Standard Rockwell Hardness Test Blocks – ASTM E-18 and ISO 6508 use the following materials:

• Steel
• Brass
• Carbide

Superficial Rockwell Hardness Test Blocks – ASTM E-18 and ISO 6508 use such materials:

• Steel
• Brass

In tungsten carbide hardness testing Rockwell hardness of HRA is often used. HRA, named Rockwell Hardness A scale, which as the initial pressure uses 98.07N (equal to 10kgf), use a diamond pressure head with 120°cone apex angle or steel ball with 1.59, 3.18mm in diameter and then pressurized to 588.4N (equal to 60kgf).

These brass alloys are single-phase alloy, which metallurgically we call “Alpha” phase, which has a face-centred cubic structure. The solubility of zinc in copper is 32.5% at the solidus temperature of 900˚C and 30% at room temperature. The brasses used in cartridge cases are entirely alpha phase and are ideally suited to cold working having superior ductility to the copper-zinc alloys.

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