Copper Alloys 5% Phosphor Bronze UNS-C51800

 Product Data Sheet – Copper Alloys

5% Phosphor Bronze  UNS-C51800

Chemical Composition

AS1572-1998

Copper Tin Phosphorus Aluminium Lead
Minimum
Remainder
4.0%
0.10%
0.01%
Maximum
~95%
6.0%
0.35%
0.02%

Equivalent Alloy Specifications

Specification Designation
UNS
C51800
ISO
Cu Sn5
BSI
PB102
JIS

Australian Product Specifications

Specification Product Form
AS1566
Rolled Flat Products
AS1567
Wrought Rods, Bars & Sections

Fabrication Properties

Joining Technique Suitability
Soldering
Excellent
Brazing
Excellent
Oxy Acetylene Welding
Fair
Gas Shielded Arc Welding
Good
Coated Metal Arc Welding
Fair
Resistance Welding (spot)
Good
Resistance Welding (seam)
Fair
Resistance Welding (butt)
Excellent
Fabrication Technique Suitability
Capacity for Being Cold Worked
Excellent
Capacity for Being Hot Worked
Limited
Hot Working Temperature
650 – 750 °C
Annealing Temperature
500 – 700 °C
Stress Relieving Temperature
200 – 350 °C
Machinability Rating
20% of free cutting brass
Polishing/Electroplating Finish
Good

Mechanical Properties

AS1566 Rolled Flat Products & AS1567 Wrought Rods, Bars & Sections.

Product
Thickness Temper 0.2% Proof Stress Minimum
Tensile Strength Minimum
Elongation
Hardness Maximum
mm MPa
MPa
%
HRB
Sheet & Flats
All
Ann, O2
365
50
85-95
Sheet & Flats
0.15-3.2
1/4 Hard
360
35
110-160
Sheet & Flats
1/2 Hard
500
10
160-180
Sheet & Flats
Hard
590
4
180-200
Sheet & Flats
0.15-2.0
EH
650
200-220
Sheet & Flats
0.15-3.2
SH
700
>220
Rod & Square Bar
6-20
M
350
460
12
Rod & Square Bar
21-40
M
320
430
12
Rod & Square Bar
41-70
M
280
380
16
Rod & Square Bar
71-120
M
240
310
20
Rod & Square Bar
>120
M
80
270
24

Available Forms can supply this alloy as coil, sheet and round rod.

General Description C51800 is the most widely used of the wrought phosphor bronzes, particularly in spring applications where the excellent resistance and fatigue endurance of various work-hardened tempers are major advantages of the alloy.

It also has a low coefficient of friction running against steel, combined with high strength. This makes it a popular choice for wear resistant guide strips and similar bearing applications involving boundary lubrication conditions.

Austral Wright Metals can also supply alloy C51000, a very similar alloy with 4.2-5.8% tin, 0.03-0.35% phosphorus without an aluminium addition, which has very similar properties and uses. Most material made to C51000 meets the specification requirements for C51800, and vice versa.

Japanese equipment often makes use of JIS C5191. This has 5.5-7.0% tin, and properties similar to C51800.

Typical Uses

Engineering: bridge bearing plates, clutch discs, lock washers.

Electrical: fuse clips, terminal connectors, contacts, switch parts, springs.

 

Hardware: lock springs, fasteners.

 

Industrial: diaphragms, sleeve bushings, bellows, press tools.

Physical Properties

Property
Metric Units
Imperial Units
Melting Point (Liquidus)
930°C
1705°F
Melting Point (Solidus)
1060°C
1940°F
Density
8.85 gm/cm³ @ 20°C
0.320 lb/in³ @ 68°F
Specific Gravity
8.85
8.85
Coefficient of Thermal Expansion
18.0 x 10 -6 / °C (20-300°C)
10.0 x 10 -6 / °F (68-392°F)
Themal Conductivity
93-96 W/m. °K @ 20°C
35-56 BTU/ft³/ft/hr/°F @ 68°F
Thermal Capacity (Specific Heat)
377 J/kg. °K @ 20°C
0.09 BTU/lb/°F @ 68°F
Electrical Conductivity (Annealed)
0.077-0.104 microhm.cm @ 20°C
13-18% IACS
Electrical Resistivity (Annealed)
13.0-9.6 microhm.cm @ 20°C
80-58 ohms (circ mil/ft) @ 68°F
Temperature Coefficient of Electrical Resistance (Annealed)
0.0009 / °C @ 0-100°C
0.0005 / °F @ 32-212°F
Modulus of Elasticity (tension)
121 GPa @ 20°C
17.6 x 10 6 psi @ 68°F
Modulus of Rigidity (torsion)
44.8 GPa @ 20°C
6.5 x 10 6 psi @ 68°F
Poisson’s Ratio
0.35
0.35

Phase Diagram for Copper Tin Alloys – Bronzes

Copper Alloys 5% Phosphor Bronze UNS-C51800

Corrosion Resistance

The corrosion resistance of 5% phosphor bronze is at least equal to copper, but the tin addition gives advantages in salt water and similar aggressive moist conditions where it is superior to copper.

Like copper, it does not suffer from dezincification and is seldom involved in stress corrosion failures unless there is a combination of very hard rolled material and specific chemicals such as mercury and ammonia compounds.

Please consult Austral Wright Metals for advice on your specific application.

 

The technical advice and recommendations made in this Product Data Sheet should not be relied or acted upon without conducting your own further investigations, including corrosion exposure tests where needed. Please consult current editions of standards for design properties. Austral Wright Metals assumes no liability in connection with the information in this Product Data Sheet. Austral Wright Metals supplies a comprehensive range of stainless steels, copper alloys, nickel alloys and other high performance metals for challenging service conditions. Our engineers and metallurgists will be pleased to provide further data and applications advice.

 

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