Most quenched and tempered steel materials for Mitsubishi Engine are conventional materials such as 45, 42CrMo, 40Cr, 35CrMo, etc., which have the advantages of low price and wide application of materials.

The disadvantage is that the connecting rod blank needs heat treatment after forging, which pollutes the environment and has high production process costs. Due to the influence of its material properties, quenched and tempered steel is only suitable for flat-cut connecting rods, so it is currently used less and less.

Non-quenched and tempered steel materials are added with trace alloying elements such as vanadium, titanium, vanadium, and sulfur on the basis of medium carbon steel.

Carbon and nitrogen compounds appear in the basic elements, and the cooling rate during rolling and forging is adjusted by Mitsubishi Engine to strengthen the material.

At present, most connecting rod materials are special materials such as 35MnV, C70S6, 36MnVS4, 46MnVS5, etc. The advantage is that the heat treatment after forging of the blank is reduced, there is no environmental pollution, and the cost of the production process is reduced; the disadvantage is that the price is high and can only be applied to specific industries.

The composition of Bare Engine materials can basically be divided into two types: powder metallurgy and forged steel. Powder metallurgy materials are very commonly used in North American Bare Engine manufacturing.

At present, forged steel materials are mainly used in China, and different materials have their own advantages in their properties. However, the two materials have a great difference in the proportion of manufacturing costs.

For blank manufacturing, forged steel is about 35% and metallurgical powder is about 60%. But in machining, forged steel is about 48% and metallurgical powder is about 40%. Comprehensively calculating the cost, the industry currently mostly uses forged steel materials, and powder metallurgy materials also need to be studied.