Tender For supply of optical system of metallurgical microscope (2 x 3) ft , sample preparation (2 x 3) ft , procedure of rockwell hardness tester (2 x 3) ft , iron/carbon alloy phase diagram (3 x 4) ft , schematic of brinell hardness test (2 x 3) ft , see , cupping test (2 x 3) ft , spark streams of carbon steel in carbon range of 0.3% to 0.7% (2 x 3) ft , microstructures of plain carbon steel (2 x 3) ft