What is ASTM A790?ASTM A790 is a Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe.
CategoryCorrosion-Resisting and Heat-Resisting Steels
ScopeThis specification covers seamless and straight-seam welded ferritic/austenitic steel pipe intended for general corrosive service, with particular emphasis on resistance to stress corrosion cracking. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures.
Ok let's start with ASTM A790 chemical composition.
Grade UNS S32750
Ni6.0 - 8.0
Cr24.0 - 26.0
Mo3.0 - 5.0
N0.24 - 0.32
Learn more about chemical composition.
Now it's the mechanical properties turn:
Grade UNS S3275080 ksi (550 MPa) min.
Learn more about what is yield strength.
Grade UNS S32750116 ksi (800 MPa) min.
Learn more about what is tensile strength.
Elongation (min.) 50 mm0.15.
Learn more about what is elongation.
Reduction of Area (min. %)Not Required.
Learn more about reduction of area.
Grade UNS S32750300 HBW or 32 HRC 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 A790 currently ranks 25 in my yield strength index. This means there are other 24 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 A790 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 ReferencesA370 Test Methods and Definitions for Mechanical Testing
of Steel Products
A923 Test Methods for Detecting Detrimental Intermetallic
Phase in Duplex Austenitic/Ferritic Stainless Steels
A941 Terminology Relating to Steel, Stainless Steel, Related
Alloys, and Ferroalloys
A999/A999M Specification for General Requirements for
Alloy and Stainless Steel Pipe
E213 Practice for Ultrasonic Testing of Metal Pipe and
E309 Practice for Eddy-Current Examination of Steel Tubular
Products Using Magnetic Saturation
E381 Method of Macroetch Testing Steel Bars, Billets,
Blooms, and Forgings
E426 Practice for Electromagnetic (Eddy-Current) Examination
of Seamless and Welded Tubular Products, Austenitic
Stainless Steel and Similar Alloys
E527 Practice for Numbering Metals and Alloys in the
Unified Numbering System (UNS)