ASTM A995 Properties (Chem., Mech. & Rankings) 2022

In this post I'll talk about and give details about ASTM A995. First let's describe it and then have a look at its material's properties.

What is ASTM A995?

ASTM A995 is a Specification for Castings, Austenitic-Ferritic (Duplex) Stainless Steel, for Pressure- Containing Parts.

Category

Corrosion-Resisting and Heat-Resisting Steels

Scope

This specification covers austenitic-ferritic (duplex) stainless steel castings for valves, flanges, fittings, and other pressure-containing parts.

Ok let's start with ASTM A995 chemical composition.

Chemical Composition

Grade 4A

C max.

0.03

Mn max.

1.50

Si max.

1.00

P Max.

0.04

S max.

0.020

Cr

21 - 23.5

Ni

4.5 - 6.5

Mo

2.5 - 3.5

Cu max.

1.00

N

0.10 - 0.30

Learn more about chemical composition.

Now it's the mechanical properties turn:

Yield Strength

Grade 4A

60 ksi (415 MPa) min.

Learn more about what is yield strength.

Tensile Strength

Grade 4A

90 ksi (620 MPa) min.

Learn more about what is tensile strength.

Elongation (min.) 50 mm

0.25.

Learn more about what is elongation.

Reduction of Area (min. %)

Not Required.

Learn more about reduction of area.

Density

7480 - 8000 kg/m3 (around 7.9 g/cm3 or 0.285 lb/in3).

Learn more about density.

Elastic Modulus

180 GPa (26107 ksi) - 210GPa (30458 ksi).

Learn more about the Elastic Modulus.

Poisson's Ratio

Usually around 0.26 – 0.31.

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 A995 currently ranks 40 in my yield strength index. This means there are other 39 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 A995 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 488/A 488M Practice for Steel Castings, Welding, Qualification⁣
of Procedures and Personnel⁣
A 703/A 703M Specification for Steel Castings, General⁣
Requirements, for Pressure-Containing Parts⁣
E 125 Reference Photographs for Magnetic Particle Indications⁣
on Ferrous Castings⁣
E 165 Test Method for Liquid Penetrant Examination⁣
E 562 Test Method for Determining Volume Fraction by⁣
Systematic Manual Point Count⁣