Copper-antimony alloy spheroidal graphite cast iron material for crank shafts and preparation method thereof

Abstract

The invention discloses a copper-antimony alloy spheroidal graphite cast iron material for crank shafts and a preparation method thereof. The copper-antimony alloy spheroidal graphite cast iron material for the crank shafts comprises the following chemical components:3.60-3.90 of C, 2.00-2.80 of Si, 0.30-0.50 of Mn, no more than 0.06 of P, no more than 0.03 of S, 0.02-0.05 of Re, 0.02-0.06 of Mg, 0.40-0.60 of Cu, 0.01-0.05 of Sb and the balance of Fe. The copper-antimony alloy spheroidal graphite cast iron material for the crank shafts can ensure that the mechanical strength of the spheroidal graphite cast iron crank shaft is greatly enhanced, the defective rate of the copper-molybdenum alloy spheroidal graphite cast iron crank shaft and the potential risk of shrinkage porosity of the crank shaft core are reduced, the production cost is greatly lowered and the economic value of the copper-antimony alloy spheroidal graphite cast iron crank shaft is increased.

Description

Technical field [0001] The invention relates to a copper-antimony alloy ductile iron material for crankshafts and a preparation method thereof. Background technique [0002] The crankshaft is a heart component of the engine and the power source of the engine. Its material is carbon structural steel or ductile iron. With the rapid development of ductile iron casting technology, a large number of crankshafts now use ductile iron. The crankshaft carries complex loads in the engine, and the crankshaft material must have high strength and toughness, that is, it must have better comprehensive mechanical properties. Therefore, the comprehensive performance of ductile iron crankshafts is improved by adding alloy elements such as copper and molybdenum during casting. [0003] In the past, most cast ductile iron crankshafts used copper-molybdenum alloy ductile iron materials. Because copper can reduce the critical range of austenite eutectoid transformation, it is helpful to the formation ...

AI Technical Summary

Problems solved by technology

However, since molybdenum is a strong carbide-forming element in ductile iron, it is easy to hinder the precipitation of graphite, causing the shrinkage cavity and porosity of ductile iron to be serious, and the center of the crankshaft is prone to shrinkage and porosity, resulting in waste loss

Moreover, molybdenum alloy is expensive, and when adding a large amount of phase, it is generally 0.2-0.35% molybdenum, and the cost of the product is relatively increased.

Images