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Chromium Cr Powder CAS 7440-47-3

Item No.: Tr-Cr
Chromium powder is a silvery-white metal with a slightly dark gray color (body-centered cubic crystal system).
Particle size: 53-125um(FSSS)
Chromium Powder Properties

About Chromium Cr Powder:

Chromium is a steel-gray, lustrous, and hard metal that finds wide use as a catalyst or in alloys. Chromium is used as a hardener in steel to manufacture stainless steel and many useful alloys. It is also employed to give glass an emerald green color. Chromium does not oxidize in the air, even in extreme moisture.

What is chromium powder?

Chromium powder is a silvery-white metal with a slightly dark gray color (body-centered cubic crystal system). The chromium melting point is 1857℃. The chromium boiling point is 2672 ℃.

Chromium density D28 7.20. Soluble in dilute sulfuric acid, dilute hydrochloric acid, insoluble in water, nitric acid, aqua regia. Chromium, the chemical symbol Cr, has an atomic number of 24 and belongs to the ⅥB group in the periodic table. The element name comes from the Greek word "color," because chromium compounds have colors. The single material is steel-gray metal, the hardest metal in nature. The chromium content in the earth's crust is 0.01%, ranking the 17th. Free natural chromium is extremely rare and mainly exists in chrome-lead ore. Metal chromium powder can burn under high temperatures and open flame. It has almost no harmful effect on the human body and has not been reported to cause industrial poisoning. However, hexavalent chromium ions are carcinogenic. Packing and storage products in iron drums lined with polyethylene plastic bags should be stored in dry and clean warehouses. Not to be stored and transported together with acids. Fire can be used dry powder sand to extinguish.

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Product Information of chromium powder CAS 7440-47-3:

chromium powder Purity: 99.95% 
Copper powder Appearance: grey nanopowder
Copper powder FSSS: 53 to 125 microns
Copper powder Bulk density: 3.8 g/cm3
chromium powder COA:


Chemical Composition,ppm










































How is Chromium Cr Powder produced?

In chromium production, chromite calcium calcination is used to convert chromium trioxide into sodium chromate, which is leached into sodium chromate solution with the dilute solution and water and then manufactured by electrolysis.

Electrolysis method: when sodium chromate is used as compensation solution for electrolysis, the cathode solution is 40g/L(Cr), 90g/L (NH4); Anodic solution is 22g/L (Cr), 18g/L (NH4), 200g/ LH2S04.Chromium metal was prepared by electrolysis of stainless steel for the cathode and Pb-Ag alloy for the anode at about 60℃, cell voltage of 4.8V, and current density of 8.6A/CrR12. Due to the high content of silicon, aluminum, and other impurities in chromite and its additive, the amount of slag discharged in the process is large because it contains toxic water-soluble Cr6+, which seriously pollutes the environment.

The process developed in recent years: the chromite is first reduced by carbon into carbon ferrochrome and then oxidized by roasting and leaching with soda ash, dolomite, and other mixtures to obtain sodium chromate solution, which is reduced by sulfur and calcined to obtain chromium oxide, and then smelted, sandblasted and finished with aluminum to obtain metal chromium products. The advantage of this method is that most of the impurities in chromite enter the smelting slag, so the total chromium in the mixture can be higher, the pollution to the environment can be reduced, and the soda ash consumed in the roasting process is less. The quality of the products can be improved at the same time.

Applications of Chromium Cr Powder:

Chromium uses are very wide. Chromium powder can be light-resistant, and the heat-resistant coating can also be used as an abrasive, glass, ceramic colorant, and chemical synthesis of catalysts. Chromium alum and dichromate are tanning materials for leather, mordant, impregnating agents, and various pigments for fabric dyeing. Chromium plating and chromizing can make steel, copper, aluminum, and other metals form a corrosion-resistant surface and bright and beautiful, widely used in furniture, automobile, construction, and other industries. In addition, chrome ore is also used in large quantities to make refractory materials. Used for refining high-temperature alloy, resistance alloy, and precision alloy as an additive of chromium element. Pure chromium is used for electroplating.

Production Method of Chromium Powder :

There are two main methods for preparing chromium powder: the carbonyl method (CRO) and the ELECTROCHROM method (ELECTROCHROM). These preparation methods all involve a series of complex chemical and physical processes, and the following are detailed descriptions of the two preparation methods: 

Carbonyl method (CRO) : 

The carbonyl process is a commonly used method to prepare chromium powder, which consists of three main steps: carbonylation reaction, hydrogen reduction, and grinding. 

(1) Carbonylation reaction: In the presence of chromium oxides and carbon monoxide, a carbonylation reaction occurs to generate chromite. This reaction requires high temperature and pressure and requires the use of catalysts. 

(2) Hydrogen reduction: Under the action of hydrogen, chromite is reduced to chromium powder. This process must be carried out under high temperature and pressure conditions while maintaining a certain hydrogen pressure. 

(3) Grinding: The chromium powder must be ground and graded to obtain the required particle size and purity. Abrasives are added during the grinding process to help the grinding process. 


Electrolysis is another method of preparing chromium powder, which involves electrolysis of chloride or sulfate solution and then precipitation of chromium metal on the anode under the action of an electric field force. The advantage of this method is that it can be performed at low temperatures while producing chromium powder with high purity and high density. 

(1) Electrolytic chloride or sulfate solutions: Cr² + and Cl⁻ or SO₄²⁻ ions are produced by electrolysis of chloride or sulfate solutions under certain temperature and voltage conditions. 

(2) Chromium metal precipitation on the anode under the action of electric field forces: The Cr² + ion on the anode is reduced to chromium metal and attached to the surface of the anode. 

(3) Collection and grinding: The chromium on the anode surface is separated from the electrolyte and is ground and graded to obtain the required particle size and purity. 

In general, the carbonyl and electrolysis methods are effective methods for preparing chromium powder, and they have certain advantages and limitations in producing chromium powder. The method to choose depends on the specific parameters in the preparation process and the product's end use.

Storage Condition of chromium Cr powder:

The damp reunion will affect chromium Cr powder dispersion performance and using effects. Therefore, chromium Cr powder should be sealed in vacuum packing and stored in a cool and dry room; the chromium Cr powder can not be exposed to air. In addition, the Cr powder should be avoided under stress.

Packing & Shipping of chromium Cr powder:

We have many different kinds of packing, which depend on the chromium Cr powder quantity.

Chromium Cr powder packing: vacuum packing, 100g, 500g, or 1kg/bag, 25kg/barrel, or as you request.

Chromium Cr powder shipping: could be shipped out by sea, by air, by express, as soon as possible once payment receipt.

Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) is a trusted global chemical material supplier & manufacturer with over 12-year-experience in providing super high-quality chemicals and Nanomaterials, including boride powder, nitride powder, graphite powder, sulfide powder, 3D printing powder, etc.
If you are looking for high-quality chromium powder, please feel free to contact us and send an inquiry. ([email protected])


Chromium Powder Properties

Other Names Chromium Chips, Chromium Sheet, Chromium Flake
CAS No. 7440-47-3
Compound Formula Cr
Molecular Weight 52
Appearance Silvery
Melting Point 1857℃
Boiling Point 2672℃
Density 7.18 g/cm3
Solubility in H2O N/A
Electrical Resistivity 12.96 microhm-cm @ 0 °C
Poisson's Ratio 0.21
Tensile Strength N/A
Thermal Conductivity 0.939 W/cm/K @ 298.2 K
Thermal Expansion (25 °C) 4.9 µm·m-1·K-1
Vickers Hardness 1060 MN m-2
Young's Modulus 279 Gpa

Chromium Powder Health & Safety Information

Signal Word Warning
Hazard Statements H400
Hazard Codes N/A
Risk Codes N/A
Safety Statements N/A
Transport Information N/A
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