Nucleating agent for improving pearlite, using method and cylinder body adopting nucleating agent

Abstract

The invention relates to the field of metal materials, and discloses a nucleating agent for improving pearlite. The nucleating agent comprises the chemical components of, by weight, 0.49-0.51 part of silicon carbide, 0.025-0.035 part of tin, 0.025-0.035 part of antimony, 0.4-0.5 part of silicon-manganese-chrome special nucleating agent, and 0.07-0.09 part of strontium-silicon. The invention further discloses a method for improving the pearlite by the nucleating agent. The method specifically comprises the following steps that first, the silicon carbide accounting for 0.5+ / -0.01% of liquid iron is added into the surface of the liquid iron, and stirring is conducted for 3+ / -1 min, wherein the temperature of the liquid iron is 1450+ / -50 DEG C; second, 0.03+ / -0.005% of the tin, 0.03+ / -0.005% of the antimony and 0.45+ / -0.05% of the silicon-manganese-chrome special nucleating agent are added into a liquid iron transfer ladle, and the elements are transferred into a pouring ladle after being poured into the iron liquid; and third, 0.8+ / -0.01% of strontium and silicon are adopted for metal-stream inoculation in the whole process of pouring. According to the nucleating agent and the method, it is ensured that the pearlite at a thin wall is larger than 95%, and the physical property of a cylinder can be improved effectively.

Description

technical field [0001] The invention relates to the technical field of engine cylinders, in particular to an inoculant for promoting pearlite, a use method and a cylinder using the inoculant. Background technique [0002] The cylinder block assembly of the engine is mainly composed of the cylinder block, cylinder or cylinder liner, cylinder head, cylinder head gasket and oil pan, etc. The cylinder block assembly is the skeleton of the engine, which is installed with all the main parts and accessories of the engine, and withstands various movements during the movement. kind of load. Therefore, there are very high requirements on the material of the cylinder body. The matrix structure determines the material of the cylinder body. Usually, the pearlite at the 3±0.5mm wall thickness of the cylinder body is only 40-50%, which seriously restricts the service life of the cylinder body. . [0003] CN201510476382.X discloses an inoculant for cast iron, which relates to the field of...

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Problems solved by technology

[0004] However, after such an inoculant is added, the pearlite at the 3±0.5mm wall thickness of the cylinder is still only 40-50%, which also cannot meet the requirements of improving the life of the cylinder

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