Metal Testing by Metallurgical Associates, Grass Valley, California, Robert C. Helminiak - Principal Technician  and Lab Manager Metallurgical Associates
Metal Testing/Failure Analysis, Welding Tests, Certification & Evaluation

Grass Valley, California, USA
(Between Sacramento, California and Reno, Nevada)
Serving California, Nevada and Worldwide by Arrangement

Robert C. Helminiak
Principal Technician and Lab Manager
530 272-6052

Metal Hardness Testing



Most heat-treated metals have a minimum/maximum Rockwell "C" hardness range. Rockwell hardness testers have ranges from 20 to 80 Rockwell "C" and 0 to 100 Rockwell "B." The Rockwell "C" test uses a diamond tipped indenter with a 150 kg. load. Rockwell "B" uses a 1/16" ball with a 100 kg. load. The deeper the indenter sinks into the metal, the softer the metal is. A Rockwell hardness reading can be converted to an approximate tensile strength (psi) which is very useful when a tensile sample cannot be taken from the item to be tested. There are 20 plus different indenter/load ranges possible depending on the type metal and thickness. Microhardness testers are normally used on a cross-section of metal which has been case hardened to determine the depth of surface hardening. Gears and parts which need to be wear resistant on the surface and soft in the core to resist fracture keep us busy most of the time. Hardness Testing by Metallurgical Associates, Grass Valley, California, Robert C. Helminiak - Principal Technician  and Lab Manager
Our capabilities for hardness testing include Rockwell "B" and "C" testing, Rockwell superficial hardness testing for thin materials, Brinell hardness testing and Knoop/Vickers microhardness testing. We also have a Telebrineller portable hardness tester for checking the hardness of metals in the field.




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Installed June 22, 2004, Last Revised January 23, 2018 - Hosted and maintained by Don Robertson