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̲ A practical example concerning the selection of alternative steel materials to substitute steel of chemical composition OXH3MΦA in a part of product subjected to high internal pressure is carried to cover mainly the effect of heat treatment on the microstructures and mechanical properties of an investigated high strength low alloy (HSLA) steels1.6580 and 1.7225. The mechanical properties and microstructure of steels material were investigated. The investigation results were compared with used steel OXH3MΦA. The desired properties have been achieved in these steels by properly designed heat treatment. The results are quite well adopted and show that the investigated steels have excellent combination of tensile strength, impact strength and ductility which is very attractive for industrial use and also it is found that, the heattreatment and steel material costs of the investigated steels were more and more less than the old used ones.

SELECTING AN ALTERNATIVE STEEL MATERIAL FOR PRODUCTS WHICH STAND HIGH INTERNAL PRESSURE