As-cast gray cast iron braking material with low alloy content and high thermal fatigue strength

A technology of fatigue strength and braking material, applied in the field of casting, can solve the problems of accelerating the early failure of the brake drum

Inactive Publication Date: 2011-09-21
湖北三环铸造股份有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Frequent braking or long-term braking, the temperature of the brake drum can reach more than 600 ° C, and in actual us...

Method used

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Embodiment Construction

[0011] The present invention will be further described below in conjunction with embodiment.

[0012] Pig iron Q10 or Q12, scrap steel, recycled material, 60 # Ferromanganese and other ingredients are put into the cupola for smelting, the smelted molten iron is inoculated and alloyed, and poured into the pre-made sand mold. After molding and cooling, the rear axle brake drum of the required material is obtained. The test results of the mechanical properties of the casting material are as follows: the weight percentage of its chemical composition is: C: 3.5%, Si: 1.8%, Mn: 0.8%, Cu: 0.2%, Cr: 0.25%, Sb: 0.02%, Sn: 0.018%, P: 0.05%, S: 0.05%, and the balance is Fe. ;Tensile strength σ b =295MPa, the casting matrix is ​​pearlite 85%, phosphorus eutectic and cementite 1%, the rest is ferrite; graphite form: A-type. The test comparison shows that the thermal fatigue life of the brake drum of the as-cast low alloy high thermal fatigue strength gray cast iron brake material is do...

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Abstract

The invention relates to the field of casting and discloses an as-cast gray cast iron braking material with low alloy content and high thermal fatigue strength. The as-cast gray cast iron braking material with low alloy content and high thermal fatigue strength comprises the following chemical components in percentage by weight: 3.5-3.7% of C, 1.6-2.0% of Si, 0.7-1.0% of Mn, 0.15-0.3% of Cu, 0.2-0.3% of Cr, 0.015-0.02% of Sb, 0.018-0.02% of Sn, not more than 0.08% of P, not more than 0.07% of S and the balance of Fe. A production method comprises the steps of: putting cast iron Q10 or Q12, waste steel, foundry returns and ferromanganese iron No. 60 in proportion as required into a cupola furnace for smelting, adding Cr and Sb alloy in certain proportion in a tapping water tank, adding silicon iron No. 75 and Sn and Cu alloy into a foundry ladle, performing primary inoculation and alloying on smelted molten iron, adding a composite inoculant into a casting ladle, performing secondary ladle-to-ladle inoculation, and pouring into a prefabricated sand mould for molding and cooling to obtain a product as required. Due to adoption of the technical scheme, materials are improved, the performance of a brake drum is enhanced and the production cost is reduced.

Description

technical field [0001] The invention relates to the field of casting, and relates to a gray cast iron braking material with low alloy and high thermal fatigue strength in as-cast state. technical background [0002] In production practice, common automobile brake drum materials are HT200, HT250, HT300 or modified gray cast iron materials with Cu and Cr alloys added to them. However, in the actual use process, due to the common phenomenon of automobile overloading in our country, and the uneven roads in the mining area, the mountains are high and the roads are steep, the damage to the brake drum is particularly large. Frequent braking or long-term braking, the temperature of the brake drum can reach more than 600 ° C, and in actual use, the method of spraying water to the brake drum is used to cool down, which accelerates the early failure of the brake drum. According to statistics, the early failure rate of heavy-duty vehicle brake drums reaches 15-20%. Due to the limitati...

Claims

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Application Information

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IPC IPC(8): C22C37/10
Inventor 章永亭谢来旺王修强
Owner 湖北三环铸造股份有限公司
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