Alloy 304 (uns s30400) stainless steel pipe is a variation of the 18% chromium ¿c 8% nickel austenitic alloy, the most familiar and most frequently used alloy in the stainless steel family. This alloy may be considered for a wide variety of applications and exhibits good corrosion resistance, ease of fabrication, excellent formability, and high strength with low weight. Grade 304l, the low carbon version of 304, does not require post-weld annealing and so is extensively used in heavy gauge components (over about 6mm). Grade 304h with its higher carbon content finds application at elevated temperatures. Alloy 304h is a modification of alloy 304 in which the carbon content is controlled to a range of 0.04-0.10 to provide improved high temperature strength to parts exposed to temperatures above 800íp.The austenitic structure also gives these grades excellent toughness, even down to cryogenic All small tubes are packed in plastic bags to avoid scratches in transporting; then in wooden cases