Using hardness conversion tables estimate the hardness and tensile strength values for the hardness readings completed in lab 2. Plot all of the HB3000/10 data for all tests and comment on the relative hardness/strength of the materials tested and the influence of cold working and heat treatment on the strength of the various material families. 3. Comment on hardness testing factors that will lead to inaccurate hardness test measurements 4. Comment on the when it is most appropriate to use Rockwell Hardness, Brinell Hardness and Vickers Microhardness testing methods to determine the hardness of a material. 5. Comment on the 'accuracy' of the various hardness conversion tables and the use of hardness to estimate the strength of steels Background Brinell Hardness Testing Procedures 1. Check to make sure that the weights on the machine are correct for the hardness test you wish to perform 2. Place a piece of material onto the machine. The bottom surface of your sample must be perfectly flat. 3. Turn the wheel clockwise until it clicks into place 4. Press start. The machine will perform the test. It is done when the green light goes out 5. Turn the wheel counterclockwise to remove the material