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.
ApplicationMajor applications of SAE 4130 alloy steel are in aircraft engine mounts and welded tubing.
Ok let's start with SAE 4130 Chemical Composition.
P, Phosphorus max.0.040
S, Sulfur max.0.040
Learn more about Chemical Composition.
Now it's the mechanical properties turn:
Typical properties70 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.
Typical properties90 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 typical20% (Hot Rolled). 10% (Stress Relieved). 30% (Annealed). 20% (Normalized).
Learn more about Elongation.
Typical Rockwell89 HRB (Hot Rolled). 95 HRB (Stress Relieved). 81 HRB (Annealed). 89 HRB (Normalized)
Learn more about Hardness.
Learn more about Density.
Elastic Modulus190 GPa.
Learn more about Elastic Modulus.
Learn more about Poisson's ratio.
Allowable Stress or Factor of SafetyDepends on the project (And its factor of safety).
Learn more about Allowable Stress or Factor of Safety.
My Material's Ranking ResearchWhile 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 ClassroomAre you having trouble understanding the basics of SAE?
What is SAE: Classification and specification?
This video will walk you through:
ReferencesASTM A519 and other references.
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Luz, Gelson. SAE 4130 Properties (Chem., Mech. & Rankings). Materials Blog. Gelsonluz.com. dd mmmm. yyyy. URL
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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