SAE-AISI P21 (T51621) Low-Carbon Mould Steel
Tool Steels
Property Overview
Density7.9g/cm³
Elastic Modulus190GPa
Tensile Strength1130MPa
Yield StrengthUnknown
Brinell HardnessUnknown
Maximum Service TemperatureUnknown
Chemical Composition
C
0.18 to 0.22%
CR
0 to 0.5%
NI
3.9 to 4.3%
MN
0.35 to 0.72%
SI
0.2 to 0.4%
P
0 to 0.030%
S
0 to 0.030%
CU
0 to 0.25%
V
0.15 to 0.25%
CO
1.1 to 1.3%
FE
92.1 to 94.2%
Mechanical
Elastic (Young's, Tensile) Modulus
190 GPa
Poisson's Ratio
0.29
Shear Modulus
73 GPa
Tensile Strength: Ultimate (UTS)
1130 MPa
Hardness
Rockwell C Hardness
35
Physical
Density
7.9 g/cm 3
Thermal
Latent Heat of Fusion
250 J/g
Melting Completion (Liquidus)
1450 °C
Melting Onset (Solidus)
1410 °C
Specific Heat Capacity
470 J/kg-K
Thermal Conductivity
41 W/m-K
Thermal Diffusivity
11 mm 2 /s
Thermal Expansion
12 µm/m-K
Thermal Shock Resistance
37 points
Electrical
Electrical Conductivity: Equal Volume
7.9 % IACS
Electrical Conductivity: Equal Weight (Specific)
9.0 % IACS
Calculated
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
40 points
Strength to Weight: Bending
31 points
Environmental
Base Metal Price
6.5 % relative
Embodied Carbon
2.3 kg CO 2 /kg material
Embodied Energy
32 MJ/kg
Embodied Energy
32 MJ/kg 14 x 10 3 BTU/lb
Embodied Water
62 L/kg
Embodied Water
62 L/kg 7.4 gal/lb
Registered Designations & Aliases
SAE-AISI P21 (T51621) Low-Carbon Mould SteelT51621
Standards
ASTM A681 ASTM A681: Standard Specification for Tool Steels Alloy
ASTM A681 ASTM A681: Standard Specification for Tool Steels Alloy Tool Steels, 5th ed., George Roberts et al., 1998 Tool Steels: Properties and Performance, Rafael A. Mesquita (editor), 2016