Inoculation line formula for gray cast iron feeding and inoculation and production process

Abstract

The invention provides an inoculation line formula for gray cast iron feeding and inoculation and a production process. The inoculation line formula comprises elements: 2.0-2.5% of magnesium, 50-58% of silicon, 1-3% of rare earth, 2.0-3.5% of barium, less than or equal to 1.5% of calcium, less than or equal to 2% of aluminum, and the balance iron. The production process of the inoculation line formula comprises the steps of selecting raw materials including, by mass, 60-65% of steel scraps, 30-35% of recirculated iron and 5-10% of pig iron to be proportioned; smelting and controlling the material compositions; and conducting feeding and inoculation through the inoculation line formula after pre-burying 0.15-0.2% of ferrosilicon to conduct inoculation on molten iron for the first time. Through rational chemical composition control, the actions of all the elements under different environments are given full play to, so that the tensile strength of a produced gray cast iron material is greater than or equal to 330 MPa, and the yield strength is greater than or equal to 220 MPa. As the inoculation line contains rare earth, the inoculation effect is enhanced, inoculation fade is effectively prevented, and inoculation is uniform. After gray cast iron casting through the inoculation line formula, the obtained gray cast iron is excellent in performance, small in hardness drop and highin stability.

Description

technical field [0001] The invention relates to an inoculation method of a gray cast iron material, in particular to an inoculation line formula and an inoculation process. The gray cast iron material is used for casting of machine tools, compression and other products. Background technique [0002] In the production of gray cast iron, ferrosilicon or silicon barium inoculants are generally used, and the inoculation of gray cast iron is carried out by the flushing method or the method of secondary inoculation tanks. Both production processes have uneven inoculation, and the production of gray cast iron has poor stability. Contents of the invention [0003] The present invention overcomes the problems of uneven and insufficient inoculation in the prior art, provides an inoculation line formula for preparing a gray cast iron feeding line inoculation, and adopts the formula for gray cast iron feeding line inoculation to produce castings, and solves the problem of The problem ...

AI Technical Summary

Problems solved by technology

[0003] The present invention overcomes the problems of uneven and insufficient inoculation in the prior art, provides an inoculation line formula for preparing a gray cast iron feeding line inoculation, and adopts the formula for gray cast iron feeding line inoculation to produce castings, and solves the problem of The problem of instability in the production of gray cast iron

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