ASTM B98 Specification

This specification establishes requirements for coppersilicon rod, bar, and shapes for UNS Alloys C65100, C65500,and C66100.The values stated in inch-pound units or SI units are to be regarded separately as standard. Within the text, SI units are shown in brackets. The values in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.

Chemical Composition

  Composition, % Maximum (Unless Shown as a Range or Minimum)
Copper Alloy UNS No.
C65100 C65500 C66100
Copper (Includes silver) remainder remainder remainder
Lead 0.05 0.05 0.20–0.8
Iron 0.8 0.8 0.25
Zinc 1.5 1.5 1.5
Manganese 0.7 0.50–1.3 1.5
Silicon 0.8–2.0 2.8–3.8 2.8–3.5
Nickel (includes cobalt) . . . 0.6 . . .

Mechanical Properties

Temper Designation Diameter or Distance Between Parallel Surfaces,A in. Tensile Strength min, ksi Yield Strength at 0.5 % Extension Under Load, min, ksi Elongation in 4 3 Diameter or Thickness of Standard Name Specimen, min, %B
Standard Name
Copper Alloy UNS No. C65100 Rods, Bars, and Shapes
O60 Soft anneal All forms, all sizes 40 12 30
H02 Half-hard Rods:      
    Up to 1⁄2, incl 55 20 11
    Over 1⁄2 to 2, incl 55 20 12
    Bars and shapes C C C
H04 Hard Rods:      
    Up to 1⁄2, incl 65 35 8
    Over 1⁄2 to 2, incl 65 35 10
    Bars and shapes C C C
H06 Extra-hard Rods:      
    Up to 1⁄2, incl 85 55 6
    Over 1⁄2 to 1, incl 75 45 8
    Over 1 to 11⁄2, incl 75 40 8
Copper Alloy UNS Nos. C65500 and C66100 Rectangular Bars
O60 Soft anneal All sizes 52 15 35
H04 Hard Up to 1, incl 65 38 20
    Over 1 to 11⁄2, incl 60 30 25
    Over 11⁄2 to 3, incl 55 24 27
Copper Alloy UNS Nos. C65500 and C66100 Rods, Square Bars, and Shapes
O60 Soft anneal All forms, all sizes 52 15 35
H01 Quarter-hard All forms, all sizes 55 24 25
H02 Half-hard Rods and square bars:      
    Up to 2, incl 70 38 20
    Shapes C C C
H04 Hard Rods and square bars:      
    Up to 1⁄4, incl 90 55 8
    Over 1⁄4 to 1, incl 90 52 13
    Over 1 to 11⁄2, incl 80 43 15
    Over 11⁄2 to 3, incl 70 38 17
    Over 3 C C C
    Shapes C C C
H06 Extra-hard Rods: up to 1⁄2, incl 100 55 7
Note: A. For rectangular bar, the Distance Between Parallel Surfaces refers to thickness.
B. In any case a minimum gage length of 1 in. shall be used.
C. As agreed upon between manufacturer and purchaser.
Temper Designation Diameter or Distance Between Parallel Surfaces,A mm Tensile Strength min, MPa Yield Strength at 0.5 % Extension Under Load, min, MPa Elongation, min, %B
Standard Name
Copper Alloy UNS No. C65100 Rods, Bars, and Shapes
O60 Soft anneal All forms, all sizes 275 85 30
H02 Half-hard Rods:      
    Up to 12, incl 380 140 11
    Over 12 to 2, incl 380 140 12
    Bars and shapes C C C
H04 Hard Rods:      
    Up to 1⁄2, incl 450 240 8
    Over 1⁄2 to 2, incl 450 240 10
    Bars and shapes C C C
H06 Extra-hard Rods:      
    Up to 1⁄2, incl 585 380 6
    Over 1⁄2 to 1, incl 515 310 8
    Over 1 to 11⁄2, incl 515 275 8
Copper Alloy UNS Nos. C65500 and C66100 Rectangular Bars
O60 Soft anneal All sizes 360 105 35
H04 Hard Up to 1, incl 450 260 20
    Over 1 to 11⁄2, incl 415 205 25
    Over 11⁄2 to 3, incl 380 165 27
Copper Alloy UNS Nos. C65500 and C66100 Rods, Square Bars, and Shapes
O60 Soft anneal All forms, all sizes 360 105 35
H01 Quarter-hard All forms, all sizes 380 165 25
H02 Half-hard Rods and square bars:      
    Up to 2, incl 485 260 20
    Shapes C C C
H04 Hard Rods and square bars:      
    Up to 1⁄4, incl 615 380 8
    Over 1⁄4 to 1, incl 615 360 13
    Over 1 to 11⁄2, incl 545 295 15
    Over 11⁄2 to 3, incl 485 260 17
    Over 3 C C C
    Shapes C C C
H06 Extra-hard Rods: up to 1⁄2, incl 690 380 7
Note:

A. For rectangular bar, the Distance Between Parallel Surfaces refers to thickness.
B. Elongation values are based on a gage length of 5.65 times the square root of the area for dimensions greater than 2.5 mm.
C. As agreed upon between manufacturer and purchaser.

Rockwell Hardness Requirements (Imperial)A

Temper Designation Diameter or Distance Between Parallel Surfaces,B in. Rockwell B Hardness Determined on the Cross Section Midway Between Surface Standard Name and Center
Standard Name
Copper Alloy UNS No. C65100 Rods, Bars, and Shapes
H02 Half-hard 0.5 to 2.0 , incl 60–85
H04 Hard 0.5 to 2.0, incl 65–90
H06 Extra-hardC 0.5 to 1.5, incl 75–95
Copper Alloy UNS Nos. C65500 and C66100 Rectangular Bars
H04 Hard 0.5 to 3.0, incl 60–95
Copper Alloy UNS Nos. C65500 and C66100 Rods, Square Bars, and Shapes
H02 Half-hard 0.5 to 1.0, incl 75–95
    over 1.0 to 1.5, incl 75–95
    over 1.5 to 3.0, incl 75–95
H04 Hard 0.5 to 1.0, incl 85–100
    over 1.0 to 1.5, incl 80–95
    over 1.5 to 3.0, incl 75–95
Note:

A. Rockwell hardnesses are not established for diameters less than 0.5 in..
B. For rectangular bar, the Distance Between Parallel Surfaces refers to thickness.
C. Bars and shapes are not produced in the H06 temper.

Rockwell Hardness Requirements (Metric)A

Temper Designation Diameter or Distance Between Parallel Surfaces,B in. Rockwell B Hardness Determined on the Cross Section Midway Between Surface Standard Name and Center
Standard Name
Copper Alloy UNS No. C65100 Rods, Bars, and Shapes
H02 Half-hard 12 to 50, incl 60–85
H04 Hard 12 to 50, incl 65–90
H06 Extra-hardC 12 to 50, incl 75–95
Copper Alloy UNS Nos. C65500 and C66100 Rectangular Bars
H04 Hard 12 to 75, incl 60–95
Copper Alloy UNS Nos. C65500 and C66100 Rods, Square Bars, and Shapes
H02 Half-hard 12 to 25, incl 75–95
    25 to 38, incl 75–95
    over 38 to 75, incl 75–95
H04 Hard 12 to 25, incl 85–100
    over 25 to 38, incl 80–95
    over 38 to 75, incl 75–95
Note:

A. Rockwell hardnesses are not established for diameters less than 12 mm.
B. For rectangular bar, the Distance Between Parallel Surfaces refers to thickness.
C. Bars and shapes are not produced in the H06 temper.