What is ASTM A437?ASTM A437 is a Specification for Stainless and Alloy-Steel Turbine-Type Bolting Specially Heat Treated for High-Temperature Service.
CategoryCorrosion-Resisting and Heat-Resisting Steels
ScopeThis specification covers stainless and alloy-steel bolting specially heat treated for high-temperature service, such as steam turbine, gas turbine, and similar uses.
Ok let's start with ASTM A437 chemical composition.
C0.20 - 0.25
Mn0.50 - 1.00
Si0.20 - 0.50
Ni0.50 - 1.00
Cr11.0 - 12.5
Mo0.90 - 1.25
W0.90 - 1.25
Learn more about chemical composition.
Now it's the mechanical properties turn:
Grade B4B105 ksi (720 MPa) min
Learn more about what is yield strength.
Grade B4B145 ksi (1000 MPa) min.
Learn more about what is tensile strength.
Elongation (min.) 50 mm0.13.
Learn more about what is elongation.
Reduction of Area (min. %)0.3.
Learn more about reduction of area.
B4B Bolts331 HB max.
Learn more about what is hardness.
Grade B4B14J min. At room temperature
Learn more about impact testing (charpy v notch).
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 A437 currently ranks 7 in my yield strength index. This means there are other 6 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 A437 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 ReferencesA962/A962M Specification for Common Requirements for
Bolting Intended for Use at Any Temperature from Cryogenic
to the Creep Range
E292 Test Methods for Conducting Time-for-Rupture Notch
Tension Tests of Materials
E112 Test Methods for Determining Average Grain Size