SAE 8740 Properties (Chem., Mech. & Rankings) 2022


In this post I'll talk about SAE 8740. First let's describe it and then have a look at its material's properties.

What is SAE 8740?

SAE 8740 is a nickel-chromium-molybdenum steel that contains 0.40% carbon, approximately.


They are used in seamless mechanical tubing.

UNS Number


Ok let's start with SAE 8740 Chemical Composition.

Chemical Composition

C, Carbon


Mn, Manganese


P, Phosphorus max.


S, Sulfur max.


Si, Silicon


Ni, Nickel


Cr, Chromium


Mo, Molybdenum


Learn more about Chemical Composition.

Now it's the mechanical properties turn:

Yield Strength

380 - 570 MPa

Learn more about Yield Strength.

Tensile Strength

580 - 670 MPa

Learn more about Tensile Strength.

Elongation (min.)

11 - 23%.

Learn more about Elongation.



170 - 200

Learn more about Hardness.


7.8 g/cm3.

Learn more about Density.

Elastic Modulus

190 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.

My Material's Ranking Research

While engineers will often look for the cheapest material they can use, I took a different approach to material's selection to help newbie students.

I ranked materials according to their yield strengths and SAE 8740 currently ranks 64 in my yield strength index. This means there are other 63 materials that are more resistant.

Note: I've analysed 162 materials in order to create an yield strength index. Check my material's comparison post for more details.

SAE Classroom

Are you having trouble understanding the basics of SAE?

What is SAE: Classification and specification?

This video will walk you through:


ASTM A519 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. SAE 8740 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

DIN 1.6546 UNI 40 NiCrMo 2 KB B.S. Type 7 AMS 6322 AMS 6322F AMS 6323⁣
AMS 6323D AMS 6325 AMS 6325D AMS 6327D AMS 6358 AMS 6358B⁣
ASTM A322 ASTM A331 ASTM A505 ASTM A519 SAE J770 SAE J412⁣
AMS 6327 MIL SPEC MIL-S-6049 AMS 7496 ASTM A29 ASTM A752 MIL S-6049⁣
SAE J1397 ASTM A320 (L7C, L73) SAE J404⁣


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Materials: SAE 8740 Properties (Chem., Mech. & Rankings) 2022
SAE 8740 Properties (Chem., Mech. & Rankings) 2022
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