ASTM Grade HK (25Cr-20Ni, J94224) Cast Stainless Steel
Austenitic & General Stainless Steels
Property Overview
Density7.8g/cm³
Elastic Modulus200GPa
Tensile Strength500MPa
Yield Strength270MPa
Brinell Hardness150HB
Maximum Service Temperature1100°C
Chemical Composition
C
0.2 to 0.6%
CR
24 to 28%
NI
18 to 22%
MO
0 to 0.5%
MN
0 to 2.0%
SI
0 to 2.0%
P
0 to 0.040%
S
0 to 0.040%
FE
44.8 to 57.8%
Mechanical
Elastic (Young's, Tensile) Modulus
200 GPa
Elongation at Break
11 %
Fatigue Strength
150 MPa
Poisson's Ratio
0.27
Shear Modulus
79 GPa
Tensile Strength: Ultimate (UTS)
500 MPa
Tensile Strength: Yield (Proof)
270 MPa
Hardness
Brinell Hardness
150
Physical
Density
7.8 g/cm 3
Thermal
Latent Heat of Fusion
310 J/g
Maximum Temperature: Corrosion
440 °C
Maximum Temperature: Mechanical
1100 °C
Melting Completion (Liquidus)
1400 °C
Melting Onset (Solidus)
1350 °C
Specific Heat Capacity
480 J/kg-K
Thermal Conductivity
15 W/m-K
Thermal Diffusivity
3.9 mm 2 /s
Thermal Expansion
17 µm/m-K
Thermal Shock Resistance
11 points
Electrical
Electrical Conductivity: Equal Volume
2.0 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.3 % IACS
Calculated
PREN (Pitting Resistance)
27
Resilience: Ultimate (Unit Rupture Work)
48 MJ/m 3
Resilience: Unit (Modulus of Resilience)
190 kJ/m 3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
18 points
Strength to Weight: Bending
18 points
Environmental
Base Metal Price
25 % relative
Embodied Carbon
4.4 kg CO 2 /kg material
Embodied Energy
63 MJ/kg
Embodied Energy
63 MJ/kg 27 x 10 3 BTU/lb
Embodied Water
200 L/kg
Embodied Water
200 L/kg 23 gal/lb
Registered Designations & Aliases
25Cr-20NiASTM Grade HK (25Cr-20Ni, J94224) Cast Stainless SteelJ94224
Standards
ASTM A297 ASTM A297: Standard Specification for Steel Castings, Iron-Chromium and Iron-Chromium-Nickel, Heat Resistant, for General Application