Re: But why? The question of ASTM A312-TP321

But why they(ASTM Standard Organise) did not note this difference BEFORE, and only about TP321, but not TP304, TP316,etc.

Best Regards,

ChenYueShuang

• Original Message ----- From: "Steve McKenzie" <mechproj@xtra.co.nz> To: <PipingDesign@yahoogroups.com> Sent: Wednesday, March 17, 2004 2:03 PM Subject: RE: [PipingDesign] But why? The question of ASTM A312-TP321

> Normally the thinner the material, the higher the tensile strength. Thin
> sections material properties can be conditioned (e.g. heat treatment) more
> accurately than thick sections.
> Also there is less likelihood of built-in secondary (e.g. bending) stresses.
>
> A thin section is more flexible and can align itself more accurately to the
> applied load. This gives a higher apparent tensile strength as there is no
> induced bending.
>
> Many good "strength of materials" textbooks will give a detailed explanation
> of this perplexing but measurable phenomenon.
>
> Cheers
>
> Steve
>
>
>
> -----Original Message-----
> From: M. Tageldin [mailto:magedtag@hotmail.com]
> Sent: Wednesday, March 17, 2004 6:39 PM
> To: PipingDesign@yahoogroups.com
> Subject: Re: [PipingDesign] But why? The question of ASTM A312-TP321
>
>
> Dear Friends;
> I am not an expert in such subject, but I wanted to reform the question. How
> a material can have two different strengths depending on the thickness?. My
> knowledge tills me that strength is a constant whatever the dimensional
> changes of an element.
>
> Regards
> Maged A. Tageldin
> Sr. Mechanical Engineer
> SETE Technical Services S.A.
>
> ----- Original Message -----
> From: chenysh
> To: PipingDesign@yahoogroups.com
> Sent: Wednesday, March 17, 2004 3:39 AM
> Subject: [PipingDesign] But why? The question of ASTM A312-TP321
>
>
> Dear all experts,
> In the Standard of ASTM A312, I have a doubt about the material TP321.
> As the Standard described, The Tensile Requirement of this material, t<3/8
> in, is 75ksi; t>3/8in, is 70ksi. But in the Old Edition, there is no these
> differences.
> Who can give me a explain.
> Thanks for your any coments.
>
> regards,
>
> ChenYueshuang
>
>
>
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Received on Wed Mar 17 01:39:00 2004