NACE TM0177, FPBT at 90% AYS

[Mateeng]

Dear folks,
Did anybody have any issue with SSC test as per NACE TM0177 for high thickness plate more than 100 mm? The plate manufacturer is saying achieving FPBT at stresses 90% of Actual yield stress is not possible as per their experience.
This is a NACE requirement, is that possible and deviate from the 90% AYS and agreed on a lower value?
How practical and achievable is 90% AYS?

Thanks

 

[Chumpes]

hi
try to imagine the type of device needed to stress a 100mm thick steel plate sample in bending mode (4PB) up to 90%YS:
It is not practicable !! the loading device that would be used to stress your specimen would be far too hudge (and expensive) and you won't be able to immerse it into any lab TM0177 solution.

We were using loaging device for 30mm full thickness plate at maximum, these loading devices were already very big (300x150x150mm)

better use another loading configuration such as tensile SSC test (also described in TM0177) of tensile specimen sampled in the plate for 100mm thick plates.
sampled specimen can be stressed in tension by a tensile machine or by a compressed spring.

regards