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Inclusion control method for rod and wire alloy steel

A control method and alloy steel technology, applied in the field of metallurgy, can solve problems such as excessive inclusions in alloy steel rods and wires, and achieve the effect of improving fatigue performance

Inactive Publication Date: 2012-04-04
NORTHEASTERN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a method for controlling inclusions in alloy steel rods and wires to solve the problem of excessive inclusions in alloy steel rods and wires, improve the cleanliness of molten steel, and improve the castability of molten steel

Method used

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  • Inclusion control method for rod and wire alloy steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: the present embodiment is illustrated by producing rod and wire rod cold heading steel 35CrMo;

[0025] (1) The molten steel smelted in the converter is deoxidized by aluminum, so that the volume percentage of oxygen 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: 57wt%, Al 2 o 3 : 22.1wt%, SiO 2 : 15wt%, MgO: 5wt%, FeO: 0.9wt%, LF refining time 30min;

[0026] (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 The mass percentage of aluminum is 0.16:1;

[0027] (3) After the wire feeding is completed, blow the molten steel with argon gas softly, the soft blowing time is 2min, and the soft blowing volume is controlled at 50NL / min; ...

Embodiment 2

[0033] The present embodiment is illustrated by producing rod and wire rod bearing steel GCr15;

[0034] (1) The molten steel smelted in the converter is deoxidized by aluminum, so that the volume percentage of oxygen 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: 45wt%, Al 2 o 3 : 30wt%, SiO 2: 15wt%, MgO: 9.5wt%, FeO: 0.5wt%, LF refining time 55min;

[0035] (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 0.1:1;

[0036] (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;

[0037] (4) Carry out RH ...

Embodiment 3

[0042] Present embodiment is described with the production wire spring steel 55SiCrA;

[0043] (1) The molten steel smelted in the converter is deoxidized by aluminum, so that the volume percentage of oxygen 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: 57wt%, Al 2 o 3 : 30wt%, SiO 2 : 3wt%, MgO: 9.9wt%, FeO: 0.1wt%, LF refining time 40min;

[0044] (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: 1;

[0045] (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;

[0046] (4) Carry out RH vacuum treatment on the mol...

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Abstract

The invention relates to the technical field of metallurgy, in particular to an inclusion control method for rod and wire alloy steel, which solves the problem of inclusion standard exceeding of the rod and wire material alloy steel, improves the molten steel cleanness and improving the molten steel casting performance. The method has the technical scheme that a production process of converter smelting, laser fusion (LF) refining, relative humidity (RH) refining and square blank continuous casting is adopted, the molten steel is subject to the calcium treatment after the LF refining completion during the production, and the RH treatment is then carried out after the soft blowing. The concrete steps are as follows: (1) the molten steel smelted by the converter is deoxidized by aluminum; (2) calcium wires are fed into the molten steel after the LF refining completion; (3) argon soft flowing is carried out on the molten steel after the wire feeding completion; (4) the molten steel is subject to RH vacuum treatment; (5) argon soft flowing is carried out on the molten steel after the RH vacuum treatment completion; and (6) tundish covering agents are added, and the continuous cast steel long nozzle argon blowing protection casting is adopted. The inclusion control method has the advantages that the production cost is greatly saved, and in addition, the inclusion grade is obviously reduced through being compared with that of the original process.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for controlling inclusions of rod and wire alloy steel. Background technique [0002] With the development of society, the requirements for the comprehensive performance of steel are becoming increasingly strict, and the 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 large-sized inclusions in steel seriously affect the fatigue properties and other mechanical properties of steel, especially for the fatigue properties of high-strength steels, large-sized inclusions become the main source of cracks. Among all inclusions, whether they are calcium aluminates, alumina or sulfides, although they have different effects on fatigue strength, they are mainly due to their different sizes. The size of inclusions becomes the most important factor controlling fatigu...

Claims

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Application Information

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IPC IPC(8): C21C7/00
Inventor 朱苗勇邓志银田新中胡黎宁阴峻峰张治广戴永刚苏庆林钟保军李智李富伟王秋坤
Owner NORTHEASTERN UNIV
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