T.O. 33B-1-1SECTION VIIDISCONTINUITIES AND THEIR MPI INDICATIONS3.7FORMATIONOFDISCONTINUITIESANDTHEIRMPIINDICATIONS.3.7.1IronandSteelManufacturingProcesses.Knowledge of iron and steel manufacturing processes is necessary to enable an inspector to interpret andevaluate magnetic particle indications. It is not possible in this manual to explain all of the processes used inthe manufacture of iron and steel parts, but a brief review will explain how some discontinuities are formed.3.7.1.1PurposeofProcessing.Iron ore is converted into metal by heating it in a furnace. When it is liquid or molten it can be poured intomolds and allowed to cool and solidify. In the molten state it is possible to remove impurities and also to addother elements to form alloys. These additions, along with other appropriate metal processing steps, impartdesirable properties to the finished metal that can make it:HarderSofterTougherStrongerEasier to machineResistant to heatResistant to corrosion3-88Change 3
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