Transverse and longitudinal material properties 1

[krishh07]

Dear All,

I herd from one client that,"Plate bending to be done to the direction of rolling of the plate" in case of manufacturing a pressure vessel.The plate was of S516Gr.70.
But as per my past experience,i never seen cutting of plates in rolling direction.Please clarify below,

1)What will be tensile,yield,elongation value difference between longitudinal specimen and transverse direction.
2)is there any chances of cracks development,in component if we will not use material in rolling direction.


mks07

 

[metengr]

thread794-119767

The transverse tensile properties will be lower in comparison to the longitudinal properties. Lower can vary based on thermal/mechanical processing history.

 

[EdStainless]

It matters, not so much with tensile strength usually,but with ductility and impact toughness there can be significant differences.
This is why many specs forbid the cutting of bar from plate.

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P.E. Metallurgy, Plymouth Tube

 

[krishh07]

Dear EdStainless,

Please, elaborate on significant differences in ductility and impact.


mks07

 

[metengr]

Typically, because of the grain orientation from rolling, the tensile elongation will be noticeably lower and the Charpy impact values will be lower in the transverse direction. You really cannot quantify how much lower because of other variables related to the type of steel and heat treatment.

Regarding bending practices, see the attached for more information

https://www.thefabricator.com/article/bending/bending-basics-the-fundamentals-of-heavy-bending

 

[EdStainless]

In most steels you see a minor difference in strength levels, unless it has been rolled after the final heat treatment. Likewise with a steel if the material has been annealed or normalized there is little visible grain elongation.
However it is very common to see significant differences in impact toughness, sometimes by a factor of 2. And different elongations and RA between L and T (don't even think about ST) are usually noticeable.

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P.E. Metallurgy, Plymouth Tube