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Bainite weathering steel and production method thereof

A production method and bainite technology, applied in the direction of manufacturing converters, etc., can solve the problem of high production cost, and achieve the effects of reducing energy consumption, reducing phase transition temperature, and saving social resources

Active Publication Date: 2021-08-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method adds precious alloys such as Nb and V to the steel, and the production cost is high

Method used

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  • Bainite weathering steel and production method thereof
  • Bainite weathering steel and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] A method for producing bainitic weathering steel, comprising the steps of:

[0045] (1) The temperature is 1280 ℃, and [S] is 0.014% (mass percentage of S in molten iron) qualified molten iron is first subjected to KR desulphurization, and after desulphurization is finished, carry out slag removal treatment, the bright area of ​​molten iron is 95%, and the end point of molten iron is [ S] is 0.0010% (mass percentage of S in molten iron);

[0046] (2) Carry out converter smelting, add pellets and iron oxide scale as coolant; fluorite is added in batches at an amount of 3.0kg per ton of steel, and it is strictly forbidden to add fluorite 2 minutes before the end of blowing, using slag blocking cones and slag blocking plugs Double block slag tapping, the slag thickness is 42mm, and ferrosilicon is used for deoxidation and alloying in converter tapping;

[0047] (3) Refining in RH furnace. After reaching RH, measure and record the [O] content in steel with a fast oxygen-fi...

Embodiment 2

[0061] A method for producing bainitic weathering steel, comprising the steps of:

[0062] (1) The temperature is 1310 ℃, [S] is 0.012% (mass percentage of S in molten iron) qualified molten iron is first carried out KR desulphurization, after desulphurization is finished, carry out slag removal treatment, the bright area of ​​molten iron is 95%, the end point of molten iron [ S] is 0.0010% (mass percentage of S in molten iron);

[0063] (2) Carry out converter smelting, add pellets and iron oxide scale as coolant; fluorite is added in batches at a rate of 3.5kg per ton of steel, and it is strictly forbidden to add fluorite 2 minutes before the blowing end, using slag blocking cones and slag blocking plugs Double-stop slag tapping, slag thickness is 45mm, converter tapping with ferrosilicon for deoxidation and alloying;

[0064] (3) Refining in RH furnace. After arriving at RH, measure and record the [O] content in the steel with a fast oxygen-fixing probe. The clearance of t...

Embodiment 3

[0077] A method for producing bainitic weathering steel, comprising the steps of:

[0078] (1) The temperature is 1265 ℃, [S] is 0.010% (mass percentage of S in molten iron) qualified molten iron is first carried out KR desulphurization, after desulphurization is finished, carry out slag removal treatment, the bright area of ​​molten iron is 95%, the end point of molten iron [ S] is 0.0010% (mass percentage of S in molten iron);

[0079] (2) Carry out converter smelting, add pellets and iron oxide scale as coolant; fluorite is added in batches at a rate of 3.4kg per ton of steel, and it is strictly forbidden to add fluorite 2 minutes before the blowing end, using slag blocking cones and slag blocking plugs Double-stop slag tapping, slag thickness is 46mm, converter tapping with ferrosilicon for deoxidation and alloying;

[0080] (3) Refining in RH furnace. After arriving at RH, measure and record the [O] content in the steel with a fast oxygen-fixing probe. The clearance of t...

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Abstract

The invention discloses bainite weathering steel and a production method thereof. The production method comprises the steps of molten iron pretreatment, converter smelting, RH furnace refining, LF furnace refining, slab continuous casting, casting blank surface scaling after cooling to the room temperature, heating furnace austenitizing, high-pressure water dephosphorization, recrystallization zone controlled rolling, ultra-fast cooling quenching, coiling and medium-temperature relaxation, wherein the cooling rate of the ultra-fast cooling quenching is 15-40 DEG C / s, and the quenching termination temperature is 250-350 DEG C. The bainite weathering steel produced through alloying design has a fine bainite structure, the yield strength is larger than or equal to 800 MPa, the total elongation at fracture is larger than or equal to 20%, the impact energy at the temperature of -20 DEG C is larger than or equal to 100 J, the electrochemical corrosion current density is smaller than or equal to 1.70*10<-5> A / cm<2>, the corrosion rate is smaller than or equal to 3.20*10<-3> mm / y, and the bainite weathering steel has good toughness ratio and weather resistance.

Description

technical field [0001] The invention belongs to the technical field of weather-resistant steel plate manufacturing, and in particular relates to a bainitic weather-resistant steel and a production method thereof. Background technique [0002] Weather-resistant steel is also called atmospheric corrosion-resistant steel. By adding copper, chromium, nickel and other elements to the steel, a dense weather-resistant rust layer is formed. It can resist atmospheric corrosion for a long time without painting. Compared with the cost of stainless steel Greatly reduced, widely used in containers, railway freight cars, high-speed train cars, communication and transmission towers, bridges and heavy-duty vehicle manufacturing and other industries. In recent years, in order to meet the development needs of various industries to enhance weight reduction, energy saving and emission reduction, the research and development of high-strength weathering steel has attracted much attention, especia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/06C22C38/58C22C38/50C22C38/02C21C5/30C21C7/10C21D8/02C21D1/18
CPCC22C33/06C22C38/58C22C38/50C22C38/02C21C5/30C21C7/10C21D8/0205C21D8/0226C21D8/0247C21D1/18
Inventor 彭政务李烈军李炯轶温志林陈松军高吉祥
Owner SOUTH CHINA UNIV OF TECH