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321 and 321H stainless steel plate are basic austenitic materials. These grades are stabilized by the addition of Titanium. These grades are often utilized for applications in temperatures up to 1,650 ℉. These grades of plate combine high strength, resistance to scaling, and phase stability, with resistance to subsequent aqueous corrosion. 304L plate is more readily available in most product forms, and so is generally used in preference to 321 or 321H if the requirement is simply for resistance to intergranular corrosion after welding. However, 304L has lower heat strength than 321 and 321H plate and so may not be the best choice if the requirement is resistance to an operating environment over about 932 ℉.