SAE 81B45 Properties ⚙️ (Chem., Mech. & Rankings) rev. 2022

 

In this post I'll talk about SAE 81B45. First let's describe it and then have a look at its material's properties.

What is SAE 81B45?

SAE 81B45 is a nickel-chromium-molybdenum steel (with added boron) that contains 0.45% carbon, approximately.

Application

They are used in seamless mechanical tubing.

UNS Number

G81451

Ok let's start with SAE 81B45 Chemical Composition.

Chemical Composition

C, Carbon

0.43–0.48

Mn, Manganese

0.75–1.00

P, Phosphorus max.

0.040

S, Sulfur max.

0.040

Si, Silicon

0.15–0.35

Ni, Nickel

0.20–0.40

Cr, Chromium

0.35–0.55

Mo, Molybdenum

0.08–0.15

Learn more about Chemical Composition.

Now it's the mechanical properties turn:

Yield Strength

350 - 560 MPa

Learn more about Yield Strength.

Tensile Strength

540 - 670 MPa

Learn more about Tensile Strength.

Elongation (min.)

12 - 24%.

Learn more about Elongation.

Hardness

Brinell

160 - 200

Learn more about Hardness.

Density

7.8 g/cm3.

Learn more about Density.

Elastic Modulus

190 GPa.

Learn more about Elastic Modulus.

Poisson's ratio

0.29.

Learn more about Poisson's ratio.

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 81B45 currently ranks 94 in my yield strength index. This means there are other 93 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:

References

ASTM A519 and other 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 and paste the information below into your assignment or essay:

Luz, Gelson. SAE 81B45 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. This citation format is based on MLA.