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A kind of steel for high-titanium alloy welding wire and its preparation method

A high-titanium alloy and titanium alloy technology, applied in the field of iron and steel materials, can solve the problems of deterioration of mold flux performance, large fluctuation of welding current, quality problems of continuous casting billets, etc., to achieve stable current, refinement of molten droplets, and improvement of weld quality. Effect

Inactive Publication Date: 2016-06-15
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] High titanium alloy welding wire is the main material for gas shielded welding at present. This kind of steel generally requires the control range of Ti to be within 0.10%-0.25%. At present, there are two main problems in this kind of steel: one is that high titanium alloy welding wire steel Titanium is easy to oxidize and enter into mold flux during casting, causing deterioration of mold flux performance, resulting in quality problems of continuous casting slabs; 2 Oxidation also exists in the atmosphere. If the amount of alloy is insufficient and the deoxidation is insufficient, it will cause pores in the weld, especially the unevenness of the droplet will cause large fluctuations in the welding current. Therefore, the titanium alloy elements in the high-titanium alloy welding wire steel should be accurately controlled. Within an appropriate range, this requires controlling the oxidation of titanium elements in the continuous casting process and welding process of steel; the continuous casting process controls the oxidation of titanium elements mainly through continuous casting protection casting, but the performance of continuous casting mold slag needs to be further improved. The problem of optimization has not been solved; the problem of controlling the oxidation of alloy elements in the welding process is mainly through gas shielded welding, but currently CO 2 Atmosphere protection, there are still alloying elements being destroyed by CO 2 Oxidation problem; therefore, at present, it is necessary to develop a new material that can control the oxidation of alloying element titanium in the welding process of continuous casting machine starting from the high titanium alloy welding wire material itself

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The chemical composition of high titanium alloy welding wire steel is (weight percentage): C0.07%, Si0.70%, Mn1.50%, Ti0.16%, RE0.016%, S0.010%, Al0.08%, P0.020%, Cu0.10%, the rare earth RE in this embodiment refers to a mixture of Sc, Ce and Er in a mass ratio of 1:1:2.

[0014] The smelting process of the high-titanium alloy welding wire steel in this embodiment is as follows: smelting by electric arc furnace, charging molten iron and scrap steel, the scrap steel loading is 50%, oxygen blowing and ore oxidation slagging dephosphorization, decarburization, carbon After the composition is qualified, the steel is tapped at 1650℃. During the tapping process, ferromanganese and ferrosilicon are added for pre-deoxidation and silicon and manganese alloying. After adjusting the silicon and manganese components to meet Si0.70% and Mn1.50%, add aluminum iron for deep deoxidation , The amount of aluminum and iron added is to control the aluminum content to 0.08%; then enter the ref...

Embodiment 2

[0017] The chemical composition of high-titanium alloy welding wire steel is (weight percentage): C0.07%, Si0.70%, Mn1.50%, Ti0.18%, RE0.020%, S0.010%, Al0.10%, P0.010%, Cu0.10%, the rare earth RE in this embodiment refers to a mixture of Sc and Ce at a mass ratio of 1:1.

[0018] The smelting process is as follows: using electric arc furnace smelting, charging molten iron and scrap steel, the amount of scrap steel is 50%, using oxygen blowing and adding ore oxidation slagging dephosphorization and decarburization, after the carbon content is qualified, the steel is tapped at 1650℃, and the steel is tapped During the process, ferromanganese and ferrosilicon are pre-deoxidized and alloyed with silicon and manganese. After adjusting the components of silicon and manganese to meet Si0.70% and Mn1.50%, add aluminum-iron for deep deoxidation. The amount of aluminum-iron added is to control the aluminum content. 0.10%; then enter the refining process, add aluminum silicate calcium (ASC...

Embodiment 3

[0021] The chemical composition of high titanium alloy welding wire steel is (weight percentage): C0.06%, Si0.70%, Mn1.50%, Ti0.15%, RE0.020%, S0.010%, Al0.10%, P 0.008%, Cu 0.07%, the rare earth RE in this embodiment refers to a mixture of Sc and Er in a mass ratio of 1:6.

[0022] The smelting process is as follows: using electric arc furnace smelting, charging molten iron and scrap steel, the amount of scrap steel is 50%, using oxygen blowing and adding ore oxidation slagging dephosphorization and decarburization, after the carbon content is qualified, the steel is tapped at 1650℃, and the steel is tapped During the process, ferromanganese and ferrosilicon are pre-deoxidized and alloyed with silicon and manganese. After adjusting the components of silicon and manganese to meet Si0.70% and Mn1.50%, add aluminum-iron for deep deoxidation. The amount of aluminum-iron added is to control the aluminum content. 0.10%; then enter the refining process, add aluminum silicate calcium (A...

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Abstract

The invention belongs to the field of iron and steel materials, and particularly relates to a steel material for high-titanium alloy welding wire, which is characterized in that the chemical composition of the steel is calculated by weight percentage: 0.06%≤C≤0.08%, 0.60%≤Si≤0.80%, 1.45% ≤Mn≤1.55%, 0.15%≤Ti≤0.18%, 0.010%≤RE≤0.020%, 0.010%≤S≤0.020%, P≤0.020%, Al≤0.10%, Cu≤0.10%, the balance is Fe; The rare earth RE in the present invention refers to a mixture of one or more of Sc, Ce and Er in any mass ratio. The main difference between the high-titanium alloy welding wire steel of the present invention and the high-titanium alloy welding wire steel produced in the prior art is that it contains RE components, which can inhibit the oxidation of the alloy welding wire in the continuous casting process, and overcome the protection caused by titanium oxidation entering the mold slag. The continuous casting quality problems caused by slag denaturation, and RE elements can control and reduce titanium oxidation during welding, and have the functions of refining molten droplets, stabilizing current, and improving weld quality.

Description

Technical field [0001] The present invention belongs to the field of steel materials, and specially involves a steel material and preparation method for high titanium alloy welding wires. Background technique [0002] High-titanium alloy welding wire is the main material of the current gas protection welding. This type of steel generally requires the control range of TI within 0.10%-0.25%. At present, there are two main problems in this type of steel: First, the high titanium alloy welding wire steel is in connectionDuring casting, titanium is easy to oxidize into the protection residue caused by deteriorating the performance of the residue, resulting in the quality of the linked gray; the second is that the alloy element is in the CO during welding 2 There is also oxidation in the atmosphere. If the amount of alloy is insufficient and the dehydration is not sufficient, it will cause air holes in the weld, especially the uneven melting droplets will cause the welding current to f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16
Inventor 李桂荣王宏明黄梓汐马卓南
Owner JIANGSU UNIV