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C90300 Tin Bronze available from Dura-Bar Metal Services. #

Tin Bronze C90300 (SAE 620)

A proven alloy in a wide number of uses, C90300 (SAE 620) Tin Bronze is most often used in high load, low speed applications. The alloy is hard, strong and can be counted on to withstand wear and corrosion. C90300 can be used for welding, brazing and soldering. Final components made of this alloy require good alignment and lubrication of mated parts.

Also known as: CDA 903, Navy "G" Bronze, Naval Bronze, Gear Bronze, 88-8-0-4, SAE 620, ASTM B-271 Alloy C90300, ASTM B-505 Alloy C90300, ASTM B-271 Alloy C90300, QQC-390 Alloy D5, QQC-390 Rev. A/B Alloy C90300.

Chemical Composition
Cu% Sn% Pb% Zn% Fe% Ni% Sb% P% S% AI% Mn% Si%
0.30 3.00-
0.20 1.00 0.20 1.50 0.05 0.005 N/A 0.005

Typical Uses

Valves, Potable Water Applications, Gears, Pump Components, Bearings, Bushings, Pump Impellers, Piston Rings, Valve Components, Seal Rings, Steam Fittings, Trunnion Bearings, Wrist-Pin Bushings, Piston-Pin Bushings, Machine Tool Bushings, Roll-Mill Bearings, and Bridge Bearings
Marine Fittings
Plumbing Fixtures

Alloy Properties

Tensile Strength, min 44 ksi N/A
Yield Strength @ .5% ext under load min 22 ksi N/A
Elongation in 2 in. or 50 mm min, %   18
Brinell Hardness, min   70 typical Bhn (500 kg)
Machinability Rating   30%
  US Customary Metric
Melting Point-Liquidus 1832 F 1000 C
Melting Point-Solidus 1570 F 854 C
Density 0.318 lb/cu in
@ 68 F
8.81 gm/cu cm
@ 20 C
Specific Gravity 8.81 8.81
Electrical Resistivity N/A N/A
Electrical Conductivity 12 %IACS @ 68 F .069 Megmho-cm @ 20 C
Thermal Conductivity 43.2 Btu/sq ft/
ft/hr/degree F @ 68 F
.18 cal/sq cm/
cm/sec/degree C @ 20 C
Coefficient of
Thermal Expansion
.000010 per degree F
from 68 F to 340 F
.000018 per degree C
from 20 C to 177 C
Specific Heat Capacity .09 Btu/lb/degree F
@ 68 F
.09 cal/gm/degree C
@ 20 C
Modulus of Elasticity
in Tension
14000 ksi 9840 Kg/sq mm
Magnetic Permeability N/A N/A
Joining Technique Suitability
Soldering Excellent
Brazing Good
Oxyacetylene Welding Fair
Gas Shielded Arc Welding Fair
Coated Metal Arc Welding Fair