|   AISI Type P4 Mold Steel, air cooled from 955°C, tempered at 425°C  Subcategory: Tool Steel; Special-Purpose Steel; Mold Steel; Metal Close Analogs: AISI Type P6, AISI Type P20 Key Words: UNS T51604 (Obsolete); ASTM A681(94) P4 Material Notes: Low carbon content and very low hardness help facilitate cold hubbing process.  Iron content in composition calcualted as remainder.
 
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    | DensityHardness, KnoopHardness, Rockwell CHardness, VickersTensile Strength, UltimateTensile Strength, YieldElongation at BreakBulk ModulusCharpy Impact
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    | Property Data |  
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