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Gray cast iron material for commercial vehicle brake drum and preparation method of gray cast iron material

A technology of gray cast iron and brake drum, which is applied in the field of gray cast iron materials for commercial vehicle brake drums and its preparation, can solve the problems of poor thermal fatigue performance, short service life of brake drums, poor thermal conductivity, etc., and achieve improved thermal performance. Effect of Fatigue Properties and Service Life

Inactive Publication Date: 2021-06-18
SINO TRUK JINAN POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of short service life, poor thermal conductivity, and poor thermal fatigue performance of automobile brake drums in the prior art, the present invention provides a gray cast iron material for commercial vehicle brake drums and a preparation method thereof. Using a certain chemical composition, adopting a certain chemical composition, adopting measures such as molten iron pretreatment and secondary inoculation, can effectively improve the thermal fatigue performance and service life of the brake drum

Method used

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  • Gray cast iron material for commercial vehicle brake drum and preparation method of gray cast iron material
  • Gray cast iron material for commercial vehicle brake drum and preparation method of gray cast iron material
  • Gray cast iron material for commercial vehicle brake drum and preparation method of gray cast iron material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The percentage by weight of each component of the commercial vehicle brake drum gray cast iron material described in Example 1 is as follows: C 3.75%, Si 1.7%, Mn 0.55%, S 0.07%, P 0.02%, Cu 0.5%, Cr 0.15%, V 0.08%, Sn 0.06%, Zr 0.02%, La0.008%, the balance is Fe and unavoidable impurities;

[0033] The preparation method of the commercial vehicle brake drum gray cast iron material is as follows:

[0034] (1) Put the raw materials into the electric furnace for smelting according to the above formula to obtain liquid raw materials;

[0035] (2) Raise the temperature of the liquid raw material in step (1) to 1510°C, remove the slag, add SiC pretreatment agent with a weight of 0.1% of the liquid raw material, and after 10 minutes, the temperature of the liquid raw material is reduced to 1490°C to obtain raw molten iron;

[0036] (3) Pour the original molten iron into the ladle, add SiMnZr inoculant of 0.2% by weight of molten iron in the ladle, add SiMnZr inoculant of 0.2...

Embodiment 2

[0039] The percentages by weight of the components of the commercial vehicle brake drum gray cast iron material in Example 2 are as follows: C3.85%, Si1.9%, Mn0.65%, S0.09%, P0.05%, Cu0.6% , Cr0.25%, V0.09%, Sn0.09%, Zr0.03%, La0.009%, the balance is Fe and unavoidable impurities;

[0040] The preparation method of the commercial vehicle brake drum gray cast iron material is as follows:

[0041] (1) Put the raw materials into the electric furnace for smelting according to the above formula to obtain liquid raw materials;

[0042] (2) Raise the temperature of the liquid raw material in step (1) to 1520°C, remove the slag, add SiC pretreatment agent with a weight of 0.1% of the liquid raw material, and after 13 minutes, the temperature of the liquid raw material is reduced to 1496°C to obtain raw molten iron;

[0043] (3) Pour the original molten iron into the ladle, add SiMnZr inoculant of 0.22% of the weight of molten iron in the ladle, add SiMnZr inoculant of 0.25% of the we...

Embodiment 4

[0046] The percentage by weight of each component of the commercial vehicle brake drum gray cast iron material described in Example 4 is as follows: C 3.8%, Si 1.8%, Mn 0.61%, S 0.08%, P 0.03%, Cu 0.55%, Cr 0.19%, V 0.085%, Sn 0.08%, Zr 0.025%, La 0.008%, the balance is Fe and unavoidable impurities;

[0047] The preparation method of the commercial vehicle brake drum gray cast iron material is as follows:

[0048] (1) Put the raw materials into the electric furnace for smelting according to the above formula to obtain liquid raw materials;

[0049] (2) Raise the temperature of the liquid raw material in step (1) to 1515°C, remove the slag, add SiC pretreatment agent with a weight of 0.1% of the liquid raw material, and after 13 minutes, the temperature of the liquid raw material is reduced to 1490°C to obtain raw molten iron;

[0050] (3) Pour the original molten iron into the ladle, add 0.20% SiMnZr inoculant by weight of molten iron in the ladle, and add SiMnZr inoculant b...

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Abstract

The invention discloses a gray cast iron material for a commercial vehicle brake drum and a preparation method of the gray cast iron material. The gray cast iron material comprises 3.7%-3.9% of C, 1.6%-2.0% of Si, 0.5%-0.7% of Mn, 0.05%-0.1% of S, 0.5%-0.7% of Cu, 0.1%-0.3% of Cr, 0.07%-0.1% of V, 0.05%-0.1% of Sn, 0.01%-0.04% of Zr, 0.007%-0.01% of La and the balance Fe and inevitable impurities. The preparation method comprises the following steps that raw materials are smelted to obtain a liquid raw material, the temperature is increased to 1500 DEG C-1530 DEG C, a pretreating agent is added, cooling is conducted to 1480 DEG C-1500 DEG C to obtain base molten iron, the base molten iron is poured into a casting ladle, an inoculant is added when the molten iron is discharged to obtain molten iron, the molten iron is poured at 1370 DEG C-1430 DEG C, and stream inoculation is carried out simultaneously to obtain the gray cast iron material for the commercial vehicle brake drum. According to the gray cast iron material for the commercial vehicle brake drum and the preparation method of the gray cast iron material, the measures of molten iron pretreatment, secondary inoculation and the like are adopted, the graphite form is A type graphite with the moderate size and a small amount of C type graphite, a matrix structure with the fine sheet pearlite larger than or equal to 95% is obtained, the tensile strength of a brake drum body is 210 Mpa-260 Mpa, the working face hardness value is 180 HBW-220 HBW, the thermal fatigue performance of the brake drum can be effectively improved, and the service life of the brake drum can be effectively prolonged.

Description

technical field [0001] The invention belongs to the technical field of gray cast iron materials, and in particular relates to a gray cast iron material for commercial vehicle brake drums and a preparation method thereof. Background technique [0002] Automobile brake drum is an important part of automobile driving system, which plays a role in guaranteeing the safety performance of the whole vehicle. At present, domestic commercial vehicle brake drum manufacturers, due to the impact of competition and profits, result in low quality brake drum products and less investment in in-depth research on brake drums, resulting in generally low service life of domestic brake drums, especially In mountainous areas where frequent braking is required, the service life of the brake drum is generally low; frequent replacement of the brake drum not only wastes a lot of financial and material resources, but also the failure of the brake drum during the driving process of the car may cause a v...

Claims

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Application Information

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IPC IPC(8): C22C37/06C22C37/10C22C33/08C21C1/08B22D1/00
CPCC22C37/06C22C37/10C22C33/08C21C1/08B22D1/00
Inventor 刘长森王正军刘安辉慕倩楠何科
Owner SINO TRUK JINAN POWER
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