A kind of liquid magnesium treatment process for ship plate steel

A treatment process and technology for ship plate steel, applied in the field of liquid magnesium treatment process of ship plate steel, can solve the problems of industrialized technology integration and application that have not been reported, and achieve improved stability, improved working environment, and improved mechanical properties. Effect

Active Publication Date: 2019-04-26
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in China, the research on molten steel magnesium treatment technology is mostly concentrated in the basic theory and laboratory research stage, and the integration and application of industrial technology have not been reported yet.

Method used

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  • A kind of liquid magnesium treatment process for ship plate steel
  • A kind of liquid magnesium treatment process for ship plate steel
  • A kind of liquid magnesium treatment process for ship plate steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A kind of molten magnesium treatment process of ship plate steel, as follows:

[0032] First, determine the location and timing of magnesium treatment:

[0033]The steel type relied on in this example is Q345B steel, the smelting process route adopted by this steel type is BOF-LF-CC, and the industrial production of two heats has been carried out; the nominal capacity of the converter is 150 tons, and the Mg-Al-Fe alloy The wire feeding operation of the cored wire is carried out after the fine-tuning of the LF alloy is completed; the composition and mass percentage of the Mg-Al-Fe alloy are: Mg: 5.32%, Al: 52.61%, Fe: 41.70%, and the balance is carbon silicon manganese Impurities such as phosphorus and sulfur; Mg-Al-Fe alloy cored wire parameters are: diameter Φ13mm, iron sheet thickness 0.42mm, core powder particle size 0.01-3mm, core powder filling rate 0.25kg / m;

[0034] BOF-LF-CC route magnesium treatment process such as figure 1 shown;

[0035] Secondly, determi...

Embodiment 2

[0045] A kind of molten magnesium treatment process of ship plate steel, as follows:

[0046] First, determine the location and timing of magnesium treatment:

[0047] The steel type used in this example is AH32 steel, the smelting process route adopted by this steel type is BOF-LF-RH-CC, industrial production of two heats has been carried out, the nominal capacity of the converter is 150 tons, Mg-Al- Fe alloy cored wire operations are all carried out after RH vacuum treatment; the composition and mass percentage of Mg-Al-Fe alloy are: 10.18% Mg, 54.87% Al, 34.71% Fe, and the balance is carbon, silicon, manganese, phosphorus, sulfur and other impurities ;The parameters of Mg-Al-Fe alloy cored wire are: diameter Φ13mm, iron sheet thickness 0.42mm, core powder particle size 0.01-3mm, core powder filling rate 0.25kg / m;

[0048] BOF-LF-RH-CC route magnesium treatment process such as figure 2 shown;

[0049] Secondly, determine the amount of aluminum and magnesium treatment fee...

Embodiment 3

[0059] A kind of molten magnesium treatment process of ship plate steel, as follows:

[0060] First, determine the location and timing of magnesium treatment:

[0061] The steel type used in this example is DH36 steel, the smelting process route adopted by this steel type is BOF-LF-RH-CC, industrial production of 5 heats has been carried out, the nominal capacity of the converter is 150 tons, and the magnesium treatment feeding line The operations are all carried out after RH vacuum treatment; the composition and mass percentage of the Mg-Al-Fe alloy are: Mg: 8.24%, Al: 56.47%, Fe: 35.23%, and the balance is impurities such as carbon, silicon, manganese, phosphorus, and sulfur; Mg -Al-Fe alloy cored wire parameters are: diameter Φ13mm, iron sheet thickness 0.42mm, core powder particle size 0.01~3mm, core powder filling rate 0.24kg / m;

[0062] BOF-LF-RH-CC route magnesium treatment process such as figure 2 shown;

[0063] Secondly, determine the amount of aluminum and magne...

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Abstract

The invention discloses a liquid steel magnesium treatment process for ship plate steel and belongs to the field of clean steel smelting. The process comprises the following steps that firstly, the station and time for magnesium treatment are determined, wherein Mg-Al-Fe alloy core-spun yarn is added after an LF procedure alloy is slightly adjusted or after RH procedure vacuum treatment is carried out; secondly, according to the content of acid dissolved aluminum in steel, on the premise of guaranteeing the magnesium treatment effect of the Mg-Al-Fe alloy core-spun yarn, the aluminum feeding amount and the magnesium treatment wire feeding amount are coordinately configured; and next, magnesium treatment is carried out, wherein in the LF or RH procedure, a core-spun yarn feeding method is adopted to add the Mg-Al-Fe alloy core-spun yarn into liquid steel of the ship plate steel, and finally, the finished product liquid steel is obtained. The liquid steel magnesium treatment process for the ship plate aluminum deoxidizing steel is applied to the ship plate steel refining process, and the cleanliness of the ship plate steel and the ingredients, number, particle size and distribution of inclusions in the steel can be controlled; and by means of the method, the cleanliness of the ship plate steel and the control level of nonmetallic inclusions are improved, and therefore the mechanical performance and the stability of the ship plate steel are improved.

Description

technical field [0001] The invention belongs to the field of clean steel smelting, and in particular relates to a process for treating molten magnesium for ship plate steel. Background technique [0002] Ship plate steel is mainly used to manufacture hulls and decks of oceangoing, coastal and inland waterway ships. Ship steel not only needs to withstand chemical / electrochemical / biological corrosion during service, but also bears the alternating load caused by wind and wave impact. In addition, the ship processing and forming process is complex, which requires ship plate steel to have good toughness, strength, and durability. Corrosion performance, welding performance, processing and forming performance. In China, with the development of social economy, the demand for ship plate steel continues to increase. After 2003, the production of ship plate steel entered a stage of rapid development. By 2010, the output of ship plate steel reached 20.5 million tons, and thereafter Af...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06C21C7/04
CPCC21C7/0006C21C7/0056C21C7/04C21C7/06
Inventor 闵义刘承军王博姜茂发吕铭
Owner NORTHEASTERN UNIV LIAONING
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