Copper Alloy 191 Chemical Composition & Properties, Grades, Charts and Online Pdf

Copper Alloy 191, which is known for its high electrical conductivity, high resistance to corrosion, and has typically 95.5% copper, 3.5% zinc, and 0.5% elements of tin, makes up most of the alloy. Due to this pattern, the material becomes an excellent one which is suitable when machining and soldering also. It has been adopted widely in devices made for maintenance of electricity when brothered with its superb conductivity and durability. Its machinability and electrical conductivity are displayed in the grade charts such as strain, modulus, and thermal conductivity. The online PDFs usually provide full details on the chemical composition, physical appearance, and the existing standard values. This will help engineers and manufacturers to select the proper type of material for their products during design. Knowing these properties and grades is very important for the improvements of the performance and reliability in many electrical and electronic uses.

Copper Alloy 191 Chemical Composition And Grade Table

Copper alloy 191 which is often referred to C191 is a copper alloy with both the highest strength and conductivity. Its chemical composition is usually based on copper (Cu) as the main component and minimal additions of aluminum (Al) and iron (Fe) to increase strength and electric conductivity. In the case of Grade C191, the table specifies the relate less to the chemical composition of the alloy but, rather, to its mechanical properties, and applicable area. The reason for this is that copper has a very high electrical conductivity and this makes it applicable in electric components where both strength and electrical conductivity are of great significance. Its accurate and specific chemical composition combined with grade specifications contributes to the fullfillment of a wide range of industrial or electricity ones.

Copper Alloy 191 Composition Table
Elements Cr Ni Cu C Mn Si P S Fe Al
Min (%) - 13.50 - - 3.50 - - - 0.70 1.00
Max (%) 0.50 16.50 Balance 0.05 5.50 0.15 0.010 0.150 1.20 2.00

The Advantages and Disadvantages of Copper Alloy 191


  • High Strength: Copper alloy 191 consists of good tensile strength as well as high mechanical properties and hence, is applicable to aerospace and automotive industries.

  • Corrosion Resistance: This alloy has corrosion resistance property, especially in marine environment, so it is good for equipment and structure for sea bed.

  • Thermal Conductivity: Copper Alloy 191 is a very good thermal conductive medium. It facilitates the process of heat transfer which normally comes handy in heat exchangers and other thermal systems management.

  • Electrical Conductivity: This alloy has high electrical conductivity, making it very common in electrical components and conductors, contributing to the smooth electrical transmission.

  • Machinability: Copper Alloy 191 is machineable and fabricable which makes it suitable for fabrication of complicated shapes and dimensions excellently.


  • Cost: Copper Alloy 191 is indeed more costly than most existing alternatives, hence its adoption in cost-effective applications is limited.

  • Weight: Copper is a metal with high density, making the parts heavier than alternatives like aluminum alloys, which may not work for sensitive applications that require less weight.

  • Oxidation: Copper alloy 191 is subject to get oxidized or tarnished over time, and this can affect its appearance that may require additional maintenance.

  • Work Hardening: Copper Alloy 191 can resist deformation by work hardening when processed and shaped. This may require heat treatments such as annealing to restore its desirable properties.

  • Compatibility Concerns: Copper Alloy 191 might not be the best for some material and environments because some materials could react with the copper resulting in compatibility problems; therefore the selection of material needs to be done with extra care.

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Frequently Asked Questions

What is the chemical composition of copper alloy 191?

Copper Alloy 191 has Cu as the main element, and Fe, Al, and Ni among others are added to improve its features.

What are the characteristics of Copper Alloy 191?

Copper Alloy 191 has very high tensile strength, highest corrosion resistance, good thermal and electrical conductivity, and really easy to machine. These qualities make it applicable to diverse industries such as aerospace, marine, and electrical.

Is there more than one grade of the Copper Alloy 191 available?

Copper Alloy 191 is normally specified by industry standards like ASTM B187 or AMS 4596, which describe in detail the chemical composition, mechanical properties and manufacturing processes to meet standards of quality and consistency.

What is one of the industrial uses of Copper Alloy 191?

Copper Alloy 191 is a very versatile alloy which finds application in many industries, such as aerospace for structural parts and fasteners, and marine for corrosion resistant equipment; electrical industry for conductors and connectors; and automotive for bushings and bearings.