At Certified Heat Treating, each and every lot of thermally processed products is subject to final audit testing in accordance with customer sampling plans, case depth, and hardness test requirements. These tests, conducted in our metallurgical laboratory using calibrated equipment, include:

• Rockwell hardness testing, scales A, B, and C
• Superficial hardness testing, 30N–15N
• Brinell hardness testing
• Micro hardness testing, using Vickers, Knoop
• General microstructure evaluation and photography
• Grain size determination
• Retained austenite comparative measurements
• Carbide morphology and percentages
• Grain boundary oxidation severity and depth measurements
• Case depth determination, using Vickers, Knoop