Scraper Blades
These blades are used as conveyor belt scrapers, and are made from four basic grades of tungsten carbide, which are tailor-made to provide excellent performance in specific applications. Careful specification of tungsten carbide grain size, cobalt, nickel and chromium binder percentages allow optimisation of corrosion, erosion and abrasion performance for different environments commonly found in mining and other related industries. Dimensional control is excellent.
TUNGSTEN-CARBIDE SCRAPER BLADE SELECTION GUIDELINES
Introduction to succesful grade selection
Ultramat SA is able to supply extruded carbide conveyor-belt scraper blades made from any of the more than 30 standard-production hardmetal grades produced by its suppliers. In the experience of its principal supplier, who exports in excess of 5000 tons per year of tungsten carbide products worldwide, by far the great majority of scraper applications throughout the world can be successfully covered by one of a short list of standard grades, detailed below.
Operating Conditions and Wear Mechanism
The key to successful selection of an appropriate carbide hardmetal grade is accurate identification of the actual mechanism of wear or failure of existing material. Broadly, failure types can be classified into three types, namely fracture, wear and corrosion. Wear (erosion/abrasion) and corrosion often occurs hand-in-hand in damp or wet environments, typical of conveyor applications.
| Ultramat® Grade |
ISO grade
(or equiv) |
WC size
(μm) |
Binder
Type |
Fracture (High impact) |
conveyor applications
Dry Erosion/Abrasion |
Wet Erosion/Corrosion |
| Grain fracture |
Binder extrusion |
Neutral pH |
Mildly acidic |
Strongly acidic |
UK20R
(economy) |
K20/
K30 |
0.8-4 |
Co (+TiC TaC NbC VC) |
|
|
|
|
|
|
UK20 |
K20/ K30 |
1-4 |
Co |
|
|
|
|
|
|
UU20 |
K20 |
0.7-0.9 |
Co (+VC/ Cr2C3) |
|
|
|
|
|
|
UU12M |
DZ10 |
0.7-0.9 |
Co+Cr+Ni |
|
|
|
|
|
|
UF10N |
|
0.7-0.9 |
Ni |
|
|
|
|
|
|
TECHNICAL SUPPORT
It is Ultramat SA's intention to provide the highest level of specialised technical support to its customers at all times. Ultramat SA partners with experienced and capable organisations in order to ensure that the customer benefits from our comprehensive cost-effective solutions to scraper blade applications. Please contact UMSA directly or its partners for laboratory analysis or technical guidance on any material/process-related issues.
 Download Tungsten-Carbide Scraper Blade Selection Guidelines (88kb)
|
