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Re-melting slag system used for electroslag re-melting high-titanium low-aluminum type steel type and smelting technique

A technology of electroslag remelting and remelting slag, which is applied in the field of electroslag metallurgy and can solve problems such as uneven composition of aluminum and titanium

Active Publication Date: 2017-06-13
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the unevenness of aluminum and titanium components in the process of electroslag remelting high-titanium and low-aluminum steels in the prior art, the present invention provides a remelting slag for electroslag remelting high-titanium and low-aluminum steels Department and smelting process

Method used

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  • Re-melting slag system used for electroslag re-melting high-titanium low-aluminum type steel type and smelting technique
  • Re-melting slag system used for electroslag re-melting high-titanium low-aluminum type steel type and smelting technique
  • Re-melting slag system used for electroslag re-melting high-titanium low-aluminum type steel type and smelting technique

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Effect test

Embodiment 1

[0027] For 1Cr21Ni5Ti stainless steel, using the method established by the present invention, according to the composition characteristics of the consumable electrode, the composition of the base slag is determined to be: CaF 2 :Al 2 o 3 :CaO:MgO=65:20:5:10. Add 2%, 5%, and 10% TiO to the base slag respectively 2 MoSi 2 The slag-gold balance experiment at 1577°C in the resistance furnace is recorded as T1, T2, and T3 respectively. Using the slag molecular ion coexistence theory to calculate the concentration, combined with the Al, Ti in the steel and Al in the slag in the equilibrium state in the slag-gold balance experiment results 2 o 3 and TiO 2 content, activity coefficient term Amendment, using formula (2) to get TiO 2 content, such as figure 2 shown.

[0028] When the Ti content in the electroslag ingot is required to be 0.60 and the Al content to be 0.04, the TiO in the primary slag at the liquidus line of the steel grade is 1477°C can be calculated through ...

Embodiment 2

[0032] For 1Cr21Ni5Ti stainless steel, adopt the method established by the present invention, according to the composition characteristics of the consumable electrode, determine that the base slag composition is CaF 2 :Al 2 o 3 :CaO:MgO=65:20:5:10. Add 2%, 5%, and 10% TiO to the base slag respectively 2 MoSi 2 The slag-gold balance experiment at 1577°C in the resistance furnace is recorded as T1, T2, and T3 respectively. Using the slag molecular ion coexistence theory to calculate the concentration, combined with the Al, Ti in the steel and Al in the slag in the equilibrium state in the slag-gold balance experiment results 2 o 3 and TiO 2 content, activity coefficient term Amendment, using formula (2) to get TiO 2 content, such as image 3 shown.

[0033] When the Ti content in the electroslag ingot is required to be 0.45 and the Al content is 0.06, the TiO in the primary slag at the liquidus line of the steel grade is 1477°C is calculated through this figure. 2 Th...

Embodiment 3

[0037] For 1Cr18Ni9Ti stainless steel, adopt the method established by the present invention, according to the composition characteristics of the consumable electrode, determine that the base slag composition is CaF 2 :Al 2 o 3 :CaO:MgO=65:25:0:10. Add 1.5%, 2.5%, 5.5% TiO to the base slag respectively 2 MoSi 2 The slag-gold balance experiment at 1577°C in the resistance furnace is recorded as T1, T2, and T3 respectively. Using the slag molecular ion coexistence theory to calculate the concentration, combined with the Al, Ti in the steel and Al in the slag in the equilibrium state in the slag-gold balance experiment results 2 o 3 and TiO 2 content, activity coefficient term Amendment, using formula (2) to get TiO 2 content, such as Figure 4 shown.

[0038] When the Ti content in the electroslag ingot is required to be 0.35 and the Al content to be 0.05, the TiO in the primary slag at the liquidus line of the steel grade is 1483°C is calculated from the figure. 2 T...

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Abstract

The invention discloses a re-melting slag system used for electroslag re-melting high-titanium low-aluminum type steel type and a smelting technique. The problem of unevenness of components, in the electroslag ingot axial direction, of aluminum and titanium in electroslag re-melting is solved. Base slag adopts a TiO2-free low-CaO slag system; and according to the component range of the base slag, CaF2:Al2O3:CaO:MgO is equal to (65-70%):(18-22%):(0-5%):(6-10%), wherein SiO2 is less than 0.8%, and FeO is less than 0.2%. Firstly, in an initial slag system, through the balancing principle of molten slag and Ai and Ti in molten steel, the TiO2 content of initial slag is determined under the liquidus temperature of a target steel type; and then in the molten slag temperature rising stage of a re-melting initial stage, extra TiO2 is continuously and evenly replenished into the slag, and the total replenishing quantity is the difference value of the TiO2 contents obtained through calculation in balancing under the temperature of 1677 DEG C and the liquidus temperature of the target steel type. According to the re-melting slag system used for the electroslag re-melting high-titanium low-aluminum type steel type and the smelting technique, the Ai and Ti in the molten steel in the temperature rising stage of the re-melting initial stage and the molten slag approach a thermodynamic equilibrium state, interreaction between the aluminum and the titanium is lowered, evenness of the components, in the electroslag ingot axial direction, of the aluminum and the titanium is improved, and the component qualification rate and the finishing product rate of a product are increased.

Description

technical field [0001] The invention belongs to the technical field of electroslag metallurgy, and relates to a remelting slag system and a smelting process for electroslag remelting of high-titanium and low-aluminum steel types. Background technique [0002] High-titanium and low-aluminum steel types (such as 1Cr21Ni5Ti, 1Cr18Ni9Ti) are duplex stainless steels stabilized by titanium. In order to ensure good intergranular corrosion resistance, there are strict requirements on the control range of Al and Ti content in the steel. Electroslag remelting, as a secondary melting technology for high-titanium and low-aluminum steel types, can further refine the steel types to achieve the effect of desulfurization and removal of inclusions, but it is still advanced in the control of Al and Ti composition uniformity at home and abroad. A big problem. At present, in the process of electroslag remelting of high-titanium and low-aluminum steel, the unreasonable design of the slag system...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18C22C38/50C22C38/06C22C33/06
CPCC22B9/18C22C33/06C22C38/06C22C38/50
Inventor 姜周华侯栋董艳伍龚伟侯志文曹玉龙曹海波
Owner NORTHEASTERN UNIV
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