Is Coefficient of Friction Critical When Selecting Wear Plate?
There are a number of test values which can be helpful to determine which wear resistant steel will perform better than another, for your application.
While Some Comparison Data Is Valuable, Others Can Confuse The Issue.
Important Data For Wear Resistant Steel Includes:
• Surface Hardness – measured by a number of different scales: Rockwell, Brinell, Vickers, etc.
• Impact Resistance – measured by the Charpy Impact Test.
• Through Hardness – measured by ASTM A225, the Jominy Test compares the hardness at different depths from the surface.
One test value which may confuse your decision is the Coefficient of Friction (COF):
• COF is a number that describes how easily one surface slides against another.
• It’s a ratio of the force needed to cause sliding (frictional force) to the force pressing the surfaces together (normal force).
• There are two main types of COF:
Static – when contacting stationary surfaces just begin to move.
Kinetic – when contacting surfaces are already in motion.
As an example, the coefficient of friction for 304 stainless steels typically ranges from 0.15 to 0.45
The coefficient of friction for Chrome Carbide Overlay (CCO) plates varies depending which materials and surface conditions. Smooth CCO surfaces against steel or other CCO can be as low as 0.1, while rougher surfaces can have a coefficient of friction closer to 0.8.
The lowest recognized COF material is ice sliding on ice, with a static coefficient of friction ranging from 0.02 to 0.09.
Factors Affecting Friction:
• Material Properties: The natural properties of materials in contact, play a significant role.
• Contact Pressure: Higher pressure can increase friction.
• Temperature: Temperature can affect the properties of materials and thus influence friction.
• Surface Condition: Dry surfaces generally have higher friction than lubricated surfaces.
• Lubrication: Lubricants can significantly reduce friction.
JADCO’s CHROMEWELD ™ GLIDE is a precision-ground, polished surface with a low coefficient of friction. This minimizes material sticking or carryback and rivals the COF of 304 SS, with superior wear properties.
With 304 stainless and GLIDE having a similar COF, some might believe the two materials would last the same in sliding abrasion applications.
This Assumption Would Be Wrong
304 Stainless is well known for its widespread use in food, brewery, dairy and pharmaceutical equipment. It is ideal for kitchen appliances and cookware, because it is resistant to spills, stains and most cleaning solutions.
What Is Seldom Listed, Is Hardness, Since Stainless Is Not Designed For Wear Resistance
When you search 304 SS online for hardness, it is seldom listed. When you find it, most are 150 to 185 Brinell (HB), with a maximum of 203 HB.
CHROMEWELD ™ GLIDE is a Chrome (Cr) CARBIDE with a hardness of 1350 HV, significantly harder than 304 stainless steel.
Less Friction + High Hardness = Longer Wear Life & Less Problems
HOW DOES CHROMEWELD GLIDE ACCOMPLISH LESS WEAR?
• Reduce product hang up on chutes
• Reducing friction and premature wear
• Reduce maintenance costs
• Reduced energy consumption
• Reduce spillages around equipment
• Increase production & longer equipment life
As the leading manufacturer of Chrome Carbide Overlay (CCO) plate in the USA, you can depend on the results you get from JADCO.
Our entire CHROMEWELD family of CCO products are made at our headquarters in Harmony, PA, 30 minutes North of Pittsburgh.
To make certain we deliver the longest lasting materials for our customers, JADCO has created our own clad machines. This gives us control over every aspect in making our industry leading Chromeweld overlay plate.
Never consider the CHROMEWELD ™ family of products as a “One Size Fits All” wear plate. Our customers are always looking to us for continuous improvement. They rely upon JADCO to continually create new products, addressing their specific wear challenges.
For over 45 years, JADCO has focused exclusively on delivering consistent, longer life for our customers.
We are able to deliver better results to our customers, because we think differently. How? By strictly focusing on improving your current results.
Allow us to help you today by emailing us at info@jadcomfg.com or calling (724) 452-5252.
We will schedule a meeting with one of our local wear plate specialists at a time that best fits your schedule.
Remember, the only thing you have to lose by not working with JADCO, are your profits.
When your usual screw conveyor gives out, give JADCO a shout!
