HAYNES® 556™ alloy - Haynes International, Inc.

OXIDATION RESISTANCEHAYNES ® 556 alloy exhibitsgood resistance to both air andcombustion gas oxidizingenvironments, and can be usedfor long-term exposure attemperatures up to 2000°F(1095°C). For exposures ofshort duration, 556 alloy can beused at higher temperatures.Comparative Oxidation Resistance in Flowing Air*MaterialX alloy556 alloyalloy 601alloy 800H446 SS316 SS1800°F (980°C) - 1008 Hours 2000°F (1095°C) - 1008 HoursMetal Loss Average Metal Affected** Metal Loss Average Metal AffectedMils µm Mils µmMils µm Mils µm0.3 8 0.9 251.5 40 2.7 700.4 10 1.1 301.0 25 2.6 650.5 15 1.3 351.2 30 2.6 650.9 25 1.8 455.4 135 7.4 1901.3 35 2.3 6013.1 335 14.5 37012.4 315 14.3 365>69.0 >1750 ConsumedSamples cycled to room temperature once-a-week* Flowing air at a velocity of 7.0 feet/minute (212.0 cm/minute) past the samples.** Metal Loss + Average Internal PenetrationMetallographic Technique used for Evaluating Environmental Tests1. Metal Loss = (A - B)/22. Average Internal Penetration = C3. Maximum Internal Penetration = D4. Average Metal Affected = ((A - B)/2) + C5. Maximum Metal Affected = ((A - B)/2) + D9HAYNES ® 556 TM alloy