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LF Ladle Refining Furnace

LF Ladle Refining Furnace Introduction

LF ladle refining furnace is a bottom-blown argon ladle furnace with three-phase submerged arc heating under normal pressure. It is a device for refining molten steel in a ladle.

The customization range of LF ladle refining furnace is from 8 tons to 300 tons.

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Introduction Application Furnace Equipment Equipment Composition Technical Advantages Parameters Supply Process Technology Optimization Services

LF Ladle Refining Furnace Introduction

LF ladle refining furnace is a bottom-blown argon ladle furnace with three-phase submerged arc heating under normal pressure. It is a device for refining molten steel in a ladle.

Its main function is to strengthen thermodynamic and kinetic conditions in a non-oxidizing atmosphere through arc heating, reducing atmosphere in the furnace, high basicity reducing slag refining, gas stirring and other means, so that the molten steel can achieve comprehensive refining effects such as deoxidation, desulfurization, alloying and heating in a short time.

Ensure that the composition of molten steel is accurate, the temperature is uniform, and the inclusions are fully floated to purify the molten steel. At the same time, it coordinates the steelmaking and continuous casting processes well to ensure the smooth progress of multi-furnace continuous casting.

Sanrui is one of famous ladle refining furnace manufacturer and lf refining furnace suppliers in China. The customization range of LRF ladle refining furnace is from 8 tons to 300 tons.

Main Application of LF Ladle Refining Furnace

LF type ladle refining furnace can be used for refining molten steel in primary refining furnace (arc furnace, open hearth furnace, converter).

It is an important metallurgical equipment for producing high-quality carbon steel, alloy structural steel, bearing steel, tool steel, gold structural steel, stainless steel and other steel grades and meeting continuous casting and rolling.

The LF furnace refining method was previously mainly used for refining special steel. It is a ladle refining furnace production technology with arc heating, argon stirring and slag refining as the core.

Characteristics of LF Ladle Refining Furnace Equipment

1. The working conditions in the LRF ladle refining furnace are reducing gas and slightly positive pressure.

2. The electrode adjustment method is to adjust the three arms of the three-phase electrode separately.

3. Blow argon and stirring at the bottom of the ladle.

4. Add a certain amount of scrap into the ladle, use arc heating, temperature measurement and sampling to make the temperature control accurate, so as to optimize the pouring temperature.

5. Blow argon and stirring at the bottom of the ladle to make the temperature distribution of the molten steel uniform, the composition uniform, and the molten steel pure.

6. Slag removal, desulfurization, and impurity removal.

7. Adjust the alloy composition and use the alloy feeding system to make the composition control accurate so that the molten steel reaches the final required chemical composition.

8. Wire feeding processing: Using a wire feeder to directly feed various welding wires into the molten steel can significantly improve the yield rate of the alloy.

9. Smoke exhaust and dust removal. Equipped with a smoke exhaust and dust removal system, it can effectively control the smoke emission and make the smoke emission meet environmental protection requirements.

10. The water-cooled furnace cover is equipped with a dust removal interface that can adjust the size of the flue gas outlet, so that the furnace always operates under a slightly positive pressure reducing atmosphere;

11. The copper-steel composite conductive cross arm is used to reduce the electrode distribution circle diameter and increase the service life of the furnace lining;

12. Equipped with automatic or manual temperature measurement and sampling devices to accurately measure the temperature of molten steel;

13. The large current system uses large-section water-cooled cables, compensators, and copper-steel composite conductive cross arms to reduce the main circuit impedance;

14. The alloy and slag automatic feeding device is used to accurately measure the alloy and slag added to the bag;

15. Equipped with a PLC control system and smelting model;

LF Ladle Refining Furnace Equipment Composition

LF ladle refining furnace equipment consists of ladle, ladle car and towing cable, wire feeder, ladle cover and ladle cover lifting device, heating bridge, electrode lifting mechanism, conductive cross arm and electrode lifting device, short net, water cooling system, compressed air system, hydraulic system, argon system, temperature measurement and sampling device, automatic feeding system, ladle furnace transformer, high voltage cabinet, low voltage electrical and PLC automatic control system, etc.

The furnace can be customized with tonnage ranging from 10 tons to 300 tons.

Sanrui LF Ladle Refining Furnace Technical Advantages

Reliable Operation and Low Cost

The high current system of the LF Ladle Refining Furnace uses pure copper as the conductive medium, and the resistance of the entire circuit is small. Taking full account of the skin effect when the current passes through the conductor, the cross arm adopts a box-type copper-steel composite plate structure, which can effectively reduce the resistance and heat generation. Reasonable high current system layout makes the impedance of each current smaller.

The Structure of the LF Ladle Refining Furnace is Reasonable, Safe and Stable

The LF ladle refining furnace can be used in the form of bridge frame, furnace cover independent frame; single arm, three arms. Ladle rotary table, furnace cover rotation, etc. The whole set of hydraulic drive is equipped with an accumulator, which plays the role of hydraulic system voltage stabilization, making the equipment run more stably. At the same time, in emergencies such as power outages, the unfinished field actions of the equipment can continue to be executed, which improves the safety of smelting.

Reduced Electrode Consumption

The use of an anti-electrode breakage system can effectively reduce the probability of electrode breakage during the smelting process. Especially in the process of scrap steel melting, avoiding electrode breakage is equivalent to saving a whole furnace of molten steel and reducing economic losses.

Simple and Convenient Operation

The electrical automation control adopts a human-machine interface, which simulates the real furnace form and is easy to operate. Batching, loading, smelting, and steel tapping can all be operated on the computer.

Refined Steel of Many Types and High Quality

It is an intermediate process equipment for refining the molten steel in the primary refining furnace to further improve the quality of the molten steel. It can refine bearing steel, alloy structural steel, tool steel, high-quality carbon structural steel, etc.

Diversified Dust Removal System

We are equipped with a variety of dust removal systems, which can be equipped with different forms of dust removal equipment according to the environmental protection requirements of different countries.

Main Technical Parameters of LF Ladle Refining Furnace

S/N	Rated Capacity (t)	Transformer Rated Capacity (MVA)	Transformer Primary Voltage (kV)	Transformer Secondary Voltage(v)	Secondary Rated Current (A)	Graphite Electrode Diameter (mm)	Molten Steel Temperature Rise Speed (℃/min)
1	20	4	6	210-170	16495	φ350(HP)	≥3.5
2	30	6	6.3	210-170	17320	φ350(HP)	≥3.7~4.2
3	40	8	6.3	210-170	17320	φ350(HP)	>3.8
4	50	10	35	250-160	28867	φ400(HP)	>4~4.5
5	60	11	35	250-160	31754	φ400(HP)	>4~4.5
6	70	13	35	270-180	32632	φ400(HP)	>4~4.5
7	80	15	35	320-240	32075	φ400(HP)	≥4.5
8	90	16	35	320-240	32991	φ400(HP)	≥5
9	100	18	35	330-210	37115	φ450(HP	≥5
10	110	18	35	330-210	37115	φ450(HP)	≥4.5
11	120	20	35	340-220	39817	p450(HP	≥4.5
12	130	22	35	360-240	40973	p450(HP)	≥4.5
13	140	24	35	400-280	40754	φ450(HP)	≥4.5
14	150	26	35	410-290	41697	φ450(HP)	≥4.5
15	160	28	35	430-310	42541	φ450(HP)	≥5
16	170	30	35	450-330	44411	φ450(HP)	≥5
17	180	32	35	470-350	46188	φ500(HP)	≥5
18	190	34	35	490-370	47878	φ500(HP)	≥5
19	200	36	35	500-380	48336	φ500(HP)	≥5
20	210	38	35	520-40	49862	φ500(HP)	≥5
21	220	40	35	540-400	48619	φ500(HP)	≥5
22	230	40	35	540-400	48619	φ500(HP)	≥5
23	240	42	35	530-390	52714	φ500(HP)	≥5
24	250	44	35	535-400	55224	φ500(HP)	≥5
25	260	46	35	550-410	55329	φ550(HP)	≥5
26	270	48	35	560-420	56556	p550(HP	≥5
27	280	50	35	570-430	57735	0550(HP	≥5
28	290	52	35	590-430	60044	φ600(HP)	≥5
29	300	54	35	610-450	62353	φ600(HP)	≥5

The above data are just for your reference, details are subject to further discussion.

Scope of LF Ladle Refining Furnace Supply

Mechanical Equipment: ladle, steel ladle car and towing cable device, electrode lifting mechanism, water-cooled furnace cover, heating bridge, furnace cover lifting mechanism, manual temperature measuring device, alloy feeding system, electrode extension device, wire feeding acquisition and merger, wire feeding machine water-cooled lifting duct and wire feeding machine platform.

Electrical and Automation Equipment: short network system, transformer, high-voltage power supply and distribution system, low-voltage power supply and distribution system, automation system.

Auxiliary Equipment: hydraulic system, cooling water system, argon system, compressed air system, electric lubrication system.

LF Ladle Refining Furnace Smelting Process

LF ladle refining furnace steelmaking process: preparation before refining → converter steel tapping and charging → crane lifting → sitting in the ladle car → connecting argon blowing pipe → ladle opening to refining station → lowering furnace cover → lowering electrode heating → temperature measurement and sampling → adding the first batch of deoxidizer and supplementing slag → alloy fine-tuning and adding the second batch of deoxidizer (slag white) → temperature measurement and power supply adjustment → refining control temperature → wire feeding → soft argon blowing → adding insulation → hanging ladle to continuous casting

Arc heating and heating under normal pressure, temperature measurement and sampling, and precise control of the final temperature to optimize the pouring temperature;

Synthetic slag refining, desulfurization, desulfurization Oxygen, degassing, and inclusion removal;

Bottom blowing argon gas stirring to make the molten steel temperature uniform, uniform and pure;

Fine-tuning of alloys to control the composition accurately, and the final required chemical composition can be efficiently achieved through ferroalloy elements or aluminum or wire feeding;

Equipped with a wire feeder, the molten steel is desulfurized and deoxidized, the morphology and distribution of inclusions are changed, and the alloy elements are accurately controlled. At the same time, it has high alloy recovery rate, small temperature drop of molten steel, and low environmental pollution;

As a buffer device between the primary refining furnace and the continuous casting machine, it ensures the matching production of the primary refining furnace and the continuous casting, and realizes multi-furnace continuous casting.

Sanrui LF 20T Ladle Refining Furnace Technology Optimization

Duplex rotating electrode.

Dual-station technology for ladle turret.

Online wire feeding technology.

Automatic temperature measurement and sampling technology.

Increase scrap steel technology.

Automatic argon blowing control technology.

LF one-click steelmaking technology.

Services Provided by Sanrui

1As an ladle refining furnace manufacturer in China, Sanrui can provide basic LF Ladle refining furnace layout and layout drawings

2Sanrui will send engineers to your factory to install and debug the machine, and provide reliable after-sales service.

3Sanrui provides training for operators and maintenance personnel, and the smelting equipment is easy to operate and maintain

4Competitive price and excellent quality

5Low investment, high production efficiency, high rate of return

6Stable performance of smelting equipment, safe production

7Products can be customized according to different needs

8Production capacity can be adjusted according to customer requirements

9Environmentally friendly, low energy consumption

Sanrui is a well experience of lf refining furnace suppliers in designing, manufacturing, installing, commissioning and putting into production steelmaking process equipment.

Sanrui provides LF ladle refining furnace engineering consulting, including R&D, design, equipment supply, system integration and software compilation, construction, installation, commissioning, project management, technical services and training, production guidance, operation and maintenance, spare parts supply and other comprehensive engineering and technical services.

Send us your project details and our engineering team will design a LF ladle refining furnace steelmaking production line solution according to your needs.