Tungsten Carbide Specification Checklist

Supplier:                                   

Supplier Representative:                                 

Grade/Lot:                  

Supplier ID:                     

Customer ID:                          

Chemical components

*All new material?

*Tungsten Carbide WC %

*Cobalt Co  %

*Other                                          

Titanium Carbide TiC  %

Iron Fe  %

Vanadium Carbide VC  %

Tantalum Carbide TaC  %

Nickel Ni  %

Chromium carbide Cr3C2 %

Niobium Carbide NbC %

Physical properties – Not all of these are important in every application

Actual Density g:  

Hardness (Ra):  

Abrasion resistance: 

Transverse Rupture Strength 

Tensile strength

Impact strength

Fracture toughness

Corrosion resistance

Total Binder %

Theoretical Density:          

Young’s modulus of elasticity 

Poisson’s ratio 

Compressive strength 

Fatigue strength 

Thermal Expansion coefficient

Thermal conductivity 

Thermal capacity  

Magnetic coercive force

Magnetic permeability

Magnetic Saturation (Ms)

Electrical Resistivity

Quality of manufacture - Microscopic examination – 1500x

Porosity – holes in the material

A  Under 10 microns 

B  10 – 25 microns

C Over 25 microns

Binder Lakes

Clusters – oversize carbide grains – low levels are not considered harmful

Number of Clusters                        

Maximum allowable cluster size microns

Largest Grain  microns

Contamination – Foreign materials 

(longest axis ______ microns

Pits (0.25in2)   voids 25 to 100 microns

Eta Phase - carbon deficient, brittle areas 

none present

Some eta phase but does not effect performance 

Unusable 

Binder lakes – large areas of binder 

Other

Grade contamination

Size variance of finished parts

Cracks

Chips

Finished Product Condition 

As sintered

Sandblasted

Washed – water rinse

Washed – basic solution to saponify oils and greases 

Dust free

Tumbled 

Tuffco Surface treated