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Ferrochromium
Iron alloy with chromium and iron as the main components. Is one of the main alloying agents used in the steel industry, in addition to the main components of chromium and iron also contains carbon, silicon, sulfur, phosphorus and other impurities. Ferrochrome contains 55% to 75% chromium, according to the carbon content is divided into high carbon (4% to 10% C), medium carbon (0.5% to 4% C), low carbon (> 0.15% to 0.5% C) and micro carbon (≤ 0.15% C) ferrochrome.
Description
|
Plate |
Content of Elements | |||||||||
|
Cr |
C |
Si | P | S | ||||||
| Range | a | b | a | b | a | b | a |
b |
||
|
FeCr69C0.03 |
63.0-75.0 | 0.03 | 1.0 | 0.03 | 0.25 | |||||
|
FeCr69C0.06 |
63.0-75.0 | 0.06 | 1.0 | 0.03 | 0.25 | |||||
|
FeCr55C0.10 |
60.0 | 52.0 | 0.10 | 1.5 | 2.0 | 0.04 | 0.06 | 0.23 | ||
| FeCr69C0.15 | 63.0-75.0 | 0.15 | 1.0 | 0.03 | 0.25 |
|
||||
| FeCr69C0.25 | 63.0-75.0 | 0.25 | 1.0 | 0.03 | 0.25 |
|
||||
| FeCr55C10 | 60.0 | 52.0 | 10.0 | 1.5 | 5.0 | 0.04 | 0.06 | 0.04 |
0.06 |
|
Chromium added to steel significantly improves its oxidation resistance and increases its corrosion resistance. Chromium is contained in many steels with special physico-chemical properties. Chromium in steel is added with ferrochrome. High-carbon ferrochrome is used as an alloying agent in ball-bearing steels (0.5% to 1.45% Cr), tool steels, mould steels (5% to 12% Cr) and high-speed steels (3.8% to 4.4% Cr) to improve the hardenability of the steel and increase its wear resistance and hardness. Adding chromium to cast iron can increase hardness and improve wear resistance, containing 0.5% to 1.0% chromium can improve its mechanical properties. High-carbon ferrochrome and charge-grade ferrochrome are used in large quantities as charge for smelting stainless steel (AOD or VOD method) to reduce production costs. Medium and low carbon ferrochrome is used in the production of medium and low carbon structural steel, carburised steel, the manufacture of gears, high pressure blower blades, valve plates and so on. Microcarbon ferrochrome is used in the production of stainless steel, acid-resistant steel, heat-resistant steel and electric heating alloy.
