In this post I'll talk about SAE E4340. First let's describe it and then have a look at its material's properties.
What is SAE E4340?SAE E4340 is a nickel-chromium-molybdenum steel with approximately 0.40% carbon.
ApplicationSAE E4340 alloy steel is used in pressure vessels, piston pins, dies, bearings, gears and ordnance.
Ok let's start with SAE E4340 Chemical Composition.
P, Phosphorus max.0.025
S, Sulfur max.0.025
Learn more about Chemical Composition.
Now it's the mechanical properties turn:
Yield Strength470 MPa
Learn more about Yield Strength.
Tensile Strength745 MPa
Learn more about Tensile Strength.
Elongation (min.) 50 mm0,22.
Learn more about Elongation.
Learn more about Hardness.
Learn more about Density.
Elastic Modulus190-210 GPa.
Learn more about Elastic Modulus.
Poisson's ratio0.27 - 0.30.
Learn more about Poisson's ratio.
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 E4340 currently ranks 29 in my yield strength index. This means there are other 28 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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Equivalent SpecificationsAMS 6415 ASTM A331 ASTM A519 ASTM A752 ASTM A829
MIL S-5000 MIL S-83135 SAE J1397 SAE J404 ASTM A304
ASTM A505 SAE J770 MIL SPEC MIL-S-5000