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Microalloying Method for Improving the Properties of High Energy Input Welding Steel

A high-energy welding and micro-alloying technology, applied in the field of low-alloy steel manufacturing, can solve the problems of insufficient effect of promoting the formation of intragranular acicular ferrite, restricting the refinement of the structure of the heat-affected zone, etc., so as to achieve low production costs. , The effect of improving strength and toughness and refining grains

Inactive Publication Date: 2018-10-09
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above studies are not sufficient in controlling the pinning of inclusion particles to the austenite grain boundary and promoting the formation of intragranular acicular ferrite, and they do not involve the degree of dispersion and adsorption of some inclusion particles to other inclusion particles. influence, which to a large extent restricts the refinement of the heat-affected zone

Method used

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  • Microalloying Method for Improving the Properties of High Energy Input Welding Steel
  • Microalloying Method for Improving the Properties of High Energy Input Welding Steel
  • Microalloying Method for Improving the Properties of High Energy Input Welding Steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A kind of Mo-Nb-Mg-Ti microalloying method that improves the performance of steel for high heat input welding, specifically as follows:

[0041] The process of smelting high-energy-input welding steel is 120t top-bottom combined blowing converter-120tLF ladle furnace refining-continuous casting.

[0042] Conditions of molten iron: molten iron [P]≤0.090%, [S]≤0.045%.

[0043] Converter: end target [C]=0.04~0.06%, [P]≤0.015%, [S]≤0.030%, [O]=500~800ppm, tapping temperature 1685℃, adding ferromolybdenum and manganese during tapping Iron, ferrosilicon, ferroniobium, ferroaluminum.

[0044] LF: The refining time is 40 minutes, and the net blowing time of argon after calcium treatment is 8 minutes. During the net blowing, the liquid surface of molten steel should not be exposed. The temperature of molten steel entering the station is 1585°C for the first furnace and 1580°C for the continuous pouring furnace. After entering the station, the feeding amount of the aluminum wi...

Embodiment 2

[0048] A kind of Mo-Nb-Mg-Ti microalloying method that improves the performance of steel for high heat input welding, specifically as follows:

[0049] The process of smelting high-energy-input welding steel is 120t top-bottom combined blowing converter-120tLF ladle furnace refining-continuous casting.

[0050] Conditions of molten iron: molten iron [P]≤0.090%, [S]≤0.045%.

[0051] Converter: end target [C]=0.04~0.06%, [P]≤0.015%, [S]≤0.030%, [O]=500~800ppm, tapping temperature 1680℃, adding ferromolybdenum and manganese during tapping Iron, ferrosilicon, ferroniobium, ferroaluminum.

[0052] LF: The refining time is 45 minutes, and the net blowing time of argon after calcium treatment is 10 minutes. During the net blowing, the liquid surface of molten steel should not be exposed. The temperature of molten steel entering the station is 1580°C for the first furnace and 1575°C for the continuous pouring furnace. After entering the station, the feeding amount of the aluminum w...

Embodiment 3

[0056] A kind of Mo-Nb-Mg-Ti microalloying method that improves the performance of steel for high heat input welding, specifically as follows:

[0057] The process of smelting high-energy-input welding steel is 120t top-bottom combined blowing converter-120tLF ladle furnace refining-continuous casting.

[0058] Conditions of molten iron: molten iron [P]≤0.090%, [S]≤0.045%.

[0059] Converter: end target [C]=0.04~0.06%, [P]≤0.015%, [S]≤0.030%, [O]=500~800ppm, tapping temperature 1670℃, adding ferromolybdenum and manganese during tapping Iron, ferrosilicon, ferroniobium, ferroaluminum.

[0060] LF: The refining time is 42 minutes, and the net blowing time of argon after calcium treatment is 6 minutes. During the net blowing, the liquid surface of molten steel should not be exposed. The temperature of molten steel entering the station is 1590°C for the first furnace and 1585°C for the continuous pouring furnace. After entering the station, the feeding amount of the aluminum wi...

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Abstract

The invention discloses a microalloying method capable of improving performance of steel for large heat input welding. The specific flow process of the production method comprises a converter steelmaking process, an LF refining process and a continuous casting process; according to the kind and the adding sequence of a deoxidizing agent in the LF refining process, Mo, Mn, Si, Nb, Al, Ca, Mg and Ti are included; the Al is adopted for final deoxidation, Mo-Nb-Mg-Ti alloying is carried out, the dispersive action of the MgO on Al2O3 and Ti2O3 serves as the foundation, dispersed, rich and small refractory oxides are formed to serve as cores, and generation of acicular ferrite in austenitic crystalline grains is promoted; on the other hand, a certain amount of Mo and Nb improve toughness of the steel while the grains are refined, and forming of pro-eutectoid ferrite of the grain boundary is restrained; in addition, part of small inclusion particles and carbon nitrogen carry out pinning on the austenite grain boundary, through several-aspect joint action, heat affected zone grains are fully refined, and the toughness of the steel is obviously improved; and the method is simple in control and low in production cost, and the steel for large heat input welding can be subject to large-scale production in an industrialization manner.

Description

technical field [0001] The invention belongs to the technical field of low-alloy steel manufacturing, and in particular relates to a micro-alloying method for improving the performance of high-energy-input welding steel. Background technique [0002] Steel plates are widely used in infrastructure and large structures such as buildings, bridges, pressure vessels, storage tanks, pipelines and ships. The development trend of large-scale and high-rise building components requires that the thickness of the steel plate be increased, and at the same time have higher comprehensive properties, including higher mechanical properties, efficient processing properties, and excellent corrosion resistance and fatigue damage resistance. [0003] However, as the strength of the steel plate increases, its impact toughness and weldability decrease significantly, and the susceptibility to weld cracks increases. In order to improve the welding efficiency of engineering structures, large input e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06C22C33/06C22C38/04C22C38/02C22C38/06C22C38/12C22C38/14
CPCC21C7/0006C21C7/06C22C33/06C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 朱立光王硕明张彩军韩毅华刘增勋孙立根张庆军王雁周景一
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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