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Calcium treatment process of rod wire alloy steel

A technology for alloy steel, rods and wires, which is applied in the field of calcium treatment of alloy steels for rods and wires, which can solve problems such as the deterioration of inclusion levels, and achieve the effects of good castability, improved castability, and small size

Inactive Publication Date: 2012-08-15
NORTHEASTERN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of deterioration of inclusion level after calcium treatment of rod and wire alloy steel, the present invention provides a method for calcium treatment of rod and wire alloy steel, the purpose of which is to improve the cleanliness of molten steel, improve the pourability of molten steel, and control the calcium content of molten steel content

Method used

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  • Calcium treatment process of rod wire alloy steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment is described by producing rod and wire cold heading steel ML40Cr.

[0026] (1) The molten steel smelted in the converter is deoxidized by aluminum, so that the oxygen content in the molten steel is less than 10×10 -4 %, carry out LF refining, and control the composition of the slag in the refining process to be CaO: 65wt%, Al 2 o 3 : 26wt%, SiO 2 : 3wt%, MgO: 5wt%, FeO: 0.3wt%, the rest is impurities, LF refining time 30min;

[0027] (2) At the end of LF refining, feed the iron-calcium wire with a diameter of 12.4mm into the molten steel, in which the iron content is 64wt%, the calcium content is 30wt%, and the balance is impurities; the wire feeding speed is 200m / min to control the calcium in the molten steel Aluminum mass percentage is 0.16:

[0028] (3) After the wire feeding is completed, carry out soft argon blowing on the molten steel, the soft blowing time is 10min, and the soft blowing volume is controlled at 50NL / min;

[0029] (4) Carry out...

Embodiment 2

[0035] This embodiment is described by producing rod and wire prestressed steel 30MnSi.

[0036] (1) The molten steel smelted in the converter is deoxidized by aluminum, so that the oxygen content in the molten steel is less than 10×10 -4 %, carry out LF refining, and control the composition of the slag in the refining process to be CaO: 50wt%, Al 2 o 3 : 18wt%, SiO 2 : 25wt%, MgO: 6wt%, FeO: 0.9wt%, the rest is impurities, LF refining time 55min;

[0037] (2) At the end of LF refining, feed the silicon-calcium wire with a diameter of 13.6mm to the molten steel, in which the silicon content is 65wt%, the calcium content is 28wt%, and the balance is impurities; the feeding speed is 250m / min, and the control of the molten steel The mass percentage of calcium aluminum is 0.1;

[0038] (3) After the wire feeding is completed, blow argon softly to the molten steel, the soft blowing time is 10min, and the soft blowing volume is controlled at 20NL / min;

[0039] (4) Carry out RH ...

Embodiment 3

[0045] This embodiment is described by producing rod and wire gear steel 20CrMoH.

[0046] (1) The molten steel smelted in the converter is deoxidized by aluminum, so that the oxygen content in the molten steel is -4 %, carry out LF refining, and control the composition of the slag in the refining process to be CaO: 47wt%, Al 2 o 3 : 30wt%, SiO 2 : 12wt%, MgO: 9.9wt%, FeO: 0.5wt%, the rest is impurities, LF refining time 40min;

[0047] (2) At the end of LF refining, feed a solid calcium wire with a diameter of 10mm to the molten steel, in which the calcium content is 97%, and the remainder is impurities; the wire feeding speed is 50m / min, and the mass percentage of calcium and aluminum in the molten steel is controlled to be 0.08;

[0048] (3) After the wire feeding is completed, blow argon softly to the molten steel, the soft blowing time is 6 minutes, and the soft blowing volume is controlled at 30NL / min;

[0049] (4) Carry out RH vacuum treatment on the molten steel, co...

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Abstract

The invention belongs to the technical field of metallurgy of iron and steel, and particularly relates to a calcium treatment process of rod wire alloy steel. The invention adopts a converter smelting-LF (ladle furnace) refining-RH refining-square billet continuous casting production technique. The calcium treatment process is implemented in a way that: after the LF refining finishes, feeding an iron calcium wire, silico-calcium wire or solid calcium wire into molten steel at the linear speed of 50-250m / min to control the mass percent of calcium aluminum in the molten steel at 0.08-0.16%; after the soft blow, carrying out RH treatment; after the RH treatment finishes, carrying out calcium carbonate treatment, and feeding the iron calcium wire, silico-calcium wire or solid calcium wire into molten steel at the linear speed of 50-250m / min to control the mass percent of calcium aluminum in the molten steel at 0.04-0.08%; and carrying out soft blow, and casting. When the treatment process is used for producing high-quality steel, the inclusion level can not deteriorate, the castability of the molten steel is good, the number of continuous casting furnaces is increased, the calcium content of the molten steel is low but does not influence the casting performance, and the treatment process plastifies the inclusions and improves the mechanical properties of steel.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a calcium treatment method for rod and wire alloy steel. Background technique [0002] With the development of society, the industry has increasingly strict requirements on the comprehensive performance of steel, and urgent requirements for higher strength, higher safety, long life and low cost are put forward for alloy structural steel. A large number of studies have shown that inclusions in steel seriously affect various mechanical properties of steel. Therefore, it is extremely important to improve the purity of molten steel and control non-metallic inclusions in molten steel. In the metallurgical industry, on the one hand, through the application of various smelting processes, the content of inclusions becomes smaller and smaller, and the size becomes smaller; on the other hand, the inclusions are modified to make them easier to deform during the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C21C7/06C21C7/10
Inventor 朱苗勇邓志银田新中胡黎宁祭程阴峻峰钟保军戴永刚苏庆林
Owner NORTHEASTERN UNIV
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