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Smelting method of mo-nb-ti-mg steel to improve weldability

A mo-nb-ti-mg, welding performance technology, applied in the field of low-alloy steel manufacturing, can solve problems such as the inability to suppress the growth of austenite grains well, the reduction of the toughness of the heat-affected zone of the steel plate, and the insufficient effect. , to achieve the effect of low production cost, improved toughness and simple control

Inactive Publication Date: 2018-07-31
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent ZL 200710052135.2 "A large input energy welded high-strength marine steel plate and its manufacturing method" uses Ti 2 o 3 、A1 2 o 3 The particles pin the austenite grain boundary, and the particles exist stably at high temperature in the welding heat cycle zone, but the diameter of these particles is relatively large, which cannot well inhibit the growth of austenite grains
[0007] 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. To a certain extent, it will also promote the formation of pro-eutectoid ferrite at the austenite grain boundary, and the pro-eutectoid ferrite at the austenite grain boundary will also greatly reduce the toughness of the heat-affected zone of the steel plate

Method used

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  • Smelting method of mo-nb-ti-mg steel to improve weldability
  • Smelting method of mo-nb-ti-mg steel to improve weldability
  • Smelting method of mo-nb-ti-mg steel to improve weldability

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A kind of Mo-Nb-Ti-Mg steel smelting method that improves weldability, specifically as follows:

[0042] The process of smelting high-energy-input welding steel is 120t top-bottom combined blowing converter-120tLF ladle furnace refining-continuous casting.

[0043] Conditions of molten iron: molten iron [P]≤0.090%, [S]≤0.045%.

[0044] 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.

[0045] 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 wire is 2.0m / t steel, lime and fluorite ar...

Embodiment 2

[0049] A kind of Mo-Nb-Ti-Mg steel smelting method that improves weldability, specifically as follows:

[0050] The process of smelting high-energy-input welding steel is 120t top-bottom combined blowing converter-120tLF ladle furnace refining-continuous casting.

[0051] Conditions of molten iron: molten iron [P]≤0.090%, [S]≤0.045%.

[0052] 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.

[0053] 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 wire is 1.5m / t steel, and lime and fluori...

Embodiment 3

[0057] A kind of Mo-Nb-Ti-Mg steel smelting method that improves weldability, specifically as follows:

[0058] The process of smelting high-energy-input welding steel is 120t top-bottom combined blowing converter-120tLF ladle furnace refining-continuous casting.

[0059] Conditions of molten iron: molten iron [P]≤0.090%, [S]≤0.045%.

[0060] 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.

[0061] 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 wire is 1.9m / t steel, lime and fluorite ar...

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Abstract

The invention discloses a Mo-Nb-Ti-Mg steel smelting method for improving welding performance. The smelting method comprises the specific flowing processes of converter steelmaking, LF refining and continuous casting working procedures. Mo-Nb-Ti-Mg microalloyed steel chemically comprises, in percentage by mass, 0.06-0.08% of C, 1.25-1.60% of Mn, 0.010% or smaller of S, 0.025% or smaller of P, 0.20-0.40% of Si, 0.010-0.030% of Als, 0.060-0.080% of Mo, 0.010-0.020% of Ti, 0.002-0.005% of Mg, 0.020-0.035% of Nb and the balance of Fe and other unavoidable impurities. According to the Mo-Nb-Ti-Mg steel smelting method, Al final deoxidization is adopted for carrying out Mo-Nb-Ti-Mg microalloying, steel obdurability is obviously improved, control is simple, the production cost is low, and industrial mass production of steel for large heat input welding can be achieved.

Description

technical field [0001] The invention belongs to the technical field of low-alloy steel manufacture, and in particular relates to a Mo-Nb-Ti-Mg steel smelting method for improving welding performance. 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 energy welding technol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C7/00C21C7/06C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
CPCC21C5/28C21C7/0006C21C7/0056C21C7/06C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 朱立光刘增勋李玉谦王硕明张彩军孙立根韩毅华杜琦铭成慧梅许伟贾改风王雁周景一
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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