Vermicular graphite cast iron material and preparation method and application thereof

Abstract

The invention discloses a vermicular graphite cast iron material. The material comprises components in percentage by mass of, 3.0-3.9% of carbon, 2.3-3.0% of silicon, less than or equal to 0.4% of copper, less than or equal to 0.01% of chromium, less than or equal to 0.02% of sulfur, less than or equal to 0.07% of phosphorus, less than or equal to 0.5% of manganese and the balance of iron and inevitable impurities. The vermicular graphite cast iron material is not prone to cracking and good in heat dissipation performance, the tensile strength reaches up to 523 Mpa, and the vermiculation ratereaches up to 95%. The invention further discloses a preparation method of the vermicular graphite cast iron material, a ladle bottom pouring method is adopted, a transfer ladle is placed on one sideof a dam, the transfer ladle contains vermiculizer, inoculant and the like, so the prepared vermicular graphite cast iron material is excellent in performance and high in vermicular graphite rate. Thematerial is advantaged in that the vermicular graphite cast iron is applied to production of brake drums, brake discs, speed reducer shells or molds, so the brake drums, the brake discs, the speed reducer shells or the molds are excellent in performance, and the service life is prolonged.

Description

technical field [0001] The invention relates to the field of cast iron materials, in particular to a vermicular graphite cast iron material and a preparation method and application thereof. Background technique [0002] The automobile industry is the pillar industry of the national economy. Every technological progress in the automobile industry will bring significant economic and social benefits. Reducing energy consumption, reducing environmental pollution and saving limited resources are very important and urgent issues facing the development of today's automobile industry. The problem. [0003] In current vermicular graphite cast iron, the vermicularizer and inoculant are directly put into the bottom of the pouring treatment ladle during casting. This method has a low utilization rate of the alloy, a large amount of additives, and high processing costs. Trouble, the most important thing is that the creeping rate is low, which cannot meet the requirement of creeping, and...

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Problems solved by technology

[0003] In current vermicular graphite cast iron, the vermicularizer and inoculant are directly put into the bottom of the pouring treatment ladle during casting. This method has a low utilization rate of the alloy, a large amount of additives, and high processing costs. Trouble, the most important thing is that the creeping rate is low, which cannot meet the requirement of creeping, and the cast iron that does not meet the requirements needs to be returned to the furnace for resmelting, which increases the casting cost. The reasons such as low and poor comprehensive performance have seriously hindered its promotion and application.

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