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Iron Melting and Holding

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Quartz based acid materials are recommended as working linings:

For the quartz lining, the transformation of the quartz crystal during the heating process causes a rapid change in volume, which makes the lining material tighter and obtains a well-sintered lining.

The transition process of quartz is irreversible, but the volume of the lining after sintering is relatively stable even the temperature changes. Familiarity with the crystallographic properties of quartz is beneficial for obtaining excellent lining service life and formulating sintering and cold-start technology.

 

Quartz crystallographic diagram:

耐热材料

In order to improve the service life of the lining, SFR recommends customers to use fused quartz lining materials.

Mainly utilize the following characteristics of fused quartz:

Nearly zero thermal expansion rate.

Excellent thermal stability

High purity (high SiO2 content, low content of iron, potassium, sodium, titanium, etc.)

Stable chemical properties.

Special mechanical control, stable particle size distribution.

Appearance: colorless transparent block, granule or white powder.

 

Lining materials for melting and holding iron:

SIL-RAM 161 is a common quartz-based material, and the binder of B2O3 (0.6%, 0.8%, 1.0%, 1.2%, etc.) can be selected according to the tapping temperature and other melting parameters;

SIL-RAM 162/SIL-RAM 163/SIL-RAM167 are acid lining material containing fused quartz. they have excellent volume stability and anti-erosion ability. they can be applied as the entire lining material or used with ordinary quartz materials. Fused quartz material can improve the problem of excessive erosion of the lower part of the lining, and also can reduce the crack and peel off risks at the upper part of the lining;

SIL-RAM 165CR is an acid lining material containing both fused quartz and chrome oxide. It has excellent volume stability, and chrome oxide improves the anti-erosion ability of the material. The service life is superior to the acid material produced by domestic and foreign manufacturers.

SIL-RAM 169CR is an acid lining material added with chromium oxide. The addition of chromium oxide improves the corrosion resistance of the material. It is usually used in the coreless induction furnace for melting iron at high temperature or high-carbon steel.

No. Location Product Name Product Description Al₂O₃
%
SiO₂
%
Cr₂O₃
%
CaO
%
Bulk
Density
g/cm³
Max.App.
Temp.℃
1 cover ULTRA-CAST 200 Alumina Based Castable 45.0 50.0   2.0 2.30 1650
2 Spout ALU-PAK® 55
Alumina Based Plastic
61.0 32.0     2.55 1680
ALU-PAK® 67
Alumina Based Plastic
68.0 26.0     2.65 1700
ALU-PAK® 85 Bauxite Based Plastic 85.0 8.5     2.65 1650
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-SEAL 68
Alumina Based Plaster
68.0 26.0     2.65 1650
ALU-PAK® 73CR
Bauxite Based Plastic
75.0 9.0 4.0   2.85 1750
6 Work lining SIL-RAM 161
Silica Based Dry-Ramming
  98.2     2.15 1650
SIL-RAM 162 Fused Silica Based Dry-Ramming   98.2     1.98 1650
SIL-RAM 163 Fused Silica Based Dry-Ramming   98.2     1.90 1650
SIL-RAM 167 Fused Silica Based Dry-Ramming   98.2     1.98 1700
SIL-RAM165CR
Fused Silica Based Dry-Ramming
with Chrome Addition
  98.2 1.0   2.15 1700
SIL-RAM169CR
Fused 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     2.85 1800
8
slip plane
SFR-MICA 0.3 mm thick mica paper           900

 

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