ASTM A322 Properties (Chem., Mech. & Rankings) 2022

In this post I'll talk about and give details about ASTM A322. First let's describe it and then have a look at its material's properties.

What is ASTM A322?

ASTM A322 is a Specification for Steel Bars, Alloy, Standard Grades

Category

Steel Bars

Scope

This specification covers hot-wrought alloy steel bars. Bar applications include forging, heat treating, cold drawing, machining and many structural components.

Ok let's start with ASTM A322 chemical composition.

Chemical Composition

Grade 4140

C

0.38 - 0.43

Mn

0.75 - 1.00

P max.

0.035

S max.

0.040

Si

0.15 - 0.35

Cr

0.80 - 1.10

Mo

0.15 - 0.25

Learn more about chemical composition.

Now it's the mechanical properties turn:

Density

7800 - 8000 kg/m3 (around 7.9 g/cm3 or 0.285 lb/in3).

Learn more about density.

Elastic Modulus

190 GPa (27557 ksi) - 210GPa (30458 ksi).

Learn more about the Elastic Modulus.

Poisson's Ratio

0.27 – 0.30.

Learn more about the poisson ratio.

Allowable Stress

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

Learn more about the what is allowable stress.

My Material's Rank

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 ASTM A322 currently ranks 149 in my yield strength index. This means there are other 148 materials that are more resistant.

Note: I've analysed 134 materials in order to create an yield strength index. Check my astm material's comparison post for more details.

Details and PDF

Instructions:

1. Go to this page.
2. Type the name of the standard you are looking for in the search box. Tip: Don't forget to include "ASTM" as a keyword.
3. Read the details about the standard or download the PDF.

ASTM Classroom

Are you having trouble understanding the basics of ASTM?

What is the difference between Code, Standard & Specification?

This video will walk you through:

References

Citation

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 & paste the information below into your assignment or essay:

Luz, Gelson. ASTM A322 Properties (Chem., Mech. & Rankings). Materials Blog. Gelsonluz.com. 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 (The < and > stay, ok?). This citation format is based on MLA.

Other References

A 29/A 29M Specification for Steel Bars, Carbon and Alloy,⁣
Hot-Wrought and Cold-Finished, General Requirements⁣
for2⁣
A 304 Specification for Steel Bars, Alloy, Subject to End-⁣
Quench Hardenability Requirements2⁣
A 400 Practice for Steel Bars, Selection Guide, Composition,⁣
and Mechanical Properties2⁣
E 112 Test Methods for Determining Average Grain Size3⁣
E 381 Method of Macroetch Testing, Inspection, and Rating⁣
Steel Products, Comprising Bars, Billets, Blooms, and⁣
Forgings⁣