Production method of microalloyed steel for high heat input welding

A high-energy-input welding and micro-alloy steel technology, which is applied in the field of micro-alloy steel production, can solve the problems that the low-temperature impact performance of the steel plate and the welding fusion line is difficult to meet the use requirements and high production costs, so as to ensure the high-energy-input welding performance, Improved low temperature impact performance and significant economic benefits

Inactive Publication Date: 2017-09-19
MAANSHAN XINGDA METALLURGICAL NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the relatively high production cost of existing microalloy steels for ship plates and offshore platforms, and the low-temperature impact performance of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A production method of microalloy steel for high heat input welding in this embodiment includes converter steelmaking, LF ladle furnace refining and rolling processes. Metal Mg is extruded into Ф4mm metal magnesium wire, the outer layer is covered with a metal aluminum strip with a thickness of 0.5mm, and then tightly covered with a low-carbon steel strip with a thickness of 0.45mm to form an AlMg alloy cored wire with a diameter of Ф9mm. In the alloy cored wire, Al accounts for 60% and Mg accounts for 40% by weight. When adopting the method of this embodiment to produce E36 ship plate steel, control C 0.13%, Si 0.3%, Mn 1.60%, Als 0.020%, Ti 0.01%, V 0.05%, Nb 0.05%, Ni 0.035% basis First, reduce V, Nb, and Ni to 0.030%, 0.035%, and 0.025%, respectively, cancel the amount of Ti in the steel, control the end point C of the converter ≧0.06%, and the end point temperature ≧1670°C, and strictly control the oxidizing properties of the converter slag and molten steel. , con...

Embodiment 2

[0033] A production method of microalloy steel for high heat input welding in this embodiment includes converter steelmaking, LF ladle furnace refining and rolling processes. Metal Mg is extruded into Ф6mm metal magnesium wire, and the outer layer is covered with a layer of 1mm metal aluminum strip, and then tightly covered with a 0.34mm thick low-carbon steel strip to form an AlMg alloy cored wire with a diameter of Ф13mm. In the wire, Al accounts for 80% and Mg accounts for 20% by weight. When adopting the method of this embodiment to produce E36 ship plate steel, control C0.14%, Si 0.4%, Mn 1.40%, Als 0.050%, Ti 0.020%, V 0.06%, Nb 0.035%, Ni0.028 in the target smelting composition control %, reduce V, Nb, and Ni to 0.04%, 0.020%, and 0.018%, respectively, cancel the amount of Ti in the steel, control the end point C of the converter ≧0.06%, and the end point temperature ≧1670°C, and strictly control the slag and molten steel of the converter Oxidation, the molten steel [O...

Embodiment 3

[0035] A production method of microalloy steel for high heat input welding in this embodiment includes converter steelmaking, LF ladle furnace refining and rolling processes. Metal Mg is extruded into Ф5mm metal magnesium wire, and the outer layer is covered with a layer of 0.7mm metal aluminum strip, and then tightly covered with a 0.4mm thick low-carbon steel strip to form an AlMg alloy cored wire with a diameter of Ф11mm. In the core wire, Al accounts for 72% and Mg accounts for 28% by weight. When adopting the method of this embodiment to produce E36 ship plate steel, control C 0.12%, Si 0.20%, Mn 1.50%, Als 0.040%, Ti 0.010%, V 0.05%, Nb 0.04%, Ni0.032% in the target smelting composition On the basis, reduce V, Nb, and Ni to 0.035%, 0.030%, and 0.020%, respectively, cancel the amount of Ti in the steel, control the end point C of the converter ≧0.06%, and the end point temperature ≧1670°C, and strictly control the oxidation of converter slag and molten steel Control the ...

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Abstract

The invention discloses a production method of microalloyed steel for high heat input welding and belongs to the technical field of production of microalloyed steel. The production method of the microalloyed steel for high heat input welding comprises the steps of converter steelmaking, and ladle furnace (LF) or VD furnace refining and rolling, specifically, before molten steel is discharged after LF or VD furnace refining, oxygen is confirmed, the O in the molten steel is controlled to be 20-45 PPm, then AlMg alloy core-spun wires are injected, the wire injection value is controlled to be 0.10-1.65 m/t, the wire injection speed is controlled to be 2.5-3 m/s, argon stirring is conducted for 5-7 minutes in the wire injection process, and argon weak stirring is conducted for 1-2 minutes after the wires are injected. By adoption of the method, the low-temperature impact performance of a steel plate and a welding fusion line part can be effectively improved and enhanced, the content of precious alloy such as Ni, Nb and V in the microalloyed steel can be reduced, the production cost of the microalloyed steel can be reduced by 10-30 yuan per ton, and the economic benefits are remarkable.

Description

technical field [0001] The invention belongs to the technical field of microalloy steel production for ship plates, offshore platforms, etc., and more specifically relates to a microalloy steel for large heat input welding and a production method thereof, which can be used in large shipbuilding, offshore oil drilling platforms, etc. Production fields such as line energy welding have broad application prospects. Background technique [0002] Micro-alloy steels for ship plates and offshore platforms usually adopt high-energy-input welding technology, and the low-temperature impact performance of the steel plate and the welding fusion line during high-energy-input welding is crucial to ensure its safe use and service life. In the prior art, in order to improve the low-temperature impact performance of the steel plate and the welding fusion line, V, Nb, Ni, Al, Ti, etc., which can improve the low-temperature impact performance, are usually added in the production process of micr...

Claims

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Application Information

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IPC IPC(8): C21C7/00C21C7/06C22C38/04C22C38/02C22C38/06C22C38/14C22C38/12C22C38/08
CPCC21C7/0056C21C7/0006C21C7/06C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14
Inventor 李国安王建国李寿全
Owner MAANSHAN XINGDA METALLURGICAL NEW MATERIAL
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