UNS S44626 (XM-33) Stainless Steel
S44626 stainless steel is a ferritic stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. XM-33 is the ASTM designation for this material. S44626 is the UNS number.
It has a moderately low thermal conductivity among wrought ferritic stainless steels. In addition, it has a moderately high base cost and a moderately high embodied energy.
The graph bars on the material properties cards below compare S44626 stainless steel to: wrought ferritic stainless steels (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Brinell Hardness
190
Elastic (Young's, Tensile) Modulus
200 GPa 29 x 106 psi
Elongation at Break
23 %
Fatigue Strength
230 MPa 34 x 103 psi
Poisson's Ratio
0.27
Rockwell B Hardness
83
Shear Modulus
80 GPa 12 x 106 psi
Shear Strength
340 MPa 49 x 103 psi
Tensile Strength: Ultimate (UTS)
540 MPa 78 x 103 psi
Tensile Strength: Yield (Proof)
350 MPa 50 x 103 psi
Thermal Properties
Latent Heat of Fusion
300 J/g
Maximum Temperature: Corrosion
560 °C 1040 °F
Maximum Temperature: Mechanical
1100 °C 2010 °F
Melting Completion (Liquidus)
1440 °C 2620 °F
Melting Onset (Solidus)
1390 °C 2540 °F
Specific Heat Capacity
480 J/kg-K 0.12 BTU/lb-°F
Thermal Conductivity
17 W/m-K 9.8 BTU/h-ft-°F
Thermal Expansion
11 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
2.3 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.7 % IACS
Otherwise Unclassified Properties
Base Metal Price
14 % relative
Density
7.7 g/cm3 480 lb/ft3
Embodied Carbon
2.9 kg CO2/kg material
Embodied Energy
42 MJ/kg 18 x 103 BTU/lb
Embodied Water
160 L/kg 19 gal/lb
Common Calculations
PREN (Pitting Resistance)
30
Resilience: Ultimate (Unit Rupture Work)
110 MJ/m3
Resilience: Unit (Modulus of Resilience)
300 kJ/m3
Stiffness to Weight: Axial
15 points
Stiffness to Weight: Bending
26 points
Strength to Weight: Axial
19 points
Strength to Weight: Bending
19 points
Thermal Diffusivity
4.6 mm2/s
Thermal Shock Resistance
18 points
Alloy Composition
Among wrought stainless steels, the composition of S44626 stainless steel is notable for containing a comparatively high amount of chromium (Cr) and including titanium (Ti). Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance. Titanium is used to broadly improve mechanical properties.
| Fe | 68.1 to 74.1 | |
| Cr | 25 to 27 | |
| Mo | 0.75 to 1.5 | |
| Ti | 0.2 to 1.0 | |
| Mn | 0 to 0.75 | |
| Si | 0 to 0.75 | |
| Ni | 0 to 0.5 | |
| Cu | 0 to 0.2 | |
| C | 0 to 0.060 | |
| P | 0 to 0.040 | |
| N | 0 to 0.040 | |
| S | 0 to 0.020 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
Metallic Materials: Physical, Mechanical, and Corrosion Properties, Philip A. Schweitzer, 2003
ASTM A240: Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
Welding Metallurgy of Stainless Steels, Erich Folkhard et al., 2012
ASTM A959: Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels
Corrosion of Stainless Steels, A. John Sedriks, 1996
ASM Specialty Handbook: Stainless Steels, J. R. Davis (editor), 1994
Advances in Stainless Steels, Baldev Raj et al. (editors), 2010