D.K. Garba, A.U. Alhajib & O.F. Agboola
Nigerian Steel 65 Mn (NST 65 Mn) was used as a base material for the development of High Impact Resisting Material. Two new materials, New Material 1 (NM 1) and New Material 2 (NM 2) were developed by increasing the alloy content of manganese, chromium and Nickel in the base material using master alloys. Chemical analysis was carried out according to ASTM E 572-02a (2006) e2. Mechanical Tests were also conducted as specified by ASTM A 370, E 8, E 10, E 18 and E 23using standard samples and equipment. The tests were conducted per sample and results averaged. NST 65 Mn Steel was found to have Rockwell Hardness Value of 84.8 HRB, Impact Strength of 70 Joules, and Tensile Strength of 551.6 N/mm2 . NM 1 was found to have Rockwell Hardness Value of 125 HRB, Impact Strength of 111 Joules, and Tensile Strength of 1,744 N/mm2 . NM 2was found to have Rockwell Hardness Value of 114 HRB, Impact Strength of 73 Joules, and Tensile Strength of 1,317 N/mm2 . The mechanical tests conducted on Armoured Tank Panel (ATP) in previous research sited revealed that it has Rockwell Hardness Value of 117 HRB, Impact Strength of 109 Joules, and Tensile Strength of 1,420 N/mm2 . The results showed that the NM 1is better in mechanical properties than NST 65 Mn Steel, NM 2 and ATP. The New Material 2 is better than NST 65 Mn steel in but less than the ATP. The results established that New Material 1 can be used as a material for High Impact Resistance and therefore the potentials of NST 65 Mn Steel as base material is high.