A melting process of bismuth-containing free-cutting stainless steel

A stainless steel, easy-cutting technology, applied in the field of iron and steel metallurgy, can solve the problems that affect the yield, cannot be quickly fed into the molten metal, easy to cause boiling and high volatility, etc., to improve the yield and facilitate the promotion Utilizes and suppresses the effects of boiling and volatilization
CN107299272BInactive Publication Date: 2018-09-14XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
Publication Date
2018-09-14
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a smelting process of bismuth-containing free-cutting stainless steel. The bismuth-containing free-cutting stainless steel is obtained through batching and feeding, vacuum smelting, refining, air inflation and pressurization, adding bismuth powder and pellets, and pouring. In the present invention, the bismuth powder granules are quickly and evenly sprayed into the melt inside the vacuum furnace through the powder granule feeding mechanism under the action of compressed inert gas, which can effectively suppress the boiling and volatilization of bismuth, and improve the yield of bismuth. Thereby, a bismuth-containing free-cutting stainless steel with evenly distributed bismuth content is obtained. The smelting process of the bismuth-containing free-cutting stainless steel provided by the invention has the advantages of fast feeding speed, high melting material efficiency, high element recovery rate and significantly reduced burning loss rate. The bismuth-containing free-cutting stainless steel obtained by the invention has cutting performance equivalent to that of the lead-containing free-cutting stainless steel, has good environmental protection, and is favorable for popularization and utilization.
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Description

technical field

[0001] The invention belongs to the field of iron and steel metallurgy, relates to the smelting of stainless steel, in particular to a smelting process of bismuth-containing free-cutting stainless steel. Background technique

[0002] Lead-containing free-cutting stainless steel is widely used in machinery and automobile industries for cutting and processing various parts because of its superior cutting performance, but it must be replaced because it contains high-pollution lead, so it is important to find alternative products development trend. Because metal bismuth is non-toxic, and has a low melting point and high flexibility similar to metal lead, metal bismuth is currently recognized as one of the best environmentally friendly and easy-cutting elements to replace lead. Bismuth metal is used to replace lead, and other chemical components are compounded, so that the lead-free free-cutting steel not only has the free-cutting performance of lead-based free-c...

Claims

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