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A Composite Free Cutting Steel Containing Tin and Bismuth
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A free-cutting steel, tin-bismuth technology, applied in the fields of iron and steel metallurgy and material engineering, can solve the problems of high hot brittleness of free-cutting steel, and achieve the effect of good cutting performance and rolling performance
Inactive Publication Date: 2017-08-11
FUZHOU UNIV
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[0003] The purpose of the present invention is to provide a composite free-cutting steel containing tin and bismuth, which solves the problems of high thermal brittleness of the free-cutting steel caused by excessive tin content, and the obtained composite free-cutting steel has good cutting performance and can be used to prepare high-speed CNC machine tools. Processing of instrumentation, watch parts, automobiles, machine tools, and various other components that require machines with high cutting performance
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preparation example Construction
[0019] The preparation method of the composite free-cutting steel containing tin and bismuth mainly includes four steps of melting, alloying, slagging, tapping and rolling, and its specific preparation method is as follows:
[0020] 1) Melting: Put ferromanganese, ferrophosphorus, ferrosulfur, industrial pure iron, and recarburizer into the induction furnace, cover the lid, vacuumize, and send electricity to make it melt; after melting, keep it for 1 minute;
[0021] 2) Alloying: add tin metal material in a vacuum state, then add bismuth metal material into molten steel when the temperature of molten steel is lower than 1560°C, and add pure aluminum to deoxidize at the same time;
[0022] 3) Slagging: add pure calcium wire to deal with inclusions, and the alkalinity of slagging is 3.0;
[0023] 4) Tapping: keep warm for 1-1.5 minutes to break the vacuum after making the composition of molten steel uniform, tap after 1 minute, and air-cool;
[0024] 5) Rolling: The rolling sta...
Embodiment 1
[0026] A compound free-cutting steel containing tin and bismuth, the weight percent of its main components is: C 0.06%, Si 0.06%, Mn 1.30%, P 0.08%, S 0.35%, Bi 0.003%, Sn 0.1%; the balance is Fe and residual trace elements.
Embodiment 2
[0028] A compound free-cutting steel containing tin and bismuth, the weight percent of its main components is: C 0.08%, Si 0.08%, Mn 1.50%, P 0.10%, S 0.40%, Bi 0.003%, Sn 0.1%; the balance is Fe and residual trace elements.
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Abstract
The invention discloses composite free-cutting steel containing Sn and Bi. The composite free-cutting steel comprises the following main components in percentage by weight: 0.06-0.09% of C, no less than 0.10% of Si, 1.30-1.60% of Mn, 0.08-0.12% of P, 0.35-0.45% of S, 0.003% of Bi and 0.1% of Sn. The composite free-cutting steel has good cutting performance and rolling performance; the problems in the prior art that the free-cutting steel is high in hot shortness because of the overhigh content of Sn, and the like are solved; and the composite free-cutting steel can be used for manufacturing numerical control machine tool high-speed machining instruments, watch parts and parts of automobiles, machine tools and other machines requiring high cutting performance.
Description
technical field [0001] The invention belongs to the field of iron and steel metallurgy and material engineering, in particular to a composite free-cutting steel containing tin and bismuth. Background technique [0002] At present, with the development of lead-free free-cutting steel, two kinds of free-cutting steels with tin and bismuth are more researched at home and abroad. Adding tin and bismuth to free-cutting steel can greatly improve its cutting performance. However, relevant studies have found that excessive tin content in free-cutting steel may cause problems such as poor rollability and poor surface quality. The invention adds a proper amount of bismuth while reducing the tin content in the free-cutting steel to prepare a composite free-cutting steel containing tin and bismuth. Contents of the invention [0003] The purpose of the present invention is to provide a composite free-cutting steel containing tin and bismuth, which solves the problems of high thermal ...
Claims
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