AEROVAL X122MV
2Pages

■ CORROSION RESISTANCE AND SCALING TEMPERATURE ■ Scaling temperature: 650° C Best corrosion properties are achieved when material is hardened & tempered. Preheating is required for large sections. This grade should be hot worked at t° = 1000-1170°C. Slow cooling to room temperature and immediate annealing or tempering are recommended. This grade could be machined as AISI431 or AISI630 (HI100,HI150) MELTING PRACTICES This grade could be multiple melted using AOD practice followed by either vacuum or electroslag consumable electrode remelting. APPLICATIONS Standard precautions for martensitic grades should be applied in order to avoid HAZ cracking. In general, a preheating at t° = 200-300° C and a post welding tempering at 30-40°C under the tempering temperature of base metal. This post weld tempering has to be done when the weld part drops to room temperature and then has to be immediately tempered. Aircraft structural parts, gas turbine compressor components, shafts, turbine discs and high temperature bolting. DESIGNATIONS CHEMICAL COMPOSITION (chemistry shall conform to the following percentages by weight) HEAT TREATMENT (*) recommended for cold workability (**) for bars with dia.<25mm (***) double tempering is recommended (****)recommended for hardened & tempered bars subjected to cold working operations

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