Chromium

CAS Number
7440-47-3
EC Number
231-157-5

What is Chromium?

Chromium (CAS 7440-47-3), also commercially referenced as Chrome, is a hard transition metal sourced primarily through ferrochrome production.

Where is Chromium used?

  • Metallurgy: alloy input for stainless and tool steels, determining corrosion resistance thresholds and mechanical performance grades
  • Surface finishing: electroplating onto metal and plastic substrates for hard, wear-resistant hardware
  • Catalysis: precursors for polymerization and dehydrogenation catalysts in petrochemical processing
  • Pigments: feedstock for chromium oxide and chromate-based colorants in coatings, ceramics and specialty inks
  • It serves automotive, aerospace and industrial components.

Commercial specifications

  • Purity from technical grade to high-purity; material exceeding 99.5% Cr for specialized needs
  • Aluminothermic and electrolytic routes yield low-iron and low-sulfur variants
  • Bulk quantities standard for metallurgical buyers; smaller packaging for catalyst and chemical synthesis

Other Names (Synonyms)

element 24|24Cr|Chrome|Chromium metal|Chrom|Chromium, elemental|Dinakrome|BioChrome

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What are the physical properties of Chromium?

Melting Point 1900 °C
Boiling Point 2642 °C
Density 7.14 g/cm³
Flash Point 50 °F
Appearance Chromium may exist in one of three valence states in compounds, , , and . The most stable oxidation state is trivalent chromium; Hexavalent chromium is a less stable state. Chromium (element) blue-white to steel-gray, lustrous, brittle, hard, odorless solid. Elemental:
Color Silver-gray
Odor Odorless
Form powder
Water Solubility Insoluble in water.
pH <1 (H2O, 20°C)

How is Chromium classified and handled safely? Learn More

Danger
GHS07· Irritant GHS08· Health Hazard GHS09· Environmental Hazard

Hazard Statements

H317 May cause an allergic skin reaction
H319 Causes serious eye irritation
H320 Causes eye irritation
H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled

Precautionary Statements

P203 Obtain, consult and follow expert instructions for use.
P233 Keep container tightly closed.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.

Which trade and regulatory codes apply to Chromium?

HS Code 8112 21 90
UN Number 2924
ADR Class 3
Packing Group II
WGK (Germany) 3
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