Vanadium-titanium vermicular graphite cast iron

Abstract

The invention discloses a vanadium-titanium vermicular graphite cast iron which comprises the following compositions in percentage by weight: 3.4-3.9 percent of carbon, 2.1-2.8 percent of silicon, 0.5-0.9 percent of manganese, 0.10-0.35 percent of vanadium, 0.10-0.25 percent of titanium, 0.01-0.035 percent of residual manganese, 0.02-0.045 percent of residual rare earth, 0.1 percent of phosphorus or less, 0.07 percent of sulfur or less and the balance of iron, wherein in the vanadium-titanium vermicular graphite cast iron, the pearlite content is more than 50 percent, and the vermicular graphite rate is more than 60 percent. The vanadium-titanium vermicular graphite cast iron is used for a vehicle brake drum, is obtained with a vanadium-titanium pig iron as raw materials under the condition without singly adding other alloy elements and has the advantages of good mechanical property, high-temperature thermal fatigue resistance, hot cracking resistance, wear resistance, thermal conductivity, smaller wall thickness sensitivity and smaller vermicular fading property.

Description

technical field [0001] The invention belongs to the field of material metallurgy and relates to vermicular graphite cast iron used for automobile brake drums. Background technique [0002] At present, the materials of automobile brake drums produced at home and abroad mainly include ordinary gray cast iron and alloy gray casts. Gray cast iron has a certain hardness, but the physical and mechanical properties, mechanical strength, low temperature resistance and thermal fatigue resistance of gray cast iron brake drums are not satisfactory in the practical process of automobiles, and thermal cracks and wear are prone to occur during use Fast phenomenon, causing certain security risks. Because high-strength alloy gray cast iron can be obtained by adding alloy elements, at present, low-alloy gray cast iron is mainly used to produce brake drums in various countries. For example, countries such as the United Kingdom and the United States mainly use high-C, low-alloy V and Mo gray...

AI Technical Summary

Problems solved by technology

For example, countries such as the United Kingdom and the United States mainly use high-C, low-alloy V and Mo gray cast iron, and Russia and other countries mainly use Cr, Ni, and Mo alloy gray cast iron. Due to the addition of Ni, Mo and other noble alloy elements, the production cost of the above-mentioned alloy gray cast iron is relatively low. high

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