What is ASTM A540?ASTM A540 is a Specification for Alloy-Steel Bolting for Special Applications.
CategorySteel Bolting Materials
ScopeThis specification covers regular and special-quality alloy steel bolting that may be used for nuclear and other special applications.
Ok let's start with ASTM A540 chemical composition.
C0.37 - 0.44
Mn0.60 - 0.95
Si0.15 - 0.35
Cr0.65 - 0.95
Ni1.55 - 2.00
Mo0.20 - 0.30
Learn more about chemical composition.
Now it's the mechanical properties turn:
Grade B23 (up to 6 in.)105 ksi min.
Learn more about what is yield strength.
Grade B23 (up to 6 in.)120 ksi
Learn more about what is tensile strength.
Elongation (min.) 50 mm0.15.
Learn more about what is elongation.
Reduction of Area (min. %)0.5.
Learn more about reduction of area.
Grade B23 (up to 6 in.)248 - 311 HB max.
Learn more about what is hardness.
Grade B23 (up to 6 in.)47J avg. 41J min. at -12.2°C
Learn more about impact testing (charpy v notch).
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 A540 currently ranks 157 in my yield strength index. This means there are other 156 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 A540 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 ReferencesA962/A962M Specification for Common Requirements for
Bolting Intended for Use at Any Temperature from Cryogenic
to the Creep Range
E45 Test Methods for Determining the Inclusion Content of