Lock body steel easy to drill and fast in chip removal and preparation method thereof

Abstract

The invention discloses lock body steel easy to drill and fast in chip removal and a preparation method thereof, and belongs to the technical field of locks. The steel comprises the following chemical components in percentage by mass of 0.01-0.03% of C, 0-0.04% of Si, 1.6%-2.0% of Mn, 0.010%-0.030% of P, 0.40%-0.55% of S, 0.15%-0.22% of Bi, 0.005%-0.01% of Se, 0.003%-0.006% of T[O], 0.004%-0.006% of B and the balance of Fe and inevitable impurities. According to the steel, a certain amount of Bi and Se are compositely added, and the content of Mn and S in the steel is optimized, so that the sizes and forms of Mn (S, Se), ferrite and pearlite of the lock body steel are effectively controlled, the hardness of the steel is further reduced, the chip removal and breaking capabilities in the drilling process of the steel are improved, and the service life of a drill bit is prolonged; and in the preparation process, through forging, hot rolling, staged cooling and shot blasting processes, a lock body steel product with a matrix ferritic structure, a small amount of pearlite structures and excellent drilling performance is finally obtained, and the product is low in hardness, easy to drill, fast in chip removal, fast in heat dissipation and small in abrasion to a high-speed drill bit and can be widely used for manufacturing padlocks and calabash lock bodies.

Description

technical field [0001] The invention relates to the technical field of locks, in particular to a lock body steel which is easy to drill and has fast chip removal and a preparation method thereof. Background technique [0002] Padlocks are the oldest and largest family of locks in the world, and other locks are all derived from padlocks. Pujiang County, Zhejiang Province is currently the largest distribution center for the production and sales of padlocks in my country, with an annual output of more than 300,000 tons of padlocks. Padlocks are mainly divided into stainless steel padlocks, copper padlocks, iron padlocks and zinc alloy padlocks according to their materials. Among them, iron padlocks are the most commonly used due to their low price and good drilling performance, so the output is also the largest. [0003] At present, most of the iron padlocks on the market are made of HT200 gray cast iron. Although gray cast iron contains a large amount of spherical or flake gr...

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Problems solved by technology

[0005] The object of the present invention is to overcome the problem that gray cast iron is difficult to forge and roll the lock body steel in the prior art, and provide a lock body steel with easy drilling and fast chip removal and its preparation method; the present invention optimizes each Components, limit the content of hard elements and hard phases in the steel, avoid the wear of the drill bit due to temperature rise and phase change during the drilling process, and prolong the life of the drill bit; The size and shape of Mn(S, Se), ferrite and pearlite of the lock body steel are improved, the hardness of the steel is further reduced, and the chip removal, chip breaking ability and drill life of the drilling process are improved, and the obtained steel can be processed Integrated large-scale industrial production of casting and rolling

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