AISI 304 (L) austenitic stainless steel delivered in the solution annealed condition
AISI 304 (L) UNS S30400, ASTM A182, ASTM A276, ASTM A479, BS EN 10088)
NACE MR-0175/ISO 15156
Austenitic stainless steel delivered in the solution annealed condition. Also stocked in H grade (high carbon variant typically used at higher temperatures). UNS S30409.
304 is used where good corrosion resistance is required up to a temperature of approximately 870 degrees centigrade. As long as service exposure is intermittent. If continuous exposure is required then 304L is recommended instead due to the grade’s resistance to carbide precipitation. Where high strength is also required at increased temperatures up to 800 degrees maximum, 304H is preferred for use. 304H is used for high or low temperature applications and for fasteners.
Mechanical Properties Condition:
Solution annealed at around 1050ºC and water quenched.