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Solution Annealed (+AT) 1.4301 Stainless Steel

EN 1.4301 +AT steel is EN 1.4301 stainless steel in the solution annealed (AT) condition. It has the lowest strength and highest ductility compared to the other variants of EN 1.4301 stainless steel.

The graph bars on the material properties cards below compare EN 1.4301 +AT steel to: wrought austenitic 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

46 %

Fatigue Strength

200 MPa 29 x 103 psi

Impact Strength: V-Notched Charpy

94 J 69 ft-lb

Poisson's Ratio

0.28

Shear Modulus

77 GPa 11 x 106 psi

Shear Strength

430 MPa 62 x 103 psi

Tensile Strength: Ultimate (UTS)

610 MPa 88 x 103 psi

Tensile Strength: Yield (Proof)

220 MPa 32 x 103 psi

Thermal Properties

Latent Heat of Fusion

290 J/g

Maximum Temperature: Corrosion

420 °C 780 °F

Maximum Temperature: Mechanical

940 °C 1730 °F

Melting Completion (Liquidus)

1430 °C 2600 °F

Melting Onset (Solidus)

1380 °C 2520 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

15 W/m-K 8.7 BTU/h-ft-°F

Thermal Expansion

16 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.4 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.7 % IACS

Otherwise Unclassified Properties

Base Metal Price

15 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

3.0 kg CO2/kg material

Embodied Energy

43 MJ/kg 18 x 103 BTU/lb

Embodied Water

140 L/kg 17 gal/lb

Common Calculations

PREN (Pitting Resistance)

19

Resilience: Ultimate (Unit Rupture Work)

220 MJ/m3

Resilience: Unit (Modulus of Resilience)

120 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

22 points

Strength to Weight: Bending

20 points

Thermal Diffusivity

4.0 mm2/s

Thermal Shock Resistance

14 points

Alloy Composition

Iron (Fe)Fe 66.8 to 74.5
Chromium (Cr)Cr 17.5 to 19.5
Nickel (Ni)Ni 8.0 to 10.5
Manganese (Mn)Mn 0 to 2.0
Silicon (Si)Si 0 to 1.0
Nitrogen (N)N 0 to 0.1
Carbon (C)C 0 to 0.070
Phosphorus (P)P 0 to 0.045
Sulfur (S)S 0 to 0.015

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

Followup Questions

Further Reading

EN 10222-5: Steel forgings for pressure purposes - Part 5: Martensitic, austenitic and austenitic-ferritic stainless steels

EN 10272: Stainless steel bars for pressure purposes

EN 10250-4: Open die steel forgings for general engineering purposes - Part 4: Stainless steels

EN 10269: Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties

EN 10088-3: Stainless steels - Part 3: Technical delivery conditions for semi-finished products, bars, rods, wire, sections and bright products of corrosion resisting steels for general purposes

EN 10088-1: Stainless steels - Part 1: List of stainless steels

Corrosion of Austenitic Stainless Steels: Mechanism, Mitigation and Monitoring, H. S. Khatak and B. Raj (editors), 2002

Austenitic Stainless Steels: Microstructure and Mechanical Properties, P. Marshall, 1984

Advances in Stainless Steels, Baldev Raj et al. (editors), 2010