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Cast iron for brake disc, and heat treatment method for brake disc made of cast iron

A heat treatment method and brake disc technology, applied in the field of cast iron for brake discs, can solve the problems of easy corrosion, no obvious advantages, low tensile strength of high-carbon gray cast iron, etc.

Active Publication Date: 2015-07-22
SHANDONG ZHENGNUO GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High carbon gray cast iron has the characteristics of low tensile strength
Ductile iron has high tensile strength, but its wear resistance is not high under high temperature dry friction conditions, especially in the case of rapid cooling and rapid heating, its heat resistance has no obvious advantage compared with gray cast iron materials, and in Easy to rust in the air

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1, a kind of cast iron that is used for brake disk is by weight percentage be 2.8% carbon, 1.6% silicon, 0.4% manganese, 0.8% copper, 0.5% chromium, 0.3% molybdenum, 0.07% boron , 0.1% phosphorus, ≤0.12% sulfur, and the balance iron content is generally 93.62%. The brake disc made of cast iron with this component, after finishing, has a body hardness of HB=220~ before nitriding heat treatment. 280. The steps of the nitriding heat treatment process include: cleaning the surface of the brake disc, placing the brake disc in a nitriding furnace to remove air, filling the nitriding furnace with a nitrogen supply medium to carry out nitriding treatment on the brake disc, removing The nitrogen medium is supplied in the nitriding furnace, and the brake disc is released after cooling naturally with the nitriding furnace. According to different nitriding furnaces, the nitrogen supply medium can be urea, ammonia, formamide or triethanolamine. The surface hardness of th...

Embodiment 2

[0015] Embodiment 2, a kind of cast iron that is used for brake disc is by weight percentage be 3.2% carbon, 2.0% silicon, 0.7% manganese, 1.2% copper, 1.4% chromium, 0.5% molybdenum, 0.1% boron , 0.25% phosphorus, ≤0.12% sulfur, and the balance iron content is generally 90.75%. The brake disc made of this component cast iron, after finishing, has a body hardness of HB=250-280 before nitriding heat treatment. The steps of the nitriding heat treatment process include: cleaning the surface of the brake disc, placing the brake disc on Remove the air in the nitriding furnace, fill the nitriding furnace with a nitrogen supply medium to nitride the brake disc, remove the nitrogen supply medium in the nitriding furnace, and then release the brake disc after cooling naturally with the nitriding furnace. According to different nitriding furnaces, the nitrogen supply medium can be urea, ammonia, formamide or triethanolamine. The surface hardness of the brake disc after nitriding is HRC...

Embodiment 3

[0016] Embodiment 3, a kind of cast iron that is used for brake disk is by weight percentage be 3% carbon, 1.8% silicon, 0.5% manganese, 1% copper, 1.2% chromium, 0.4% molybdenum, 0.08% boron , 0.2% phosphorus, ≤0.12% sulfur, and the balance iron content is generally 91.92%. The brake disc made of this component cast iron, after finishing, has a body hardness of HB=240-270 before nitriding heat treatment. The steps of the nitriding heat treatment process include: cleaning the surface of the brake disc, placing the brake disc on Remove the air in the nitriding furnace, fill the nitriding furnace with a nitrogen supply medium to nitride the brake disc, remove the nitrogen supply medium in the nitriding furnace, and then release the brake disc after cooling naturally with the nitriding furnace. According to different nitriding furnaces, the nitrogen supply medium can be urea, ammonia, formamide or triethanolamine. The surface hardness of the brake disc after nitriding is HRC=58~...

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Abstract

The invention discloses cast iron for a brake disc, and a heat treatment method for the brake disc made of the cast iron. The cast iron is composed of the following materials by weight: 2.8 to 3.2 percent of carbon, 1.6 to 2.0 percent of silicone, 0.4 to 0.7 percent of manganese, 0.8 to 1.2 percent of copper, 0.25 to 1.4 percent of chromium, 0.3 to 0.5 percent of molybdenum, 0.03 to 0.05 percent of boron, 0.15 to 0.25 percent of phosphorus, 0 to 0.12 percent of sulfur, and ferrum in balancing amount. The brake disc made of the cast iron is anti-fatigue, abrasion-resistant and corrosion-resistant in a high-temperature dry friction condition after being treated with malcomising, thereby being long in service life.

Description

technical field [0001] The invention belongs to the technical field of cast iron used for brake discs, in particular to a heat treatment method for cast iron used for brake discs and the produced brake discs. Background technique [0002] Automobile brake discs are the main components of automobile disc brakes. At present, the known automobile brake discs are made of high-carbon gray cast iron or ductile iron with low alloying elements such as copper, chromium, molybdenum, etc., such as Chinese patent application specification 200910229533.6 ( The application date is 2009.10.28) discloses a kind of ductile iron for heavy truck brake disc, which is composed of 0.5%-0.6% molybdenum, 0.008%-0.02% antimony, 3.6%-3.8% carbon, 2.0 %-2.5% silicon, 0-0.4% manganese, 0-0.02% sulfur, 0-0.04% phosphorus, 0.03%-0.06% magnesium, 0.02%-0.05% rare earth, and the balance is iron. High carbon gray cast iron is characterized by low tensile strength. Ductile iron has high tensile strength, b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C23C8/26
Inventor 商好峰李广全宋立伟
Owner SHANDONG ZHENGNUO GRP