What is ASTM A420?ASTM A420 is a Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low- Temperature Service.
CategorySteel Flanges, Fittings, Valves, and Parts
ScopeThis specification covers wrought carbon steel and alloy steel fittings of seamless and welded construction. These fittings are for use in pressure piping and pressure vessel service at low temperatures.
Ok let's start with ASTM A420 chemical composition.
Mn0.50 - 1.35
Si0.15 - 0.40
Learn more about chemical composition.
Now it's the mechanical properties turn:
Grade WPL635 ksi (240 MPa) min.
Learn more about what is yield strength.
Grade WPL660 - 85 ksi (415 - 585 MPa)
Learn more about what is tensile strength.
Elongation (min.) 4D22% (Longitudinal).
Learn more about what is elongation.
Reduction of Area (min. %)Not Required.
Learn more about reduction of area.
Grade WPL613.6J min. And 17.6J avg. At -45°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 A420 currently ranks 95 in my yield strength index. This means there are other 94 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 A420 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 370 Test Methods and Definitions for Mechanical Testing
of Steel Products
A 960 Specification for Common Requirements for
Wrought Steel Piping Fittings