Tombasil, UNS C87800, Copper Casting Alloy

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Tombasil, UNS C87800, Copper Casting Alloy
Categories:	Metal; Nonferrous Metal; Copper Alloy; Copper Casting Alloy
Material Notes:	Casting methods recommended for this alloy: die. Applications: Bearings, gears, impellers, rocker arms, valve stems, brush holders, bearing races, small boat propellers. Classified under: Silicon bronzes and silicon brasses. ASTM B584; formerly ASTM B198-13B Typical data for separately cast test bars. Alloy does not respond to heat treating. Casting shrinkage allowance is 1.9%
Key Words:	Silicon Brass, ASTM B176; ASTM ZS144A
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Physical Properties	Original Value	Comments

Density	8.28 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Brinell	134	Sand cast
	163	Die cast
Hardness, Rockwell B	85
Tensile Strength, Ultimate	460 MPa	Sand cast
	585 MPa	Die cast
Tensile Strength, Yield	205 MPa @Strain 0.5 %	Sand cast
	310 MPa @Strain 0.5 %	Die cast
Elongation at Break	21 %	Sand cast, in 50 mm
	25 %	Die cast, in 50 mm
Creep Strength	9.50 MPa @Temperature 290 °C	for 0.00001%/h
	75.0 MPa @Temperature 230 °C	for 0.00001%/h
	195 MPa @Temperature 175 °C	for 0.00001%/h
Rupture Strength	20.0 MPa @Temperature 290 °C, Time 3.60e+8 sec
	125 MPa @Temperature 230 °C, Time 3.60e+8 sec
Modulus of Elasticity	106 GPa	Sand cast
	138 GPa	Die cast
Compressive Strength	183 MPa	at permanent set of 0.1%
	515 MPa	at permanent set of 10%
Fatigue Strength	150 MPa @# of Cycles 1.00e+8	rotating beam
	150 MPa @# of Cycles 5.00e+7 - 2.00e+8
	170 MPa @# of Cycles 6.00e+6 - 5.00e+7
	205 MPa @# of Cycles 600000 - 4.00e+6
	240 MPa @# of Cycles 100000 - 600000
	275 MPa @# of Cycles 60000 - 250000
Machinability	40 %	UNS C36000 (free-cutting brass) = 100%
Charpy Impact	43.0 J	V-notch

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.0000284 ohm-cm @Temperature 20.0 °C
	0.0000284 ohm-cm @Temperature 15.0 °C
	0.0000287 ohm-cm @Temperature 35.0 °C
	0.0000291 ohm-cm @Temperature 60.0 °C
	0.0000294 ohm-cm @Temperature 85.0 °C
	0.0000297 ohm-cm @Temperature 120 °C
	0.0000302 ohm-cm @Temperature 150 °C
	0.0000305 ohm-cm @Temperature 175 °C
	0.0000310 ohm-cm @Temperature 205 °C
	0.0000315 ohm-cm @Temperature 230 °C
	0.0000318 ohm-cm @Temperature 255 °C
	0.0000323 ohm-cm @Temperature 285 °C
Magnetic Permeability	1.0

Thermal Properties	Original Value	Comments
CTE, linear	17.1 µm/m-°C @Temperature 75.0 °C
	17.5 µm/m-°C @Temperature 105 °C
	17.8 µm/m-°C @Temperature 130 °C
	18.3 µm/m-°C @Temperature 160 °C
	18.7 µm/m-°C @Temperature 185 °C
	18.9 µm/m-°C @Temperature 210 °C
	19.1 µm/m-°C @Temperature 240 °C
	19.5 µm/m-°C @Temperature 270 °C
	19.6 µm/m-°C @Temperature 20.0 - 260 °C
	19.7 µm/m-°C @Temperature 295 °C
	19.9 µm/m-°C @Temperature 325 °C
Specific Heat Capacity	0.375 J/g-°C
Thermal Conductivity	26.0 W/m-K @Temperature 20.0 °C
	27.0 W/m-K @Temperature 35.0 °C
	28.0 W/m-K @Temperature 20.0 °C
	29.0 W/m-K @Temperature 70.0 °C
	32.0 W/m-K @Temperature 95.0 °C
	34.0 W/m-K @Temperature 120 °C
	36.0 W/m-K @Temperature 150 °C
	38.0 W/m-K @Temperature 175 °C
	39.0 W/m-K @Temperature 200 °C
	42.0 W/m-K @Temperature 230 °C
	44.0 W/m-K @Temperature 260 °C
	46.0 W/m-K @Temperature 290 °C
Melting Point	821 - 917 °C
Solidus	821 °C
Liquidus	917 °C
Shrinkage	1.5 - 1.9 %	Patternmaker's Shrinkage

Processing Properties	Original Value	Comments
Annealing Temperature	260 °C	Stress-Relieving Temperature
Casting Temperature	955 - 980 °C

Component Elements Properties	Original Value	Comments
Aluminum, Al	<= 0.15 %
Copper, Cu	80 - 83 %
Iron, Fe	<= 0.15 %
Lead, Pb	<= 0.15 %
Magnesium, Mg	<= 0.010 %
Manganese, Mn	<= 0.15 %
Other, total	<= 0.25 %
Silicon, Si	3.75 - 4.25 %
Tin, Sn	<= 0.25 %
Zinc, Zn	14 %

References for this datasheet.

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MC87800b1 / 11924

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