Production technology of high-phosphorus iron casting

Abstract

The invention provides a production technology of a high-phosphorus iron casting so as to solve the technical problems such as poor mechanical property, obvious cooling crack and high production cost of the high-phosphorus iron casting in the background technology. The production technology of the high-phosphorus iron casting includes the steps as follows: firstly, adding scrap steel and recarburizer into an induction intermediate frequency furnace; secondly, adding foundry returns; thirdly, adding pig iron; fourthly, adding ferrophosphorus, ferrosilicon and ferromanganese in sequence; fifthly, after 18-20min, raising the furnace temperature to 1480-1520 DEG C and conducting inoculation for multiple times by adopting Fe-Si and Si-Ba series; and sixthly, by a stream pouring inoculation way, finally obtaining the pearlite high-phosphorus iron casting with high strength under the condition of CE (carbon equivalent) higher or equal to 3.5%. The mechanical property and metallographic structure (graphite form, type A and pearlite) of the high-phosphorus iron casting prepared by the technology are both superior to the technique data of the product obtained under higher technology cost.

Description

technical field [0001] The invention relates to a production process of low-alloy gray iron castings, in particular to a production process of high-strength, high-rigidity and high-phosphorus iron castings. Background technique [0002] Among the machine tool guide rail castings, some are made of high phosphorus cast iron, which is a gray cast iron part with wear resistance requirements. The guide rail part works under sliding conditions and has contact fatigue wear. [0003] From the perspective of the matrix structure, the more pearlite in the matrix structure, the higher the hardness gradually, and the better the wear resistance. Tensile strength 300-350Mpa, pearlite quantity ≥ 90. [0004] According to the traditional charge composition and its specific process steps, the cost is relatively high, and in fact, the castings obtained by casting have different degrees of cold cracking, which also affects the strength and rigidity of the castings. Contents of the invention...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a new production process of high-phosphorus cast iron to solve the technical problems of poor mechanical properties of high-phosphorus cast iron, obvious cold cracking of castings and high production cost in the background technology

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