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C90300 Tin Bronze

ASTM B30, ASTM B271/B271M, ASTM B505, ASTM B584,ASTM B 763/B736M, SAE J461, SAE J463, SAE 620, MILC-11866, UNS C90300

Level 4
Level 3
Level 2
Oxyacetylene Welding

Farmers Copper Ltd. keeps a regular stock of Tin Bronze 903 in solid rod form. C90300 offers good mechanical and corrosion resistance; it is often used in castings for liquid and gas, not to mention valves and pumps. Copper Alloy 903 can be excellently soldered while offering good brazing. C903 holds a characteristic of high wear resistance, which has made it a common alloy to many usages.

C90300 Tin Bronze Shapes

C90300 Tin Bronze Sizing

  • Solid Bar (1” dia to 6”)

C90300 Tin Bronze Applications

  • Seal rings

  • Bushings

  • Bearings

  • Valve Components

  • Building

  • Fasteners

  • Industrial

  • Plumbing


Farmer’s Copper Ltd. extends its services throughout many industries. We provide the raw copper alloy materials in various standard shapes as well as custom cut copper alloys.

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Our C90300 Tin Bronze Inventory & Properties

Farmer’s diverse inventory of products and services offered provides our customers the largest and most extensive selection of alloys available, cut to precise specifications, and delivered with total quality control.

Chemical Composition

Cu(1,2) Pb SnZnFeP(3)Ni(4)AlSSbSi
Min (%) 86.07.5 3.0
Max (%)89.00.30 9.0 5.0

Physical Properties

Melting Point - Liquidus°F 1832
Melting Point - Solidus°F 1570
Densitylb/cu in. at 68°F0.318
Specific Gravity8.8
Electrical Conductivity% IACS at 68°F12
Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F43.2
Coefficient of Thermal Expansion 68-39210⁻⁶ per °F (68 – 392°F) 10
Specific Heat CapacityBtu/ lb /°F at 68°F0.09
Modulus of Elasticity in Tensionksi14000
Magnetic Permeability 1

Fabrication Properties

Technique SuitabilityFootnote
Brazing Good Since brazing is performed in the hot short range, strain must be avoided during brazing and cooling.
Oxyacetylene WeldingFair
Gas Shielded Arc WeldingFair
Coated Metal Arc WeldingFair
Machinability Rating30

Mechanical Properties

Form TemperTemper CodeTensile Strength (ksi)YS-0.5% Ext (ksi)Elongation (%)Brinell Hardness, 500 kg loadIzod (ft-lbs)Charpy V-Notch Impact Strength (ft-lbs)Compressive Strength .001 in. set/in. (ksi)
As Centrifugal CastAs Centrifugal CastM0240 Min for Standard 40 Min for Standard 45 Typ18 Min for Standard 18 Min for Standard 21 Typ20 Min for Standard 20 Min for Standard 30 Typ70 Typ14 Typ13 Typ
As Continuous CasAs Continuous CastM0744 Min for Standard 44 Min for Standard22 Min for Standard 22 Min for Standard18 Min for Standard 18 Min for Standard
As Sand CastAs Sand CastM0140 Min for Standard 40 Min for Standard 45 Typ18 Min for Standard 18 Min for Standard 21 Typ20 Min for Standard 20 Min for Standard 30 Typ70 Typ14 Typ14 Typ13 Typ

Our Commitment to Service

As a leading copper, brass, & bronze alloys supplier, Farmers Copper Ltd. attributes our success to serving our customers, through our service-minded employees and material readily available for prompt, accurate deliveries of copper, brass, bronze, stainless steel and other metal alloys.

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