COPPER ALLOY
DATA SHEET
C36000
Free Cutting Brass C36000 is nominally composed of 61.5% copper, 35.4% zinc, and 3.1% lead. It is the alloy most often used for continuous high-speed machining operations. This is because its high lead content creates machined chips, which are short and easily freed from the work, hence, the name "free cutting." This results in minimal tool wear, tool breakage, and unnecessary downtime during machining use. Alloy C36000 is thus considered the standard free cutting copper alloy, and, as a result, its machinability index has been arbitrarily rated as "100", thereby becoming the standard to which all other copper alloys are compared. In volume, it is probably used for rod more than all other copper alloys combined.
Hot Working and Cold Working: C36000 has fair hot workability. It can be hot worked if mechanically supported. It can be extruded readily and may be forged or hot rolled. Due to its high lead content, it has poor cold workability. Although it can withstand a limited amount of cold work, non-leaded brasses of higher copper content are much more suitable for cold working applications. Common fabrication processes are machining, roll threading and knurling.
Joining: Joining by soldering is excellent, while good by brazing. The lead content prevents successful welding.
Applications: Typical uses of C36000 are for hardware such as gears and pinions where excellent machinability is an important requirement, as well as for all types of automatic high-speed screw machine products. Specific applications include faucet stems and seats, gauges, lock hardware, and valve stems, seats, and trim.
Applicable Specifications: When so specified, C36000 will be manufactured to the latest revision of the following specifications: ASTM Specification B16 and AMS Specification 4610.
Standard Forms Available: Rod, bar, wire and shapes. Although C36000 is typically designed for free cutting applications, Ansonia Copper & Brass can supply you with this alloy with special chemistry or temper if needed to meet your particular requirements such as additional ductility to permit spinning, heading or cold forming operations in conjunction with machining.
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ADS No. C36000 |
Rev. No. 3 |
Rev. Date 10/19/00 |
C36000 |
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P. O. Box 109 – Ansonia,
Connecticut 06401 |
725 Bank St. - Waterbury,
Connecticut 06708 |
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Tel.: 1-800-521-1703 FAX 203-735-3787 |
Tel.: 1-800-243-3204 FAX 203-756-1330 |
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PROPERTIES OF C36000
Nominal Composition: 61.5% Copper
35.4% Zinc
3.1% Lead
Physical Properties:
Melting Point (Liquidus): 900°C (1650°F)
(Solidus): 885°C (1630°F)
Density
at 68°F: 0.307
Lbs./In.3
Average Coefficient of Linear Thermal Expansion per °F: 1.14 x 10-5 (68-572°F)
Electrical Conductivity at 68°F (volumetric): 26% IACS (in annealed condition; lower for hard temper)
Thermal Conductivity Btu/ft.2/ft./hr./°F at 68°F: 67
Modulus of Elasticity - Tension: 14,000 ksi
Modulus of Rigidity: 5,300 ksi
Fabrication
Properties:
Hot Working Temperature: 700-800°C (1300-1450°F)
Annealing Temperature: 425-600°C (800-1100°F)
Approximate Relative Machinability: 100
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Mechanical Properties |
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Tensile Strength (psi) |
Yield Strength (0.5% EUL) (psi) |
% Elongation (in 2") |
Rockwell Hardness |
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0.250" Dia. Rod |
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1/2 Hard (25%) |
68,000 |
52,000 |
18 |
HRB 80 |
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1.0" Dia. Rod |
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Soft Anneal |
49,000 |
18,000 |
53 |
HRF 68 |
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1/2 Hard (20%) |
58,000 |
45,000 |
25 |
HRB 78 |
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2.0" Dia. Rod |
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1/2 Hard (15%) |
55,000 |
44,000 |
32 |
HRB 75 |
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ADS No. C36000 |
Rev. No. 3 |
Rev. Date 10/19/00 |
C36000 |
The
statements and data provided on this data sheet are to be considered only as a
general guide. Commercial variations in
material properties are expected, so values listed here are not intended to be
used for specifications. Please consult
the appropriate industry specifications where applicable. Ansonia Copper & Brass, Inc. also cannot
assume responsibility for performance of these products in service because we
do not control or supervise subsequent use of our products.