Micro-alloy reinforcing agent and application and application method thereof

An application method and micro-alloy technology, applied in the field of micro-alloy reinforcing agent, can solve the problems of large fluctuation of steel performance effect, poor performance matching of micro-alloy steel, poor process stability, etc., so as to improve the strengthening effect, The effect of improving utilization and smoothing sensitivity

Inactive Publication Date: 2016-12-21
马鞍山市恒兴耐火炉料厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems that the effect of trace alloy elements added in the existing iron and steel smelting process cannot be fully exerted, the effect of improving steel properties fluctuates greatly, the process stability is not good, the application cost is high, and the performance matching of microalloy steel is not good, etc. , the present invention provides a microalloy reinforcing agent and its application and application method. The microalloy reinforcing agent of the present invention has a good strengthening effect on vanadium nitride and ferrovanadium nitride, and can be applied to the needs of different microalloy steel types , the microalloy reinforcing agent can be made into balls with a particle size of 5 to 30 mm with an appropriate amount of vanadium nitride, which is convenient to add into molten steel during the tapping process to improve the effective utilization of microalloy elements; The reinforcing agent is coated with vanadium nitride or ferrovanadium nitride particles and related microalloy elements Nb, Ti, B and other alloys to form a cored wire, and the molten steel is fed in the refining process, which is convenient for some microalloy steel processes and performance targets precise control of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Select vanadium nitride and ferrovanadium nitride alloy reinforcing agent (ie, microalloying reinforcing agent), the composition of which is (all in mass fraction, the same below): N: 37%, Si: 23%, Mn: 17.5% , Al: 5.6%, Cr: 7.3%, C: 0.1%, P: 0.07%, S: 0.06%, the balance is Fe and trace impurities, broken into small particles of 0.01 ~ 4.5mm;

[0041] (2) Choose a bright steel strip, its composition C: 0.07%, Si: 0.09%, Mn: 0.032%, P: 0.018%, S: 0.021%, Al: 0.08%, the balance is Fe, and the thickness is 0.55mm, The above scores are quality scores;

[0042] (3) the small particles obtained by crushing in step (1) and the steel strip in step (2) are coated with a cored wire unit into mm cored wire;

[0043] (4) Select vanadium nitride alloy, its composition is: V: 76%, N: 17%, C: 5.5%, P: 0.04%, S: 0.10%, and its particle size: 5-40mm.

[0044] (5) The micro-alloy reinforcing agent cored wire processed and formed in the step (3) and the vanadium nitride alloy selec...

Embodiment 2

[0059] (1) Select the microalloy reinforcement, the composition of which is (all in mass fraction, the same below): N: 11%, Si: 66%, Mn: 0.1%, Ti: 9.6%, Al: 0.03%, C: 1.9%, P: 0.10%, S: 0.15%, the balance is Fe and trace impurities, particle size 3 ~ 25mm;

[0060] (2) Select nitrogen vanadium alloy, its composition V: 79%, N: 15.5%, C: 4.1%, P: 0.03%, S: 0.07%, particle size 5 ~ 30mm;

[0061] (3) Using the microalloy reinforcing agent selected in step (1) and the vanadium nitride alloy selected in step (2) in the process of deoxidation and alloying of molten steel for converter steelmaking.

[0062] (4) Select a converter with a nominal capacity of 120 tons, and the smelting steel is 20MnSi. The process is as follows: (a) Converter smelting: pre-desulfurization of molten iron, desulfurization of molten iron to below 0.035%, smelting with lime and sintered ore, Regenerate new slag after turning down the furnace once to remove slag. (b) Tapping at the end of the converter (t...

Embodiment 3

[0075] (1) Select the microalloy reinforcement, the composition of which is (all in mass fraction, the same below): N: 26.5%, Si: 43.2%, Mn: 3.8%, Al: 0.4%, C: 0.3%, Ti: 9.5%, P: 0.040%, S: 0.036%, the balance is Fe and trace impurities, broken into small particles of 0.01 ~ 3.5mm;

[0076] (2) Select vanadium nitride alloy, whose composition is V: 77.2%, N: 14%, C: 3.3%, P: 0.04%, S: 0.06%, and the particle size is 0.01-3mm.

[0077] (3) Mix the microalloy reinforcing agent particles selected in step (1) and step (2) together with vanadium nitride particles to make a ball compact, and its composition is: Si: 8.2%, Mn: 0.8%, N : 16.1%, Al: 0.1%, C: 2.3%, Ti: 5.1%, V: 60.1%, P: 0.041%, S: 0.010%, the balance is Fe and a small amount of impurities, and its particle size is 5-45mm.

[0078] (4) The microalloy reinforcing agent and the vanadium nitride spherical block material processed and formed in the step (3) are used in the process of deoxidation and alloying of molten steel...

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Abstract

The invention discloses a micro-alloy reinforcing agent and an application and an application method thereof, and belongs to the field of steel metallurgy functional additives. The micro-alloy reinforcing agent comprises the components: 23-66% of Si, 0.1-17.5% of Mn, 11-37% of N, 0-9.6% of Ti, 0-7.3% of Cr, 0.03-5.6% of Al, 0.1-1.9% of C, not more than 0.1% of P, not more than 0.15% of S, and the balance Fe and impurities; the micro-alloy reinforcing agent has good enhancement effect especially on vanadium nitride and ferrovanadium nitride, can be suitable for the needs of different micro-alloy steel types, and can be made into ball blocks with the particle size of 5-45 mm with vanadium nitride, is conveniently added into molten steel in the tapping process, and improves the effective utilization rate of micro-alloy elements; a cored wire can be formed by coating the micro-alloy reinforcing agent and vanadium nitride or ferrovanadium nitride particles together, and is fed into molten steel in a refining process, so as to be convenient for accurate control of some micro-alloy steel processes and performance objectives.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy functional additives, and more specifically relates to a microalloy reinforcing agent and its application and application method. Background technique [0002] Microalloyed steel in a broad sense is defined as a steel that has been added with trace alloying elements to significantly change one or more of its properties. The mass fraction of alloying elements added in microalloyed steels is generally less than 0.1%. Some microalloyed steels increase the content of microalloying elements due to the need for performance improvement, but generally it is still lower than 0.25%. Such alloying elements are therefore called trace alloying elements. At present, trace alloying elements widely used include elements Nb, V and Ti belonging to subgroups IVB and VB of the periodic table of elements, element B of main group III, etc. In microalloyed steels, microalloying of vanadium plays an important r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C22C38/02C22C38/04C22C38/14C22C38/18C22C38/06C22C28/00C22C30/00
CPCC21C7/0056C22C28/00C22C30/00C22C38/001C22C38/02C22C38/04C22C38/06C22C38/14C22C38/18
Inventor 陈来祥
Owner 马鞍山市恒兴耐火炉料厂
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