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AISI 430 (S43000) Stainless Steel

AISI 430 stainless steel is a ferritic stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. 430 is the AISI designation for this material. S43000 is the UNS number. Additionally, the British Standard (BS) designation is 430S15.

This material is well established: the Further Reading section below cites a number of published standards, and that list is not necessarily exhaustive.

It has a moderately low embodied energy among the wrought ferritic stainless steels in the database.

The graph bars on the material properties cards below compare AISI 430 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

160

Elastic (Young's, Tensile) Modulus

200 GPa 29 x 10⁶ psi

Elongation at Break

24 %

Fatigue Strength

180 MPa 26 x 10³ psi

Poisson's Ratio

0.28

Reduction in Area

51 %

Rockwell B Hardness

Shear Modulus

77 GPa 11 x 10⁶ psi

Shear Strength

320 MPa 47 x 10³ psi

Tensile Strength: Ultimate (UTS)

500 MPa 73 x 10³ psi

Tensile Strength: Yield (Proof)

260 MPa 37 x 10³ psi

Thermal Properties

Latent Heat of Fusion

280 J/g

Maximum Temperature: Corrosion

410 °C 770 °F

Maximum Temperature: Mechanical

870 °C 1600 °F

Melting Completion (Liquidus)

1510 °C 2750 °F

Melting Onset (Solidus)

1430 °C 2600 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

25 W/m-K 14 BTU/h-ft-°F

Thermal Expansion

10 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.9 % IACS

Electrical Conductivity: Equal Weight (Specific)

3.4 % IACS

Otherwise Unclassified Properties

Base Metal Price

8.5 % relative

Calomel Potential

-220 mV

Density

7.7 g/cm³ 480 lb/ft³

Embodied Carbon

2.1 kg CO₂/kg material

Embodied Energy

30 MJ/kg 13 x 10³ BTU/lb

Embodied Water

120 L/kg 14 gal/lb

Common Calculations

PREN (Pitting Resistance)

Resilience: Ultimate (Unit Rupture Work)

100 MJ/m³

Resilience: Unit (Modulus of Resilience)

170 kJ/m³

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

18 points

Strength to Weight: Bending

18 points

Thermal Diffusivity

6.7 mm²/s

Thermal Shock Resistance

18 points

Alloy Composition

Among wrought stainless steels, the composition of AISI 430 stainless steel is notable for containing a comparatively high amount of chromium (Cr). Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance.

Iron (Fe)Fe		79.1 to 84
Chromium (Cr)Cr		16 to 18
Manganese (Mn)Mn		0 to 1.0
Silicon (Si)Si		0 to 1.0
Nickel (Ni)Ni		0 to 0.75
Carbon (C)C		0 to 0.12
Phosphorus (P)P		0 to 0.040
Sulfur (S)S		0 to 0.030