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Steel Melting and Holding

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SFR recommend three types of lining materials for melting steel alloys: 

1.STEEL-RAM® corundum spinel neutral ramming material:

Neutral material, low crack propensity;

The hot surface forms a dense sintered layer of high-strength aluminum-magnesium spinel at high temperature;

The sintered layer can effectively prevent the penetration of high temperature metals, manganese oxide and iron oxide;

The unique design of the product allows the backing to maintain a good loose layer and improve the safety of the whole lining.

The main component of the STEEL-RAM® series is alumina, added with a certain proportion of magnesium oxide and then reacts at high temperatures to form magnesium-aluminum spinel which gives the material excellent volume stability and high resistance to erosion.

2. STEEL-RAM® corundum spinel neutral ramming material contains chrome oxide:

This series is based on fused corundum, added with chromium oxide, the fused corundum, magnesia and chrome oxide form a composite spinel with high corrosion resistance, forming a dense sintered layer under high temperature environment, and having excellent resistance to molten steel erosion while maintaining a good loose layer on the backing which improves the safety of the lining.

3.MAG-RAM® magnesium oxide based ramming material:

Magnesium oxide based materials have excellent resistance to alkaline slag-based metal erosion, but they are generally used in small coreless furnaces (<1000kg) or in heavy chemical attack working conditions due to their volume stability are not as good as alumina-based materials. MAG-RAM® series are mainly composed of magnesium oxide, and a certain proportion of alumina is added in order to form magnesium aluminum spinel under high temperature reaction. This series of materials not only maintains the high corrosion resistance, but also it can reduce the cracking and spalling risk of the lining compared with ordinary magnesium oxide materials.

 
materials
 
 
materials

SFR-PLUGS porous plug brick is designed to inject inert gas into the chamber of coreless induction furnace. This permeable brick is made of refractory material, its uniquely design can prevent penetration of molten metal but allow the venting of gas.

SFR-PLUGS bricks help to homogenize the temperature and chemical composition of the molten metal, and also help to make the slag float to the molten metal surface.

Advantages of using SFR-PLUGS bricks:

Reduce the gas content in the molten metal;

Reduce the temperature difference in the furnace;

Reduce the slag inclusion in the molten metal;

Improve the service life of the lining.
 
No. Location
Product Name 
Product 
Description 
Al₂O₃
%
SiO₂
%
MgO
%
Cr₂O₃
%
CaO
%
 B.D. 
g/cm³
Max.
Temp.℃
1 Cover ULTRA-CAST 200
Alumina Based Castable
45.0 50.0     2.0 2.30 1650
2
Spout
ALU-PAK® 73CR
Alumina Based Plastic
75.0 9.0   4.0   2.85 1750
ALU-PAK® 79CR
Alumina Based Plastic
76.5 9.0   8.0   2.95 1750
ALU-PAK® 90
Bauxite Based Plastic
89.0 5.0       2.85 1750
3
Upper Ring
ULTRA-FLO 85
Alumina Based Castable
84.0 12.0     2.0 2.85 1800
ULTRA-FLO 60
Mullite Based Castable
63.0 30.0     1.5 2.50 1700
4 GROUT COIL CRETE 390
 White Alumina Based Grout
85.0 6.0     5.0 2.60 1760
COIL CRETE 590 Red Alumina Based Grout 91.0 2.0     5.0 2.80 1760
5
Patching 
material
ALU-PAK® 73CP Alumina Based Plastic 75.0 9.0   4.0   2.85 1750
ALU-PAK® 79CR
Alumina Based Plastic
76.5 9.0   8.0   2.95 1750
6
Work lining 
STEEL-RAM 89 Corundum Based Dry-Ramming 88.0   11.0     3.15 1850
STEEL-RAM 91 Corundum Based Dry-Ramming 67.0   32.0     2.95 1850
STEEL-RAM 92 Corundum Based Dry-Ramming 84.5   15.0     3.10 1850
STEEL-RAM 92H
Corundum Based Dry-Ramming
84.5   15.0     3.10 1800
STEEL-RAM 80CR
Corundum Based Dry-Ramming
with Chrome Addition
80.0   14.0 5.0   3.15 1800
MAG-RAM 65
Magnesia Based Dry-Ramming
22.0   75.0     3.05 1800
MAG-RAM 95
Magnesia Based Dry-Ramming
  1.0 96.5     2.90 1800
MAG-RAM 96
Magnesia Based Dry-Ramming
  0.8 97.0     2.85 1800
SIL-RAM169CR
Silica Based Dry-Ramming
with Chrome Addition
  97.5   1.0   2.20 1700
7
push out blocks 
ULTRA-FLO 85
Alumina Based Castable
84.00 12.00     2.0 2.85 1800
8
slip plane
SFR-MICA
0.3mm thickness Mica Paper
            900

 

Corresponding parameter set not found, please add it in property template of background
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