Hard Facing for the Layman.

19 Sep 2016

Did you know Hard Facing can save you time and money for equipment repairs and help equipment last longer?

 

Whether you hardface old equipment (or new), when completed properly the result is the same: less downtime for replacing worn or broken components, fewer spare parts to inventory and longer equipment life. In short, hardfacing is a fast, easy and efficient way to make your equipment more wear resistant and keep it in the field longer-often for less money.

During the hardfacing process, a filler metal (sometimes called an alloy) is bonded to the equipment's base metal in order to obtain specific wear properties and/or dimensions. Specifically, these filler metals provide abrasion and/or impact resistance.

 

On older equipment, hardfacing can return worn parts to a nearly new condition for about 25 to 75 percent less than the cost of replacement parts. Hardfacing can also lengthen the life of surfaced parts by up to 300 percent more than non-surfaced parts, especially on newer equipment.

 

Impact wear often occurs on equipment like crusher rolls, impact hammers and impactor bars, and results from a compressive load placing high mechanical stress on the equipment. The best protection against this type of wear is to use an austenitic manganese steel (11 to 20 percent Mn) filler metal, as it offers good work hardening characteristics.

To protect against adhesive or metal-to-metal wear, which occurs from the non-lubricated friction of metal parts against one another, use a martensitic hard surfacing alloy. Austenitic manganese or cobalt-based alloys also work but they may be too soft to resist adhesive wear for as long of a period of time.

 

When equipment repeatedly encounters high temperatures and rapidly cools afterward, it can result in high-temperature wear, also called thermal fatigue or fire cracking, which leaves deep cracks in the equipment's base material. This type of wear is usually secondary, or in addition to the abrasion or impact wear equipment encounters.

 

Generally, a non-ferrous alloy is best for protecting steel surfaces subject to temperatures above 1200 degrees Fahrenheit. For those below this range, a filler metal containing chromium-carbide or a martensitic steel filler metal with 5 to 12 percent chromium is suitable.

 

Talk to us today to discuss your hard facing requirements, we have the equipment and expertise to help you save time and money.

 

 

 

 

 

 

 

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