ASTM A420 Properties⚙️ (Chem., Mech. & Rankings) rev. 2022

In this post I'll talk about and give details about ASTM A420. First let's describe it and then have a look at its material's properties.

What is ASTM A420?

ASTM A420 is a Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low- Temperature Service.

Category

Steel Flanges, Fittings, Valves, and Parts

Scope

This 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.

Chemical Composition

Grade WPL6

C max.

0.30

Mn

0.50 - 1.35

P max.

0.035

S max.

0.040

Si

0.15 - 0.40

Ni max.

0.40

Cr max.

0.30

Mo max

0.12

Cu max.

0.40

Nb max.

0.02

V max.

0.08

Learn more about chemical composition.

Now it's the mechanical properties turn:

Yield Strength

Grade WPL6

35 ksi (240 MPa) min.

Learn more about what is yield strength.

Tensile Strength

Grade WPL6

60 - 85 ksi (415 - 585 MPa)

Learn more about what is tensile strength.

Elongation (min.) 4D

22% (Longitudinal).

Learn more about what is elongation.

Reduction of Area (min. %)

Not Required.

Learn more about reduction of area.

Impact Requirements

Grade WPL6

13.6J min. And 17.6J avg. At -45°C

Learn more about impact testing (charpy v notch).

Other properties:

Density

7800 - 8000 kg/m3 (around 7.9 g/cm3 or 0.285 lb/in3).

Learn more about density.

Elastic Modulus

190 GPa (27557 ksi) - 210GPa (30458 ksi).

Learn more about the Elastic Modulus.

Poisson's Ratio

0.27 – 0.30.

Learn more about the poisson ratio.

Allowable Stress

Depends on the project (And its factor of safety).

Learn more about the what is allowable stress.

My Material's Rank

While 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.

Details and PDF

Instructions:

1. Go to this page.
2. Type the name of the standard you are looking for in the search box. Tip: Don't forget to include "ASTM" as a keyword.
3. Read the details about the standard or download the PDF.

ASTM Classroom

Are you having trouble understanding the basics of ASTM?

What is the difference between Code, Standard & Specification?

This video will walk you through:

References

Citation

When 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 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 References

A 370 Test Methods and Definitions for Mechanical Testing⁣
of Steel Products⁣
A 960 Specification for Common Requirements for⁣
Wrought Steel Piping Fittings⁣