Fitout Inflow Plus 355

Inflow Plus 355

Inflow Plus 355 is our high strength, multi-certified, hot-finished HFI welded pressure tube.

Inflow™ Plus 355 is our high strength, multi-certified, hot-finished HFW (High Frequency Welded) pressure tube for general purpose and industrial conveyance solutions such as HVAC, steam services, petrochemical, process plant, fire protection and wear resistance applications.

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  • Primary standard EN 10217-3 Grade P355NH.
  • Multi-certified satisfying the mechanical properties of grades in other industry referenced standards, e.g. DIN1626 St52.0N/G, DIN1628 St52.4 and DIN17178 WSt E 355.
  • Suitable substitute for equivalent hot-finished fine grain seamless tube grades e.g. DIN1629 St52.0N, DIN1630 St52.4, & DIN17179 WSt E355.
  • General engineering tube to EN 10219 Grade S355J2H (for sizes greater than, equal to OD219.1mm).
  • Fully weldable.
  • Fully killed steel produced to fine grain practice for enhanced ductility.
  • Quality designation TC1 supplied as standard.
  • Quality designation TC2 option for sizes ≥ OD219.1mm.
  • Inflow™ Plus 355 provides full PED compliance being suitable for equipment in PED categories I, II, III or IV, also aligned with AD2000 Merkblatt W4.
  • Suitable for pressure applications and temperature range -20 to +400ºC (except EN 10219).
  • OD and ID weld beads fully removed.
  • Due to the superior mechanical properties of Inflow™ Plus 355, the same pressure integrity as for Inflow™ Plus 235 can be obtained with thinner walls.
  • The associated weight savings will enable a reduction in supporting load bearing structures, hangers and brackets etc.
  • Increased wear resistance – providing improved service life for applications where this is a consideration.
  • Backed up by technical experts who can offer advice on applications and product suitability.
  • Inflow™ Plus 355 is fully technically supported with a range of available product brochures.
  • Certified to BES 6001 Responsible Sourcing standard.
  • Supplied with 3.1 inspection certification to EN 10204.
  Inflow™ Plus 355
Delivery condition
and size range
Cold N/A
Hot OD17.2 - 193.7mm
WLA (Weld Line Anneal) OD219.1 - 508mm
Main targeted application General purpose pressure and
industrial conveyance
High strength, elevated
temp industrial pressure
Primary grade/min yield strength MPa 355
Tensile strength MPa 490-650
Elongation (longitudinal min) % 22
Standard temperature range (°C) -20 to 400
Low temp option (request at time of order) Note 1
Suitable alternative to seamless Yes

Note 1: It may be possible to demonstrate lower temperature properties if full application is known, please contact one of our account managers to discuss your requirements.

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