A kind of vermicular graphite cast iron material and its preparation method and application

Abstract

The invention discloses a vermicular graphite cast iron material, which comprises the following components by mass percentage: 3.0-3.9% of carbon, 2.3-3.0% of silicon, ≤0.4% of copper, ≤0.01% of chromium, and ≤0.02% of sulfur %, phosphorus is ≤0.07%, manganese is ≤0.5%, and the balance is iron and unavoidable impurities; the vermicular graphite cast iron material of the present invention is not easy to crack, has good heat dissipation, the tensile strength is as high as 523Mpa, and the creeping rate is as high as 95%. The present invention also discloses a preparation method of the vermicular graphite cast iron material. By adopting the bag bottom flushing method, a transfer bag is placed on one side of the embankment, and the transfer bag includes a vermicular agent, an inoculant, etc., so that the obtained vermicular graphite cast iron The material performance is excellent, and the creep rate is high. The invention also provides vermicular graphite cast iron for the production of brake drums, brake discs, reducer housings or molds, so that the performance of brake drums, brake discs, reducer housings or molds is improved. Excellent, extended life.

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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