Understanding the designation
The grade identifies a material family and strength classification; it does not replace an EN tube product standard or test requirements.
Writing a reliable purchasing specification
Identify seamless or welded manufacture, the relevant EN 10216-2 or EN 10217-2 product scope, dimensions and certificates.
Do similar grades mean the same thing?
P265GH and P235GH remain different material grades even when listed alongside one another in supplier offerings.