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304 / 304L
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This is the most versatile and one of the most widely applied of the 300 Series stainless steels. It has excellent forming and welding characteristics. The carefully controlled analysis of type 304 enables it to be deep drawn more severely then Types 301 and 302 without intermediate heat softening. Type 304 also has outstanding welding characteristics. Post-weld annealing is not required to restore the excellent performance of this grade in a wide variety of mildly corrosive conditions. Type 304L does not require post-weld annealing and finds extensive use in heavy gauge components, where freedom from carbide weld precipitation is often required. Corrosion Resistance: Excellent. Exceeding that of 302 in a wide variety of corrosive media including hot petroleum products and steam combustion gases. Heat Resistance: Good oxidation resistance in intermittent service to 1600 degrees F and in continuous service to 1700 degrees F. Continuous use of 304 in 800-1575 degrees F range not recommended but often performs well in temperatures fluctuating above and below this range. Type 304L is more resistant to carbide precipitation and can be used in the above temperature range. Annealing: Heat to 1850-2050 degrees F and cool rapidly. These grades cannot be hardened by thermal treatment. Welding: Excellent. All standard methods. Use Type 308 rods or electrodes. Heavy welded sections in Type 304 may require post-weld annealing for maximum corrosion resistance. This is not required if Type 304L is used.
Applications include beer barrels, bulk milk coolers, food processing equipment, fire extinguisher parts, wine storage tanks, tube kelp, chemical containers, heat exchangers, winding wire. | |||||
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