The Rockwell hardness scale is used by all companies that produce steel products in America. No matter if the product is a ball bearing or a knife blade, the RC scale is the industry standard. Two experts in the field recommend Rockwell testing and how to carry them out. Manufacturers of steel products mention:
Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials: American Standard Test Method (ASTM E 18 Metals)
International Standards Organization – Test Method for the Rockwell Hardness Test, Part 1 (ISO 6508-1 Metallic Materials)The Rockwell hardness scale is used by all steel product makers because it enables standard reporting of test results. The Rockwell hardness scale is widely recognized in the steel industry. They can immediately determine the steel’s strength by looking at its Rockwell rating. The Rockwell system is universally accepted as a hardness baseline. That’s particularly so in knife blade manufacturing.

The Rockwell hardness range for NextGen’s Universal Hardness Tester for Vickers / Knoop, Rockwell and Brinell is 20-100HR.

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