Compound nitrogen alloy core spun yarn and preparation method thereof

A cored wire and nitrogen alloy technology, which is applied in the field of composite nitrogen alloy cored wire and its preparation to achieve the effects of stable process, improved quenching suitability and reduced cost

Active Publication Date: 2014-08-06
安徽中元新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the technical problems existing in the microalloying of molten steel at present, and provides a composite nitrogen alloy cored wire to change the single element so as to improve the strengthening effect of alloying elements and Optimize the microalloying process to achieve the purpose of stabilizing the performance of the target steel grade and reducing costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: A steel plant has a converter with a nominal capacity of 300 tons and a tapping capacity of 290-310 tons, using the composite nitrogen alloy cored wire of the present invention, and the target steel grade is HRB500E. The inner core material of the cored wire is: vanadium nitride, ferrosilicon nitride, silicon manganese nitride, ferroboron nitride. The mass content of components is N: 28.6%, V: 33.5%, B: 2.8%, Si: 16.9%, Mn: 4.7%, Fe: 12.2%, C: 0.5%, and the remaining components are a small amount of S, P, Ca, Mg Wait. The diameter of the cored wire is φ26. Directly feed the cored wire into the ladle molten steel with a double-channel wire feeding machine, the feeding speed is 120-150m / min, the feeding amount is 2.1-2.8m / ts, and the mass content of the main components of the finished steel is: C: 0.20 ~0.24%, Si: 0.48~0.62%, Mn: 1.33~1.57%, P: 0.022~0.029%, S: 0.017~0.023%, Als: 0.003~0.010%,, V: 0.040~0.069%, N: 0.019 ~0.032%, B: 0.001~0.002%. The main ...

Embodiment 2

[0019] Example 2: A steel plant has a converter with a nominal capacity of 180 tons and a tapping capacity of 170 to 185 tons. The compound nitrogen alloy cored wire of the present invention is used, and the target steel grade is HRB500. The inner core material of the cored wire is: ferrovanadium, ferrosilicon nitride, ferroniobium nitride, ferroboron. The mass content of components is N: 23.5%, V: 27.8%, Nb: 2.9%, B: 2.4%, Si: 27.2%, Al: 0.8%, Fe: 13.7%, C: 0.7%, and the remaining components are a small amount of S, P, Ca, Mg, etc. The diameter of the cored wire is φ16. Directly feed the cored wire into ladle molten steel with a general-purpose wire feeding machine, the wire feeding speed is 100-140m / min, the feeding amount is 2.7-3.2m / ts, the mass content of the main components of the finished steel is: the content is C: 0.21~0.23%, Si: 0.45~0.67%, Mn: 1.30~1.56%, P: 0.023~0.027%, S: 0.016~0.025%, V: 0.035~0.058%, Nb: 0.003~0.005%, B: 0.001 ~0.002%, N: 0.017~0.029%.

...

Embodiment 3

[0022] Example 3: A steel factory has an electric furnace with a nominal capacity of 60 tons and a tapping capacity of 65 to 75 tons. The composite nitrogen alloy cored wire of the present invention is used, and the target steel type is HRB400. The inner core material of the cored wire is: iron vanadium nitride, silicon manganese nitride, titanium iron nitride, niobium iron. The mass content of components is N: 11.9%, V: 26.3%, Nb: 2.5%, Si: 26.8%, Mn: 9.2%, Fe: 13.5%, Ti: 7.7%, Al: 0.6%, C: 0.4%. The remaining components are a small amount of S, P, Ca, Mg, etc. The diameter of the cored wire is φ8. Directly feed the cored wire into ladle molten steel with a general-purpose wire feeding machine, the feeding speed is 80-110m / min, the feeding amount is 3.7-4.0m / ts, and the mass content of the main components of the finished steel is: C: 0.20- 0.23%, Si: 0.46-0.58%, Mn: 1.30-1.52%, P: 0.020-0.027%, S: 0.015-0.020%, V: 0.032-0.051%, N: 0.012-0.017%, Ti: 0.01-0.03 %, Nb: 0.001...

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Abstract

The invention provides compound nitrogen alloy core spun yarn and a preparation method thereof, and belongs to the technical field of molten steel refinement. The core spun yarn comprises inner core materials and a coating layer, wherein the inner core materials are formed by mixing more than three of ferrovanadium, nitrided ferrovanadium, vanadium nitride, ferro-silicon nitride, silicomanganese nitride, ferrotitanium nitride, ferroboron, ferroboron nitride, ferrocolumbium and ferrocolumbium nitride, the inner core materials at least comprise more than two nitrides or nitralloy, and the coating layer adopts a bright steel belt. The preparation method of the core spun yarn comprises the steps as follows: the inner core materials are prepared firstly; materials are prepared according to required nitrogen content, alloy elements and types of targeted steel; the inner core materials are prepared through powder grinding, uniform mixing and granulating; and the inner core materials are coated with the bright steel belt to form the round core spun yarn. The core spun yarn provided by the invention can improve the strengthening effect of the alloy elements and optimize the microalloying technology, and purposes of stabilizing the target steel performance and reducing the cost are achieved.

Description

technical field [0001] The invention belongs to the technical field of molten steel refining, and in particular relates to a composite nitrogen alloy cored wire and a preparation method thereof. Background technique [0002] The metallurgical industry produces high-strength anti-seismic steel, wear-resistant and corrosion-resistant steel, often through micro-alloying technology, and the common elements of micro-alloying are: V, Nb, Ti, B, Si, Mn, N. The different contents, compositions and microalloying methods of these elements all have different effects on the relevant properties of the target steel. At present, the main technical problems of microalloying are: single alloying elements, insufficient microalloying strengthening effect, poor controllability of process state, unstable performance of target steel grade, and high comprehensive cost. Contents of the invention [0003] Aiming at the technical problems existing in the current microalloying of molten steel, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00
Inventor 陈来祥
Owner 安徽中元新材料技术有限公司
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