Smelting method of welding rod steel H08Mn

A smelting method and welding rod steel technology, applied in the field of iron and steel metallurgy, can solve the problems of poor pourability of molten steel, oxygenation of molten steel, etc., achieve the effects of reducing the amount of formation, stabilizing oxygen content, and controlling bubble defects

Inactive Publication Date: 2021-01-29
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for smelting welding rod steel H08Mn, which is used to solve the problems of serious oxygenation of molten steel and poor castability of molten steel in the prior art

Method used

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  • Smelting method of welding rod steel H08Mn

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Embodiment 1

[0040] Such as figure 1 As shown, the welding rod steel H08Mn is smelted through converter smelting, LF refining, and continuous casting. The specific operation is as follows: the blast furnace molten iron is smelted through the converter to control the carbon content at the end point to 0.03%, and the tapping process uses Al-Mn-Fe alloy for pre-deoxidation, Al-Mn-Fe alloy The addition amount is 4kg / t, 11kg / t of medium-carbon ferromanganese, 3kg / t of active lime, 0.0057% of the refining furnace entering the station to fix oxygen; 0.6kg / t of refining slagging agent is added to the refining furnace according to the condition of oxygen fixing, and aluminum Line 0.16kg / t, heat up for 16 minutes once, oxygen 0.0043%; add refining slagging agent 0.4kg / t before the second temperature rise, feed aluminum wire 0.05kg / t, heat up 8 minutes for the second time, fix oxygen 0.0062%, Add 1.4kg / t of medium-carbon ferromanganese alloy during the heating process; add 0.2kg / t refining slagging a...

Embodiment 2

[0043] Welding rod steel H08Mn is smelted through converter smelting, LF refining, and continuous casting. The specific operation is: the blast furnace molten iron is smelted through the converter to control the carbon content at the end point to 0.03%. The tapping process uses Al-Mn-Fe alloy for pre-deoxidation. 4.5kg / t, add medium carbon ferromanganese 11kg / t, active lime 3kg / t, refining furnace fixed oxygen 0.0038%; add refining slagging agent 0.4kg / t before heating up once, feed aluminum wire 0.05kg / t Heat up for 10 minutes, set oxygen at 0.0073%; add refining slagging agent 0.6kg / t before the second temperature rise, feed aluminum wire 0.14kg / t, heat up for the second time for 8 minutes, set oxygen at 0.0031%, add medium-carbon manganese during the second temperature rise Iron 1.2kg / t; heating up for three times for 4 minutes, fixed oxygen 0.0045%, molten steel Als content 0.0059%, feeding silicon-calcium wire 0.69kg / t, soft blowing for 11 minutes and leaving the station; ...

Embodiment 3

[0046] Welding rod steel H08Mn is smelted through converter smelting, LF refining, and continuous casting. The specific operation is: the blast furnace molten iron is smelted through the converter to control the carbon content at the end point to 0.04%. 4.1kg / t, add medium carbon ferromanganese 11kg / t, active lime 3kg / t, refining furnace fixed oxygen 0.0053%; add refining slagging agent 0.4kg / t before heating up once, feed aluminum wire 0.08kg / t, once Heat up for 10 minutes, set oxygen at 0.0042%; add refining slagging agent 0.4kg / t before the second temperature rise, feed aluminum wire 0.03kg / t, heat up for the second time for 7 minutes, set oxygen at 0.0048%, add medium-carbon manganese during the second temperature rise Iron 2kg / t; three times of heating for 3 minutes, fixed oxygen 0.0048%, molten steel Als content 0.0047%, feeding silicon-calcium wire 0.52kg / t, soft blowing for 10 minutes and then leaving the station; the continuous casting process uses a 150mm×150mm sectio...

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Abstract

The invention provides a smelting method of welding rod steel H08Mn, and particularly relates to the field of ferrous metallurgy. The smelting method includes the steps of converter smelting: blast furnace molten iron is smelted in a converter to control the endpoint carbon content at 0.03-0.04%, slag-stopping tapping is carried out, pre-deoxidation is carried out by using an aluminum-manganese-iron alloy in the tapping process, and a medium-carbon manganese-iron alloy and active lime are added after tapping; and LF refining: oxygen determination and temperature measurement are performed before each time of temperature rise, an aluminum wire is fed according to a fixed oxygen value, a refining slag modifier is added, the refining temperature rise time is predicted according to a temperature measurement value, the adding amount of the refining slag modifier is increased along with the prolonging of the temperature rise time, and the slag modifier is decomposed to form CO2, the CO2 continuously escapes to form foam slag, so that air is effectively isolated, and molten steel oxygen uptake is weakened; and the oxygen content of molten steel can be controlled to be 0.0030%-0.0060%, theAls content can be controlled to be 0.0035%-0.0065%, then the molten steel is fed into a silicon-calcium line to be subjected to calcium treatment, soft blowing is conducted for 8 min-10 min, and thenthe molten steel is poured on a table. The smelting method of the welding rod steel H08Mn has the characteristics of weakening the oxygen uptake degree of the molten steel, overcoming the bubble defect of a casting blank, reducing the aluminum oxide inclusion formation amount of the molten steel, improving the castability of the molten steel, and ensuring the stable oxygen content of the molten steel.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a method for smelting electrode steel H08Mn. Background technique [0002] H08Mn welding rod steel is an important raw material for welding rod production. It belongs to low-carbon, low-silicon, low-aluminum steel with a certain manganese content. %. Add aluminum-containing deoxidizer to deoxidize during the smelting process of H08Mn electrode steel converter. During the refining process, the molten steel absorbs oxygen seriously, so it is necessary to add aluminum-containing deoxidizer to continue deoxidation, and the addition of aluminum-containing deoxidizer will form a large amount of high-melting point alumina inclusions, which are easy to accumulate The tundish nozzle affects the pourability of molten steel. If the deoxidation depth is insufficient, the slab is prone to bubble defects. Therefore, the production of H08Mn welding rod steel needs to take into accoun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C7/076
CPCC21C5/28C21C7/076Y02P10/20
Inventor 常全举景伟德顾兆祖姜军赵肖飞张俊同任文卓晁增武李金钢
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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