A smelting process of synthetic nodular cast iron for making automobile brake bottom plate

Abstract

The invention provides a composite nodular cast iron melting technology for manufacturing of a base plate of an automobile brake. According to the composite nodular cast iron melting technology, 70%-80% of waste steel and 20%-30% of waste iron are used as raw materials, accessories comprise 0.3%-0.8% of silicon carbide and 3.0%-3.2% of carburant, and the raw materials and the accessories are fed into a medium-frequency induction melting furnace in three steps; the temperature is raised to 1400-1450 DEG C, data are analyzed with a thermal analysis molten iron ingredient management instrument, and original molten iron ingredients are adjusted and controlled to meet the data index requirement of a thermal analyzer; the temperature is raised to 1500-1550 DEG C, the molten iron is discharged out of the furnace, spheroidizing is conducted with a pour-over process, the application amount of a spheroidizing agent is 0.95%-1.15%, and the amount of inoculation silicon iron is 1.3%-1.8%; the pouring temperature is 1430-1450 DEG C, and the pouring time is controlled to be within 10 minutes; and an inoculant is Si-Ba inoculant with the particle size being 0.5 mm, and the ingredients of molten iron are controlled to comprise 3.5%-3.7% of C, 1.3%-1.4% of Si and not larger than 0.35% of Mn. By the adoption of the composite nodular cast iron melting technology for manufacturing of the base plate of the automobile brake, cyclic utilization of the waste steel and recirculated iron is achieved, the production cost of every ton of brake base plate castings can be reduced by 500-600 yuan, and the comprehensive mechanical performance of the castings is improved.

Description

technical field [0001] The invention relates to a material for a truck brake, in particular to a smelting process for making a bottom plate of the truck brake. Background technique [0002] At present, synthetic cast iron materials have gradually begun to be used in the production of domestic truck brake bottom plates, because synthetic cast iron has better metallographic structure and higher comprehensive mechanical properties than traditional cast iron. Due to the price difference between pig iron and scrap steel, synthetic cast iron Cast iron has a cost advantage over steel castings. In practical application, the amount of steel scrap used in the production of domestic synthetic cast iron generally accounts for 30-50% of the main material, and the proportion of steel scrap in the composition of synthetic ductile iron does not exceed 40%, and the raw material for production is basically pig iron. Due to the traditional smelting process of producing ductile iron castings w...

AI Technical Summary

Problems solved by technology

Due to the traditional smelting process of producing ductile iron castings with pig iron as raw material, the quality requirements of raw materials and production process are relatively high, and the purchase of pig iron as raw material requires a lot of capital, transportation and storage costs, so the corresponding comprehensive production cost is relatively high

At the same time, raw iron contains many kinds of trace elements and oxides, which are produced according to traditional techniques, which is not good for the quality of castings, and may cause potential safety hazards in the finished automotive castings