Purpose This specification covers steel cleanliness requirements in inch/pound units for aircraft-quality@ ferro-magnetic@ hardenable@ corrosion-resistant steels as determined by magnetic particle inspection methods. This specification contains sampling@ specimen preparation@ and inspection procedures and cleanliness rating criteria (See 8.2). The metric version@ MAM2303@ has been cancelled. The SI units have been included in this specification@ but the inchpound units are primary (See 8.5). Application This procedure has been used typically for the cleanliness evaluation of blooms@ billets@ tube rounds@ stock for forging or flash welded rings@ slabs@ bars@ sheet@ strip@ plate@ tubing@ and extrusions used in fabricating parts subject to magnetic particle inspection@ but may be used for qualification of a heat@ melt@ or lot of steel.