What is ASTM A890?ASTM A890 is a Specification for Castings, Iron-Chromium-Nickel-Molybdenum Corrosion- Resistant, Duplex (Austenitic/Ferritic) for General Application
ScopeThis specification covers a group of cast duplex stainless steels (austenitic/ferritic). The duplex stainless steel alloys offer a combination of enhanced mechanical properties and corrosion resistance when properly balanced in composition and properly heat treated.
Ok let's start with ASTM A890 chemical composition.
Cr24.5 - 26.5
Ni4.75 - 6.00
Mo1.75 - 2.25
Cu2.75 - 3.25
Learn more about chemical composition.
Now it's the mechanical properties turn:
Grade CD4MCu (Non mandatory)70 ksi (485 MPa) min.
Learn more about what is yield strength.
Grade CD4MCu (Non mandatory)100 ksi (690 MPa) min.
Learn more about what is tensile strength.
Elongation (min.) 50 mm0.16.
Learn more about what is elongation.
Reduction of Area (min. %)Not Required.
Learn more about reduction of area.
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 A890 currently ranks 29 in my yield strength index. This means there are other 28 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 A890 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 Products2
A 732/A732M Specification for Castings, Investment, Carbon
and Low-Alloy Steel for General Application, and
Cobalt Alloy for High Strength at Elevated Temperatures3
A 781/A781M Specification for Castings, Steel and Alloy,
Common Requirements, for General Industrial Use3
E 29 Practice for Using Significant Digits in Test Data to
Determine Conformance With Specifications4
E 562 Practice for Determining Volume Fraction by Systematic
Manual Point Count5
E 1245 Practice for Determining the Inclusion or Second-
Phase Constituent Content of Metals by Automatic Image