Tough, ductile and impact resistant coating for use in extremely abrasive and erosive environments.

Hardide-T has enhanced toughness and is suitable for heavy duty applications in extremely abrasive and erosive environments where a thicker coating (typically 50 microns) is required or in applications involving shock loads where impact resistance is required.

Hardide-LT is an ultra-low temperature variant of Hardide-T produced at a significantly lower process temperature – below 370°C / 698°F. This widens the range of metals that can be coated without affecting their mechanical properties.

– Can be applied to both internal and external surfaces, including complex shapes uniformly

– Smooth, uniform as-coated surface minimises expensive grinding and finishing operations

– Easily applied to a wide range of metallic substrates including ferrous and nickel-based alloys, and most grades of stainless and carbon steels

– Applications include downhole tools, valves, flow control components, pumps, sealing and bearing surfaces, heavy duty earth-moving equipment, hydraulics, powder compaction and tool & die

– Industries served include oil and gas, aerospace, petrochemical, valves, pumps, material processing, power generation, steam and industrial gas turbines, industrial production tooling, pulp and paper processing, food manufacturing and motorsport.

Hardide Coatings’ UK and USA manufacturing sites are approved to ISO 9001 and aerospace AS 9100 certification. The UK site is also accredited to Nadcap and ISO 14001.


Microhardness [kgf/mm2] 1100 – 1600 Hv100
Coating Thickness Typically 50 microns (0.002”)

Thicker coatings can be produced, ask for details

Coating Toughness Excellent. Good resistance to thermal shock.
Strain to Fracture Higher than 0.3% (3000 microstrain)
Adhesion Tensile Bond Strength Better than 70 MPa or 10,000 psi

Under standard bond test ASTM C633-01, the Hardide coating adhesion bond has been proven to be higher than the adhesive ultimate strength of 70 MPa (10,000 psi)

Coating Composition Tungsten with nano-structured Tungsten Carbide

Does not contain Cobalt or other metal binder materials used in Cemented Carbides and thermal spray coatings

Coating Porosity < 0.5% as measured in accordance with ASTM E2109
Appearance Coating as applied is light gray

Finishes to a high metallic lustre when polished

Finishing Operations Grinding, Honing, Lapping, Polishing, Super-finishing
Surface finish As coated 0.4 – 0.6 microns Ra / 16-24 μin

Can be polished to 0.2 – 0.3 microns Ra / 8 – 12 μin

Can be super-finished to 0.02 microns Ra / 0.8 μin

Corrosion Resistance Resistant to acids, H2S and some aggressive chemicals

Passed NACE 30 day Sulphide Stress Cracking (SSC) test to NACE TM0177-2005/ASTM G39-Method B (1 bar H2S)

Passed 480 hours neutral salt spray corrosion test ASTM B117

Coating Temperature Typically 460° – 520°C / 860° – 968°F dependent on the substrate

Hardide-LT – ultra-low temperature option – below 370°C / 698°F for temperature sensitive substrates

Electrical Resistivity @ 20°C 5.5 microhm-cm
Linear Coefficient of Expansion 4.3 x 10-6 per ºC
Density @ 20ºC 19.3 (gm/cc)
Thermal Conductivity @ 20ºC 174 W/m·K
Specific Heat Capacity @ 20ºC 0.132 J/g·K