Grade S31803 - F51

UNS S31803 : Duplex Stainless : ASTM A182 (VO1.01), A276 (VO1.03), A479 (VO1.03), BS EN 10088
Trade Name Zeron 25 (4)

General scope

The characteristic feature of duplex stainless steels is their dual phase microstructure, comprising of approximately 50% of austenitic and 50% of ferrite. This provides the material with an excellent combination of high strength and corrosion resistance.

Pitting Corrosion - The resistance to pitting corrosion may be compared to other grades by using the pitting index PREN. The higher the PREN value, the better the pitting resistance.

Chemical composition

(PREN = % Cr + 3.3% Mo + 16% N)
C Si Mn P S Cr Ni Mo N PREN Fe
Min 21.00 4.50 2.50 0.08 33.00 0.00
Max 0.03 1.00 2.00 0.030 0.020 23.00 6.50 3.50 0.20 0.00

Mechanical properties

Condition: Solution Annealed and Water Quenched.

NACE MR0175 limits the supply hardness to 28 HRC max.
U.T.S 90 KSI Min (620 N/mm2)
0.2% Proof Stress 65 KSI Min (450 N/mm2)
Elongation 25 %
Red of Area 45 %
CVN Impacts @ -40°C (-40°F) 40 Joules (30 ft-lbf)
Size range: 1”∅ - 18”∅

Primarily manufactured in:

  • Dubai, UAE
  • Edmonton, Canada
  • Houston, Texas
  • Sheffield, England
  • Singapore