Chromium (CAS 7440-47-3) — formula Cr, molecular weight 51.996; category inorganic chemicals.
Documented applications: Uses: The metal chromium is used mainly for making steel and other alloys., MINING, SMELTING, OR METALLURGY: Ore mining and crushing operations, Alloy production, Produce chromates from chromite, MANUFACTURING: Textile dyes, Paint pigments, Chrome plating, Leather tanning, Printing inks and toners, Photoengraving, Automotive & aircraft parts, Joint prostheses, Refractory bricks & kilns, USING: Heat or machine chromium alloys, Arc weld stainless steel, Spray paint Cr pigments, Mix and lay cement or concrete, Use water system corrosion inhibitors, wood preservatives, or glassware-cleansing solutions, Use hexavalent chromates in hardeners for epoxy resin sealants, Chromium(VI) is present also as an impurity in Portland cement, and can be generated and given off during casting, welding, and cutting operations involving stainless steel, even if chromium was not originally present in its hexavalent state. [ACGIH] Stainless steels are a group of iron-based alloys containing at least 10.5% chromium. Chromium is used to make stainless steel corrosion resistant. . . . In ferrochromium operations, trivalent (insoluble) chromium (Cr3+) predominates, but hexavalent (soluble) chromium (Cr6+) also occurs at low levels, usually at below 1 ug m-3. [PMID 26950803], Steel Producing [Category: Industry], Abrasive Blasting [Category: Clean], Metal Preparation and Pouring [Category: Foundry], Metal Machining [Category: Heat or Machine], Welding [Category: Weld], Electroplating [Category: Plate], Metal Thermal Spraying [Category: Plate], Semiconductor Manufacturing [Category: Industry], Smelting Copper or Lead [Category: Industry], Pulp and Paper Processing [Category: Industry], Painting (Pigments, Binders, and Biocides) [Category: Paint], Applying Wood Preservatives [Category: Other], Mining [Category: Industry], Plastic Composites Manufacturing [Category: Industry], Cleaning Furnaces or Flues [Category: Clean], Leather Tanning and Processing [Category: Industry], Photographic Processing [Category: Other], Fur Dressing and Dyeing [Category: Industry], Cement Producing [Category: Industry], Textiles (Printing, Dyeing, or Finishing) [Category: Industry], Welding Over Coatings [Category: Weld], Silk-Screen Printing [Category: Other], Glass Manufacturing [Category: Industry], Metal Extraction and Refining [Category: Industry], Ceramics making [Category: Hobbies], Enameling [Category: Hobbies], Painting [Category: Hobbies], Glassblowing [Category: Hobbies], Textile arts [Category: Hobbies], Lithography printing [Category: Hobbies], Smoking cigarettes [Category: Food & Drugs], Living near chromium plating or chromate plant [Category: Environments], In maufacturing of chrome-steel or chrome-nickel-steel alloys (stainless steel), nonferrous alloys, heat resistant bricks for refractory furnaces. To greatly increase strength, hardness and resistance of metals to abrasion, corrosion and oxidation. For chrome plating of other metals, leather tanning, as pigment and mordant, wood preservative. Use of (51)Cr as diagnostic aid., Alloying and plating element on metal and plastic substrates for corrosion resistance, chromium-containing and stainless steels, protective coating for automotive and equipment accessories, nuclear and high temperature research, constituent of inorganic pigments., Cobalt-chromium stellite alloys (extrusion dies, turbine blades, valve seats), cobalt-chromium tungsten alloys (cemented carbide cutting tools), nickel chromium alloys (jet engine parts, electrical heating elements)., Forms heat-treatable copper alloys., For more Uses (Complete) data for CHROMIUM, ELEMENTAL (10 total), please visit the HSDB record page., Substance listed with specific concentration in tattoo ink and, or permanent make up according to EU Commission Regulation 2020, 2081. The concentration limit (by weight) is 0.00005%., Elemental chromium is used mainly for making steel. Hexavalent chromium is used for chrome plating, dyes and pigments, and wood preserving. (A12, L17), Use Classification: Chemical Classes -> Inorganic substances, Industry Uses: Intermediate, Filler, Not Known or Reasonably Ascertainable, Chemical reaction regulator, Other, Alloys, Anti-adhesive, cohesive, Consumer Uses: Chemical reaction regulator, Pigment, Other (specify), Household Products: Cosmetics product ingredient: Chromium and chromium compounds, Product count: 1, Information on 1 consumer products that contain Chromium in the following categories is provided:, • Auto Products, Methods of Manufacturing: Chromium metal is commercially produced in the United States by the reduction of chromite ore with carbon, aluminum, or silicon, and subsequent purification., Chromium is extracted from its ores by alkaline or acidic dissolution. In alkali dissolution, finely ground chrome ore is roasted with Na2CO3 under oxidizing conditions at ca. 1100 °C. The sodium chromate is leached from the calcine, most of the gangue is insoluble. The solution containing hexavalent Cr can be reduced with SO2 and used for electrowinning, or Na2Cr2O7 can be crystallized from it. The Na2Cr2O7 can be converted to CrO3 for use in electrolysis or to Cr2O3 for use in metallothermics. Chrome ore can be dissolved in acid if an oxidizing agent is present. However, Fe, Al, and Mg also dissolve and must be removed. The preferred acidic dissolution technique is to reduce the ore with carbon, forming ferrochromium, which is ground and dissolved in sulfuric acid. The only significant impurity carried over is Fe, which is removed by crystallization as iron(II) ammonium sulfate. The Cr in the solution is in the +3 valence state and with additional purification is used to produce electrolytic Cr., Chromium metal is produced by the reduction of Cr2O3 or the electrolysis of Cr(III) solutions. The metal can also be obtained from Cr(VI) solutions by electrolysis, but the process is less efficient and is used primarily for.
Chromium is an inorganic compound with CAS registry number 7440-47-3 and molecular formula Cr (molecular weight 51.996), belonging to the inorganic chemicals segment of chemical raw materials.
CAS number: 7440-47-3
Its molecular formula Cr comprises 1 Cr atom.
Also known as: Chromium · Chromium(III) atomic absorption standard solution · Chrome
Category: inorganic chemicals
The CAS registry number of Chromium is 7440-47-3.
Molecular formula Cr, molecular weight 51.996.
It is also registered under: Chromium, Chromium(III) atomic absorption standard solution, Chrome.
Recorded applications: Uses: The metal chromium is used mainly for making steel and other alloys., MINING, SMELTING, OR METALLURGY: Ore mining and crushing operations, Alloy production, Produce chromates from chromite, MANUFACTURING: Textile dyes, Paint pigments, Chrome plating, Leather tanning, Printing inks and toners, Photoengraving, Automotive & aircraft parts, Joint prostheses, Refractory bricks & kilns, USING: Heat or machine chromium alloys, Arc weld stainless steel, Spray paint Cr pigments, Mix and lay cement or concrete, Use water system corrosion inhibitors, wood preservatives, or glassware-cleansing solutions, Use hexavalent chromates in hardeners for epoxy resin sealants, Chromium(VI) is present also as an impurity in Portland cement, and can be generated and given off during casting, welding, and cutting operations involving stainless steel, even if chromium was not originally present in its hexavalent state. [ACGIH] Stainless steels are a group of iron-based alloys containing at least 10.5% chromium. Chromium is used to make stainless steel corrosion resistant. . . . In ferrochromium operations, trivalent (insoluble) chromium (Cr3+) predominates, but hexavalent (soluble) chromium (Cr6+) also occurs at low levels, usually at below 1 ug m-3. [PMID 26950803], Steel Producing [Category: Industry], Abrasive Blasting [Category: Clean], Metal Preparation and Pouring [Category: Foundry], Metal Machining [Category: Heat or Machine], Welding [Category: Weld], Electroplating [Category: Plate], Metal Thermal Spraying [Category: Plate], Semiconductor Manufacturing [Category: Industry], Smelting Copper or Lead [Category: Industry], Pulp and Paper Processing [Category: Industry], Painting (Pigments, Binders, and Biocides) [Category: Paint], Applying Wood Preservatives [Category: Other], Mining [Category: Industry], Plastic Composites Manufacturing [Category: Industry], Cleaning Furnaces or Flues [Category: Clean], Leather Tanning and Processing [Category: Industry], Photographic Processing [Category: Other], Fur Dressing and Dyeing [Category: Industry], Cement Producing [Category: Industry], Textiles (Printing, Dyeing, or Finishing) [Category: Industry], Welding Over Coatings [Category: Weld], Silk-Screen Printing [Category: Other], Glass Manufacturing [Category: Industry], Metal Extraction and Refining [Category: Industry], Ceramics making [Category: Hobbies], Enameling [Category: Hobbies], Painting [Category: Hobbies], Glassblowing [Category: Hobbies], Textile arts [Category: Hobbies], Lithography printing [Category: Hobbies], Smoking cigarettes [Category: Food & Drugs], Living near chromium plating or chromate plant [Category: Environments], In maufacturing of chrome-steel or chrome-nickel-steel alloys (stainless steel), nonferrous alloys, heat resistant bricks for refractory furnaces. To greatly increase strength, hardness and resistance of metals to abrasion, corrosion and oxidation. For chrome plating of other metals, leather tanning, as pigment and mordant, wood preservative. Use of (51)Cr as diagnostic aid., Alloying and plating element on metal and plastic substrates for corrosion resistance, chromium-containing and stainless steels, protective coating for automotive and equipment accessories, nuclear and high temperature research, constituent of inorganic pigments., Cobalt-chromium stellite alloys (extrusion dies, turbine blades, valve seats), cobalt-chromium tungsten alloys (cemented carbide cutting tools), nickel chromium alloys (jet engine parts, electrical heating elements)., Forms heat-treatable copper alloys., For more Uses (Complete) data for CHROMIUM, ELEMENTAL (10 total), please visit the HSDB record page., Substance listed with specific concentration in tattoo ink and, or permanent make up according to EU Commission Regulation 2020, 2081. The concentration limit (by weight) is 0.00005%., Elemental chromium is used mainly for making steel. Hexavalent chromium is used for chrome plating, dyes and pigments, and wood preserving. (A12, L17), Use Classification: Chemical Classes -> Inorganic substances, Industry Uses: Intermediate, Filler, Not Known or Reasonably Ascertainable, Chemical reaction regulator, Other, Alloys, Anti-adhesive, cohesive, Consumer Uses: Chemical reaction regulator, Pigment, Other (specify), Household Products: Cosmetics product ingredient: Chromium and chromium compounds, Product count: 1, Information on 1 consumer products that contain Chromium in the following categories is provided:, • Auto Products, Methods of Manufacturing: Chromium metal is commercially produced in the United States by the reduction of chromite ore with carbon, aluminum, or silicon, and subsequent purification., Chromium is extracted from its ores by alkaline or acidic dissolution. In alkali dissolution, finely ground chrome ore is roasted with Na2CO3 under oxidizing conditions at ca. 1100 °C. The sodium chromate is leached from the calcine, most of the gangue is insoluble. The solution containing hexavalent Cr can be reduced with SO2 and used for electrowinning, or Na2Cr2O7 can be crystallized from it. The Na2Cr2O7 can be converted to CrO3 for use in electrolysis or to Cr2O3 for use in metallothermics. Chrome ore can be dissolved in acid if an oxidizing agent is present. However, Fe, Al, and Mg also dissolve and must be removed. The preferred acidic dissolution technique is to reduce the ore with carbon, forming ferrochromium, which is ground and dissolved in sulfuric acid. The only significant impurity carried over is Fe, which is removed by crystallization as iron(II) ammonium sulfate. The Cr in the solution is in the +3 valence state and with additional purification is used to produce electrolytic Cr., Chromium metal is produced by the reduction of Cr2O3 or the electrolysis of Cr(III) solutions. The metal can also be obtained from Cr(VI) solutions by electrolysis, but the process is less efficient and is used primarily for.
Category: Inorganic Chemicals.
Public-database records for Chromium (CAS 7440-47-3), reproduced here for independent cross-checking.
| GHS notification summary | 50% (1202 / 2404) |
|---|---|
| Reported hazard statements | H317 (20.7%), H319 (19.1%), H334 (20.3%), H335, H320, H341, H371, H400 |
This chemical does not meet GHS hazard criteria for 50% (1202 of 2404) of reports.
H317 (20.7%): May cause an allergic skin reaction [Warning Sensitization, Skin]
| Regulatory & Food Contact | CIR / INCI: Cosmetics ingredient -> Other (Specify) |
|---|---|
| GHS notification summary | 50% (1202 / 2404) |
| 沸点 | 4788 °F at 760 mmHg (NTP, 1992) |
|---|---|
| 沸点 | 2642 |
| 沸点 | 4788 ° F |
| 沸点 | 2642 °C |
| 沸点 | 4788 °F |
| 沸点 | 2671 °C @760 [mm Hg] |
| 熔点 | 3452 °F (NTP, 1992) |
| 熔点 | 1900 |
| 熔点 | 3452 °F |
| 熔点 | 1907 °C |
| CAS Registry Number | 7440-47-3 |
|---|---|
| PubChem CID | 23976 |
| 分子式 | Cr |
| IUPAC 名称 | chromium |
| UNII（FDA） | 0R0008Q3JB |
CHROMIUM; 7440-47-3; Chrome; Chromium metal; Chrom; Chromium, elemental; Dinakrome; BioChrome; DTXSID3031022; CHEBI:28073; 0R0008Q3JB; Dietary Chromium; Chromium Metallicum; RefChem:5683; lambda6-chromium(6+) ion; DTXCID1011022
| 分子量 | 51.996 |
|---|---|
| 氢键供体数 | 0 |
| 氢键受体数 | 0 |
| 可旋转键数 | 0 |
| 精确质量 | 51.940505 |
| 单同位素质量 | 51.940505 |
| 拓扑极性表面积 | 0 |
| 重原子数 | 1 |
| 形式电荷 | 0 |
| 复杂度 | 0 |
Chrome · CAS 7440-47-3 · Cr. UNII 0R0008Q3JB. 沸点: 4788 °F at 760 mmHg (NTP, 1992); 沸点: 2642; 沸点: 4788 ° F.
Source: PubChem / Wikidata; the batch COA governs where values differ.
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