What is ASTM A688?ASTM A688 is a Specification for Seamless and Welded Austenitic Stainless Steel Feedwater Heater Tubes.
ScopeThis specification covers seamless and welded austenitic stainless steel feedwater heater tubes including those bent, if specified, into the form of U-tubes for application in tubular feed-water heaters.
Ok let's start with ASTM A688 chemical composition.
Ni8.00 - 11.00
Cr18.00 - 20.00
Learn more about chemical composition.
Now it's the mechanical properties turn:
Grade 30430 ksi (205 MPa) min.
Learn more about what is yield strength.
Grade 30475 ksi (515 MPa) min.
Learn more about what is tensile strength.
Elongation (min.) 50 mm0.35.
Learn more about what is elongation.
Reduction of Area (min. %)Not Required.
Learn more about reduction of area.
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 A688 currently ranks 126 in my yield strength index. This means there are other 125 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 A688 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 ReferencesA262 Practices for Detecting Susceptibility to Intergranular
Attack in Austenitic Stainless Steels
A480/A480M Specification for General Requirements for
Flat-Rolled Stainless and Heat-Resisting Steel Plate,
Sheet, and Strip
A941 Terminology Relating to Steel, Stainless Steel, Related
Alloys, and Ferroalloys
A1016/A1016M Specification for General Requirements for
Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless
E112 Test Methods for Determining Average Grain Size