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Steel-liquid with vanadium and nitrogen alloying composite wire

A technology of nitrogen alloying and cored wire, applied in the field of cored wire, can solve the problems of low recovery rate, vanadium loss, lack of ductility, etc., and achieve the effect of convenient application and improved recovery rate

Inactive Publication Date: 2006-08-16
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The reason for the low recovery rate of the above-mentioned vanadium and nitrogen alloy elements is that the density of vanadium nitride (VN) alloy is lower than that of molten steel, and because vanadium nitride (VN) is sintered and has no ductility, usually it can only be made Added into molten steel in block or spherical shape, after adding vanadium nitride (VN) alloy floats on the surface of molten steel and cannot be well dissolved into molten steel, resulting in partial loss of vanadium and nitrogen

Method used

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  • Steel-liquid with vanadium and nitrogen alloying composite wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: VN12 vanadium nitride alloy is selected, the chemical composition of VN12 vanadium nitride alloy is V 79.0%, N 11.5% by weight percentage, and the rest are impurity elements. The VN12 vanadium nitride alloy is crushed into 0-3mm powder with a crusher, and the chemical composition of the prepared powder is V 80.0%, N 11.5% by weight, and the rest is Fe and impurity elements. The ST12 cold-rolled steel strip with a thickness of 0.35mm is used as the outer layer 2, and the above powder is wrapped as the core layer 1 on the core wrapping equipment to make a cored wire with an outer diameter of 12mm. The weight per meter of the finished cored wire is 360-380g, of which the weight of the steel tare is 120g, and the weight of the powder is 240-260g.

[0015] In the 125 tons of molten steel after refining in the ladle refining furnace, 800 meters of the above-mentioned cored wire containing VN12 vanadium nitride alloy is fed into the depth of the molten steel by u...

Embodiment 2

[0016] Embodiment 2: press VN12 vanadium nitride alloy: the ratio of Ti30A titanium alloy=3.33:1, choose VN12 vanadium nitride alloy and Ti30A alloy respectively, wherein the chemical composition of VN12 vanadium nitride alloy is V 78.5%, N 11.6%, and the rest are impurity elements. The chemical composition of Ti30A titanium alloy is 29.5% by weight, and the rest are Fe and impurity elements. The alloy of the above ratio is crushed into 0-3mm powder with a crusher, and physically mixed with a mixer. The chemical composition of the prepared powder is 60.4% by weight, N8.9%, Ti 6.8%, and the rest is Fe and impurity elements. The ST12 cold-rolled steel strip with a thickness of 0.4mm is used as the outer layer 2, and the above-mentioned powder is wrapped as the core layer 1 on the core wrapping equipment to make a cored wire with an outer diameter of 14mm. The weight of the finished cored wire per meter is 500-520g, of which the weight of the steel tare is 160g, and the weight o...

Embodiment 3

[0018] Embodiment 3: select alloy respectively by the ratio of VN12 vanadium nitride alloy: Ti30A titanium alloy: Nb60 niobium alloy=3.33: 1: 1, wherein the chemical composition of VN12 vanadium nitride alloy is V 79.5%, N 11.5% by weight percentage , and the rest are impurity elements. The chemical composition of Ti30A titanium alloy is Ti 29.0% by weight, and the rest are Fe and impurity elements. The chemical composition of Nb60 niobium alloy is Nb59.4% by weight, and the rest are Fe and impurity elements. The alloy of the above ratio is crushed into 0-3mm powder with a crusher, and physically mixed with a mixer. The chemical composition of the prepared powder is V 49.7%, N 7.2%, Ti5.4%, Nb11.1 %, the rest are Fe and impurity elements. The ST12 cold-rolled steel strip with a thickness of 0.35mm is used as the outer layer 2, and the above powder is wrapped as the core layer 1 on the core wrapping equipment to make a cored wire with an outer diameter of 14mm. The weight of t...

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Abstract

The invention opened a core-spun yarn for reach the molten steel vanadium and the nitrogen alloying. It includes the sandwich layer and the steel outer layer. The sandwich layer contains the vanadium nitride alloying. After tapping or refining the molten steel, the core-spun yarn is dipped into the molten steel to add the vanadium, nitrogen and the other alloying agent. Because the vanadium nitride alloying is dipped into the steel liquid, the percent recovery of the vanadium can be improved by 5% and it can be controlled above 92%, the N is 10-20% and above 80%.

Description

technical field [0001] The invention relates to a cored wire used for alloying liquid steel with vanadium and nitrogen in smelting. Background technique [0002] In the prior art, vanadium nitride (VN) alloys are generally block or spherical, and there are usually two ways to add it to molten steel to achieve vanadium and nitrogen alloying: 1. Add it directly to the ladle before and after tapping Blocky or spherical vanadium nitride (VN) alloys, using this method to smelt alloy steel, the recovery rate of vanadium and nitrogen alloy elements is not high, the recovery rate of vanadium is 85-90%, and the recovery rate of nitrogen is 50-65%; ( 2) In the vacuum treatment, block or spherical vanadium nitride (VN) alloy is added to the molten steel surface through the alloy silo, and the alloying is realized through the circulation of molten steel. Since this method is added under high temperature and vacuum, nitrogen Vanadium is easy to decompose and release nitrogen from molten...

Claims

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Application Information

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IPC IPC(8): C21C7/00C22C33/04
Inventor 李扬洲刘明程兴德李军张开坚
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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