What is ASTM A747?ASTM A747 is a Specification for Steel Castings, Stainless, Precipitation Hardening.
ScopeThis specification covers iron-chromium-nickel copper corrosion-resistant steel castings, capable of being strengthened by precipitation hardening heat treatment.
Ok let's start with ASTM A747 chemical composition.
Cr15.50 - 17.70
Ni3.60 - 4.60
Cu2.5 - 3.20
Nb0.15 - 0.35
Learn more about chemical composition.
Now it's the mechanical properties turn:
Grade CB7Cu-1 (Supplementary H900)145 ksi (1000 MPa) min.
Learn more about what is yield strength.
Grade CB7Cu-1 (Supplementary H900)170 ksi (1170 MPa) min.
Learn more about what is tensile strength.
Elongation (min.) 51 mm0.05.
Learn more about what is elongation.
Reduction of Area (min. %)Not Required.
Learn more about reduction of area.
Grade CB7Cu-1 (Supplementary H900)375 HB min.
Learn more about what is hardness.
Density7480 - 8000 kg/m3 (around 7.9 g/cm3 or 0.285 lb/in3).
Learn more about density.
Elastic Modulus180 GPa (26107 ksi) - 210GPa (30458 ksi).
Learn more about the Elastic Modulus.
Poisson's RatioUsually around 0.26 – 0.31.
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 A747 currently ranks 4 in my yield strength index. This means there are other 3 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 A747 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 732/A 732M Specification for Castings, Investment,
Carbon and Low Alloy Steel for General Application,
and Cobalt Alloy for High Strength at Elevated Temperatures
A 781/A 781M Specification for Castings, Steel and Alloy,
Common Requirements, for General Industrial Use
E 38 Methods for Chemical Analysis of Nickel-Chromium
and Nickel-Chromium-Iron Alloys
E 353 Test Methods for Chemical Analysis of Stainless,
Heat-Resisting, Maraging, and Other Similar Chromium-