AISI 418 (Alloy 615, S41800) Stainless Steel
Martensitic Stainless Steels
Property Overview
Density8g/cm³
Elastic Modulus200GPa
Tensile Strength1100MPa
Yield Strength850MPa
Brinell Hardness330HB
Maximum Service Temperature770°C
Chemical Composition
C
0.15 to 0.2%
CR
12 to 14%
NI
1.8 to 2.2%
MO
0 to 0.5%
MN
0 to 0.5%
SI
0 to 0.5%
P
0 to 0.040%
S
0 to 0.030%
W
2.5 to 3.5%
FE
78.5 to 83.6%
Mechanical
Elastic (Young's, Tensile) Modulus
200 GPa
Elongation at Break
17 %
Fatigue Strength
520 MPa
Poisson's Ratio
0.28
Reduction in Area
50 %
Shear Modulus
77 GPa
Shear Strength
680 MPa
Tensile Strength: Ultimate (UTS)
1100 MPa
Tensile Strength: Yield (Proof)
850 MPa
Hardness
Brinell Hardness
330
Physical
Density
8.0 g/cm 3
Thermal
Latent Heat of Fusion
270 J/g
Maximum Temperature: Corrosion
390 °C
Maximum Temperature: Mechanical
770 °C
Melting Completion (Liquidus)
1500 °C
Melting Onset (Solidus)
1460 °C
Specific Heat Capacity
470 J/kg-K
Thermal Conductivity
25 W/m-K
Thermal Diffusivity
6.7 mm 2 /s
Thermal Expansion
10 µm/m-K
Thermal Shock Resistance
40 points
Electrical
Electrical Conductivity: Equal Volume
2.8 % IACS
Electrical Conductivity: Equal Weight (Specific)
3.1 % IACS
Calculated
PREN (Pitting Resistance)
19
Resilience: Ultimate (Unit Rupture Work)
170 MJ/m 3
Resilience: Unit (Modulus of Resilience)
1830 kJ/m 3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
38 points
Strength to Weight: Bending
29 points
Environmental
Base Metal Price
15 % relative
Embodied Carbon
2.9 kg CO 2 /kg material
Embodied Energy
41 MJ/kg
Embodied Energy
41 MJ/kg 18 x 10 3 BTU/lb
Embodied Water
110 L/kg
Embodied Water
110 L/kg 13 gal/lb
Registered Designations & Aliases
418AISI 418AISI 418 (Alloy 615, S41800) Stainless SteelAlloy 615S41800
Standards
ASTM A565 ASTM A565: Standard Specification for Martensitic Stainless Steel Bars for High-Temperature Service
ASTM A565 ASTM A565: Standard Specification for Martensitic Stainless Steel Bars for High-Temperature Service Advanced Materials in Automotive Engineering, Jason Rowe (editor), 2012 ASTM A959: Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels Properties and Selection: Irons, Steels and High Performance Alloys, ASM Handbook vol. 1, ASM International, 1993 Corrosion of Stainless Steels, A. John Sedriks, 1996
ASTM A959 ASTM A959: Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels