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NC alloys (colson system alloys)
ENC25
ENC50
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NC alloy (Colson system alloy)
 
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We are pleased to announce that our unique new, beryllium-free NC 25 and NC 50 Alloys, which have already been patented, are now available to customers all around the world.

There are no alloys anywhere on the market that can compare with these revolutionary new types of "environmentally friendly" copper alloys, which contain nickel, silicon and chromium, but no beryllium.

They boast uniform high hardness, tensile strength and yield strength, as well as high electrical conductivity. NC 25, with high tensile strength of 1 giga Pascal (145 ksi), is well-suited for machinery parts, and NC 50 features not only excellent electrical conductivity but superior thermal conductivity as well, and offers savings in lubricant cost, shorter holding time, and quality improvement in die cast production. Both offer long life due to wear resistance.

Principal Applications

  • Plunger tips
  • Injection and blow-mold fabrication material
  • High-performance engine parts
  • High-performance brake material
We are now supplying NC alloy to one of Japan's Big Three auto manufacturers. Another of the Big Three is currently evaluating this alloy, with hopes that its use will contribute to environmental sustainability.And one of the largest die cast machine makers in Japan has been conducting tests on NC Alloy, which is well-suited for plunger tips.

One promising application for this new alloy is for moving parts that are used under heavy conditions, such as in Formula 1 engines. Another is for brake material, due to the alloy's high hardness and conductivity, as well as its excellent wear resistance; NC Alloy was used as brake material in an amusement park ride in Tokyo, and demonstrated a life more than 10 times longer than conventional brake material!

Because of its superior characteristics, including high electrical conductivity and hardness, NC Alloy has been used for many other, small-to-large applications, such as welding LED crystal oscillator parts to lids for cell phones, resistance welding large anchors for ships, and so on.

 
  NC25 (Cu]Ni]Si-Cr system alloy)
 
yChemical Composition(mass%)z
  Ni Si Cr Cu
Nominal 6.5-8.8 1.5-2.5 0.3-1.3 bal.
 
yTypical Mechanical Propertiesz
Condition Tensile Strength
MPa
0.2%Yield Strength
MPa
Elongation
%
Hardness
HBW(10/3000)
as aged 820-1000 650-980 2-10 250-270
 
yTypical Physical Propertiesz
Condition Electrical Conductivity
IACS%
Thermal Conductivity
W/mEK
Specific Heat
J/gEK
Density
g/cm3
as aged 27 130 0.40 8.7
 
yProcessz
  • Melting & Durville Casting@¨@Elimination of internal defects
  • Hot Forging or Extrusion@¨@Refining and uniform dispersion of Ni2Si compounds
  • Solution Treatment@¨@Rapid quenching without cracking
  • Aging@¨@Precipitation hardening and increase of electrical conductivity
 
yMicrostructures of NC25z
Microstructures of NC25
Fig.1
NC25, as cast.
Microstructures of NC25
Fig.2
NC25, hot forged plate, as aged.
   
 
  NC50 (Cu]Ni]Si-Cr-Sn system alloy)
 
yChemical Composition(mass%)z
  Ni Si Cr Sn Cu
Nominal 1.7-2.5 0.3-0.7 0.5-1.2 0.1-0.3 bal
 
yTypical Mechanical Propertiesz
Condition Tensile Strength
MPa
0.2%Yield Strength
MPa
Elongation
%
Hardness
HRB
as aged 650-850 600-800 >9 >90
 
yTypical Physical Propertiesz
Condition Electrical Conductivity
IACS%
Thermal Conductivity
W/mEK
Density
g/cm3
as aged 40-50 180 8.7
 
yProcessz
  • Melting & Durville Casting@¨@Elimination of nternal defects
  • Hot Forging or Extrusion@¨@Refining and uniform dispersion of Ni2Si compounds
  • Solution Treatment@¨@Rapid quenching
  • Aging@¨@Precipitation hardening and increase of electrical conductivity
 
yMacrostructures of NC50z yMicrostructures of NC50z
Macrostructures of NC50
Fig.1
NC50, hot forged round bar, 160mm diameter.
Microstructures of NC50
Fig.2
NC25, hot forged plate, as aged
   
 
  Conductivity-strength-map
 
Conductivity-strength-map

Reference: KOBE STEEL ENGINEERING REPORTS/Vol. 54 No. 1 (Apr. 2004)
 
 
 
 
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YAMATOGOKIN.CO. LTD.
474,Kamitome,Miyoshi-machi,Iruma-gun,Saitama,354-0045 Japan,
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MIYOSHIGOKINKOGYO CO. LTD.
508 Kamitome,Miyoshi-machi,Iruma-gun,Saitama-ken, 354-0045 Japan
Phone : 81-49-258-3381 FAX : 81-49-258-5279

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