Beryllium Copper Alloy C17000

  • Beryllium Copper Alloy C17000

  • General Characteristics

    C17000 is a part of the “gold alloys” because of the shiny luster imparted by the substantial amount of beryllium present (~12 at. %). The gold alloys are the high-strength beryllium-coppers because they can attain yield strengths ranging from approximately 205 to 690 MPa (30 to 100 ksi) in the age-hardenable condition to above 1380 MPa (200 ksi) after aging. Conductivity ranging from about 20% to higher than 30% IACS is obtained in wrought products depending on the amount of cold work and the heat treatment schedule.

    Typical uses: bellows, bourdon tubing, diaphragms, fuse clips, fasteners, lock washers, springs, switch parts, roll pins, valves, welding equipment.

  • Typical Chemical Composition

    Weight % Be Ni+Co Ni+Co+Fe Cu
    minimum 1.60 0.20 — Bal
    maximum 1.79 — 0.60

  • Physical Properties

    Characteristics English Metric
    Nominal density

    (68°F/20°C)

    		 0.298 lbs/in3 8.26 g/cm3
    Specific heat

    (212 °F/100°C)

    		 0.10 BTU/lb – °F 420 J/KG- °K
    Melting range 1590-1800 °F 865-980 °C
    Coefficient of thermal

    expansion

    		 68°F – 212°F

    20°C – 100°C

    		 9.3 micro in/in- °F 16.7 micro m/m- °K
    68°F – 392°F

    20°C – 200°C

    		 9.4 micro in/in- °F 17.0 micro m/m- °K
    68°F – 572°F

    20°C – 300°C

    		 9.9 micro in/in- °F 17.8 micro m/m- °K
    Thermal conductivity 20°C   /   68°F 69 BTU/ft- hr – °F 118 W/m – °K
    200°C / 392°F 84 BTU/ft- hr – °F 145 W/m – °K
    Electrical resistivity 20°C   /   68°F 76.8 nΩ ∙ m
    Electrical conductivity Volumetric:

    20°C   /   68°F

    		 15-33% IACS

  • Mechanical Properties

    Temper Tensile Hardness Electrical Conductivity
    Ultimate Yield Elongation

    in 50 mm

    (2 in.)

    		 Rockwell B %IACS
    KSI MPa KSI MPa % %IACS
    TB00 – Solution Heat Treated All Sizes 60-

    85

    		 415-

    585

    		 20-

    30

    		 140-

    205

    		 35-60 45-85 17-19
    TF00 – Precipitation Hardened (AT)  Aged

    3 h at 350 °C

    		 150-

    180

    		 1035-1240 125-

    155

    		 860-

    1070

    		 4-10 32-39 HRC 22-25
    TD04 – Solution Heat Treated and Cold Worked: Hard (H) <9.5 mm

    (3/8 in.)

    		 95-

    130

    		 655-

    895

    		 75-

    105

    		 515-

    725

    		 10-20 92-103 15-17
    9.5-25 mm

    (3/8-1 in.)

    		 90-

    120

    		 620-

    825

    		 75-

    105

    		 515-

    725

    		 10-20 91-102 15-17
    >25 mm

    (1 in.)

    		 85-

    115

    		 585-

    795

    		 75-

    105

    		 515-

    725

    		 10-20 88-101 15-17
    TH04 – Hard and Precipitation Heat Treated (HT) Aged

    2 to 3 h at 330 °C

    		 <9.5 mm

    (3/8 in.)

    		 175-

    200

    		 1205-1380 135-

    165

    		 930-

    1140

    		 2-5 36-41 HRC 22-25
    9.5-25 mm

    (3/8-1 in.)

    		 170-

    195

    		 1170-1345 135-

    165

    		 930-

    1140

    		 2-5 35-40 HRC 22-25
    >25 mm

    (1 in.)

    		 165-

    190

    		 1140-1310 135-

    165

    		 930-

    1140

    		 2-5 34-39 HRC 22-25

  • Specifications

    • AMS – QQ-C-533
    • ASTM – B194
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