ABB EMBR 冶金效果介绍
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• Reduced breakout risk.
• Reduced mixing zone at grade changes.
• Substantial improvement in product quality, resulting in decreases in material down-grading and customer rejections.
EMBR improves quality and productivity
EMBR
Less penetration of steel jet
Controlled metal flow speed at meniscus
Less height of raised liquid steel
More heat to the meniscus
MEMS SEMS
FEMS
© ABB Process Industries AB 3BSE007679, 02-03-05, # 2
© ABB Process Industries AB 3BSE007679, 02-03-05, # 3
EMBR (ElectroMagnetic BRake)
EMBR provides necessary conditions for obtaining:
20
40
60
80 100
Distance from slab surface(mm)
(Sumimoto Metal)
© ABB Process Industries AB 3BSE007679, 02-03-05, # 7
EMBR decreases entrapped argon bubbles in the slab
Less impinging on narrow side shell
Fewer quarterband inclusions
Less waving at meniscus
Uniform molten powder film
Better melting of mould powder
Uniform shell growth in corner
Less mixing zone at grade change
Better quality in end product
Reduced mould powder
entrapment
Less surface cracks
Less break-out frequency
© ABB Process Industries AB 3BSE007679, 02-03-05, # 5
Metallurgy and products quality
• Substantial reduction of inner and subsurface inclusions.
• Virtual elimination of mould powder entrapments.
• Substantial reduction of transverse and longitudinal cracks.
© ABB Process Industries AB 3BSE007679, 02-03-05, # 1
OptimizeIT
EMBR Ruler Metallurgical results
Electromagnetic Products for Continuous Casting
EMBR / FC Mold
EMBR reduces the mixing range
Si(%) 1.0 0.8 0.6
MR without EMBR
MR with EMBR 800A
0.4
0.2
MR=Mixing range
Si(%) Si(%)
0.0
0 1 2 3 4 5 6 7 8 9 10 11 12
Slab length(m)
• Reduce dynamic and static waves at the meniscus.
• Increased meniscus temperature.
• No remelting on the narrow sides.
Production
Economy
• Possibility of achieving a wider product quality range.
EMBR reduces the steel velocity and turbulence
Fluid flow velocity (cm/s)
EMBR on
(Hoogovens 1992)
EMBR off
EMBR on
Time (min)
© ABB Process Industries AB 3BSE007679, 02-03-05, # 9
0.14
0.12 NO EMBR EMBR
0.1
N/N tot
0.08
0.06
0.04
0.02
0
0
10
20
30
40
50
60
Distance from slab surface (mm)
(Hoogovens 1997)
Baidu Nhomakorabea
© ABB Process Industries AB 3BSE007679, 02-03-05, # 8
EMBR reduce the meniscus fluctuations
%
(Hoogovens 1992)
• Increased productivity due to higher casting speed possible and a wider product quality range.
• Increase turnover and improved economy.
© ABB Process Industries AB 3BSE007679, 02-03-05, # 4
(Preussag Stahl 1994)
© ABB Process Industries AB 3BSE007679, 02-03-05, # 6
EMBR reduces alumina clusters
Al2O3 clusters
(/ 100 cm2)
3
2
1
0 0
Current
0A
1/2 Imax I max
• Reduced mixing zone at grade changes.
• Substantial improvement in product quality, resulting in decreases in material down-grading and customer rejections.
EMBR improves quality and productivity
EMBR
Less penetration of steel jet
Controlled metal flow speed at meniscus
Less height of raised liquid steel
More heat to the meniscus
MEMS SEMS
FEMS
© ABB Process Industries AB 3BSE007679, 02-03-05, # 2
© ABB Process Industries AB 3BSE007679, 02-03-05, # 3
EMBR (ElectroMagnetic BRake)
EMBR provides necessary conditions for obtaining:
20
40
60
80 100
Distance from slab surface(mm)
(Sumimoto Metal)
© ABB Process Industries AB 3BSE007679, 02-03-05, # 7
EMBR decreases entrapped argon bubbles in the slab
Less impinging on narrow side shell
Fewer quarterband inclusions
Less waving at meniscus
Uniform molten powder film
Better melting of mould powder
Uniform shell growth in corner
Less mixing zone at grade change
Better quality in end product
Reduced mould powder
entrapment
Less surface cracks
Less break-out frequency
© ABB Process Industries AB 3BSE007679, 02-03-05, # 5
Metallurgy and products quality
• Substantial reduction of inner and subsurface inclusions.
• Virtual elimination of mould powder entrapments.
• Substantial reduction of transverse and longitudinal cracks.
© ABB Process Industries AB 3BSE007679, 02-03-05, # 1
OptimizeIT
EMBR Ruler Metallurgical results
Electromagnetic Products for Continuous Casting
EMBR / FC Mold
EMBR reduces the mixing range
Si(%) 1.0 0.8 0.6
MR without EMBR
MR with EMBR 800A
0.4
0.2
MR=Mixing range
Si(%) Si(%)
0.0
0 1 2 3 4 5 6 7 8 9 10 11 12
Slab length(m)
• Reduce dynamic and static waves at the meniscus.
• Increased meniscus temperature.
• No remelting on the narrow sides.
Production
Economy
• Possibility of achieving a wider product quality range.
EMBR reduces the steel velocity and turbulence
Fluid flow velocity (cm/s)
EMBR on
(Hoogovens 1992)
EMBR off
EMBR on
Time (min)
© ABB Process Industries AB 3BSE007679, 02-03-05, # 9
0.14
0.12 NO EMBR EMBR
0.1
N/N tot
0.08
0.06
0.04
0.02
0
0
10
20
30
40
50
60
Distance from slab surface (mm)
(Hoogovens 1997)
Baidu Nhomakorabea
© ABB Process Industries AB 3BSE007679, 02-03-05, # 8
EMBR reduce the meniscus fluctuations
%
(Hoogovens 1992)
• Increased productivity due to higher casting speed possible and a wider product quality range.
• Increase turnover and improved economy.
© ABB Process Industries AB 3BSE007679, 02-03-05, # 4
(Preussag Stahl 1994)
© ABB Process Industries AB 3BSE007679, 02-03-05, # 6
EMBR reduces alumina clusters
Al2O3 clusters
(/ 100 cm2)
3
2
1
0 0
Current
0A
1/2 Imax I max