The lightweight solution for heavily stressed pressure vessels

Great stresses, low temperatures or acidic fluids – your pressure vessels meet maximum specifications with minimum use of material when you select DIROS proprietary steels from Dillinger.

The strengths of DIROS proprietary steel

  • DIROS 500 vacuum-treated, water-quenched and tempered fine-grained structural steel is a further evolution of the P500Q steel standardised in EN 10028, Part 6, and of the ASTM/ASME A/SA 533 grade.
  • DIROS 500 possesses high mechanical strength and extremely good low-temperature toughness. It is therefore ideal for use in pressure vessels in offshore structures for which weight-optimisation is of special importance.
  • Customers can choose between two variants: DIROS 500 HT for maximum mechanical strength and DIROS 500 S for high mechanical strength combined with resistance to sour gases in accordance with the requirements of NACE MR 0175.
  • Like all Dillinger proprietary steels, DIROS has extremely good working and welding properties.


Data sheets & specifications

Delivery program – heavy plate
DIROS 500 – high strength fine grained pressure vessel steel, quenched and tempered

Contact persons


Philipp Ludwig
Head of Sales Department, Energy Transmission & Processing

Phone: +49 6831 472472
Fax: +49 6831 47 99 2685


Jörg Maffert
Head of Marketing & Technical Support, Energy Transmission & Processing

Phone: +49 6831 473612
Fax: +49 6831 473089