AISI 431 Properties (Chem., Mech. & Rankings) 2022


In this post I'll talk about AISI 431. First let's describe it and then have a look at its material's properties.

What is AISI 431?

AISI 431 is the most corrosion resistant of the martensitic grades. It also has excellent tensile and torque strength and good toughness.


Structural parts (that are exposed to marine atmosphere), aircraft fasteners and fittings.

UNS Number


Ok let's start with AISI 431 Chemical Composition.

Chemical Composition

C, Carbon max.


Mn, Manganese max.


P, Phosphorus max.


S, Sulfur max.


Si, Silicon max.


Cr, Chromium


Ni, Nickel


Learn more about Chemical Composition.


285 HBW

Learn more about Hardness.


7.7 g/cm3, 7700 kg/m3.

Learn more about Density.

Elastic Modulus

200 GPa.

Learn more about Elastic Modulus.

Poisson's ratio


Learn more about Poisson's ratio.

Allowable Stress or Factor of Safety

Depends on the project (And its factor of safety).

Learn more about Allowable Stress or Factor of Safety.

AISI Classroom

Are you having trouble understanding the basics of AISI?

What is AISI: Classification and specification?

This video will walk you through:


ASTM A240 and other references.


When you need to include a fact or piece of information in an assignment or essay you should also include where and how you found that piece of information.

That gives credibility to your paper and it is sometimes required in higher education.

To make your life (and citation) easier just copy and paste the information below into your assignment or essay:

Luz, Gelson. AISI 431 Properties (Chem., Mech. & Rankings). Materials Blog. dd mmmm. yyyy. URL

Now replace dd, mmmm and yyyy with the day, month, and year you browsed this page. Also replace URL for the actual url of this page. This citation format is based on MLA.

Equivalent Specifications

ASTM A276 - ASME SA276 ASTM A478 - ASME A478 ASTM A314 - ASME SA314 ASTM A484 - ASME SA484 ASTM A580 - ASME SA580 BS 7S80 BS 970; 431S29 EN57 UNS S43100 DMS-1565


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Materials: AISI 431 Properties (Chem., Mech. & Rankings) 2022
AISI 431 Properties (Chem., Mech. & Rankings) 2022
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