CN106591591A

CN106591591A - Electroslag remelting solid slag arc striking agent and arcing method thereof

Info

Publication number: CN106591591A
Application number: CN201710025154.XA
Authority: CN
Inventors: 张福利; 翟永臻; 李双江; 李博斌; 高宇; 李瑞杰; 李程; 窦磊; 张晓峰; 王卓
Original assignee: Hebei Iron and Steel Co Ltd
Current assignee: HBIS Co Ltd; Hebei Iron and Steel Co Ltd
Priority date: 2017-01-13
Filing date: 2017-01-13
Publication date: 2017-04-26
Anticipated expiration: 2037-01-13
Also published as: CN106591591B

Abstract

The invention discloses an electroslag remelting solid slag arc striking agent and an arcing method thereof. The electroslag remelting solid slag arc striking agent consists of the following components in percentages by mass: 3-5% of pre-melted slag, 0.3-0.5% of aluminum particles and the balance of scrap iron. The scrap iron is used as the main raw material of the solid slag arc striking agent, the scrap iron which is machining waste is recycled, the cost is low, secondary pollution does not exist, and the waste is reused; and moreover, resources are saved, the cost is greatly saved, and possibility of environmental pollution is eliminated. The method has the characteristics of simplicity in operation, stable process, high success rate and the like.

Description

Electroslag remelting solid slag striking agent and its starting the arc method

Technical field

The invention belongs to electroslag remelting technique field, especially a kind of electroslag remelting solid slag striking agent and its starting the arc method.

Background technology

Electroslag remelting is, the steel or alloy being smelt with general smelting process, the one of refine again to be carried out in water mold Plant metallurgical method.Electroslag striking method has two kinds of the solid slag starting the arc and the melt cinder starting the arc, and solid slag starting the arc agent typically adopts CaF₂+TiO₂Matter Pre- frit, it is by CaF₂Powder and TiO₂Powder is cooled down Jing after high melt and is broken into fritter, and cost of manufacture is up to 10 yuan/kg, while Melting and it is broken when easily pollute environment.

TiO₂Matter striking agent itself is frangible, it is impossible to consutrodes feeler inspection is received in shove charge, can only be in stationary furnace hair style electroslag Stove is used.TiO₂Also it is unstable oxide, easily causes steel ingot to increase Ti, therefore the striking agent can only smelt the higher steel of titaniferous Kind.Patent application 201610020094.8 discloses a kind of electroslag remelting striking agent and striking method, but the striking agent needs specially Door makes, it is desirable to higher, and complex process.

In addition, in the existing electroslag remelting starting the arc, substantially using manual mode, arcing voltage commonly reaches 40～55V, electricity Flow control by 0～5000A, easy arc extinguishing and impact bottom water case copper coin, current fluctuation is big.

The content of the invention

The technical problem to be solved in the present invention is to provide a kind of electroslag remelting solid slag striking agent of low cost；The present invention is also carried A kind of electroslag remelting solid slag starting the arc method of process is simple is supplied.

To solve above-mentioned technical problem, the present invention is by following weight/mass percentage compositions into being grouped into：Fritting slag particle 3～5%, Aluminum shot 0.3～0.5%, balance of iron filings.

Substance≤the 1g of iron filings of the present invention, the granularity≤1mm of fritting slag particle, the substance≤1g of aluminum shot.

Preferably, the fritting slag particle amount is 5%, and aluminum shot amount is 0.5%.

The inventive method, using above-mentioned solid slag striking agent, methods described technique is：20～30V of arcing voltage, electric current 2000 ～3500A.

After 5～10s of the starting the arc described in the inventive method, slag charge is added toward in electroslag furnace.

It is using the beneficial effect produced by above-mentioned technical proposal：The present invention adopts iron filings for primary raw material, can adopt Machining waste material iron filings carry out waste reclaimation, and low cost, non-secondary pollution realizes discarded recycling；And save money Source, greatlys save cost, eliminates the possibility of environmental pollution.

The inventive method has simple to operate, process stabilization, the features such as success rate is high.

Specific embodiment

With reference to specific embodiment, the present invention is further detailed explanation.

The solid slag striking agent of this electroslag remelting is mixed by iron filings, fritting slag particle and aluminum shot.Single iron filings grain is again iron filings Substance≤1g, mach waste material iron filings can be used Jing after removing oil drying is broken.The chemical composition of fritting slag particle and smelting It is consistent with slag during refining, granularity≤1mm；The starting the arc is difficult when the content of fritting slag particle is 5wt%～10wt%, easily rushes during less than 3wt% Bottom water case is hit, therefore the content of fritting slag particle is 3wt%～5wt%, preferably 5wt%.The removing groove that is added to of aluminum shot adds The iron scale that man-hour iron filings top layer produces, aluminum shot content easily makes steel ingot increase aluminum when being more than 0.5wt%, during less than 0.3wt% Easily bubble is produced in ingot casting bottom, therefore the content of aluminum shot is 0.3wt%～0.5wt%, preferably 0.5wt%；The substance of aluminum shot≤ 1g。

This electroslag remelting solid slag starting the arc method adopts following techniques：（1）To consutrodes retaining wall on slope, to be soldered to vacation On electrode；Producing waste iron filing during finished edge can be used as the composition of this solid slag striking agent.

（2）Dummy plate is put on bottom water case copper coin, it is placed above above-mentioned solid slag striking agent, paves.

（3）Install crystallizer, from Mao electrodes, rise a forearc will drop to apart from striking agent 15mm～40mm from Mao electrodes, if Determine starting the arc technological parameter, 20～30V of voltage, 2000～3500A of electric current.

（4）Automatic arc striking, after hearing arc sound or seeing 5～10s of arc light automatic slag adding machine is started, and is added toward in electroslag furnace Enter slag charge.

（5）Plus slag finish after enter the stage such as normalization slag, melting, until melting terminates.Whole process by computer controls, Human disturbance is not carried out.

Embodiment 1：The solid slag striking agent of this electroslag remelting and its starting the arc method adopt following concrete technologies.

Equipment adopts 500kg electroslag furnace under protective Ar gas stoves, crystallizer specification φ 300*1300mm, consutrodes specification φ 210* 1800mm, material is high temperature alloy Inconel718.

Striking agent proportioning is：94.5wt% iron filings, Single seed weight≤0.8g；5wt% pre-melted slags, granularity≤0.6mm；0.5wt% aluminum Grain, Single seed weight≤0.6g；Striking agent weight is 1kg, height 20mm.

Playing forearc will drop to apart from striking agent 20mm～30mm from Mao electrodes；Starting the arc technological parameter：Voltage 20V, electric current 3000A；After starting the arc 8s, slag charge is added toward in electroslag furnace.

Table 1 is the Inconel718 matrix constituents of the present embodiment and smelts finished product composition.

Table 1：Inconel718 component requirements and smelting finished product composition（wt%）

Element	C	Mn	Si	Ni	Cr	Mo	Ti	Al	Nb
										Matrix constituent	0.07	0.05	0.05	50	17	2.80	1.00	0.35	5.30
ESR ingot bottom composition	0.07	0.05	0.05	50	17	2.80	0.99	0.35	5.30

In table 1, the balance of Fe of composition and inevitable impurity.

Embodiment 2：The solid slag striking agent of this electroslag remelting and its starting the arc method adopt following concrete technologies.

Equipment adopts 1t electroslag furnace under protective Ar gas stoves, crystallizer specification φ 400*1300mm, consutrodes specification φ 280* 1800mm, material is H13.

Striking agent proportioning is：96.6wt% iron filings, Single seed weight≤1g；3wt% pre-melted slags, granularity≤1mm；0.4wt% aluminum shots, Substance≤1g；Striking agent weight is 1.5kg, height 25mm.

Playing forearc will drop to apart from striking agent 30mm～40mm from Mao electrodes；Starting the arc technological parameter：Voltage 30V, electric current 3500A；After starting the arc 10s, slag charge is added toward in electroslag furnace.

Table 2 is the H13 matrix constituents of the present embodiment and smelts finished product composition.

Table 2：H13 component requirements and smelting finished product composition（wt%）

Element	C	Si	Mn	P	S	Cr	Mo	V	Al（s）
										Matrix constituent	0.38	1.25	0.58	0.016	0.009	4.79	1.34	1.1	0.07
ESR ingot bottom composition	0.38	1.25	0.58	0.021	0.001	4.79	1.33	1.09	0.07

In table 2, the balance of Fe of composition and inevitable impurity.

Embodiment 3：The solid slag striking agent of this electroslag remelting and its starting the arc method adopt following concrete technologies.

Equipment adopts 50kg electroslag furnace under protective Ar gas stoves, crystallizer specification φ 130*800mm, consutrodes specification φ 80* 1200mm, steel grade is 26NiCrMoV14-5.

Striking agent proportioning is：95.7wt% iron filings, Single seed weight≤0.6g；4wt% pre-melted slags, granularity≤0.9mm；0.3wt% aluminum Grain, Single seed weight≤0.5g；Striking agent weight is 100g, height 15mm.

Playing forearc will drop to apart from striking agent 15mm～20mm from Mao electrodes；Starting the arc technological parameter：Voltage 25V, electric current 2000A；After starting the arc 5s, slag charge is added toward in electroslag furnace.

Table 3 is the 26NiCrMoV14-5 mother metal and product composition of the present embodiment.

Table 3：26NiCrMoV14-5 mother metals and product composition（wt%）

Element	C	Si	Mn	Cr	Mo	Ni	V	Al
									Matrix constituent	0.269	0.01	0.03	1.76	0.44	3.4	0.11	0.008
ESR ingot top	0.26	0.006	0.02	1.73	0.44	3.4	0.09	0.007

In table 3, the balance of Fe of composition and inevitable impurity.

Claims

1. a kind of electroslag remelting solid slag striking agent, it is characterised in that it is by following weight/mass percentage compositions into being grouped into：Pre-melted slag Grain 3～5%, aluminum shot 0.3～0.5%, balance of iron filings.

2. electroslag remelting solid slag striking agent according to claim 1, it is characterised in that：Substance≤the 1g of the iron filings, in advance Granularity≤the 1mm of slag grain, the substance≤1g of aluminum shot.

3. electroslag remelting solid slag striking agent according to claim 1 and 2, it is characterised in that：The fritting slag particle amount is 5%, Aluminum shot amount is 0.5%.

4. a kind of electroslag remelting solid slag starting the arc method, using the electroslag remelting solid slag striking agent described in claim 1,2 or 3, its It is characterised by, methods described technique is：20～30V of arcing voltage, 2000～3500A of electric current.

5. electroslag remelting solid slag starting the arc method according to claim 4, it is characterised in that：After 5～10s of the starting the arc, toward electroslag Slag charge is added in stove.