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Bismuth and tellurium composite addition process for free-cutting steel

A technology of free-cutting steel and process method, applied in the direction of manufacturing converters, etc., to achieve the effects of great economic value, improved quality, and low production cost

Active Publication Date: 2021-01-12
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventional prior art method to solve the volatilization loss of bismuth and tellurium is to consider the burned part to increase the additional amount when adding alloys

Method used

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  • Bismuth and tellurium composite addition process for free-cutting steel
  • Bismuth and tellurium composite addition process for free-cutting steel
  • Bismuth and tellurium composite addition process for free-cutting steel

Examples

Experimental program
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Effect test

Embodiment 1

[0061] In this embodiment, a bismuth-tellurium-tellurium-containing free-cutting steel method is described. The production process of bismuth-tellurium-containing carbon free-cutting steel is primary smelting→refining→wire feeding→continuous casting→rolling, in the LF furnace The composition of molten steel measured at the end of refining is C: 0.09%, Si: 0.04%, Mn: 0.95%, P: 0.09%, S: 0.35%, and the balance is iron and unavoidable residual elements. Cutting steel requires that at the end of molten steel refining, after the adjustment of other components other than bismuth and tellurium is completed, the feeding process of bismuth and tellurium cored wire is carried out to prepare the target bismuth and tellurium free cutting steel. The feeding line adding process method comprises the steps:

[0062] a. Control the production conditions before feeding the line, mainly to control the molten steel slag layer, temperature and oxygen activity to meet certain conditions:

[0063] ...

Embodiment 2

[0079] This embodiment is basically the same as Embodiment 1, especially in that:

[0080] In this embodiment, a bismuth-tellurium-tellurium-containing free-cutting steel method is described. The production process of bismuth-tellurium-containing carbon free-cutting steel is primary smelting→refining→wire feeding→continuous casting→rolling. The measured composition of molten steel is C: 0.14%, Si: 0.05%, Mn: 1.3%, P: 0.10%, S: 0.35%, and the balance is iron and unavoidable residual elements. The composition of molten steel conforms to the free-cutting steel Steel type requirements, at the end of molten steel refining, after the adjustment of other components other than bismuth and tellurium is completed, the feeding wire addition process of bismuth and tellurium cored wire is carried out to prepare the target bismuth and tellurium free cutting steel liquid, and the feeding wire Adding process method comprises the steps:

[0081] a. Control the production conditions before fee...

Embodiment 3

[0098] This embodiment is basically the same as the previous embodiment, and the special features are:

[0099] In this embodiment, a bismuth-tellurium-tellurium-containing free-cutting steel method is described. The production process of bismuth-tellurium-containing carbon free-cutting steel is primary smelting→refining→wire feeding→continuous casting→rolling. The measured composition of molten steel is C: 0.14%, Si: 0.05%, Mn: 0.8%, P: 0.10%, S: 0.25%, and the balance is iron and unavoidable residual elements. The composition of molten steel conforms to the free-cutting steel Steel type requirements, at the end of molten steel refining, after the adjustment of other components other than bismuth and tellurium is completed, the feeding wire addition process of bismuth and tellurium cored wire is carried out to prepare the target bismuth and tellurium free cutting steel liquid, and the feeding wire Adding process method comprises the steps:

[0100] a. Control the production ...

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Abstract

The invention discloses a bismuth and tellurium composite adding process method for free-cutting steel. The method is characterized in that at the end of refining, the addition of bismuth-containing core-spun yarn is carried out after the adjustment of components except bismuth is completed. The method comprises the following specific steps of: 1) control of production conditions before yarn feeding: control of the slag layer, the temperature and the oxygen activity of molten steel; 2) feeding of the bismuth-containing core-spun yarn; and 3) treatment after completion of the feeding, wherein in the step 2), the bismuth-containing core-spun yarn is fed at least three separate times at an interval of 10-20s by adopting an intermittent yarn feeding method, the feeding amount of the bismuth-containing core-spun yarn each time accounts for 1 / n of the total feeding amount of the bismuth-containing core-spun yarn and the n is the number of times; and the treatment is carried out after the yarn feeding. The method disclosed by the invention has the advantages that the yarn feeding process is stable without severe splashing; the bismuth element yield is high and greater than 30 percent, thetellurium yield is greater than 50 percent and the production cost is low; the shape of inclusions in the steel is good; the cutting performance of a steel product is excellent; and the method is suitable for the production of carbon free-cutting steel and free-cutting stainless steel and has great economic value in the field of bismuth-containing free-cutting steel.

Description

technical field [0001] The invention relates to a preparation process of free-cutting steel, in particular to a preparation method of compound-added lead-free free-cutting steel, which is applied in the technical field of iron and steel metallurgy. Background technique [0002] Free-cutting steel refers to a type of steel that adds a certain amount of easy-cutting elements to the steel to improve the cutting performance of the steel. Due to its good cutting performance, the tool life in machining is prolonged, the processing efficiency is improved, and the production cost is reduced. And the surface quality of the processed workpiece is good and it is widely used. According to the different free-cutting elements in steel, free-cutting steel can be divided into sulfur-based, lead-based, calcium-based, tellurium-based, composite free-cutting steel and other types. Among them, lead-containing free-cutting steels will cause environmental pollution problems during smelting and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00C22C38/02C22C38/04C22C38/40C22C38/60C21C5/34
CPCC21C5/34C21C7/0056C22C38/002C22C38/02C22C38/04C22C38/40C22C38/60
Inventor 付建勋孙晗张盼盼沈平吴翔宇
Owner SHANGHAI UNIV
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