As rolled steel vs normalised

[DefenderJ]

A contractor has specififed an "as rolled" steel for the shell plates of a storage tank they are building. Specifically it is EN10025: 2004 S275JR + AR.

I am not fully up to speed with this option and I'm wondering about any pitfalls compared to plain normalised or normalising rolled plate.
This is a welded fabrication and will also be stress relieved after fabrication. Perhaps increased distortion may be encountered?

Could anyone enlighten me? Thanks

 

[metengr]

DefenderJ
If the storage tank does not have a specified minimum design metal temperature (MDMT), the as-rolled plate will be acceptable. If there is a minimum design metal temperature due to location of installation, as-rolled plate may not have the necessary minimum specified impact energy requirement for service. You need to evaluate this before accepting the material.

 

[DefenderJ]

Thanks metengr.
Have reviewed min design temperature and decided to specify normalised grades.

 

[TomEun]

The normalizing in oil and gas industries is generally required from the following conditions.

1. At low temperature : to obtain the required/higher impact energy values at the MDMT. (see API 650, 4.2.8 to 4.2.10.)
2. At corrosion cracking environment : to minimize the risk of crack.
3. At heavy wall thickness : to keep the sound/higher mechanical properties. (see API 650, 4.2.1.4, ASTM A516, 5.2, etc.)

So the final decision depends on the MDMT, thickness, corrosion environment, and others (specs, codes, etc.).

Thomas Eun