| Abstrakt: |
The ignition-burn conditions of several ferrous metals, including AISI1025, AISI 4140, ductile iron and 304, 410, 17-4 PH, and CA15 stainless steels have been determined. The oxygen conditions involved velocities of approximately 430 meters per second (1400 feet per second) and pressures of 20 to 68 atm (300 to 1000 psig). When 1025 steel specimens were fractured in 68 atm (1000 psig), 427 mps (1400 fps) oxygen, this steel was found to ignite and burn at a nominal temperature of about 480 K (400 °F). Under similar conditions, AISI 4140 ignited at about 590 K (600 °F) and ductile cast iron ignited at a temperature of (530 K (200 °F) or less. Stainless steels (304, 17-4 PH, and CA15) ignited at about 590 K (600 °F) and 410 stainless steel, which appeared more resistant to ignition, was found to ignite at about 645 K (700 °F). The ignition temperature was observed to increase for all materials as the oxygen pressure was reduced. [ABSTRACT FROM AUTHOR] |
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