A kind of smelting method of low carbon and low silicon welding wire steel

A low-carbon, low-silicon, welding wire steel technology, applied in the direction of manufacturing converters, etc., can solve the problems of more bubbles in the casting billet, clogging of the continuous casting nozzle, etc., and achieves a good welding performance, a small number of pinholes, and a simple and easy smelting process. Effect

Active Publication Date: 2017-06-20
QINGDAO SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above problems, the present invention provides a relatively simple and general low-carbon and low-silicon welding wire steel smelting process. The specific process is molten iron pretreatment desulfurization-80t converter-90t LF refining furnace-continuous casting 150mm×150mm billet, the purpose is to ensure On the basis of the welding performance of welding wire steel, the problems of continuous casting nozzle blockage and more air bubbles in the casting slab have been successfully solved, so as to produce qualified continuous casting billets

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Low carbon and low silicon welding wire steel H08E, the smelting process steps are:

[0034] 1) The molten iron was pretreated by spraying granular magnesium for desulfurization, and the sulfur content of the molten iron was 0.011%, and the slag removal operation was carried out;

[0035] 2) Control requirements for the composition of the tapping at the end of the converter: C: 0.04%, Si: 0.002%, P: 0.011%, S: 0.027%; the tapping temperature is 1624°C; the deoxidation alloying is carried out during tapping, and the order and weight of the alloys are added. It is: adding 4.5kg / t low carbon manganese after tapping 1 / 3, adding 0.45kg / t aluminum ingot and 0.85kg / t silicon calcium barium to 2 / 3 tapping; good slag retention during tapping scum.

[0036]3) The oxygen content of the LF furnace entering the station is 0.0030%, without adding aluminum and ferromanganese, and the mass of the slagging material added afterward is: lime 7.05kg / t steel, wollastonite 5.6kg / t steel, fl...

Embodiment 2

[0040] Low carbon and low silicon welding wire steel H08E, the smelting process steps are:

[0041] 1) The molten iron was pretreated by spraying granular magnesium for desulfurization, and the sulfur content of the molten iron was 0.007%, and the slag removal operation was carried out;

[0042] 2) The control requirements for the composition of the tapping at the end of the converter: C: 0.04%, Si: 0.002%, P: 0.013%, S: 0.026%; the tapping temperature is 1641 ℃; the deoxidation alloying is carried out during tapping, and the order and weight of the alloys are added. It is: adding 4.6kg / t low carbon manganese after tapping 1 / 3, adding 0.52kg / t aluminum ingot and 0.95kg / t silicon calcium barium to 2 / 3 tapping; good slag retention during tapping scum.

[0043] 3) The oxygen content of the LF furnace entering the station is 0.0030%, and there is no need to add aluminum and ferromanganese. The mass of the slag-forming materials added after that is: lime 7.2kg / t steel, wollastonit...

Embodiment 3

[0047] Low carbon and low silicon welding wire steel H08E, the smelting process steps are:

[0048] 1) The molten iron was pretreated by spraying granular magnesium for desulfurization, and the sulfur content of the molten iron was 0.012%, and the slag removal operation was carried out;

[0049] 2) The control requirements for the composition of the tapping at the end of the converter: C: 0.043%, Si: 0.001%, P: 0.011%, S: 0.022%; the tapping temperature is 1637 °C; the deoxidation alloying is performed during tapping, and the order and weight of the alloys are added. It is: adding 4.4kg / t low carbon manganese after tapping 1 / 3, adding 0.55kg / t aluminum ingot and 1.02kg / t silicon calcium barium to 2 / 3 tapping; good slag retention during tapping scum.

[0050] 3) The oxygen content of the LF furnace entering the station is 0.0050%, 30kg of ferromanganese is added, and then the amount of slag-forming materials added is: lime 7.1kg / t steel, wollastonite 5.6kg / t steel, fluorite 0....

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Abstract

The invention discloses a smelting method for low-carbon low-silicon wire-welding steel. The process flow of the smelting method comprises the following procedures: pretreatment and desulphurization of molten iron; treatment in a converter; LF refining; and continuous casting of small square billet with a size of 150 mm * 150 mm. With the smelting method, carbon content is stably controlled to be less than or equal to 0.08%; silicon content is stably controlled to be less than or equal to 0.027%; total oxygen content is no more than 0.0040%; the problem of nozzle clogging is overcome; and surface and internal quality of a casting blank is greatly improved. The process flow of the smelting method is simple and has low cost; and equipment used in the smelting method is conventional production equipment for iron and steel manufacture, is simple to operate, has good versatility and saves energy.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and particularly relates to a smelting method for low-carbon and low-silicon welding wire steel. Background technique [0002] In recent years, due to the great progress of steel smelting and rolling technology, the properties of steel have generally been greatly improved, but the development of weld metal is relatively slow, especially welding steel is facing the same problem. The performance of steel has become a top priority. [0003] The weldability of steel mainly depends on its chemical composition. The carbon content has a great influence on the properties of the steel. With the increase of the carbon content in the steel, the yield strength and tensile strength increase, but the plasticity and impact toughness will decrease. If the carbon content exceeds 0.23%, the welding performance of the steel will deteriorate. Therefore, the carbon content of welding steel general...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/30C21C7/06
Inventor 张虎肖超刘欣甄先锋张海涛王时松逯伟于文浩
Owner QINGDAO SPECIAL STEEL CO LTD
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