High-strength free-cutting tin brass alloy material and preparation method thereof

Abstract

The invention relates to a high-strength free-cutting tin brass alloy material which contains the following chemical components in percentage by mass: 0.9-1.2% of bismuth, 7.3-7.7% of tin, 0.2-0.3% of selenium, 0.2-0.4% of aluminum, 14.3-14.6% of zinc, 0.2-0.25% of La, 5.1-6.3% of Ni, 0.1-0.14% of Sc and the balance of copper. The nickel and aluminum are added to enhance the tensile strength and hardness; by adding the La, Sc and bismuth, the alloy has the advantages of favorable cutting characteristic, favorable electric conductivity and no lead poisoning; by reasonably controlling the after-casting treatment temperature, feeding the raw materials in different batches and using waste copper as the raw material, the core hardness is basically consistent with the surface hardness, and the alloy quality is uniform; and the alloy can be widely used in automobiles, timekeepers, electric appliances, lock making, toys, bathroom accessories and other industries. When the refining agent is used for casting production, the porosity in the casting is lowered by 1-2 degrees, the oxide inclusion content is at level 2 or so, and the yield is obviously enhanced.

Description

technical field

[0001] The invention relates to the field of manufacturing metal alloy materials, in particular to a high-strength free-cutting tin-brass alloy material and a preparation method thereof. Background technique

[0002] Copper is widely used because of its good electrical conductivity, plasticity and corrosion resistance. Adding elements such as aluminum, nickel, manganese, tin, silicon, and lead to copper alloy can improve the performance of copper and be used in different places. At present, there are still some problems in the existing copper alloys in my country, such as the alloy contains a large number of impurity elements, poor high temperature fatigue, low high temperature strength; low hardness, poor wear resistance, large friction coefficient, short service life; poor conductivity, waste of electric energy; bending The processing performance is poor and it is easy to break; the quality is heavy and the construction is difficult; it cannot meet the mark...