Comparison
P265GH vs P355NH
Both are pressure vessel steels. Neither of them is S355. P265GH is the non-alloy boiler steel for elevated temperature to EN 10028-2. P355NH is normalised with higher yield strength to EN 10028-3. You switch when wall thickness or pressure makes P265GH too thick – not as a standard upgrade.
What the abbreviations mean
P is pressure. The number is the yield strength class. GH is suitability for elevated temperature. NH is normalised and suitable for elevated temperature. Certificate and standard govern the purchase as much as chemistry does.
- P265GH · 1.0425 – EN 10028-2, boilers and heat exchangers
- P355NH · 1.0565 – EN 10028-3, higher strength, normalised
- 16Mo3 · 1.5415 – when the temperature requires molybdenum
When to switch
P265GH as long as the calculation and the temperature stay in the non-alloy range. P355NH when the wall would otherwise become too thick. P355NL1 when low temperature is the requirement. 16Mo3 when Mo is required. We do not rewrite the steel as S355 on the certificate.
Documentation
3.1 as standard. 3.2 when the notified body or the end customer requires it. Order the certificate before we lock in the plate at the mill.
Frequently asked questions
- Can I use S355J2 as P265GH?
- No. S355 is structural steel. P265GH is pressure vessel steel to EN 10028. The certificate and the PED trail are different.
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Send your enquiry
State grade, dimensions and quantity — or attach a drawing. We reply with a quote.