Production method of novel nitrogenous commercial vehicle cylinder body material

Abstract

The invention provides a production method of a novel nitrogenous commercial vehicle cylinder body material. The production method comprises the following steps: determining standard requirements of the commercial vehicle cylinder body material; pig iron, scrap steel and foundry returns are put into an intermediate frequency furnace to be melted, and components are adjusted after melting; silicon carbide alloy is added, and silicon components are adjusted; and after the components are adjusted, tapping inoculation treatment is carried out, pouring is carried out, and during tapping, the adding amount of an inoculant in a pouring ladle is 0.3%, and the adding amount of nitrided ferromanganese is 0.5%. The nitrogen content of the molten iron is controlled to be 0.006-0.012%, the manganese element is controlled to be 0.6-0.8%, and the nitrogen-containing commercial vehicle cylinder body material is cast. According to the method, improvement is carried out on the basis of traditional process production, compound alloy is adopted for strengthening, and the strengthening principle also has the precipitation strengthening effect besides alloy strengthening; the addition of ferromolybdenum is eliminated, and silicon carbide and manganese nitride are used for production, so that a very good effect is achieved; the material performance of the cylinder body is successfully improved, and the production cost of the cylinder body is not increased.

Description

technical field [0001] The invention belongs to the technical field of commercial vehicles, and in particular relates to a method for producing a novel nitrogen-containing commercial vehicle cylinder block material. Background technique [0002] Generally, the cylinder blocks of large commercial vehicles are made of gray cast iron (vermicular graphite cast iron is used in a small amount) for production. With the continuous improvement of energy saving and emission reduction standards and the double "improvement" requirements of the continuous improvement of diesel engine power design, higher requirements are also placed on the performance of cylinder block materials. Judging from the materials of the engine block produced by the FAW factory, from the past HT200 to today's HT250, the weight of the engine block has also developed from about 100kg in the past to about 300-350kg today. Higher material grade requirements and heavier castings have put forward higher requirements ...

AI Technical Summary

Problems solved by technology

[0004] However, the shortcomings of the original cast iron material production process are becoming more and more prominent, such as: 1. The tensile strength is too low to meet the design requirements of high-performance diesel engines; 2. It is necessary to use a large number of precious alloys to improve material performance, such as molybdenum alloy elements, lead to high production costs

3. Due to the use of molybdenum alloy elements, it is easy to cause the cylinder body to be too hard, difficult to process, and low in processing efficiency.

[0006] However, this treatment process mainly adopts the alloying of a single metal element to strengthen the hardness and strength. The strengthening principle is mainly alloy strengthening, which is difficult to process and high in cost.

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