Precipitation Hardening Stainless Steels

Precipitation Hardening Grades Stocked:

* ASTM A564 Type 630 (17-4 PH)


Condition A (Solution Annealed)






(nbsp)(Primary Hardened, 750/620 Overaged)

* Materials where applicable are supplied in accordance with NACE MR0175

Rounds: 3mm dia. to 520mm dia

Rectangular: 50.8mm x 12.7mm to 240mm x 75mm

Square: 12.7mm Sq. to 50.8mm Sq


  • High strength
  • Acceptable level of toughness
  • Moderate – good corrosion resistance
  • High fatigue resistance
  • Suitable for heat treatment to achieve high strength
  • FV520B stainless steel has high impact resistance in the 550 Deg C ‘aged’ condition

This is a steel which can be aged at varying temperatures to give varying degrees of mechanical strengths. It displays characteristics of both austenitic and martensitic stainless steels.


Used in defence, in aerospace equipment and missile components and as a commercial grade in oil and gas industries, specifically for valves and pumps.

The metallurgy of these steels can be complex and if you need any help concerning usage, heat treatment etc please do consult us for advice specific to your needs. If we can’t provide you with an answer, we will go to our main supplier in Germany – “Doerrenberg” – who have extensive know-how in the field of metallurgy. or call 01226 766766