SAE 4130 Properties (Chem., Mech. & Rankings) 2022

 

In this post I'll talk about SAE 4130. First let's describe it and then have a look at its material's properties.

What is SAE 4130?

SAE 4130 alloy steel contains chromium and molybdenum as strengthening agents. It has low carbon content, and can be welded easily.

Application

Major applications of SAE 4130 alloy steel are in aircraft engine mounts and welded tubing.

UNS Number

G41300

Ok let's start with SAE 4130 Chemical Composition.

Chemical Composition

C, Carbon

0.28–0.33

Mn, Manganese

0.40–0.60

P, Phosphorus max.

0.040

S, Sulfur max.

0.040

Si, Silicon

0.15–0.35

Cr, Chromium

0.80–1.10

Mo, Molybdenum

0.15–0.25

Learn more about Chemical Composition.

Now it's the mechanical properties turn:

Yield Strength

Typical properties

70 ksi, 483 MPa (Hot Rolled). 85 ksi, 586 MPa (Stress Relieved). 55 ksi, 379 MPa (Annealed). 60 ksi, 414 MPa (Normalized)

Learn more about Yield Strength.

Tensile Strength

Typical properties

90 ksi, 621 MPa (Hot Rolled). 105 ksi, 724 MPa (Stress Relieved). 75 ksi, 517 MPa (Annealed). 90 ksi, 621 MPa (Normalized)

Learn more about Tensile Strength.

Elongation (min.) 50 mm typical

20% (Hot Rolled). 10% (Stress Relieved). 30% (Annealed). 20% (Normalized).

Learn more about Elongation.

Hardness

Typical Rockwell

89 HRB (Hot Rolled). 95 HRB (Stress Relieved). 81 HRB (Annealed). 89 HRB (Normalized)

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.

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 4130 currently ranks 24 in my yield strength index. This means there are other 23 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 4130 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.

Equivalent Specifications

⁣
AMS 6348 AMS 6371 ASTM A331 ASTM A829 DIN 1.7218⁣
AMS 6350 AMS 6373 ASTM A506 MIL S-18729 UNI 25 CrMo 4⁣
AMS 6351 AMS 6374 ASTM A507 MIL S-6758 JIS SCCrM 1⁣
AMS 6360 AMS 6528 ASTM A513 SAE J1397 JIS SCM 2⁣
AMS 6361 AMS 7496 ASTM A519 SAE J404 SS 2225⁣
AMS 6362 ASTM A29 ASTM A646 SAE J412 B.S. CDS 110⁣
AMS 6370 ASTM A322 ASTM A752 AFNOR 25 CD 4 (S) SAE J770⁣