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Method for smelting boron steel directly from pig iron containing boron

A technology of boron pig iron and boron steel, which is applied in the field of iron and steel smelting, can solve the problems of the uniformity of boron yield distribution and the difficulty of maintaining stable steel properties, and achieve the effects of eliminating cumbersome procedures, stable performance, and uniform distribution

Inactive Publication Date: 2007-01-24
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This smelting method not only requires the pre-preparation of ferroboron and composite ferroboron alloys, but also due to operational reasons, the yield of boron, the uniformity of boron distribution in the steel and the performance of the steel are difficult to keep stable.
And utilize boron-containing pig iron to directly smelt the method of boron steel, there is no report yet

Method used

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  • Method for smelting boron steel directly from pig iron containing boron
  • Method for smelting boron steel directly from pig iron containing boron

Examples

Experimental program
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Effect test

example 1

[0016] Example 1: Take 1000g of boron-containing pig iron produced in a blast furnace, add 15g of calcium carbide-based desulfurizer for desulfurization, and obtain pretreated desulfurized boron-containing pig iron. Take 700g of the above-mentioned desulfurized boron-containing pig iron, its weight % content: B: 0.31, Si: 2.15, C: 3.88, P: 0.06, S: 0.05, Mn: 0.09 and 300g of scrap steel, put it into a corundum crucible, and use a medium frequency induction furnace to heat , When the temperature reaches 1400 ℃, power off, continue to maintain the temperature of the molten pool at 1400 ℃, add 140g of slagging agent, including 120g of CaO, 10g of iron oxide scale, and 10g of MgO. Blow oxygen to the liquid surface of the molten pool, the intensity is 2.5Nl / Kg min, the oxygen blowing time is 20min, stop blowing, add manganese ferroalloy 10g, the Mn content is 75-80%, and the tapping temperature is controlled at 1560°C to obtain boron steel product. Sampling and analysis result wei...

example 2

[0017] Example 2: Take 1000g of boron-containing pig iron produced in a blast furnace, add 13g of CaO and 2g of sodium carbonate for desulfurization, and obtain pretreated boron-containing pig iron. Take 600g of the above-mentioned desulfurized boron-containing pig iron, its weight % content: B: 0.45, Si: 2.52, C: 3.53, P: 0.06, S: 0.05, Mn: 0.10 and scrap steel 400g, put it into a corundum crucible, and use a medium frequency induction furnace to heat , When the temperature reaches 1400°C, the power is cut off, and the temperature of the molten pool is maintained at 1400°C, and 150g of slagging agent is added, including 130g of CaO and 20g of iron oxide scale. Then blow oxygen into the molten pool, the intensity is 3.0Nl / Kg·min, the oxygen blowing time is 23min, stop blowing. Finally, 10 g of ferromanganese alloy is added, the Mn content is 75-80%, and the tapping temperature is controlled at 1570° C. to obtain boron steel products. Sampling analysis results weight % content...

example 3

[0018] Example 3: Take 1000g of boron-containing pig iron produced in a blast furnace, add CaO2g and 13g of calcium carbide desulfurizer for desulfurization, and obtain pretreated boron-containing pig iron. Take 500g of the above-mentioned desulfurized boron-containing pig iron, whose weight % content is: B: 0.59, Si: 2.70, C: 3.10, P: 0.06, S: 0.05, Mn: 0.12, 400g of scrap steel and 100g of iron concentrate, and put them into the corundum crucible , using medium frequency induction furnace heating, when the temperature reaches 1400 ℃, cut off the power, and maintain the temperature of the molten pool at 1400 ℃, add 150g of slagging agent, including 130g of CaO, 20g of iron oxide scale. Then blow oxygen to the molten pool, its strength is 3.5Nl / Kg·min, the oxygen blowing time is 25min, stop blowing. Finally, 10 g of ferromanganese alloy containing Mn75-80% is added, and the tapping temperature is controlled at 1580° C. to obtain boron steel products. Sampling and analysis res...

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Abstract

This invention relates to prodn. of boron steel by using boron pig iron as raw material. The boron-contg. pig iron, produced from blast-furnace from boron iron ore, is used as raw material, proceeding sulphur-removing by using calcium carbonate, lime or calcium carbide or their composition as sulphur-removing agent, then feeding in a convertor. The prodn. procedure are as follows: (1). charging the above-said molten iron of 50-70% wt. parts and the rest being waste steel or iron ore, (2). adding slag-formation agent contg. CaO and small amount of iron scale and MgO at temp. of 1400 deg.C and maintanied at 1400 deg.C, (3). feeding-in oxygen for 20-25 min, with the feeding rate of 2.5-3.5 NM3 / t.min and (4). finishing point control; steel-tapping temp. is 1550-1580 deg.C, and adding manganese iron alloy or silicon manganese alloy, to make the content of manganese being not less than 0.6% and the content of boron being of 0.001-0.006% (wt). Advantages are: even distribution of boron, stable steel properties.

Description

technical field [0001] The invention relates to a steel smelting method, in particular to a method for directly smelting boron steel with boron-containing pig iron. Background technique [0002] Boron can improve the hardenability of steel. The traditional boron steel smelting method was first invented and used in production in the United States in 1937. It is mainly the method of blast furnace smelting molten iron, molten iron steelmaking, and adding boron alloy in the later stage of steelmaking. Since boron has a strong binding force with oxygen and nitrogen, it is easy to form boron oxides and nitrides and lose its effect. In order to protect boron, it is necessary to add aluminum to fully deoxidize, and to add titanium, zirconium, etc. to fully fix nitrogen. There are two ways to add boron in the traditional smelting method: one is to add boron, aluminum, titanium, etc. separately, that is, first add aluminum to deoxidize, then add titanium to fix nitrogen, and finally ...

Claims

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Application Information

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IPC IPC(8): C22C33/04C21C5/28
Inventor 刘素兰杨中东薛向欣樊占国李刚
Owner NORTHEASTERN UNIV
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