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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

Inactive Publication Date: 2018-09-14
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a smelting process for free-cutting stainless steel containing bismuth, which overcomes the fact that the current bismuth powder will float on the surface of the melt after being added, and cannot be quickly fed into the molten metal. Inside the melt, it is easy to cause boiling and high volatility, which greatly affects its yield.

Method used

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

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Embodiment 1

[0043] This embodiment provides a kind of smelting process of bismuth-containing free-cutting stainless steel, which process comprises the following steps:

[0044] Step 1, ingredients and additions:

[0045] Weigh steel scrap, ferrochromium, ferromolybdenum, ferrosilicon, ferromanganese, carbon, silicon and bismuth powder pellets, weigh the carbon, silicon and bismuth powder pellets separately for use, and then prepare the scrap steel , ferrochromium, ferromolybdenum, ferrosilicon and ferromanganese are added to the vacuum furnace, wherein the bismuth powder is bismuth particles coated with copper or nickel, wherein the particle size of bismuth is 1mm, and the thickness of the copper cladding layer is 8μm;

[0046] The batching of raw materials is carried out according to the composition of elements in the steel ingot.

[0047] The steel ingot is composed of elements in the steel ingot by weight percentage: C: 0.026%, Si: 0.5%, Mn: 1.15%, Cr: 19%, Mo: 1.5%, P: 0.025%, S: 0....

Embodiment 2

[0061] This embodiment provides a kind of smelting process of bismuth-containing free-cutting stainless steel, which process comprises the following steps:

[0062] Step 1, ingredients and additions:

[0063] Weigh steel scrap, ferrochromium, ferromolybdenum, ferrosilicon, ferromanganese, carbon, silicon and bismuth powder pellets, weigh the carbon, silicon and bismuth powder pellets separately for use, and then prepare the scrap steel , ferrochromium, ferromolybdenum, ferrosilicon and ferromanganese are added to the vacuum furnace; among them, the bismuth powder pellets are bismuth particles coated with copper or nickel, and the particle size of bismuth is 2mm, and the thickness of the copper cladding layer is 10μm;

[0064] The batching of raw materials is carried out according to the composition of elements in the steel ingot.

[0065] The steel ingot, in terms of weight percentage, has the following elements: C: 0.026%, Si: 0.75%, Mn: 1.3%, Cr: 20%, Mo: 1.95%, P: 0.02%, ...

Embodiment 3

[0079] This embodiment provides a kind of smelting process of bismuth-containing free-cutting stainless steel, which process comprises the following steps:

[0080] Step 1, ingredients and additions:

[0081] Weigh steel scrap, ferrochromium, ferromolybdenum, ferrosilicon, ferromanganese, carbon, silicon and bismuth powder pellets, weigh the carbon, silicon and bismuth powder pellets separately for use, and then prepare the scrap steel , ferrochromium, ferromolybdenum, ferrosilicon and ferromanganese are added to the vacuum furnace; among them, the bismuth powder pellets are bismuth particles coated with copper or nickel, wherein the particle size of bismuth is 3mm, and the thickness of the nickel coating layer is 12μm;

[0082] The batching of raw materials is carried out according to the composition of elements in the steel ingot.

[0083] The steel ingot, in terms of weight percentage, is composed of elements in the steel ingot: C: 0.026%, Si: 1.0%, Mn: 1.5%, Cr: 21%, Mo:...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C22C38/60C22C38/22C22C38/02C22C38/04
CPCC22C33/06C22C38/002C22C38/02C22C38/04C22C38/22C22C38/60
Inventor 王发展赵申区达铨
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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