Vanadium-titanium vermicular cast iron and production method thereof

Abstract

The invention discloses vanadium-titanium vermicular cast iron and a production method thereof. The vanadium-titanium vermicular cast iron comprises the following compositios in percent by weight: 3.8-4.2% of carbon, 1.8-2.2% of silicon, 0.4-0.7% of manganese, 0.15-0.34% of vanadium, 0.05-0.08% of titanium, 0.1-0.3% of chromium, 0.03-0.06% of sulfur, 0.05-0.09% of phosphorus, 0.01-0.03% of residual magnesium, and the balance iron. The vanadium-titanium vermicular cast iron employs vanadium-containing pig iron as a raw material, and is not added with other precious metal elements. The produced vanadium-titanium vermicular cast iron possesses the characteristics of excellent mechanical properties, good wear resistant, thermal fatigue resistance, low production cost and the like. The pearlite content in the vanadium-titanium vermicular cast iron microstructure is 70% or more, the vermicular graphite rate is 70% or more, and on the aspect of mechanical properties, the tensile strength is 400 MPa-460 MPa, and the Brinell hardness is 200 HBS-240 HBS. The vanadium-titanium vermicular cast iron utilizes vanadium-containing pig iron as the raw material and is not added with other precious metal elements, therefore the production cost is reduced and the performances reach RuT450A requirements. The vanadium-titanium vermicular cast iron possesses good mechanical properties, wear resistance and thermal conductivity, is applicable to produce automobile brake drums, brake discs and other parts, and has wide market application prospect.

Description

technical field [0001] The invention belongs to the technical field of automobile manufacturing, and in particular relates to a vanadium-titanium vermicular graphite cast iron and a production method thereof. Background technique [0002] Brake drums and brake discs are the most common brake parts on cars, and they are also important guarantees for car driving safety. With the rapid development of the automobile industry, higher requirements are put forward for brake drum and brake disc materials, and the brake materials are developing in the direction of high strength, high wear resistance, and high thermal fatigue resistance. At present, the materials used for brake drums and brake discs in China are mainly HT250, HT300, low-alloy gray cast iron and vanadium-titanium gray cast iron, but they generally have the characteristics of low strength and poor thermal fatigue resistance, and often appear hot during use. Cr, Ni and Mo are often added in the production of low-alloy g...

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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a vanadium-titanium vermicular graphite cast iron and its production method, aiming to solve the problems of high production cost, poor thermal conductivity and shock absorption of existing brake drum and brake disc materials. bad question

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