UNS S44635 (25-4-4) Stainless Steel
Ferritic Stainless Steels
Property Overview
Density7.8g/cm³
Elastic Modulus210GPa
Tensile Strength710MPa
Yield Strength580MPa
Brinell Hardness240HB
Maximum Service Temperature1100°C
Chemical Composition
C
0 to 0.025%
CR
24.5 to 26%
NI
3.5 to 4.5%
MO
3.5 to 4.5%
MN
0 to 1.0%
SI
0 to 0.75%
N
0 to 0.035%
P
0 to 0.040%
S
0 to 0.030%
NB
0.2 to 0.8%
TI
0.2 to 0.8%
FE
61.5 to 68.5%
Mechanical
Elastic (Young's, Tensile) Modulus
210 GPa
Elongation at Break
23 %
Fatigue Strength
390 MPa
Poisson's Ratio
0.27
Shear Modulus
81 GPa
Shear Strength
450 MPa
Tensile Strength: Ultimate (UTS)
710 MPa
Tensile Strength: Yield (Proof)
580 MPa
Hardness
Brinell Hardness
240
Rockwell C Hardness
24
Physical
Density
7.8 g/cm 3
Thermal
Latent Heat of Fusion
300 J/g
Maximum Temperature: Corrosion
610 °C
Maximum Temperature: Mechanical
1100 °C
Melting Completion (Liquidus)
1460 °C
Melting Onset (Solidus)
1420 °C
Specific Heat Capacity
470 J/kg-K
Thermal Conductivity
16 W/m-K
Thermal Diffusivity
4.4 mm 2 /s
Thermal Expansion
11 µm/m-K
Thermal Shock Resistance
23 points
Electrical
Electrical Conductivity: Equal Volume
2.2 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.5 % IACS
Calculated
PREN (Pitting Resistance)
39
Resilience: Ultimate (Unit Rupture Work)
150 MJ/m 3
Resilience: Unit (Modulus of Resilience)
810 kJ/m 3
Stiffness to Weight: Axial
15 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
25 points
Strength to Weight: Bending
23 points
Environmental
Base Metal Price
22 % relative
Embodied Carbon
4.4 kg CO 2 /kg material
Embodied Energy
62 MJ/kg
Embodied Energy
62 MJ/kg 27 x 10 3 BTU/lb
Embodied Water
170 L/kg
Embodied Water
170 L/kg 21 gal/lb
Registered Designations & Aliases
25-4-4S44635UNS S44635 (25-4-4) Stainless Steel
Standards
ASTM A240 ASTM A240: Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
ASTM A240 ASTM A240: Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications Welding Metallurgy and Weldability of Stainless Steels, John C. Lippold and Damian J. Kotecki, 2005 ASTM A959: Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels Corrosion of Stainless Steels, A. John Sedriks, 1996
ASTM A959 ASTM A959: Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels