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Magnesium-calcium addition process for non-quenched and tempered steel containing magnesium-calcium

A technology of non-quenched and tempered steel and process method, applied in the field of iron and steel metallurgy, can solve the problems of high alloy element concentration, increased production cost, serious element volatilization, etc., and achieves the effects of high yield, low production cost and excellent cutting performance.

Active Publication Date: 2021-05-07
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] (1) Under the process conditions provided by the above-mentioned patents, the volatilization of magnesium and calcium is relatively serious, and the yield is low, resulting in increased production costs;
[0011] (2) The above patents all use one-time feeding of all cored wires, which will lead to excessive concentration of alloy elements in the molten steel, serious element volatilization and easy to cause segregation problems

Method used

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  • Magnesium-calcium addition process for non-quenched and tempered steel containing magnesium-calcium
  • Magnesium-calcium addition process for non-quenched and tempered steel containing magnesium-calcium
  • Magnesium-calcium addition process for non-quenched and tempered steel containing magnesium-calcium

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Effect test

Embodiment 1

[0044] In this embodiment, a magnesium-calcium-containing non-quenched and tempered steel method for adding magnesium and calcium, the production process of magnesium-calcium-containing non-quenched and tempered non-quenched and tempered steel is primary smelting→refining→wire feeding→continuous casting→rolling, At the end of refining, the composition of molten steel was measured as C: 0.7%, Si: 0.3%, Mn: 0.6%, S: 0.06%, P: 0.02%, and the balance was iron and unavoidable trace elements. The composition of molten steel conformed to this Non-quenched and tempered steel requires that at the end of molten steel refining, after the adjustment of other components other than magnesium and calcium is completed, the feeding process of cored wire containing magnesium and calcium is carried out to prepare the target non-quenched and tempered steel containing magnesium and calcium , its feeding line adding process method comprises the steps:

[0045] a. Control the production conditions b...

Embodiment 2

[0063] This embodiment is basically the same as Embodiment 1, especially in that:

[0064] In this embodiment, a magnesium-calcium-containing non-quenched and tempered steel method for adding magnesium and calcium, the production process of magnesium-calcium-containing non-quenched and tempered non-quenched and tempered steel is primary smelting→refining→wire feeding→continuous casting→rolling, At the end of refining, the composition of molten steel was measured as C: 0.38%, Si: 0.6%, Mn: 0.14%, S: 0.055%, P: 0.025%, V: 0.05%, and the balance was iron and unavoidable trace elements. The composition of molten steel meets the requirements of this non-quenched and tempered steel type. At the end of molten steel refining, after the adjustment of other components other than magnesium and calcium is completed, the feeding process of cored wire containing magnesium and calcium is carried out to prepare the target magnesium-containing wire. Calcium non-quenched and tempered steel, its...

Embodiment 3

[0083] This embodiment is basically the same as the previous embodiment, and the special features are:

[0084] In this example, a magnesium-calcium-containing non-quenched and tempered steel-containing process method of magnesium-calcium, the production process of magnesium-calcium-containing non-quenched and tempered steel is primary smelting→refining→feeding line→continuous casting→rolling, at the end of refining The measured composition of molten steel is: C: 0.75%, Si: 0.80%, Mn: 1.60%, S: 0.070%, P: 0.035%, and the balance is iron and unavoidable trace elements. High-quality steel requires that at the end of molten steel refining, after the adjustment of other components other than magnesium and calcium is completed, the feeding process of cored wire containing magnesium and calcium is carried out to prepare the target non-quenched and tempered steel containing magnesium and calcium. The feeding line adding process method comprises the steps:

[0085] a. Control the pro...

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Abstract

The invention discloses a process method for adding magnesium and calcium to non-quenched and tempered steel containing magnesium and calcium. In the final stage of refining, after the adjustment of other components except magnesium and calcium is completed, the cored wire containing magnesium and calcium is added. The steps are as follows: production before wire feeding Condition control, controlling the slag layer, temperature and oxygen activity of the molten steel; the feeding of the magnesium-calcium-containing cored wire adopts the intermittent feeding method, and the magnesium-calcium-containing cored wire is fed intermittently for at least 3 times, each Feeding the cored wire each time accounts for 1 / n of the total amount added, n is the number of times, and the interval is 15-20s; the processing after the wire feeding is completed. The wire feeding process of the process of the present invention is stable without violent splashing; the recovery rate of magnesium and calcium elements is high, and the recovery rates of magnesium and calcium respectively reach more than 15% and 10%, and the production cost is low; the inclusions in the steel have good shape; cutting Excellent performance. It is suitable for the production of free-cutting non-quenched and tempered steel containing magnesium and calcium, and has great economic value in the field of free-cutting non-quenched and tempered steel.

Description

technical field [0001] The invention relates to a preparation process of non-quenched and tempered steel, in particular to a preparation method of magnesium-calcium-containing non-quenched and tempered steel, which is applied in the technical field of iron and steel metallurgy. Background technique [0002] Non-quenched and tempered steel refers to a high-quality structural steel whose performance meets the requirements of quenched and tempered steel by adding a certain amount of microalloy elements, through controlled rolling and controlled cooling, and canceling quenched and tempered heat treatment. It saves energy consumption and reduces pollution, so it is called "green and environmentally friendly steel". Although my country is a big country in steel production, the variety, output, technology, quality stability, and variety diversity of non-quenched and tempered steel in my country are compared with foreign powers. There is still a large gap, which affects the promotion ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00C22C38/60C22C38/04C22C38/02
CPCC21C7/0056C22C38/002C22C38/02C22C38/04C22C38/60
Inventor 付建勋曾志崎李志伟吴良平
Owner SHANGHAI UNIV
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