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A kind of vanadium-titanium gray cast iron brake drum and preparation method thereof

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

Inactive Publication Date: 2016-11-30
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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  • A kind of vanadium-titanium gray cast iron brake drum and preparation method thereof
  • A kind of vanadium-titanium gray cast iron brake drum and preparation method thereof
  • A kind of vanadium-titanium gray cast iron brake drum and preparation method thereof

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Experimental program
Comparison scheme
Effect test

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...

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Abstract

The invention relates to a high-strength and high-wear-resistance vanadium-titanium cast iron brake drum manufacturing technology for automobiles, specifically a method for preparing a vanadium-titanium gray cast iron brake drum. The preparation method includes the following steps: melting the original molten iron: Vanadium-titanium pig iron, scrap steel, furnace charge, recarburizer, ferrosilicon, ferromanganese, and ferrochrome are used as the charge, and the recarburizer is added to the bottom of the furnace, and the charge is smelted in an intermediate frequency induction furnace to obtain the original molten iron. After the molten iron is melted Raise the temperature and overheat to purify the molten iron, then keep it warm at 1520-1530°C; then carry out slag removal, add a slag accumulator on the surface to keep it warm, and then add a small amount of recycled material to adjust the composition of the molten iron. The invention adopts the process of adding a small amount of returned material to increase the heterogeneous core in the later stage of smelting to reduce the tendency of molten iron to be white, improve the graphitization ability of molten iron, and improve the inoculation effect; adopt the secondary inoculation treatment process of the tapping trough and the sprue cup to improve the inoculation effect , Improve graphite morphology, eliminate carbide and ferrite, increase pearlite content.

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 Patents(China)
IPC IPC(8): C22C37/10C22C33/08B22D3/00
Inventor 陈国武广波陈艳
Owner 陈国
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