Gray cast iron and production method thereof

Abstract

The invention discloses a gray cast iron and a production method thereof. The gray cast iron comprises the following chemical components in percentage by weight: 3.1-3.3% of C, 1.8-2.2% of Si, 0.5-0.8% of Mn, 0-0.04% of P, 0.05-0.1% of S, 0.1-0.4% of Cr, 0.3-0.5% of Cu, 0-0.06% of Sn, Sb less than 0.02%, and the balance amount of Fe. The gray cast iron disclosed by the invention is suitable for producing casting parts which easily shrunk, have thick walls, and have marks above HT300; according to the production method of the gray cast iron, the technical means of adding copper, chrome, antimony and tin in molten iron for alloying in the gray cast iron production process is adopted, so that molybdenum and nickel for alloying in the prior art are replaced, thereby solving the problem of high possibility of shrinkage and looseness of gray cast iron products, after the prepared gray cast iron is used for casting and forming, the casting parts have low possibility of shrinkage and looseness, have no shrinkage hole, have high yield and are low in production costs.

Description

technical field [0001] The invention relates to a cast iron and a production method thereof, in particular to a gray cast iron and a production method thereof. Background technique [0002] Gray cast iron refers to cast iron with flake graphite. The main components are iron, carbon, silicon, manganese, sulfur and phosphorus. It is the most widely used cast iron, and its output accounts for more than 80% of the total output of cast iron. It can obtain thinner and complex castings than cast steel, and the residual internal stress and warping deformation in castings are smaller than cast steel. The performance of gray cast iron is relatively uniform in different sections, and it is suitable for large castings with high requirements and different sections. The wide application of gray cast iron is inseparable from its good casting formability, friction reduction, shock absorption and low cost. The mechanical properties of gray cast iron are related to the structure of the matr...

AI Technical Summary

Problems solved by technology

But on the one hand, due to the introduction of molybdenum and nickel components for alloying, it is easy to lead to a large tendency of shrinkage and porosity of the casting, which makes the casting performance poor and increases the risk of leakage of the casting. It is not suitable for the production of thick and large pieces, and the casting rejection rate is high; On the other hand, due to the relatively high price of metal molybdenum and nickel, the manufacturing cost of castings is high

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