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Tellurium Addition Technology of Free Cutting Steel Containing Tellurium

A technology of free-cutting steel and process method, which is applied in the field of iron and steel metallurgy to achieve the effects of reducing production costs, uniform distribution and improving quality

Active Publication Date: 2021-02-23
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 tellurium is to consider the burnt part to increase the additional amount when adding alloys

Method used

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  • Tellurium Addition Technology of Free Cutting Steel Containing Tellurium
  • Tellurium Addition Technology of Free Cutting Steel Containing Tellurium
  • Tellurium Addition Technology of Free Cutting Steel Containing Tellurium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] In this embodiment, a tellurium-containing free-cutting steel process method, the production process of tellurium-containing carbon free-cutting steel is primary smelting→refining→line feeding→continuous casting→rolling. The liquid composition is C: 0.08%, Si: 0.04%, Mn: 1.2%, P: 0.06%, S: 0.32%, and the balance is iron and unavoidable trace elements. The liquid steel composition meets the requirements of this free-cutting steel grade , at the end of molten steel refining, when the other components except tellurium are adjusted, the feeding wire addition process of tellurium-containing cored wire is carried out to prepare the target tellurium-containing free-cutting molten steel. The feeding wire addition process includes the following steps :

[0063] 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:

[0064] The thickness of the molten steel slag lay...

Embodiment 2

[0081] This embodiment is basically the same as Embodiment 1, especially in that:

[0082] In this embodiment, a tellurium-containing free-cutting steel process method, the production process of tellurium-containing carbon free-cutting steel is primary smelting→refining→line feeding→continuous casting→rolling. The liquid composition is C: 0.14%, Si: 0.05%, Mn: 1.3%, P: 0.10%, S: 0.33%, and the balance is iron and unavoidable trace elements. The liquid steel composition meets the requirements of this free-cutting steel type , at the end of molten steel refining, when the other components except tellurium are adjusted, the feeding wire addition process of tellurium-containing cored wire is carried out to prepare the target tellurium-containing free-cutting molten steel. The feeding wire addition process includes the following steps :

[0083] a. Control the production conditions before feeding the line, mainly to control the molten steel slag layer, temperature and oxygen activ...

Embodiment 3

[0101] This embodiment is basically the same as the previous embodiment, and the special features are:

[0102] In this embodiment, a tellurium-containing free-cutting steel process method, the production process of tellurium-containing carbon free-cutting steel is primary smelting→refining→line feeding→continuous casting→rolling. The liquid composition is C: 0.14%, Si: 0.05%, Mn: 0.8%, P: 0.10%, S: 0.25%, and the balance is iron and unavoidable trace elements. The liquid steel composition meets the requirements of this free-cutting steel type , at the end of molten steel refining, when the other components except tellurium are adjusted, the feeding wire addition process of tellurium-containing cored wire is carried out to prepare the target tellurium-containing free-cutting molten steel. The feeding wire addition process includes the following steps :

[0103] a. Control the production conditions before feeding the line, mainly to control the molten steel slag layer, tempera...

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Abstract

The invention discloses a tellurium adding technology method for tellurium containing free-cutting steel. In the final period of refining, after other components except tellurium are adjusted, tellurium containing core-spun yarn adding is conducted, and the tellurium adding technology method specifically comprises the following steps that firstly, production condition control is conducted before yarn feeding, and a slag layer, the temperature and the oxygen activity of molten steel are controlled; secondly, tellurium containing core-spun yarn feeding is conducted; thirdly, treatment after yarnfeeding is finished is conducted, wherein the intermittent yarn feeding method is adopted in the second step, the tellurium containing core-spun yarn is intermittently fed at least three times, the amount of the core-spun yarn fed each time accounts for 1 / n of the total adding amount, n is the number of the times, and the time interval is 10-20 s during feeding of each part. The technology methodhas the following advantages that firstly, the yarn feeding process is stable, and acute splashing is avoided; secondly, the tellurium element yield is high and reaches 65% or above, and the production cost is low; thirdly, the form of inclusions in steel is good; and fourthly, the cutting performance is excellent. The tellurium adding technology method is suitable for production of carbon free-cutting steel and free-cutting stainless steel, and very high economic value is achieved in the field of tellurium 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 tellurium-based free-cutting steel, which is applied in the technical field of iron and steel metallurgy. Background technique [0002] Free-cutting steel is widely used due to its good cutting performance, which prolongs the life of cutting tools during machining, improves machining efficiency, reduces production costs, and has good surface quality after machining. 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-based free-cutting steel is recognized as a steel with excellent cutting performance. However, due to environmental protection factors, the production and use of lead-based free-cutting steel is gradually restricted, and it will face the situation of being eliminated...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00C21C7/072C22C38/60C22C38/04C22C38/02C22C38/18C22C38/40
CPCC21C7/0056C21C7/072C22C38/02C22C38/04C22C38/18C22C38/40C22C38/60
Inventor 付建勋沈平吴良平张盼盼李志伟
Owner SHANGHAI UNIV
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