Kinds of EK Metals
Alloy Mecanical properties Electrical
conductivity
Temperature
limit on heat
Equivalent
standard
Tensile strength Elongation Hardness
N/m2 % HRB L.A.C.S.%@at20
EK-2 Drown bar 450]550 15-30 78-87 78-88 480-520 JIS Z 3234-2
ISO5182-1978-2-1
RWMA Class 2
Forged Products 390-490 15-30 72-82
Characteristics
& Applications

With durability improved byadding special element to copperchromium-zirconium alloy, itexcells in electric conductivity and heat resistanze;hence,it is in usemost windely as resistance welding electrode material.

EK-3 Drown bar 510]640 15-30 85-92 50-70 490-530 RWMA Class B10
Forged Products 470-590 15-30 82-90
Characteristics
& Applications

Having excelelent mechanical strength of copper-chromium-titanium alloy, EK-3 issuited to the electrode materials working under raised welding pressure where very high strength and durability are required.

EK-4 Forged Products 690]880 10-20 95-102 15-30 490-530 RWMA Class B12
Characteristics
& Applications

Having high mechanical strength as well as excellentwear resistance of copper-titanium alloy,EK-4 is quite suitable for the use of electric conductors where high tensile strength and durability are required, EK-4 will be used as a substite for the high-priced beryllium-copper 25 alloy because it can compare with the latter quality

CZ-5 Drown bar 490]600 15-25 80-90 70-85 500-550 JIS Z 3234-2
ISO5182-1978A-2-2
RWMA Class 2
Forged Products 440-590 15-25 75-88
Characteristics
& Applications
having a high copper-chromium-zirconium content, it's high-temperature strength is best suited for seam welding electorode in particular, the surface treated steel plates resistant welding is being used.
SCZ-7 Drown bar 500]650 15-20 82-92 70-80 500-550 JIS Z 3234-2
ISO5182-1978A-2-2
RWMA Class 2
Forged Products 460-600 15-20 80-90
Characteristics
& Applications

having a high copper-chromium-zirconium alloy, it excels in high-temperature dtrength and wear resistance and ishigher in quality than CZ-5, Excels in resistance as high-intensity seam welding is being used.

EKB-50 Drown bar 730]880 9-25 93-105 45-60 480-520 JIS Z 3234-3
ISO5182-1978A-3-1
RWMA Class 3
Forged Products 690-830 9-25 93-105
Characteristics
& Applications

having the most excellent strength, wear resistance and themal themal durabillity of the beryllium-copper 50 alloy made by adding some sopecial elements to copper beryllium base alloy, EKB-50 proves its merits in the applicatins to flush butt and seam welding electorodes or holders of spot welder operating under very severe working enviroment.

EKB-55 Drown bar 750]900 5-20 98-105 48-60 480-520 JIS Z 3234-3
ISO5182-1978-3-1
RWMA Class 3
Forged Products 720-840 5-20 95-105
Characteristics
& Applications

having special elements added to the beryllium-copper alloy with a fitting heat treatment,it contains high strengh, themal conductivity and durability that excel in the high temperature range. It is higher in quality than EKB-50 and is best for used as electrode material for determined extreme conditions.

EKB-25 Drown bar 1100-1500 2-8 HRC 36-45 20-30 315-350 JIS H 3270
C1720
JIS Z 3234-4
Forged Products 970 (Min) 2(Min) HRC 33 (Min)
Characteristics
& Applications
EKB-25 metal becomes to compare with special steels in high strength by means of the pertinently suitable heat treament and it has, besides, the outstanding properties relating to those of specific spring character, electric conductivity resistance and wear resistance.
EK-NS50 Drown bar 650]850 15-25 90-105 40-50 500-550
Forged Products 600-800 15-25 90-105
Characteristics
& Applications
with it's copper-nickek-silicon-chronium alloy, and eco-friendly (conaini beryllium) attributes, it is best used as electrode material for extreme conditions.

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