Steel, astm a331, 4140, 4150, 8645, or steel qq-s-637, 1117; investment casting; mil-s-22141, ic 4140, ic 8640, tensile test is not appicable, casting per mil-c-6021, class 2, grade b; brazing material is brazing alloy, qq-b-650, bcu-1; harden and temper to rockwell a73-76.5; for 1117, carburize lg. At 1575-1600 degrees f. To case depth of 0.005-0.008, oil quench, temper 30 min. To file hardness; manganese phosphate or zinc phosphate, mil-p-16232, class 1, type m or z; brazed joint will withstand an axial load of 1000 lbs. Without evidence of failure.
NSN 6320-01-631-7828
NSN 4140-00-001-1536
NSN 6650-00-629-8027
NSN 6110-00-105-9850
NSN 4140-01-328-6356
NSN 5998-01-425-9863
NSN 5965-01-241-0553
NSN 2925-01-309-5007
NSN 4140-00-652-9238
NSN 5855-01-218-3735
NSN 6685-01-501-6699
NSN 5990-00-107-7161