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UNS S44627 (XM-27) Stainless Steel

S44627 stainless steel is a ferritic stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. XM-27 is the ASTM designation for this material. S44627 is the UNS number.

It has a moderately low thermal conductivity among wrought ferritic stainless steels. In addition, it has a moderately low electrical conductivity and a moderately high base cost.

The graph bars on the material properties cards below compare S44627 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

170

Elastic (Young's, Tensile) Modulus

200 GPa 29 x 106 psi

Elongation at Break

24 %

Fatigue Strength

200 MPa 29 x 103 psi

Poisson's Ratio

0.27

Reduction in Area

51 %

Rockwell B Hardness

79

Shear Modulus

80 GPa 12 x 106 psi

Shear Strength

310 MPa 46 x 103 psi

Tensile Strength: Ultimate (UTS)

490 MPa 72 x 103 psi

Tensile Strength: Yield (Proof)

300 MPa 43 x 103 psi

Thermal Properties

Latent Heat of Fusion

290 J/g

Maximum Temperature: Corrosion

470 °C 880 °F

Maximum Temperature: Mechanical

1100 °C 2010 °F

Melting Completion (Liquidus)

1440 °C 2630 °F

Melting Onset (Solidus)

1400 °C 2550 °F

Specific Heat Capacity

480 J/kg-K 0.11 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

2.2 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.6 % 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

41 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)

100 MJ/m3

Resilience: Unit (Modulus of Resilience)

220 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

18 points

Strength to Weight: Bending

18 points

Thermal Diffusivity

4.6 mm2/s

Thermal Shock Resistance

16 points

Alloy Composition

Among wrought stainless steels, the composition of S44627 stainless steel is notable for containing a comparatively high amount of chromium (Cr) and including niobium (Nb). Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance. Niobium is primarily used to improve yield strength, particularly at elevated temperatures.

Iron (Fe) 69.2 to 74.2
Chromium (Cr) 25 to 27.5
Molybdenum (Mo) 0.75 to 1.5
Nickel (Ni) 0 to 0.5
Manganese (Mn) 0 to 0.4
Silicon (Si) 0 to 0.4
Niobium (Nb) 0.050 to 0.2
Copper (Cu) 0 to 0.2
Phosphorus (P) 0 to 0.020
Sulfur (S) 0 to 0.020
Nitrogen (N) 0 to 0.015
Carbon (C) 0 to 0.010

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM A479: Standard Specification for Stainless Steel Bars and Shapes for Use in Boilers and Other Pressure Vessels

ASTM A182: Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service

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

Pressure Vessels: External Pressure Technology, 2nd ed., Carl T. F. Ross, 2011

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