High-strength nickel-containing gray pig iron and casting method thereof

Abstract

The invention discloses high-strength nickel-containing gray pig iron. The high-strength nickel-containing gray pig iron comprises the following elements, by mass, including 2.9%-3.4% of C, 1.3%-1.7% of Si, 0.05%-0.1% of S, 0.6%-1.0% of Mn, 0.4%-0.9% of Cu, 0.15%-0.4% of Cr, 0.1%-0.3% of Ni, less than 0.07% of P and the balance Fe and negligible impurities and elements. Mainly, steel scrap, recirculated iron, silicon carbide, a carburant, ferromanganese, copper, silicon iron and nickel are smelted into molten iron, ladle inoculation and ladle-to-ladle inoculation are sequentially carried out, and the high-strength nickel-containing gray pig iron is obtained through casting molding. The invention further discloses a casting method of the gray pig iron. The gray pig iron provided through the method is high in strength, a prepared engine wall is thin, and the requirement for the engine performance at present is met.

Description

technical field [0001] The invention relates to a gray cast iron and a casting method thereof, in particular to a high-strength nickel-containing gray cast iron and a casting method thereof. Background technique [0002] The main body of the diesel engine is usually made of gray cast iron. The current gray cast iron is usually cast by the following method: pig iron, scrap steel, returned iron and other alloys are added to the intermediate frequency furnace for melting into molten iron. Inoculant treatment, in which the particle size of the inoculant is required to be 3-8mm, and then 0.05-0.1% of the secondary inoculant is added during the pouring process to inoculate to obtain gray cast iron. But in the process of use, the gray cast iron cast in this way has low performance, the body strength is 220-250MPa, the body hardness is 180-200HBW, and the wall of the cast engine body is often thicker, with a thickness of 5-50mm. [0003] With the continuous upgrading of diesel engi...

AI Technical Summary

Problems solved by technology

However, if the wall thickness of the engine is reduced, the performance of the product will decrease. This is a contradictory relationship. In this contradictory situation, the original gray cast iron can no longer meet the demand, and a material with higher performance is needed Replace the original gray cast iron, so as to meet the needs of continuous upgrading of the engine