Alloy

Colmonoy 4

Alloy Type

Nickel with Chromium Boride

Nominal Composition (%)

C 0.40
Si 2.30
Cr 10.00

 Fe 2.50
B 2.20
Ni Balance

Rockwell Hardness
(C-scale)

35-40

Density (gm/cc)

8.39

Fusing Temperature (approx.)

1925°F
1050°C

Resistance:

to
Abrasion

to

Corrosion

to
Impact

to
Galling

 

4

2

2

3

Supplied Forms

Crushed Powder, Bare Rods, Ingot

Method of application

Spraywelder, Oxyacetylene, GTAW, PTA

Description and General Uses

 

Has greater impact resistance and workability than Colmonoy 5.  For dies, molds, valves and plungers.  Finished with carbide tools and grinding. See spec. II.