ThePipingMart Blog Grades C120 Copper (UNS C12000) – Composition, Properties, and Uses

C120 Copper (UNS C12000) – Composition, Properties, and Uses

Copper C120

UNS C12000 is a copper alloy that is composed of copper, iron, and manganese. This alloy has excellent mechanical properties and is used in a variety of applications due to its corrosion resistance, heat resistance, and machinability. It’s also relatively easy to weld, making it a versatile material for many industries. Let’s take a closer look at the composition, properties, uses, corrosion resistance, heat resistance, heat treatment, and machining of Copper C120.

C120 Copper Composition

UNS C12000 is composed of 99% copper with small amounts of iron (0.4%) and manganese (0.2%). The mechanical properties are excellent; the tensile strength ranges from 25 ksi to 35 ksi, and the yield strength ranges from 15 ksi to 25 ksi after cold working. The electrical conductivity is relatively high at 17-21% IACS.

Nominal Minimum Maxiumum
Copper 99.90
Phosphorus .004-.012

C120 Copper Chemical Properties

UNS C12000 is a great choice when looking for a specific set of chemical properties. It has excellent electrical and thermal conductivity, as well as superior formability and corrosion resistance. It also shows good strength characteristics when put under pressure, making it ideal for applications that require such features. It is easy to work with due to its malleability; sheet Copper C120 can be cut and shaped into many different forms without sacrificing any of its properties. Its resistance to oxidation ensures a long-lasting lifespan and makes copper C120 suitable for outdoor applications where it could possibly be exposed to moisture or extreme temperatures. All in all, this alloy is an excellent choice for those looking for strong chemical properties in their application.

C120 Copper Mechanical Properties

UNS C12000 is a type of copper grade whose properties have made it attractive for both industrial and residential applications. Not only is it highly resistant to corrosion due to its 98% minimum copper content, but it has excellent ductility and tensile strength at room temperature, which makes it especially suitable for manufacturing processes that require precision welding. Additionally, its high electrical conductivity makes it a primary choice for power transmission components and electrical connectors. The thermal stability of this type of copper also has others benefits like enhanced fire safety protection during hot working operations. It’s no wonder why many manufacturers rely on the dependability of Copper C120 to keep their production lines running smoothly in an ever-increasing competitive market.

Size Section Temper Tensile Strength psi Yield Strength (.5% Extension Under Load) psi Reduction of Area % Elongation in 2” % Rockwell Hardness Shear Stength psi Fatigue Strength
F B 30T psi Million Cycles
Flat Products
0.040 in. 0.050 mm 32,000 10,000 45 40 22,000
0.025 mm 34,000 11,000 45 45 23,000 11,000 100
Eighth Hard 36,000 28,000 30 60 10 25 25,000
Quarter Hard 38,000 30,000 25 70 25 36 25,000
Half Hard 42,000 36,000 14 84 40 50 26,000 13,000 100
Hard 50,000 45,000 6 90 50 57 28,000 13,000 100
Spring 55,000 50,000 4 94 60 63 29,000 14,000 100
Extra Spring 57,000 53,000 4 95 62 64 29,000
As Hot Rolled 34,000 10,000 45 45 23,000
0.250 mm 0.050 mm 32,000 10,000 50 40 22,000
Eighth Hard 36,000 28,000 40 60 10 25,000
Quarter Hard 38,000 30,000 35 70 25 25,000
Hard 50,000 45,000 12 90 50 28,000
As Hot Rolled 32,000 10,000 50 40 22,000
1.0 in. Hard 45,000 40,000 20 85 45 26,000

C120 Copper Physical Properties

UNS C12000 is a copper alloy known for its remarkable physical properties. This special alloy has a number of desirable characteristics, such as high strength, impressive electrical and thermal conductivity, and great ductility. Copper C120’s incredible resilience allows it to withstand even the most extreme temperatures and conditions without losing any of its integrity, making it an ideal material for electrical wiring, automotive brake lines, marine systems, and other applications that require materials able to endure tough conditions. Additionally, the superior machining capabilities of this copper alloy make it invaluable for creating intricate components with exact specifications. With so many benefits to offer, no wonder why Copper C120 is a favoured alloy among engineers!

English Units C.G.S. Units
Melting Point (Liquidus) 1981°F 1083°C
Melting Point (Solidus) 1,949°F 1,065°C
Density .321-.323 lb./cu. in. @ 68°F 8.89-8.94 gm./cu. cm. @ 20°C
Specific Gravity 8.89-8.94 8.89-8.94
Coefficient of Thermal Expansion .0000094 per °F from 68°F to 212°F .0000170 per °C from 20°C to 100°C
Coefficient of Thermal Expansion .0000096 per °F from 68°F to 392°F .0000173 per °C from 20°C to 200°C
Coefficient of Thermal Expansion .0000098 per °F from 68°F to 572°F .0000177 per °C from 20°C to 300°C
Thermal Conductivity 210 Btu./sq. ft./ft./hr/°F @ 68°F .88 cal/sq. cm/cm/seC/°C @ 20°C
Electrical Resistivity (Annealed) 11.0 Ohms (circ. mil./ft.) 0 68°F 1.91 Microhm-cm @ 20°C
Electrical Conductivity* (Annealed) 97% IACS @ 68°F .536 Megohm-cm @ 20°C
Thermal Capacity (Specific Heat) .092 Btu./lb./°F @ 68°F .092 cal./gm./°C @ 20°C
Modulus of Elasticity (Tension) 17,000,000 psi 12,000 Kg./sq. mm
Modulus of Rigidity 6,400,000 psi 4,500 Kg./sq. mm

C120 Copper Thermal Properties

Treatment Minimum* Maximum*
* Temperature is measured in Fahrenheit.
Annealing 700 1200
Hot Working Temperature 1400 1600

C120 Copper Equivalent

ASME SB42 ASTM B272 ASTM B442 ASTM B641 MIL B-18907
ASME SB75 ASTM B280 ASTM B447 ASTM B68 MIL B-20292
ASTM B111 ASTM B302 ASTM B451 ASTM B687 MIL T-24107
ASTM B133 ASTM B306 ASTM B5 ASTM B698 MIL T-3235
SAE J463 MIL W-85 SAE J461

C120 Copper Uses

Due to its excellent properties, UNS C12000 has a number of uses in many different industries, including electrical engineering; it can be used as an alternative to brass or bronze in alloys such as lead-free solder or insulated wire products like cables and connectors. It’s also commonly used in marine applications as well as architecture and construction projects due to its corrosion resistance. Additionally, it can be found in medical devices such as stethoscopes or surgical instruments because it has good malleability and formability characteristics which make it easy to shape into intricate components for medical devices.

Corrosion Resistance

Copper C120 has excellent corrosion resistance even when exposed to salt water or other corrosive chemicals; this makes it ideal for use in marine environments or other areas where there may be exposure to corrosive elements.

Heat Resistance

In terms of heat resistance, Copper C120 has a good thermal conductivity which allows it to withstand higher temperatures without losing its strength or shape; this makes it perfect for use in high-temperature applications such as turbines or boilers where temperatures can reach up to 600°F (316°C).

Heat Treatment

Copper C120 can be heat treated using annealing techniques; this process involves heating the material up above 1000°F (538°C), then cooling slowly over time at room temperature until the desired hardness level is achieved.


This material can be machined relatively easily with standard machining tools such as drills or lathes; however, special cutting fluids must be used when drilling holes into the material because regular cutting fluids will cause oxidation that could damage the material’s surface integrity over time.


Copper C120 welding is a specialized skill needed in many industries today. Highly trained professionals must have intimate knowledge of the safety protocols involved, as well as understand the process of melting, joining and forming metals. The results of this type of welding can be seen in industries like automotive, marine, aerospace, and construction engineering. Copper C120 welding requires precision and attention to detail for reliable results every time. It is a valuable service for those looking to put their best foot forward when it comes to creating durable structures that can withstand extreme conditions. With its demanding standards and skilled craftsmanship, copper C120 welding ensures projects are handled with care and professionalism at all times.


In conclusion, Copper C120 is an ideal material for many different applications due to its excellent mechanical properties combined with great corrosion resistance and heat resistance capabilities. Its easy machinability makes it suitable for intricate parts, while its welding capability gives designers greater freedom when creating components out of this metal alloy. With its versatile characteristics and ability to withstand high temperatures without losing strength or shape, Copper C120 is an essential component for many industries today!

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