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Offshore Oil Rig
Deep well offshore drilling

Nanocrystalline/amorphous alloy coatings are the foundation for Armacor products. They form a structure very different from crystalline alloy coatings used by other similar products. In the amorphous structure, atoms are randomly placed in a continuous coating, preventing corrosion-path grain boundaries. Armacor’s low coefficient of friction amorphous metals:

  • Deliver superior wear resistance from abrasive particles in metal-to-metal contact conditions
  • Provide excellent non work-hardening machineability and outstanding resistance to cavitation
  • Offer improved corrosion resistance to oxidation and sulfidation reactions at elevated temperatures


Armacor is a proprietary alloy steel. Like stainless steel, it is iron-based. However, unlike typical stainless steels, Armacor has a unique surface structure that is created by frictional wear. Frictional wear on an Armacor surface transforms the alloys within Armacor from a crystalline to a nanocrystalline/amorphous outer layer. This metamorphically-transformed layer reduces friction with surrounding metals dramatically and is maintained throughout the life of the Armacor coating. The amorphous structure provides a unique combination of attributes that combats corrosion and erosion at elevated temperatures. Wear capabilities are enhanced because, unlike crystalline materials, Armacor nanocrystalline/amorphous products have no grain boundaries, dislocations or lattice defects to detract from their natural strength.


Onshore Drilling
Using Armacor for onshore drilling

Is the percentage of alloy content of your hardband sufficient to justify your hardbanding cost? While mild welding wire made of iron can be purchased for about $1.60 per pound, the cost for special wires that are used for handbanding tool joints are close to 10 times more expensive, or about $15.00 per pound. The extra cost comes from the addition of expensive alloys such as chromium, nickel, etc. to achieve superior hardband performance compared to using mild welding wire.

While virtually all special wire used for hardbanding costs about the same per pound, all hardbanding wires do not have the same percentage of alloy. Amacor has the highest industry percentage at 45 percent alloy. Brand X has only 17percent alloy and brand Y has even less at only 10 percent alloy. Armacor provides the best value because of its significantly higher alloy content, despite the extra cost for the alloy. It is generally accepted that the higher the percentage of alloy content, the better the performance of the hard band.

The percentage of alloy is only part of the value story. The actual alloys used can affect hardness, wear resistance and other results. For example, greater amounts of carbon may increase hardness but may also result in unacceptable brittleness. Hard facing amorphous material such as Amacor is manufactured with a minimum carbon content to minimize spalling and brittleness.

In addition, surface hardness by itself is only part of the story. Equivalent hardness of different tool joints as measured on the Rockwell C scale may produce different wear results because of different surface friction characteristics. Armacor stands alone in providing superior wear resistance with minimum surface friction compared to all competitive hard banding materials.