Inner Casing is the Main Place of Combustion in Gas Turbines. Since the Combustion of Combustible Materials is Always Accompanied by an Increase in Volume, the Importance of the Structure in the Manufacturing Process Doubles. in the Middle of 2016, Mabnatouss Factory, with the Cooperation of Design, Engineering, Research and Development Groups and Years of Brilliant Experience in the Field of Manufacturing all Types of Gas Turbine Equipment, Launched the First Iran-Made Inner Casing in the Iranian Industrial Market. this Product was Made According to Valid Standards and Modern Engineering Methods and with the Best Possible Quality. the Increase in Volume, Temperature and Combustion in Gas Turbines Causes the Creation of Nitrogen Atoms and Nitrite Compounds in the Walls of the Chamber, which is the Main Factor in Corrosion, Erosion, Oxidation, etc. these Damages, along with various Thermal Stresses, add to the Complexity of Manufacturing this Product. therefore, with the Development of the Product, while Using Inconel 617 Material and Manufacturing Changes in the Casting Parameters and Heat Treatment, We Have been able to Reduce 90% of the Damage Caused in Inner Casing.