In ASTM A36 I cannot find a single mention of the Youngs modulus of the material. It does mention the tensile strength and yield point among other things. Where is such information normally indicated in ASTM specifications?
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asked Jun 15, 2021 at 5:16
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3$\begingroup$ Elastic properties for all structural steels are pretty much the same. E = 200-210 GPa, It probably isn't in the ASTM spec because it isn't a critical parameter like minimum tensile strength etc. You don't select a grade of steel based on its Young's modulus. $\endgroup$– alephzeroJun 15, 2021 at 14:23
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$\begingroup$ @alephzero I agree with you on the range of E but there should be some definite mention of this in ASTM documents or at least the strain at yield. The Youngs modulus, is definitely an important parameter when it comes to structural design so I do not agree with you on how you define a critical parameter. $\endgroup$– Stephen JacobJun 16, 2021 at 3:55
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$\begingroup$ Unless it is high strength steel ( 100,000 psi yield ) the strain at yield is about 0.5 % = 0.2 % offset. $\endgroup$– blacksmith37Jun 16, 2021 at 23:34
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$\begingroup$ The font and the use of "yield point" suggests this is an old version, the current A 36 is 19 ( issued 2019). I am sure it will not have the modulus either. $\endgroup$– blacksmith37Jun 17, 2021 at 14:54
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$\begingroup$ @blacksmith37 Firstly, the snapshot is from the latest issue and secondly to extract the yield point using the 0.5%/0.2% offset method is impossible unless the coordinate data of the stress-strain curve is available which it is not. Please tell me if I have missed something. $\endgroup$– Stephen JacobJun 18, 2021 at 9:05
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2 Answers
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It is steel ; 30 million psi. I don't think I ever saw an ASTM spec with a modulus when I was on A 1 committee. Maybe for castirons as the modulus for them is variable.
answered Jun 15, 2021 at 14:25
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$\begingroup$ Sorry I do not know what an A1 committee is. Could you elaborate. And I think just because the modulus is variable does not mean it should not be indicated or referenced in some other ASTM specification. I thought the whole purpose of ASTM spec is to standardize the material and its properties when used for different applications. $\endgroup$ Jun 16, 2021 at 3:58
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$\begingroup$ A 1 is the ASTM steel committee , writes all the steel specs . Divided into about 15 sections ,such as plate, pipe, tube, castings, forgings and fittings, etc. I see now it is not obvious to a casual user of ASTM specs. $\endgroup$ Jun 16, 2021 at 21:02
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$\begingroup$ Or , from another perspective I voted to approve A36 twice as an ASTM spec ( every 5 years). $\endgroup$ Jun 16, 2021 at 21:11
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The information below is provided to echo Alephzero's comment.
The mechanical properties can be found easily on the web.
