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Method for improving and stabilizing boron yield in smelting boron-containing steel

A technology for stabilizing boron and yield, applied in the field of iron and steel metallurgy, can solve the problems of strict quality requirements and high cost of cored wire, and achieve the effects of low price, easy raw materials and good application prospects

Active Publication Date: 2014-07-30
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the wire feeding method can improve the recovery rate of boron in steel, the quality requirements of the cored wire are relatively strict, and the cost is also relatively high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] To smelt mechanical steel with a boron content of 0.0005% to 0.0030%, a total of 4 cans of boron-containing steel are produced in this pouring time, and the method is used for boron alloying and boron content control.

[0015] After molten steel is deoxidized and refined by converter and LF furnace, there is no need to add metal Ti for nitrogen fixation treatment, T[O]=0.0025%, N≤0.0035%, and (FeO+MnO) in slag=1.2%.

[0016] After refining, the molten steel is transported to the tundish for casting, and a single powder B is selected 4 C (purity: 95.2%) is used as injection powder, powder particle size is 300μm, argon is used as carrier gas, injection gas pressure is 0.35MPa, gas flow rate is 1.5m 3 / h,B 4 The amount of C powder added is 2.8kg, the weight of molten steel is 102t, the boron content of molten steel before injection is 0.0004%, and the boron content after injection is 0.0022%. The boron yield is calculated to be 84.1%, and the boron yield of the remaining ...

Embodiment 2

[0019] To smelt mechanical steel with a boron content of 0.0005% to 0.0030%, a total of 3 cans of boron-containing steel are produced in this pouring time, and the method is used for boron alloying and boron content control.

[0020] After molten steel is deoxidized and refined by converter and LF furnace, there is no need to add metal Ti for nitrogen fixation treatment, T[O]=0.0028%, N≤0.0037%, and (FeO+MnO) in slag=1.38%.

[0021] After refining, the molten steel is transported to the tundish for casting, and a single powder B is selected 4 C (purity: 95.2%) is used as injection powder, powder particle size is 200μm, argon is used as carrier gas, injection gas pressure is 0.38MPa, gas flow rate is 1.7m 3 / h,B 4 The amount of C powder added is 2.5kg, the weight of molten steel is 98t, the boron content of molten steel before injection is 0.0004%, and the boron content after injection is 0.0021%. The boron yield is calculated to be 85.4%, and the boron yield of the remaining ...

Embodiment 3

[0023] To smelt mechanical steel with a boron content of 0.0005% to 0.0030%, a total of 3 cans of boron-containing steel are produced in this pouring time, and the method is used for boron alloying and boron content control.

[0024] After molten steel is deoxidized and refined by converter and LF furnace, there is no need to add metal Ti for nitrogen fixation treatment, T[O]=0.0022%, N≤0.0033%, and (FeO+MnO) in slag=1.42%.

[0025] After refining, the molten steel is transported to the tundish for casting, and a single powder B is selected 4 C (purity: 95.2%) is used as injection powder, powder particle size is 100μm, argon is used as carrier gas, injection gas pressure is 0.40MPa, gas flow rate is 2.0m 3 / h,B 4 The amount of C powder added is 2.5kg, the weight of molten steel is 100t, the boron content of molten steel before injection is 0.0004%, and the boron content after injection is 0.0023%. The boron yield is calculated to be 87.7%, and the boron yield of the remaining...

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Abstract

The invention provides a method for improving and stabilizing a boron yield in smelting boron-containing steel. The method adopts a converter-LF furnace-continuous casting process, and is characterized in that in slag after a LF furnace refining, an amount of FeO and MnO is less than or equal to 1.5%, the amount of T[O] is less than or equal to 0.0030%, and the amount of N is less than or equal to 0.0040%. The continuous casting applies a full protection casting. A boron-containing powder is injected into molten steel through a drilling way of a ladle elongated nozzle using an inert gas Ar as a carrier gas when the molten steel is injected in a tundish. The method is low in production cost and simple in operation process without VD furnace treatment and with no need of adding Ti for nitrogen fixation treatment. The boron-containing steel produced by the method has a boron yield of 70%- 90% and the difference of the boron yield of each batch is less than 0.0003 %, which are far better than those of a conventional smelting method for the boron-containing steel.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a method for increasing and stabilizing the yield of boron when smelting boron-containing steel. Background technique [0002] Among the alloying elements concerned in high-strength low-alloy steels, boron is considered to be a special one. The addition of boron in the range of 0.001% to 0.003% can improve the hardenability on the basis of ensuring the matrix structure, and its hardenability is no less than that of steel containing 0.6% Mn, 0.7% Cr, 0.5% Mo and 1.5% Ni , Therefore, its ability to improve hardenability is hundreds of times or even thousands of times that of the above alloy elements, so only a very small amount of boron can save a lot of precious alloy elements. The effect of general alloying elements on improving hardenability increases with the increase of their content in steel, but boron has an optimal content (range), too much or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/00B22D1/00B22D11/108
Inventor 陈本文王晓峰栗红臧绍双张晓军康伟曹亚丹
Owner ANGANG STEEL CO LTD