ASTM a516 Gr. 70 yield strength 1

[Drake85]

Hello to everyone, greetings from Italy!

I found this website looking on the internet for an info and so far i find it awesome.
I was looking for info about the yield strength of the ASTM a516 Gr. 70. On the internet i found that the YS shown is about 38ksi (260MPa by ASTM A516/A516M-17 standard]) and it is compared to the european S355GH YS=51ksi (355MPa by EN10028-2 standard) but both have a close tensile strength.
That's quite a difference!
Now, i looked for the stress-strain curve of the above mentioned material, ad i find that the YS of the a516 seems to be much higher of 38ksi? (couldn't find exact measures though, but the graph shows the 200MPa mark way below the YS of the test).
I am looking for this info because I am in the design of a welded joint connection between a I section profile and a little pressure vessel built with this material.
If you could help me telling me were to find this info and also were to find info about welding regarding pressure vessels I would be very thankful.

Have an excellent day!

 

[Tmoose]

I believe the values of yield strength and elongation table 2 in ASTM A516 are both minimums.
In my mind higher yield strength is a bonus as long as the elongation does not suffer.

The published values of UTS, YS and elongation of many weld filler materials often exceed the AWS specifications and requirements.

AWS E71T-11 YS UTS (not min) elongation HRB
Requirements - 400 (58) min 480-655 (70-95) 20 min –
Typical Results(3) 435-475 (63-69) 605-645 (88-94) 22-25 89-92


I think I've heard on ENG-TIPS that modern structural A36 steel often significantly exceeds the ASTM A36 minimums.

 

[Drake85]

Hello Tmoose, thanks for taking the time to answer!
So ok, it is the minimum from a test, it seems that the deviation from the yield point is quite high.
How do you calculate weld strength in this case? We are used to use the yield point given by the technical legislation, so in the case of the S355 steel it would be 51ksi(355 MPa). We have a "directional method (yield stress)" and a "simplified method (tensile stress)", what method do you use?

 

[Tmoose]

"welded joint"

http://files.engineering.com/downlo...a7aa316aeb&file=D1.1_2000_Section2_Design.pdf

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Are you buying ASTM graded material for your project?
Attached are the ASTM A516 tensile values.

Otherwise I'd use the values in the Standard to which the material is certified

 

[weldstan]

The YS of SA516 70 is most often substantially greater than the the min specified. As thickness increases (generally beyond 2 inches) the YS reduces becoming closer to the minimum.

 

[Drake85]

Thanks for the answers, i am still looking to sort out the differences in welding design. I was sick the last 2 weeks and got quite bit of a headache problem that i am still investigating with my doctor, sorry for not answering before.
Hope you have nice holidays and new year.