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Magnesium Addition Technology for Free Cutting Steel Containing Magnesium

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 good inclusion shape, stable wire feeding process and excellent cutting performance

Active Publication Date: 2021-06-04
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Magnesium Addition Technology for Free Cutting Steel Containing Magnesium
  • Magnesium Addition Technology for Free Cutting Steel Containing Magnesium
  • Magnesium Addition Technology for Free Cutting Steel Containing Magnesium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] In this example, a magnesium addition process method for free-cutting steel containing magnesium, the production process of free-cutting stainless steel containing magnesium is electric furnace → AOD → LF → wire feeding → continuous casting → rolling, and the molten steel measured at the end of refining The composition is C: 0.13%, Si: 0.36%, Mn: 1.10%, P: 0.02%, S: 0.28%, Cr: 12.75%, Ni: 13.22%, the balance is iron and unavoidable trace elements, molten steel The composition meets the requirements of the free-cutting steel grade. At the end of molten steel refining, after the adjustment of other components except magnesium is completed, the process of adding magnesium-containing cored wire to the wire is carried out to prepare the target magnesium-containing free-cutting steel. Its feeding line adding process method comprises the following steps:

[0056] a. Control the production conditions before feeding the line, mainly to control the molten steel slag layer, temper...

Embodiment 2

[0074] This embodiment is basically the same as Embodiment 1, especially in that:

[0075] In this example, a magnesium addition process method for free-cutting steel containing magnesium, the production process of free-cutting stainless steel containing magnesium is electric furnace → AOD → LF → wire feeding → continuous casting → rolling, and the molten steel measured at the end of refining The composition is C: 0.13%, Si: 0.36%, Mn: 1.10%, P: 0.02%, S: 0.28%, Cr: 17.65%, Ni: 12.84%, the balance is iron and unavoidable trace elements, molten steel The composition meets the requirements of the free-cutting steel grade. At the end of molten steel refining, after the adjustment of other components except magnesium is completed, the process of adding magnesium-containing cored wire to the wire is carried out to prepare the target magnesium-containing free-cutting steel. Its feeding line adding process method comprises the following steps:

[0076] a. Control the production cond...

Embodiment 3

[0094] This embodiment is basically the same as the previous embodiment, and the special features are:

[0095] In this example, a magnesium addition process method for free-cutting steel containing magnesium, the production process of free-cutting stainless steel containing magnesium is electric furnace → AOD → LF → wire feeding → continuous casting → rolling, and the molten steel measured at the end of refining The composition is: C: 0.15%, Si: 1.00%, Mn: 1.20%, P: 0.09%, S: 0.35%, Cr: 19.0%, Ni: 14.0%, the balance is iron and unavoidable trace elements, steel The composition of the liquid meets the requirements of the free-cutting steel grade. At the end of molten steel refining, after the adjustment of other components except magnesium is completed, the process of adding magnesium-containing cored wire to the wire is carried out to prepare the target free-cutting steel containing magnesium. , its feeding line adding process method comprises the steps:

[0096] a. Control ...

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Abstract

The invention discloses a process method for adding magnesium to magnesium-containing free-cutting steel. In the final stage of refining, after the adjustment of other components except magnesium is completed, the addition of magnesium-containing cored wire is carried out. The specific steps are as follows: 1) Production before wire feeding Condition control, controlling the slag layer, temperature and oxygen activity of molten steel; 2) feeding of magnesium-containing cored wire; 3) processing after wire feeding, wherein, the step 2) adopts intermittent wire feeding method , Feed the magnesium-containing cored wire intermittently at least 3 times, each feeding of the cored wire accounts for 1 / n of the total amount added, n is the number of times, and the interval between each part of feeding is 15-20s. The process method of the present invention has the following advantages: 1) the wire feeding process is stable without violent splashing; 2) the yield of magnesium element is high, reaching more than 15%, and the production cost is low; 3) the shape of inclusions in steel is good; 4) cutting Excellent performance. It is suitable for the production of free-cutting stainless steel and has great economic value in the field of magnesium-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 magnesium-based free-cutting steel, which is applied in the technical field of iron and steel metallurgy. Background technique [0002] Stainless steel has excellent corrosion resistance and high temperature resistance, so it has been widely used. The production and consumption of stainless steel in my country are increasing every year. Because stainless steel has the characteristics of high toughness, high thermal strength, and small thermal conductivity, it has poor machinability, low tool life, low production efficiency, and high processing costs, which limits the use of stainless steel. application of materials. With the development of automation and high-speed machining of products, the machinability of stainless steel is far from being able to meet the growing demand for stainless steel materials in various industries. Therefore, all co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00C21C7/072C22C38/00C22C38/02C22C38/04C22C38/18C22C38/40C22C38/60
CPCC21C7/0006C21C7/0056C21C7/072C22C38/002C22C38/02C22C38/04C22C38/18C22C38/40C22C38/60
Inventor 付建勋吴翔宇吴良平李志伟
Owner SHANGHAI UNIV
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