Smelting process of steel for high-titanium alloy welding wire

A titanium alloy and welding wire technology, which is applied in the field of smelting steel for high-titanium alloy welding wire, can solve the problems of large amount of alloy added, insufficient purity of molten steel, poor pourability of molten steel, etc., and achieve good surface quality of casting billets and continuous casting Good pourability and smooth pouring process

Active Publication Date: 2012-07-18
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Deoxidation in the refining process is difficult, insufficient deoxidation will easily lead to high oxygen content in the steel, a large amount of alloys such as titanium and ferro-titanium are added, and the yield is unstable; the content of inclusions in the steel is high, the purity of molten steel is not enough, and the castability of molten steel in the pouring process is poor. The tundish nozzle is easy to nodulate, which affects the internal and external quality of the slab
Therefore, the smelting process of steel for high-titanium alloy welding wire (bar) in the prior art has no problems in controlling the purity of molten steel, ensuring the uniformity and stability of molten steel titanium, the surface quality of casting slabs, and the castability of molten steel. get well resolved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The smelting process of steel for high-titanium alloy welding wire, including electric furnace smelting process, refining furnace refining process, vacuum furnace degassing process, secondary refining process and continuous casting pouring process;

[0022] The weight percent chemical composition of steel for high titanium alloy welding wire is: C: 0.06%, Mn: 1.55%, Si: 0.60%, P: 0.020%, S: 0.010%, Cu: 0.15%, Ti: 0.18%, Al: 0.10%, the balance is Fe;

[0023] In the electric furnace smelting process, molten iron and steel scrap are added, of which molten iron accounts for 50% of the total charge, and cluster oxygen lances are used to supply oxygen for decarburization and slag dephosphorization. The tapping temperature is 1680°C, and the steel is tapped. Oxygen supply, add deoxidation furnace protection agent to reduce the oxygen content of molten steel in the electric furnace, and add aluminum alloy in the composite to strengthen the deoxidation of molten steel in the ea...

Embodiment 2

[0028] The smelting process of steel for high-titanium alloy welding wire, including electric furnace smelting process, refining furnace refining process, vacuum furnace degassing process, secondary refining process and continuous casting pouring process;

[0029] The weight percent chemical composition of steel for high titanium alloy welding wire is: C: 0.08%, Mn: 1.45%, Si: 0.80%, P: 0.010%, S: 0.020%, Cu: 0.10%, Ti: 0.16%, Al: 0.08%, the balance is Fe;

[0030] In the electric furnace smelting process, molten iron and steel scrap are added, of which molten iron accounts for 55% of the total charge, and cluster oxygen lances are used for oxygen decarburization and slagging dephosphorization. The tapping temperature is 1630°C, and the steel is tapped. Oxygen supply, add deoxidation furnace protection agent to reduce the oxygen content of molten steel in the electric furnace, and add aluminum alloy in the composite to strengthen the deoxidation of molten steel in the early st...

Embodiment 3

[0035] The smelting process of steel for high-titanium alloy welding wire, including electric furnace smelting process, refining furnace refining process, vacuum furnace degassing process, secondary refining process and continuous casting pouring process;

[0036] The weight percent chemical composition of steel for high titanium alloy welding wire is: C: 0.07%, Mn: 1.50%, Si: 0.70%, P: 0.015%, S: 0.015%, Cu: 0.05%, Ti: 0.17%, Al: 0.05%, the balance is Fe;

[0037] In the electric furnace smelting process, molten iron and steel scrap are added, of which molten iron accounts for 60% of the total charge, and cluster oxygen lances are used for oxygen decarburization and slagging dephosphorization. The tapping temperature is 1650°C, and the steel is tapped. Oxygen supply, add deoxidation furnace protection agent to reduce the oxygen content of molten steel in the electric furnace, and add aluminum alloy in the composite to strengthen the deoxidation of molten steel in the early st...

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PUM

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Abstract

The invention relates to a production process of steel, in particular to a smelting process of steel for a high-titanium alloy welding wire. The smelting process comprises the following steps of: in an electric furnace smelting step, adding molten iron and waste steel and tapping molten steel, wherein the molten iron accounts for 50-60% the total amount of the furnace charge, and the tapping temperature is not lower than 1630 DEG C; in a refining furnace refining step, adding silicon-aluminum-calcium deoxidant in a refining furnace for manufacturing white slag through diffusion deoxidization, and adding low-carbon ferromanganese and ferrosilicon according to steel grade component requirements and sampling component analysis to regulate components of the molten steel so as to reach temperature of 1630-1650 DEG C matching vacuum treatment; in a vacuum furnace degassing step, keeping the temperature for 10-15min under a low vacuum degree of 1 millibar, and carrying out secondary refining after vacuum breakage; and in a secondary refining step, adding low-aluminum ferrotitanium to regulate titanium content at the refining temperature of 1585-1600 DEG C, stirring for 1-2min, adding iron sulfide, stirring for 1-2min, taking a lollipop sample to analyze, continuously keeping static stirring, carrying out soft argon blowing for 15-40min after all components are qualified and carrying out continuous casting when the temperature is up to 1565-1585 DEG C. The smelting process disclosed by the invention can effectively control purification degree of the molten steel, ensures stability of titanium in the molten steel and improves the surface quality of a cast blank.

Description

technical field [0001] The invention relates to a production process of steel, specifically a smelting process of steel for high-titanium alloy welding wire. Background technique [0002] Alloy welding wire (bar) steel is used to produce welding materials. With the development of welding technology, the application range of welding materials is expanding day by day, and higher and higher requirements are put forward for the variety and quality of alloy welding wire (bar) steel. . From the perspective of the development of welding materials, gas shielded welding wire has become a trend. This type of welding wire is usually protected by CO2 during welding. During welding, due to the high temperature heat of the arc, CO2 gas decomposes into atomic oxygen, which has strong oxidizing properties. CO2 itself It is also an active gas with certain oxidation properties. The result of the oxidation reaction leads to a large amount of burning loss of alloy elements. If the amount of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/16C21C5/52C21C7/10C21C7/06
CPCY02P10/20
Inventor 李林吴惠荣陆斌
Owner NANJING IRON & STEEL CO LTD
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