Abstract:
In this research two types of materials are investigated. The medium carbon steel alloy type AISI) 4140) which is been used internationally in military for barrel tube. The steel alloy is been use currently in Sudan and trying to replace AISI (4140). This work focused on applies mechanical test and characterization for the two materials to compare and investigated their properties. SPARK EMISSIONS SPECTROMETR (SES) is used for the chemical composition analysis according to stander ASTM E716-16. The result shows that AISI (4140) has 1.04% Chromium and 0.29 Silicon which explain the higher hardness. Two tensile tests were done at room temperature and at high temperature (650oC). The material under investigation steel AISI(4xxx) Suffer from degradation in strength from 607.3MPa at room temperature to 175.7MPa at high temperature.
