Chromium in Ferrous Metals

Silver-white metal, hard and brittle. Density 7.20 g/cm 3. Melting point 1857±20℃, boiling point 2672℃. Valence +2, +3 and +6. The ionization energy is 6.766 electron volts. Chromium metal is generally characterized by surface passivation in acids. Once depassivated, it is easily dissolved in almost all inorganic acids, but insoluble in nitric acid. Chromium is soluble in sulfuric acid, but insoluble in nitric acid. It is oxidized by water vapor at high temperatures and by carbon monoxide at 1000 ° C. At high temperatures, chromium reacts with nitrogen and is eroded by molten alkali metals. Soluble in strong alkali solution. Chromium has a high corrosion resistance, and oxidation is slow in air, even in a state of red heat. Insoluble in water. The introduction of the "Steel industry Development Policy" is a major event in the development of China's steel industry, which will play an important guiding role in the future development of China's steel industry, and is an important cornerstone for promoting the healthy development of the steel industry.

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Product Introduction

Products Description

Chromium is used in stainless steel, auto parts, tools, tapes and videotapes. Chromium plated on the metal can prevent rust, also called can be more meters, strong and beautiful. Chromium can be used to make stainless steel. The color of red and emerald also comes from chromium. As the most important metal in modern technology, chrome-nickel steel fused in different percentages is incredibly varied and diverse. The toxicity of chromium is related to its valence state, hexavalent chromium is 100 times more toxic than trivalent chromium, and is easily absorbed by the human body and accumulates in the body, and trivalent and hexavalent chromium can be converted to each other. Natural water does not contain chromium; The average concentration of chromium in seawater was 0.05ug/l. It is lower in drinking water. The sources of chromium pollution are sewage discharged from the processing of chromium-containing ore, metal surface treatment, leather tanning, printing and dyeing.

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►Physiological function of chromium

The chromite mainly exists in nature in the form of FeCr2O4. Reduced from chromium oxide with aluminum, or prepared by electrolysis from chromic alum or chromic acid. Chromium is one of the more widely distributed elements in the Earth's crust. It has more cobalt, nickel, molybdenum, and tungsten than was found before it. This may be because the natural compounds of chromium are very stable, not soluble in water, and it is difficult to reduce. It has been suggested that the metallic chromium obtained by Vaucland may be chromium carbide.

Chromium is an essential trace element in human body, which plays a special role in the metabolism of sugar and lipid in the body. Trivalent chromium is a beneficial element to the human body, while hexavalent chromium is toxic. The absorption and utilization rate of inorganic chromium by human body is very low, less than 1%; The utilization rate of organic chromium by the human body can reach 10-25%. The content of chromium in natural foods is low, and it exists in the form of trivalent.

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►use

chromium
nature	Silver-white, the hardest metal, not easily corroded.
use	Necessary metal for electroplating
product	Mode of production	nature	use
Chromium steel	Chromium was added to the steel	Hard and corrosion-resistant	Manufacturing machinery, gun barrels, tanks, armored vehicles.
Stainless steel	In steelmaking, chromium accounting for more than 12% of the total is added, and a certain amount of nickel is added.	Resistant to rust	Building materials, cutlery

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Carbon Ferrochrome

Ferrochromium 65