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AISI Type P4 Mold Steel, air cooled from 955°C, tempered at 425°C
Categories: Metal; Ferrous Metal; Tool Steel; Mold Steel

Material Notes: Low carbon content and very low hardness help facilitate cold hubbing process.

Key Words: UNS T51604 (Obsolete); ASTM A681(94) P4
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Physical PropertiesMetricEnglishComments
Density 7.85 g/cc0.284 lb/in³
 
Mechanical PropertiesMetricEnglishComments
Hardness, Knoop 426426Converted from Rockwell C hardness.
Hardness, Rockwell C 4242
Hardness, Vickers 410410
Tensile Strength, Ultimate 1290 MPa187000 psi
Tensile Strength, Yield 1035 MPa150100 psi
Elongation at Break 15.8 %15.8 %In 50 mm
Bulk Modulus 160 GPa23200 ksiTypical for steel
Charpy Impact 43.0 J31.7 ft-lbV-notch
 
Component Elements PropertiesMetricEnglishComments
Carbon, C <= 0.12 %<= 0.12 %
Chromium, Cr 4.0 - 5.25 %4.0 - 5.25 %
Iron, Fe 94 %94 %As remainder
Manganese, Mn 0.20 - 0.60 %0.20 - 0.60 %
Molybdenum, Mo 0.40 - 1.0 %0.40 - 1.0 %
Phosphorus, P <= 0.030 %<= 0.030 %
Silicon, Si 0.10 - 0.40 %0.10 - 0.40 %
Sulfur, S <= 0.030 %<= 0.030 %

References for this datasheet.

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MSTP4 / 74497

Specialty Compounds RTP Company

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