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Smelting method for low-carbon low-silicon wire-welding steel

A low-carbon, low-silicon, welding wire steel technology, applied in the manufacture of converters, etc., can solve the problems of many billets with bubbles, clogging of continuous casting nozzles, etc., and achieve the effects of good welding performance, fewer pinholes, and good quality.

Active Publication Date: 2015-08-26
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 low-silicon welding wire steel H08E, its smelting process steps are:

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

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

[0036]3) The oxygen content of the LF furnace entering the station is 0.0030%, no need to add ferroaluminum manganese, and the quality of the slagging material added afterwards is: lime 7.05kg / t steel, wollastonite 5.6kg / t steel, fluorite 0.6kg / t steel During the refining process, calcium carbide is added to the slag surface sev...

Embodiment 2

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

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

[0042] 2) Control requirements for tapping composition at the end of the converter: C: 0.04%, Si: 0.002%, P: 0.013%, S: 0.026%; tapping temperature 1641°C; deoxidation alloying during tapping, order and weight of alloys added It is: add 4.6kg / t low-carbon manganese after tapping 1 / 3, add 0.52kg / t aluminum ingot and 0.95kg / t silicon-calcium-barium to tap 2 / 3; scum.

[0043] 3) The oxygen content of the LF furnace entering the station is 0.0030%, no need to add ferroaluminum manganese, and the quality of the slagging material added afterwards is: lime 7.2kg / t steel, wollastonite 5.7kg / t steel, fluorite 0.85kg / t; During the refining process, calcium carbide is added to the slag surface several times, the tot...

Embodiment 3

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

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

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

[0050] 3) The oxygen content of the LF furnace entering the station is 0.0050%, and 30kg of ferro-aluminum manganese is added, and then the amount of slagging material added is: lime 7.1kg / t steel, wollastonite 5.6kg / t steel, fluorite 0.9kg / t t steel; during the refining process, calcium carbide was added to the slag surface several ti...

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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, in particular to a method for smelting 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. Carbon content has a great influence on the performance of steel. With the increase of carbon content in steel, the yield strength and tensile strength will increase, but the plasticity and impact toughness will decrease. If the carbon content exceeds 0.23%, the welding performance of steel will deteriorate. , so the carbon content of steel for welding generally does not exceed 0.20%, a...

Claims

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Application Information

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Patent Type & Authority Applications(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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