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C93800 High Leaded Tin Bronze :

Copper Alloy No. C93800

High Leaded Tin Bronze SAE 67 , CDA 938 , 78-7-15

ASTM B 505 , ASTM B 271

Chemical Composition % by weight

Element	Nominal	Minimum	Maximum
Aluminum	-	-	.005
Antimony	-	-	.8
Copper	77	75	79
Iron	-	-	.15
Lead	14.5	13	16
Nickel	-	-	1
Phosphorus	-	-	.05
Silicon	-	-	.005
Sulfur	-	-	.08
Tin	6.9	6.3	7.5
Zinc	-	-	.8

Applications

Bearings for general service and moderate pressures, pump impellers and bodies for use in acid mine water. Turbocharger bearings.

Mechanical Properties

M07 - As Continuous Cast

Hardness*	Brinell Hardness (500 kg load)	55
Tensile Strength**	KSI	30
Yield Strength **	KSI (0.5% Ext. under load)	16
Elongation**	% in 2 inch	18

**Test values are nominal approximations and depend on specimen size and orientation.

Physical Properties

Thermal Conductivity	BTU/ (sq ft-ft-hr-F)	30
Specific Heat	BTU/lb/ºF @ 68F	.09
Thermal Expansion	Per °F from 68 F to 400 F	.0000103
Density	lb/cu in @ 68 F	.334
Electrical Conductivity* (Annealed)	% IACS @ 68 F	11.5
Modulus of Elasticity	KSI	10,500

*Volume basis

Fabrication Practices

Stress relieving temperature 500 F or 260 C

Time at temperature 1 hour per inch of section thickness

Responds to heat treatment No

Machinability rating (Free Cutting Brass=100) 80

Suitability for being joined by: Soldering/Good

Brazing/Poor*

Oxyacetylene Welding/Not Recommended

Gas Shielded Arc Welding/Not Recommended

Coated Metal Arc Welding/Not Recommended

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