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Chromium Metal
Chromium is widely used for alloying steel and its alloys to give them
corrosion and heat resistance. The most famous ball-bearing steels
(about 1% Cr and 1% C), stainless steels (18% Cr and 8-10% Ni),
resistance alloys - nichromes (60-80% Ni, 15-20% Cr) and heat
resistance alloys (13-16% Cr) based on iron, nickel and cobalt.
The practical experience shows that the addition of chrome to steel leads
to the following:
- reduced grain size
- increased hardenability
- improved hardness and strength
- improved ductility when chrome contents <1 %
- low influence on oxidation resistance at high temperatures
- improved strength at high temperatures
The presence of chromium in carbon steels improves their hardness and wear resistance.
Chromium alloyed cast irons are widely used.
High-temperature steels and alloys containing 13-60% Cr are
used for making gas turbines and jet engines.
Chrome plating of metal products, i.e. electrochemical coating
by a thin film of chromium, leads to their improved durability and service life.
Chemical composition
| Grade |
Chemical composition, % |
| Cr |
Si |
Al |
Fe |
C |
S |
P |
Cu |
| min |
max |
| X99H1 |
99,0 |
0,2 |
0,5 |
0,5 |
0,01 |
0,02 |
0,005 |
0,005 |
| X99H2 |
99,0 |
0,2 |
0,2 |
0,5 |
0,03 |
0,02 |
0,01 |
0,008 |
| X99H4 |
99,0 |
0,2 |
0,3 |
0,5 |
0,03 |
0,02 |
0,02 |
0,01 |
| X99H5 |
99,0 |
0,2 |
0,5 |
0,5 |
0,03 |
0,02 |
0,02 |
0,01 |
| X99 |
99,0 |
0,2 |
0,5 |
0,5 |
0,03 |
0,02 |
0,02 |
0,02 |
| X98.5 |
98,5 |
0,4 |
0,7 |
0,6 |
0,03 |
0,02 |
0,02 |
0,02 |
|
| Grade |
Chemical composition, % |
| As |
Bi |
Sb |
Zn |
Pb |
Sn |
Co |
N |
| не более |
| X99H1 |
0,01 |
0,0004 |
0,002 |
0,005 |
0,0005 |
0,004 |
- |
0,01 |
| X99H2 |
0,01 |
0,0005 |
0,006 |
0,006 |
0,0008 |
0,004 |
0,005 |
0,02 |
| X99H4 |
0,01 |
0,0005 |
0,008 |
0,006 |
0,0008 |
0,004 |
0,005 |
0,04 |
| X99H5 |
0,01 |
0,0005 |
0,008 |
0,006 |
0,0008 |
0,004 |
- |
0,05 |
| X99 |
0,01 |
0,0005 |
0,008 |
0,01 |
0,001 |
0,004 |
- |
- |
| X98.5 |
0,01 |
0,0005 |
0,008 |
0,01 |
0,001 |
0,004 |
- |
- |
|
Chrome is crushed to lumps of not more than 10 kg.
The amount of fines passing through the sieve with mesh dimensions 10x10 mm,
does not exceed 10% of the batch mass.
Supplied in steel drums of 300 kg each.
The surface of the lumps has no distinct inclusions of slag,
refractory materials and other foreign matter.
Density 7,53 g/cm3; melting point 1830-1870°C
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