Tempered, Alloy 25 (C17200) - Plated Wire Supplier

ISO 9001-2008
Gold plated Be Cu # 25 alloyPlated Wire, Phosphor Bronze WireNickel Wire, Flat Wire, Square WireBeryllium Copper wire
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Tempered, Alloy 25 (C17200)

Beryllium Copper is our specialty. We have pioneered the use of this metal since its commercial inception and have led in its development and uses.

BERYLLIUM COPPER
C17200 Tempered, 25 Alloy

Tempered Beryllium Copper was developed by Little Falls Alloys to supply the springs industry with a Beryllium Copper wire that could be used on conventional coiling equipment to provide springs to close tolerance without the necessity of heat treatment. The advantages: Springs are not discolored by heat treatment, thus require no pickling and cleaning.

Springs are free of heat-treat distortion, giving close tolerance without expensive fixtures. Spring Coilers without heat treat facilities can supply Beryllium Copper springs. Pretensioned extension springs can be wound, which is not possible with heat treatable Beryllium Copper.

The disadvantages: Since the temper comes from cold work, the tempered wire spring is not useable at as high a temperature as heat treated Beryllium Copper. Tempered Beryllium Copper has been used in all applications listed for Heat Treated Beryllium Copper.

COMPOSITION
BERYLLIUM COPPER C17200

ELEMENT PERCENT
NOMINAL
MINIMUM
MAXIMUM
Copper 98.1 - -
Beryllium 1.90 1.80 2.0
Cobalt & Nickel - .20 -
Cobalt & Nickel & Iron - - .60
Cu + Be + Co + Ni + Fe - 99.50 -
Silicon - - .20
Aluminum - - .20
Lead - - .20 - .60 (C17300)

 

PHYSICAL PROPERTIES
BERYLLIUM COPPER C17200

HEAT TREATED CONDITION
ENGLISH UNITS METRIC UNITS
Melting Range 1590 - 1800АF 870 - 980АC
Density .302 lb/cu in. @ 68АF 8.35 gm/cm@ 20АC
Specific Gravity 8.26 8.26
Coefficient of Thermal Expansion .0000099 per АF (68-572АF) .0000178 per АC (20-300АC)
Thermal Conductivity 62-75 BTU/sq ft/ft/hr/АF @ 68АF .26-.31 cal/sq cm/cm/sec/АC
@ 20АC
Electrical Resistivity 46.2 Ohms-circ mil/ft @ 68АF 7.68 microhm - cm @ 20АC
Electrical Conductivity 19-28% Copper IACS @ 68АF .110-.163 megohm cm @ 20АC
Specific Heat .10 BTU/lb/АF @ 68АF .10 cal/gm/АC @ 20АC
Modulus of Elasticity (tension)
18,500 KSI* 13,000 kg/sq mm
Modulus of Rigidity (torsion) 7,300 KSI 5,000 kg/sq mm
Stress Relief Temperature 400-500АF - 30-60 minutes 205-260АC - 30-60 minutes

* 1 KSI equals 1,000 PSI
Compression Springs should be stress relieved to eliminate undesirable cooling stresses --
450АF for 30 minutes is typical.

MECHANICAL PROPERTIES
BERYLLIUM COPPER C17200

For Round and Square Tempered Spring Wire
SIZE
TENSILE STRENGTH
KSI* MPa**
.001 to .010 inclusive 185-240 1310-1520
Over .010 to .0253 inclusive 180-210 1240-w1450
Over .0253 to .050 inclusive
165-200 1170-1380
Over .050 to .075 inclusive 140-165 1030-1240

 

MECHANICAL PROPERTIES
BERYLLIUM COPPER C17200

For Tempered Round Wire ASTM B197
SIZE TENSILE STRENGTH
KSI* MPa**
.050 to .075 Inclusive 140-165 970-1140
Over .075 to .100 inclusive 120-140 830-970
Over .100 to .114 inclusive 115-130 795-900

 

MECHANICAL PROPERTIES
BERYLLIUM COPPER C17200

For Tempered Flat Wire ASTM B194

DESIGNATION TENSILE STRENGTH YIELD STRENGTH
KSI* MPa** KSI* MPa**
AM (TM00) 100-110 690-760 75-90 520-620
1/4 HM (TM01) 110-120 760-830 90-110 620-760
1/2 HM (TM02) 120-135 830-930 100-125 690-860
HM (TM04) 135-150 930-1030 115-135 790-930
SHM (TM05) 150-160 1030-1100 125-140 860-970
XHM (TM06) 160-175 1100-1210 145-170 1000-1170
XHMS (TM08) 175-190 1210-1310 155-180 1070-1240

Beryllium Copper Flat Wire is supplied with either round or square edges. It is conveniently supplied to the same temper ranges as mill hardened strip although produced by a different process.

* 1 KSI equals 1,000 PSI
** 1 KSI equals 6.894,757 MPa (Megapascal)

BERYLLIUM COPPER, C17200

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Paterson NJ 07501

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