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Production method of high-performance microalloyed steel and cored wire for production of high-performance microalloyed steel

A technology of microalloy steel and production method, which is applied in the field of microalloy steel production, can solve the problems of difficult product performance to meet the use demand and high production cost, and achieve the effects of improving mechanical properties and weldability, reducing the amount of addition, and reducing the amount of addition

Active Publication Date: 2017-10-17
MAANSHAN XINGDA METALLURGICAL NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the relatively high production cost of the existing microalloy steel plate, and the performance of the obtained product is difficult to meet the needs of use, and provides a production method of high performance microalloy steel and its cored wire and The manufacturing method of the cored wire

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Three kinds of superfine alloy powders of Al, Ti, and Mn with a particle size of 700-1000 meshes are uniformly mixed in a high-temperature shuttle nitriding kiln, and the temperature is controlled at Calcined at 1350°C for 12 hours to produce nitride alloys such as Al, Ti, Mn, etc., which are tightly wrapped with a low-carbon steel strip with a thickness of 0.34mm to form an alloy cored wire with a diameter of 13mm.

[0041] When producing micro-alloy steel Q345B steel, on the basis of the target smelting composition control of C 0.15%, Si 0.23%, Mn 1.40%, Als 0.027%, and Ti 0.009%, reduce Mn to 0.95%, cancel the amount of Ti in the steel, and convert the furnace End point C ≧ 0.06%, end point temperature ≧ 1670 ℃, after tapping, deoxidation and alloying, feed 2.8m / t steel alloy cored wire in the refining argon blowing station or LF ladle furnace, and the wire feeding speed is controlled at 4m / s, The wire feeding process adopts strong argon blowing and stirring for 5 mi...

Embodiment 2

[0043] Three kinds of superfine alloy powders of Al, Ti, and Mn with a particle size of 700-1000 meshes are uniformly mixed in a high-temperature shuttle nitriding kiln, and the temperature is controlled at Calcined at 1500°C for 8 hours to produce nitride alloys such as Al, Ti, Mn, etc., which are tightly wrapped with a low-carbon steel strip with a thickness of 0.45mm to form an alloy cored wire with a diameter of Ф11mm.

[0044] When producing micro-alloy steel Q345B steel, on the basis of controlling the target smelting composition of C0.17%, Si 0.25%, Mn 1.45%, Als 0.030%, and Ti 0.010%, reduce Mn to 1.0%, cancel the amount of Ti in the steel, and convert the furnace End point C ≧ 0.06%, end point temperature ≧ 1670°C, after tapping, deoxidation and alloying, 3.0m / t steel alloy cored wire is fed in the refining argon blowing station or LF ladle furnace, and the wire feeding speed is controlled at 3m / s. The wire feeding process adopts strong argon blowing and stirring for ...

Embodiment 3

[0046] Three kinds of superfine alloy powders of Al, Ti, and Mn with a particle size of 700-1000 meshes are uniformly mixed in a high-temperature shuttle nitriding kiln, and the temperature is controlled at Calcined at 1400°C for 10 hours to make nitride alloys such as Al, Ti, Mn, etc., which are tightly wrapped with a low-carbon steel strip with a thickness of 0.40mm to form an alloy cored wire with a diameter of Ф9mm.

[0047] When producing micro-alloy steel Q345B steel, on the basis of the target smelting composition control of C 0.13%, Si 0.20%, Mn 1.40%, Als 0.025%, and Ti 0.008%, reduce Mn to 0.97%, cancel the amount of Ti in the steel, and the end of the converter C≧0.06%, end point temperature≧1670℃, after tapping, deoxidation and alloying, feed 2.5m / t steel alloy cored wire in the refining argon blowing station or LF ladle furnace, the wire feeding speed is controlled at 4m / s, feed The line process adopts strong argon blowing and stirring for 6 minutes, and weak argo...

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Abstract

The invention discloses a production method of high-performance microalloyed steel and a cored wire for production of the high-performance microalloyed steel, and belongs to the technical field of microalloyed steel production. The production method of the high-performance microalloyed steel comprises the processes of converter steelmaking, refining and rolling, after converter steelmaking and steel tapping deoxidation alloying are conducted, 2.5-3.5 m / t steel is fed into the alloy cored wire in a refining argon blowing station or an LF steel ladle furnace according to different kinds of steel, an inner core of the alloy cored wire comprises Al, Ti and Mn nitride alloy powder, the wire feeding velocity is controlled to be 3-4 m / s, strong argon stirring is conducted for 5-7 min in the wire feeding process, after wire feeding is completed, weak argon stirring is conducted for 1-2 min, the content of [N] in molten steel is controlled to be 80-90 PPm after the steel is fed into the cored wire, temperature measurement and sampling are carried out, and then molten steel is taken to the furnace stage and casting is conducted; and the heating temperature of a steel blank obtained through casting in a heating furnace is 1200-1250 DEG C, the rolling starting temperature is controlled to be 1040-1080 DEG C, and the temperature of precision rolling and finish rolling is controlled to be 830-860 DEG C. By adopting the technical scheme, the using performance of a microalloyed steel plate can be effectively improved, the production cost of the microalloyed steel plate is reduced, and the wide popularizing value is achieved.

Description

technical field [0001] The invention belongs to the technical field of micro-alloy steel production, more specifically, relates to a production method of high-performance micro-alloy steel and a cored wire for production thereof, and has broad application in the production fields of micro-alloy steel, non-quenched and tempered steel and other plate materials Application prospect. Background technique [0002] Trace elements such as V, Nb, Al, Ti, etc., which have grain refinement and precipitation strengthening effects, are usually added in the production process of existing microalloy steels, so that the steel can obtain high strength, high weldability and good formability after hot rolling. But its disadvantage is that the trace elements V, Nb, Al, Ti, etc. added to the steel are expensive, resulting in high production costs. At the same time, Al and Ti are active elements, which are easy to react with oxygen in the steel to form high melting point oxidation. Inclusions a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C21C7/068C22C33/04
CPCC21C7/0056C21C7/068C22C33/04
Inventor 李国安王建国李寿全
Owner MAANSHAN XINGDA METALLURGICAL NEW MATERIAL
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