What is ASTM A508?ASTM A508 is a Specification for Quenched and Tempered Vacuum-Treated Carbon and Alloy Steel Forgings for Pressure Vessels.
CategorySteel Billets and Forgings
ScopeThis specification covers quenched and tempered vacuum-treated carbon and alloy steel forgings for pressure vessels such as those used in reactor systems. Specifically, it covers forgings for vessel closures, shells, flanges, tube sheets, rings, heads, and similar parts.
Ok let's start with ASTM A508 chemical composition.
Mn0.20 - 0.40
Ni2.8 - 3.9
Cr1.50 - 2.00
Mo0.40 - 0.60
Learn more about chemical composition.
Now it's the mechanical properties turn:
Grade 4N85 ksi (585 MPa) min.
Learn more about what is yield strength.
Grade 4N105 - 130 ksi (725 - 895 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.
Grade 4N48J avg. And 41J min. at -29°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 A508 currently ranks 17 in my yield strength index. This means there are other 16 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:
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Luz, Gelson. ASTM A508 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 ReferencesA 275/A 275M Test Method for Magnetic Particle Examination
of Steel Forgings
A 370 Test Methods and Definitions for Mechanical Testing
of Steel Products
A 388/A 388M Practice for Ultrasonic Examination of
Heavy Steel Forgings
A 788/A 788M Specification for Steel Forgings, General
A 966/A 966M Test Method for Magnetic Particle Examination
of Steel Forgings Using Alternating Current
E 208 Test Method for Conducting Drop-Weight Test to
Determine Nil-Ductility Transition Temperature of Ferritic
E 428 Practice for Fabrication and Control of Steel Reference
Blocks Used in Ultrasonic Examination