Use of 3CR12 for design of vertical storage tanks.

[Damini17]

Hi,
I am designing a hotwell tank. The client is requesting the use of 3CR12 for design of the tank as per API 650.
The standard does not cover ferritic stainless steel. Is there an equivalent material specified in API 650 that can be used to design the tank?

Thanks.

 

[JStephen]

In doing a quick google of the material, it looks like it's a cheaper alternative to some of the other stainless steels. In that case, go back to the customer and see if there are other materials that are acceptable to them. Without knowing why they picked it, it's hard to say what would be a good substitute.

 

[MJCronin]

"Without knowing why they picked it, it's hard to say what would be a good substitute"...

Agreed, modern engineering materials HAVE NO SINGLE one for one substitute.....

There have been many, many discussions on eng-tips about material choices, H2SO4 systems, storage and tanks.

Steels that are equivalent to grade 3CR12 include ASME SA240 grades, ASTM A240/A240M grades and EN 10088.2. Grade 1.4003 is also covered in EN 10028.7, which covers pressure-purpose stainless steels

Generally speaking, H2SO4 systems I have worked with have been either carbon steel (where the acid purity does not matter) or all stainless systems (where the acid purity does count)



MJCronin
Sr. Process Engineer