钢筋、锻件、机械管材和锻坯0.80Cr-1.8Ni-0.25Mo（0.49-0.55C

This specification covers an aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock.Cross Reference: AMS2251,AMS2253,AMS2259,AMS2301,AMS2370,AMS2372,AMS2806,AMS2808,AS1182,ASTMA255,ASTMA370,ASTME112,ASTME350,ASTME381,ASTME384