CN106244819A - A kind of striking agent of electroslag remelting and preparation method thereof - Google Patents

Abstract

The present invention proposes the striking agent of a kind of electroslag remelting, its component and percentage by weight: CaF₂Powder: 60%～70%；Al₂O₃Powder: 20%～25%；TiO₂Powder: 3～5%；Remaining is the metal fillings of steel grade of the same race.The present invention also proposes the manufacture method of this striking agent.The striking agent of the electroslag remelting of the present invention uses CaF₂‑TiO₂‑Al₂O₃Based on system, and be aided with metal fillings and make according to specific component proportion, only need to rap after cooling molding and be i.e. separable into bulk, and keep for a long time being not pulverized easily；The raw material of striking agent is through overbaking, then through fritting refining treatment, in slag, moisture and oxidizable element are effectively removed, and improve the cleanliness factor of remelting steel；Component reduces TiO₂Ratio, the part steel grade high to leaded wastewater is the most applicable, and due to not carbon containing in striking agent component, steel grade low for carbon containing also will not cause carburetting problem.

Description

A kind of striking agent of electroslag remelting and preparation method thereof

Technical field

The present invention relates to metal smelt technical field, particularly to the striking agent of a kind of electroslag remelting and this striking agent Manufacture method.

Background technology

Electroslag remelting is also known as secondary remelting, its distinguishing feature be that the metal produced is pure, composition and even tissue, knot Structure is fine and close, excellent product performance.Striking agent is also known as Conductive Slag, striking slag, and its effect is to set up electroslag ignition Process.Tradition is drawn Arc agent uses CaF₂Powder, TiO₂The high melt after certain ratio mixing such as powder forms, and this type of striking agent is due to containing TiO₂, The steel grade of remelting leaded wastewater is easily generated TiN field trash, is unfavorable for product quality；Also the striking agent having uses graphite auxiliary with Fluorspar Powder Mix with bath of glass, but when electroslag remelting is carried out for the steel grade of low carbon content, owing to striking agent phosphorus content is high, Yi Zao ESR ingot low power carbon content is become to exceed standard and scrap.

Following condition need to be possessed: 1 as striking agent) there is certain electric conductivity, the easy starting the arc；2) have relatively low fusing point and Viscosity, low fusing point is beneficial to the quick formation in molten bath, and relatively low viscosity is so that ESR ingot lower surface smooths；3) have and relatively close Suitable structure, the material after melting cooling is not pulverized easily, and keeps block structure, it is simple to striking.Three above condition and striking agent Component closely bound up with proportioning, but striking agent making with produce in, owing to usually ignoring each component and proportioning, produce Striking agent quality uneven, striking poor effect, produce a large amount of waste product, more have part striking agent not conform to due to proportioning component Suitable, in striking agent cooling shattering process, there is component crystal conversion, cause occurring that efflorescence is serious, it is impossible to keep for a long time, and Cannot use.

Summary of the invention

The problem existed for the striking agent in existing application and the demand of use, it is an object of the invention to provide a kind of special Determine striking agent material and the making thereof of the easy starting the arc of component and proportioning, low melting point, low viscosity and the electroslag remelting being not pulverized easily Method.

To achieve the object of the present invention, the composition of the striking agent of a kind of electroslag remelting of the present invention and percentage by weight For: CaF₂Powder: 60%～70%；Al₂O₃Powder: 20%～25%；TiO₂Powder: 3～5%；Remaining is the metal fillings of steel grade of the same race； Wherein, TiO₂TiO in powder₂Content >=95%, granularity is≤100 mesh；CaF₂CaF in powder₂Content >=95%, granularity is≤100 Mesh；Al₂O₃Al in powder₂Content >=95% of O, granularity is≤100 mesh；Metal fillings is without greasy dirt, anhydrous dry electroslag remelting together The turning scrap of steel grade, length and width are all not more than 20mm.

According to another object of the present invention, the manufacture method of the striking agent of a kind of electroslag remelting of the present invention includes as follows Step:

S1: by the TiO by requirements above proportioning₂Powder, Al₂O₃Powder, CaF₂It is some that powder weighs weight, puts into oven, insulation Baking more than 2h；

S2: the slag charge after baking is added melting in electroslag slag hearth or electroslag furnace in batches, first adds CaF₂Powder, treats CaF₂ TiO is added again time the most melted₂Powder, Al₂O₃Powder and the homogeneous mixture of metal fillings, be dividedly in some parts, and each addition is gross weight 10-20%, is repeatedly uniformly added into；

S3: melting electric current controls 1000-3000A, and voltage is 45-55V, refine again after slag charge is completely in molten condition 10-20min；And

S4: to be refined complete after non-shock chilling, then take out broken cooling, rap and be broken for bulk, be dried and keep.

The striking agent of the electroslag remelting of the present invention uses CaF₂-TiO₂-Al₂O₃Based on system, and be aided with metal fillings by Make according to specific component proportion, only need to rap and be i.e. separable into bulk after cooling molding, and keep for a long time being not pulverized easily； The raw material of striking agent is through overbaking, then through fritting refining treatment, in slag, moisture and oxidizable element are effectively removed, and improves The cleanliness factor of remelting steel；Component reduces TiO₂Ratio, the part steel grade high to leaded wastewater is the most applicable, and due to striking Not carbon containing in agent component, steel grade low for carbon containing also will not cause carburetting problem.

Accompanying drawing explanation

By detailed description below in conjunction with the accompanying drawings, the aforesaid objects, features and advantages with other of the present invention will become Obviously.Wherein:

Fig. 1 show the process sequence diagram of the manufacture method of the striking agent of the electroslag remelting of the present invention.

Detailed description of the invention

With reference to the process sequence diagram of manufacture method of striking agent of the electroslag remelting of the present invention shown in Fig. 1, and combine Feature and the advantage of the specific embodiment detailed description present invention are as follows.

Embodiment one: manufacture the 100Kg striking agent material of electroslag remelting

1, slag charge is weighed: according to TiO₂: Al₂O₃: CaF₂: metal fillings=5:25:65:5 mass percent carries out weighing joining Material, TiO₂Powder 5Kg, Al₂O₃Powder 25Kg, CaF₂Powder 65Kg, considers 5Kg to be worth doing with the metal turning of steel grade；

2, by weighted TiO₂Powder, Al₂O₃Powder, CaF₂Powder puts into 400 DEG C of ovens, afterheat baking 3h；

3, the powder after baking is added melting in electroslag slag hearth or electroslag furnace, initial current 1000A, voltage in batches 45V, first adds CaF₂Powder, treats CaF₂TiO is added again time the most melted₂Powder, Al₂O₃Powder and the mixture of metal fillings, be dividedly in some parts, every time Addition is the 15% of gross weight, is repeatedly uniformly added into；

4, it is gradually increased electric current and increases to 52V to 3000A, voltage, keep current/voltage value to continue after melting completely again Refine 20min；

5, after standing cooling 30min, start the demoulding, rap the striking agent after the demoulding, tap into kept dry after bulk, draw Arc agent has been manufactured.

Embodiment two: manufacture the 50Kg striking agent material of electroslag remelting

1, slag charge is weighed: according to TiO₂: Al₂O₃: CaF₂: metal fillings=5:20:70:5 mass percent carries out weighing joining Material, TiO₂Powder 2.5Kg, Al₂O₃Powder 10Kg, CaF₂Powder 35Kg, considers 2.5Kg to be worth doing with the metal turning of steel grade；

2, by the most weighted TiO₂Powder, Al₂O₃Powder, CaF₂Powder puts into 400 DEG C of ovens, afterheat baking 4h；

3, the slag charge after baking is added melting in electroslag slag hearth or electroslag furnace, initial current 1000A, voltage in batches 50V, first adds CaF₂Powder, treats CaF₂TiO is added again time the most melted₂Powder, Al₂O₃Powder and the mixture of metal fillings, be dividedly in some parts, every time Addition is the 20% of gross weight, is uniformly added into several times；

4, it is gradually increased electric current and increases to 55V to 3000A, voltage, keep current/voltage value to continue after melting completely again Refine 10min；

5, after standing cooling, start the demoulding, rap the striking agent after the demoulding, tap into kept dry after bulk, striking agent Manufacture.

The striking agent of the electroslag remelting of the present invention uses CaF₂-TiO₂-Al₂O₃Based on system, and be aided with metal fillings by Make according to specific component proportion, compare with tradition striking agent and have the advantage that 1) owing to being aided with metal fillings, after cooling molding only Need to rap, i.e. be separable into bulk, keep for a long time being not easy to efflorescence；2) this striking agent is in the fabrication process, and raw material passes through Baking processes, then through fritting refining treatment, in slag, moisture and oxidizable element are effectively removed, and improve the cleaning of remelting steel Degree；3) component reduces TiO₂Ratio, the part steel grade high to leaded wastewater is the most applicable, and owing to striking agent component not containing Carbon, steel grade low for carbon containing also will not cause carburetting problem.

The invention is not limited in described embodiment, those skilled in the art is in the spirit without departing from the present invention i.e. public affairs In the range of opening, still can make some revise or change, therefore the scope of the present invention with claims limit in the range of Accurate.

Claims (2)

1. the striking agent of an electroslag remelting, it is characterised in that component and the percentage by weight of described striking agent be: CaF₂Powder: 60%～70%；Al₂O₃Powder: 20%～25%；TiO₂Powder: 3～5%；Remaining is the metal fillings of steel grade of the same race；Wherein, TiO₂Powder Middle TiO₂Content >=95%, granularity is≤100 mesh；CaF₂CaF in powder₂Content >=95%, granularity is≤100 mesh；Al₂O₃In powder Al₂Content >=95% of O, granularity is≤100 mesh；Metal fillings is with the turning of steel grade without greasy dirt, anhydrous dry electroslag remelting Bits, length and width are all not more than 20mm.

2. the manufacture method of the striking agent of an electroslag remelting, it is characterised in that described manufacture method comprises the steps:

S1: by the TiO of the proportioning according to claim 1₂Powder, Al₂O₃Powder, CaF₂It is some that powder weighs weight, puts into oven, and insulation is dried Roasting more than 2h；

S2: the slag charge after baking is added melting in electroslag slag hearth or electroslag furnace in batches, first adds CaF₂Powder, treats CaF₂All TiO is added again time melted₂Powder, Al₂O₃Powder and the homogeneous mixture of metal fillings, be dividedly in some parts, and each addition is the 10-of gross weight 20%, repeatedly it is uniformly added into；

S3: melting electric current controls 1000-3000A, and voltage is 45-55V, refine 10-again after slag charge is completely in molten condition 20min；And

S4: to be refined complete after non-shock chilling, then take out broken cooling, rap and be broken for bulk, be dried and keep.