Regarding dissimilar steels
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The “Code for Fixed Containers” does not provide any specifications regarding joints made of different steel types. What kinds of steel are used in such joints? Thank you
We classify according to the NB/T47015 steel grade classification table
This post was last edited by xlxuiin on 2016-12-7 09:50. NB 47014~47016 – Welding procedure qualification for pressure equipment, welding regulations, performance testing of welded specimens. Material joints between different steel grade categories (not groups) – dissimilar steel joints. The categories are: Fe-1 to Fe-10
Determining whether it is a dissimilar steel alloy: Here are some examples: Q245R+Q345R, Q345R+20MnMo, Q345R+Cr-Mo. None of the above are considered dissimilar steel alloys; Q345R+S31608 is a dissimilar steel alloy
It should be weld procedure qualification. The above is what the official source provides!
Let me talk about what I’ve seen: different grades of steel as per NB/T47015 refer to those steel grades that fall into different categories (with the exception of those that can be covered by welding procedure qualification)； For reference only.