What is ASTM A739?ASTM A739 is a Specification for Steel Bars, Alloy, Hot-Wrought, for Elevated Temperature or Pressure- Containing Parts, or Both.
ScopeThis specification covers hot-wrought, ferritic alloy steel bars for elevated temperature or pressure-containing parts suitable for fusion welding or both.
Ok let's start with ASTM A739 chemical composition.
C0.05 - 0.15
Mn0.30 - 0.60
Cr2.00 - 2.50
Mo0.90 - 1.10
Learn more about chemical composition.
Now it's the mechanical properties turn:
Grade B2245.0 ksi (310 MPa) min.
Learn more about what is yield strength.
Grade B2275.0 - 95.0 ksi (517 - 655 MPa)
Learn more about what is tensile strength.
Elongation (min.) 50 mm0.18.
Learn more about what is elongation.
Reduction of Area (min. %)0.45.
Learn more about reduction of area.
Density7800 - 8000 kg/m3 (around 7.9 g/cm3 or 0.285 lb/in3).
Learn more about density.
Elastic Modulus190 GPa (27557 ksi) - 210GPa (30458 ksi).
Learn more about the Elastic Modulus.
Poisson's Ratio0.27 – 0.30.
Learn more about the poisson ratio.
Allowable StressDepends on the project (And its factor of safety).
Learn more about the what is allowable stress.
My Material's RankWhile 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 A739 currently ranks 62 in my yield strength index. This means there are other 61 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.
ASTM ClassroomAre you having trouble understanding the basics of ASTM?
What is the difference between Code, Standard & Specification?
This video will walk you through:
CitationWhen 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 A739 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 ReferencesA29/A29M Specification for Steel Bars, Carbon and Alloy,
Hot-Wrought, General Requirements for
A370 Test Methods and Definitions for Mechanical Testing
of Steel Products