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Smelting method for stably increasing content of boron in boron-containing steel

A smelting method and technology for boron content, applied in the field of iron and steel metallurgy, can solve the problems of unstable content, low boron recovery rate, affecting boron recovery rate, etc. Effect

Active Publication Date: 2014-01-29
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) The content of [O] and [N] in steel directly affects the recovery rate of boron, oxygen causes the oxidation of [B], and [N] is easy to generate boron nitride, which reduces the use effect of boron
[0004] (2) If the content of [O] and [N] in steel is high, the recovery rate of boron will be low, and the reaction product of boron will be unfavorable to the performance of steel
[0005] (3) The content of [O] and [N] in the steel is unstable, which directly leads to the unstable recovery of boron
[0007] (5) It is difficult to achieve uniform distribution of boron in steel in a short time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Taking LF refining 10B21 high-strength cold heading steel as an example, it includes the following procedures and steps:

[0029] A. Molten steel adopts 50 tons of LD converter top-bottom compound blowing, when the amount of molten steel in the tapping ladle reaches 10.5t, add high-carbon ferromanganese 10.8kg / t to the ladle 钢 , high carbon ferrochrome 2.8kg / t 钢 , core aluminum 2.5kg / t 钢 Carry out deoxidation alloying, the alloy addition sequence is: high-carbon ferromanganese→high-carbon ferrochromium→iron core aluminum, the tapping process adopts slag washing and the whole bottom argon blowing process, and 4.0kg / t of lime is added to the bottom of the ladle before tapping 钢 , Refining slag 1.2kg / t 钢 , Argon gas flow control is 26 ~ 28NL / min;

[0030] B. The molten steel is hoisted to the argon station, and the oxygen activity is 35×10 after the oxygen is fixed. -6 (The mass ratio of oxygen to molten steel, the same below), adding 0.60kg / t of aluminum and iron 钢 ,...

Embodiment 2

[0036] Taking LF refining 10B21 high-strength cold heading steel as an example, it includes the following procedures and steps:

[0037] A. Molten steel adopts 50 tons of LD converter top-bottom composite blowing. When the amount of molten steel in the tapping ladle reaches 11 tons, add high-carbon ferromanganese, high-carbon ferrochrome, and iron core aluminum to the ladle for deoxidation and alloying. The deoxidation and alloying sequence is as follows: : High-carbon ferromanganese → high-carbon ferrochromium → iron core aluminum, the addition amount is controlled as follows: high-carbon ferromanganese 10.0kg / t 钢 , high carbon ferrochrome 3.1kg / t 钢 , core aluminum 2.0kg / t 钢 ;The tapping process adopts slag washing and full bottom argon blowing process, adding lime 4kg / t to the bottom of the ladle before tapping 钢 , Refining slag 1.20kg / t 钢 , Argon gas flow control is 30NL / min;

[0038] B. The molten steel is hoisted to the argon station, and the oxygen activity is 30×10 ...

Embodiment 3

[0044] Taking LF refining 10B21 high-strength cold heading steel as an example, it includes the following procedures and steps:

[0045] A. Molten steel adopts 50 tons of LD converter top-bottom combined blowing. When the amount of molten steel in the tapping ladle reaches 10.5t, add high-carbon ferromanganese, high-carbon ferrochrome, and iron core aluminum to the ladle for deoxidation alloying. The deoxidation alloying sequence It is: high carbon ferromanganese → high carbon ferrochrome → core aluminum, the amount of addition is controlled as: high carbon ferromanganese 9.8kg / t 钢 , high carbon ferrochrome 2.3kg / t 钢 , core aluminum 1.6kg / t 钢 ; The tapping process adopts slag washing and full bottom argon blowing process, adding lime 4 kg / t to the bottom of the ladle before tapping 钢 , Refining slag 1.20kg / t 钢 , Argon gas flow control is 26NL / min;

[0046] B. The molten steel is hoisted to the argon station, and the oxygen activity is 35×10 after the oxygen is fixed. -6 ,...

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Abstract

The invention relates to a smelting method for stably increasing the content of boron in boron-containing steel. The smelting method is characterized in that high-carbon ferromanganese, high-carbon ferrochromium and iron-core aluminum are subjected to the deoxidation alloying in the steel tapping process of a converter, and a whole-course bottom argon blowing and wash heat technology is adopted for reducing oxygen content and nitrogen content in the steel; after steel tapping is completed, molten steel is lifted to an argon station, and the molten steel is converted to an LF (Ladle Furnace) after ferroaluminium is added for adjusting the activity of oxygen in the steel to a required control range; and submerged arc operation, soft argon blowing control, a deep deoxidation technology and a titanium alloy technology are adopted for refining in the LF, then boron alloying is carried out, and later the long-time soft argon blowing is carried out, thus the recovery rate of boron in the steel reaches 82%-86%, the problems of low and instable recovery rate of boron are solved, the fluctuation quantity between the furnaces is less than 0.0005%, the ideal control level is achieved, the dependence of boron alloying on vacuum refining is eliminated, and the requirement of subsequent process for the quality of the boron-containing steel is ensured.

Description

technical field [0001] The invention relates to a process method for improving and stabilizing the boron recovery rate of boron-containing steel during the LF furnace refining process of boron-containing cold heading steel, belonging to the field of iron and steel metallurgy. Background technique [0002] With the user's increasing requirements for steel quality and performance, some steel types require good hardenability. Boron is an element that improves the hardenability of steel. In addition, adding boron in an appropriate amount can improve the low-temperature impact performance of steel and reduce the yield strength. Therefore, boron is widely used in steelmaking production. However, due to the very active chemical properties of boron, it is very easy to oxidize. Improper processes and methods can easily lead to unstable recovery of boron, large differences in boron content between furnaces of the same boron-containing steel, and relatively high requirements for boron ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/072C21C7/06
Inventor 张卫强常跃昌杨春雷章祝雄李金柱张继斌陈伟杨锦文岳伟朱锡森
Owner WUKUN STEEL
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