| GENERAL CHARACTERISTICS ITEM DESCRIPTION | 18 PCT NI MARAGING STEEL BAR PER MIL-S-46850,GRADE 250,TYPE III OR IV; FRACTURE TOUGHNESS TEST WAIVED;ALTERNATIVE MATL:INVESTMENT CSTG,18 PCT NI MARAGING STEEL PER MIL-C-47041 OR GR 250TYPE III OR IV PER MIL-S-46850 (FRACT URE TOUGHNESS TEST WAIVED);HEAT TREAT:PRECIPITATION HARDEN PER MIL-H-6875;A.BAR STOCK MATERIAL HARDNESS ROCKWELL C48 MIN,B.INVESTMENT CAST MATERIAL HARDNESS ROCKWELL C46 MIN |