What is ASTM A268?ASTM A268 is a Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service.
CategoryCorrosion-Resisting and Heat-Resisting Steels
ScopeThis specification covers a number of grades of nominal-wall-thickness, stainless steel tubing for general corrosion-resisting and high-temperature service. Most of these grades are commonly known as the “straight-chromium” types and are characterized by being ferromagnetic.
Ok let's start with ASTM A268 chemical composition.
Cr11.5 - 13.5
Learn more about chemical composition.
Now it's the mechanical properties turn:
TP41030 ksi (205 MPa) min
Learn more about what is yield strength.
TP41060 ksi (415 MPa) min.
Learn more about what is tensile strength.
Elongation (min.) 50 mm0.2.
Learn more about what is elongation.
Reduction of Area (min. %)Not Required.
Learn more about reduction of area.
TP410207 HB or 95 HRB max.
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 A268 currently ranks 112 in my yield strength index. This means there are other 111 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 A268 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 ReferencesA480/A480M Specification for General Requirements for
Flat-Rolled Stainless and Heat-Resisting Steel Plate,
Sheet, and Strip
A763 Practices for Detecting Susceptibility to Intergranular
Attack in Ferritic Stainless Steels
A1016/A1016M Specification for General Requirements for
Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless
E213 Practice for Ultrasonic Testing of Metal Pipe and
E273 Practice for Ultrasonic Testing of the Weld Zone of
Welded Pipe and Tubing