Question

please make sure it is correct

If specimen A is tested using Rockwell C scale showed a value of HRC 45 while Specimen B when tested using Rockwell A scale showed a value of HRA 71.5. Specimen Bwas a cylindrical specimen with 32 mm diameter considering the corrected hardness reading, which of the following statements is true? Both A and B have the same hardness A is harder than B Om. There is no way to compare hardness values B is harder than A OP OIV

Answer 1

Sola Griven Date: 1 1 specimen A HRC 45 Specimen B HRA 71.5 To determine which specimen is harder we will Convert HRA to HRC on HRC to HRA and scale So, it will be easy one 1 bring them to to compare from Hardness Conversion Table Sted :- of A Scale Load Scale Load (6ong f Diamond Penentrations ) (150 kgf Diamond Penentration) 43.1 72.0 71.5 41.7 to, o 39.1 HRA 71.5 = San HRC 41.7

HRC 45 2 specimen A = Specimen B = HRA 71.5 = HRC 417 It is clear now than Rockwell Hardness value of specimen A is higher than specimen B. Hence, A is harder than B. i. option (II) is correct Completed