanium pig iron, scrap steel, returned charge, recarburizer, ferrosilicon, ferromanganese, and ferrochrome as charge, the weight percentage of each chemical component in the charge is: C: 3.2-3.6%, Si : 1.3~1.6%, Mn: 0.6~0.9%, P≤0.10%, S: 0.07~0.12%, V: 0.15~0.20%, Ti: 0.0:7~0.12%, Cr: 0.25~0.35%, balance It is Fe and other unavoidable impurities; smelt with medium frequency induction furnace, heat up and purify molten iron after melting, keep it at 1520-1530°C for 10 minutes; The brake drum is returned to the furnace charge, and the composition of the molten iron is adjusted to meet the requirements; the slag accumulator is expanded perlite, and the composition and percentage content of the expanded perlite are: SiO 2 : 68~74%, Ai 2 o 3 : 10~16%, the balance is Na 2 O, K 2 ...

Embodiment

[0046] According to the preparation method of the vanadium-titanium gray cast iron brake drum in the specific embodiment of the present invention, prepare 4 furnaces the vanadium-titanium gray cast iron brake drum of different compositions combination within the scope of the composition specified in the present invention, check its chemical composition, metallographic structure and mechanical Performance, the results are shown in Table 3 and Table 4.

[0047] Table 3 prepares vanadium-titanium gray cast iron brake drum chemical composition (wt%):

[0048] serial number C Si mn P S V Ti Cr Example 1 3.43 1.71 0.88 0.085 0.081 0.171 0.075 0.26 Example 2 3.36 1.82 0.83 0.092 0.083 0.182 0.091 0.29 Example 3 3.35 1.76 0.85 0.083 0.092 0.195 0.100 0.32 Example 4 3.40 1.77 0.81 0.089 0.088 0.187 0.093 0.30

[0049] Table 4 Metallographic structure and mechanical properties of vanadium-titanium gray cast iro...

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Abstract

The invention relates to a manufacturing technique of an automotive vanadium titanium cast iron brake drum with high strength and high abrasive resistance, and particularly relates to a preparation method of a vanadium titanium cast iron brake drum. The preparation method comprises the following steps: melting base iron, namely b y taking vanadium titanium pig iron, steel scrap, foundry returns, a carburant, ferrosilicon, ferromanganese and ferrochrome as furnace charge, adding the carburant to the furnace bottom; smelting the furnace charges by using a medium-frequency induction furnace to prepare the base iron; heating and purifying molten iron in an overheating manner after the molten iron is molten down, and then carrying out heat preservation at 1520-1530 DEG C; and carrying out drossing, adding a slag conglomeration agent to the surface to carry out heat preservation after drossing, and then adding a little of furnace charge, and adjusting the ingredients and the like of the molten iron. A little of furnace charge is added at the later smelting stage to increase the heterogeneous core technology, so that the chilling tendency of the molten iron is relieved, the graphitization ability of the molten iron is improved, and the inoculation effect is improved. A secondary inoculation treatment process of a launder and a pouring cup is adopted, so that the inoculation effect is improved, the graphite form is improved, carbide and ferrite are removed, and the content of pearlite is improved.

Description

technical field [0001] The invention relates to the field of cast metal materials, and relates to a high-strength and high-wear-resistance vanadium-titanium cast iron brake drum manufacturing technology for automobiles, in particular to a preparation method of a vanadium-titanium gray cast iron brake drum. Background technique [0002] Automobile brake drums are used under thermal fatigue and wear conditions. Therefore, the brake drum material is required to have good thermal fatigue resistance and wear resistance. Automobile brake drums are generally produced with high-strength gray cast iron, and its material development direction is high thermal conductivity and high strength. Generally, the thermal conductivity is improved by increasing the carbon content and graphite morphology, and the strength is improved by adding alloy elements. The material grade of ordinary cast iron brake drum is HT250, with a carbon content of 3.2-3.5%, adding 0.3-0.6% copper and chromium for a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C33/08B22D3/00
Inventor 陈国武广波陈艳
Owner 陈国
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