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Production method of bainite steel with excellent low-temperature impact toughness

A low-temperature impact toughness, bainite steel technology, applied in the direction of improving process efficiency, manufacturing converters, etc., can solve problems such as rail cracks

Pending Publication Date: 2021-12-10
河北敬业中厚板有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The key to purity control is the control of hydrogen, total oxygen, aluminum and non-metallic inclusions in steel. Aluminum deoxidation is often used in the smelting process of conventional steel, but because aluminum will form alumina inclusions, it will cause rail damage. crack

Method used

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  • Production method of bainite steel with excellent low-temperature impact toughness
  • Production method of bainite steel with excellent low-temperature impact toughness
  • Production method of bainite steel with excellent low-temperature impact toughness

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0033] A method for producing a bainitic steel rail with excellent low-temperature impact toughness, characterized in that:

[0034] (1) Pretreatment of molten iron by KR method;

[0035] (2) Converter smelting with combined top-bottom blowing, deoxidizer is added during tapping of molten steel in converter smelting, and the amount of deoxidizer added is 1.5-2.0kg / t molten steel;

[0036] (3) LF furnace refining, LF furnace adopts specific refining slag, which is CaO 50-53%, SiO2 20-23%, MgO 5-10%, Al2O3 6-10%, CaF2 6-10%, FeO in mass percentage ≤1.5%;

[0037] (4) VD treatment;

[0038] (5) Billet continuous casting, continuous casting adopts full protection pouring;

[0039] (6) Rolling and heat treatment, the soaking temperature of the continuous casting slab is 1260-1310°C, and the holding time is 1-1.5 hours; the rough rolling start temperature is 1100-1150°C, and the rough rolling end temperature is 960-1000°C, The starting temperature of finish rolling is 940-980°C,...

Embodiment 5-8

[0047] A method for producing a bainitic steel rail with excellent low-temperature impact toughness, characterized in that:

[0048] (1) Pretreatment of molten iron by KR method;

[0049] (2) Converter smelting with top-bottom combined blowing, deoxidizer is added during tapping of molten steel in converter smelting, and deoxidizer contains Si 72-73%, Ca 11-12%, Ba 11-12%, SiC 1- 2%, the balance is Fe+Al+impurity elements, and the amount of deoxidizer added is 1.5-2.0kg / t molten steel;

[0050] (3) LF furnace refining;

[0051] (4) VD treatment;

[0052] (5) Billet continuous casting, continuous casting adopts full protection pouring;

[0053] (6) Rolling and heat treatment, the soaking temperature of the continuous casting slab is 1260-1310°C, and the holding time is 1-1.5 hours; the rough rolling start temperature is 1100-1150°C, and the rough rolling end temperature is 960-1000°C, The starting temperature of finish rolling is 940-980°C, the end temperature of final roll...

Embodiment 9

[0061] A method for producing a bainitic steel rail with excellent low-temperature impact toughness, characterized in that:

[0062] (1) Pretreatment of molten iron by KR method;

[0063] (2) Converter smelting with top-bottom combined blowing, deoxidizer is added during tapping of molten steel in converter smelting, and deoxidizer contains Si 72-73%, Ca 11-12%, Ba 11-12%, SiC 1- 2%, the balance is Fe+Al+impurity elements, and the amount of deoxidizer added is 1.5-2.0kg / t molten steel;

[0064] (3) LF furnace refining, LF furnace adopts specific refining slag, which is CaO 50-53%, SiO2 20-23%, MgO 5-10%, Al2O3 6-10%, CaF2 6-10%, FeO in mass percentage ≤1.5%;

[0065] (4) VD treatment;

[0066] (5) Billet continuous casting, continuous casting adopts full protection pouring;

[0067] (6) Rolling and heat treatment, the soaking temperature of the continuous casting slab is 1260-1310°C, and the holding time is 1-1.5 hours; the rough rolling start temperature is 1100-1150°C, a...

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Abstract

The invention provides a preparation method of bainite steel which is high in purity, better in hardness, more excellent in wear resistance and corrosion resistance and excellent in low-temperature impact toughness by improving the components and controlling the smelting process, the refining process and the continuous casting process. The method specifically comprises the steps of KR method molten iron pretreatment, top-bottom combined blown converter smelting, LF furnace refining, VD treatment, square billet continuous casting, rolling and heat treatment.

Description

technical field [0001] The invention relates to the field of steel, in particular to a production method of bainitic steel with excellent low-temperature impact toughness. Background technique [0002] The speed of railway transportation is fast and the operating environment is harsh. Therefore, the requirements for steel's crack resistance, wear resistance, corrosion resistance, and low temperature impact toughness are getting higher and higher. [0003] Pearlite is a typical type of rail varieties, but more and more studies have shown that the spacing and strength of pearlite rails have gradually approached the limit value that can be achieved at the industrial level, and when the pearlite structure is used as a rail, its impact toughness Relatively small. Compared with pearlitic steel rails, bainite steel rails also have good contact fatigue resistance under the premise of high strength and high toughness. Bainite rail steel is a rail steel with bainite structure obtain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/35C21C7/06C21C7/076C21D8/00C22C38/02C22C38/42C22C38/46C22C38/58
CPCC21C5/35C21C7/06C21C7/076C21D8/005C22C38/46C22C38/42C22C38/58C22C38/02C22C38/005Y02P10/20
Inventor 李赶坡张觉灵杨海西张素英闫兴丽
Owner 河北敬业中厚板有限公司
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