Grade S32760 & Grade S31803 Tube

UNS S31803 : Duplex : ASTM A789 (VO1.01) (F51) UNS S32760 : Super Duplex : ASTM A789 (VO1.01) (F55)
Trade Name Zeron 100 (5), Zeron 25 (5)

Chemical composition

UNS S31803

(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 0.02 0.00

UNS S32760

(PREN = % Cr + 3.3% Mo + 16% N)
C Si Mn P S Cr Ni Mo Cu N W PREN Fe
Min 24.00 6.00 3.00 0.50 0.20 0.50 40.00 0.00
Max 0.03 1.00 1.00 0.030 0.010 26.00 8.00 4.00 1.00 0.30 1.00 0.00

Mechanical properties

Condition: UNS S31803 Solution Annealed and Water Quenched

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)

Condition: UNS S32760 Solution Annealed and Water Quenched

NACE MR0175 limits the supply hardness to 28 HRC max.
U.T.S 109 KSI Min (750 N/mm2)
0.2% Proof Stress 80 KSI Min (550 N/mm2)
Elongation 25 %
Red of Area 45 %
CVN Impacts @ -40°C (-40°F) 50 Joules (37 ft-lbf)
Size range: 3.5”∅ - 8.5”∅

General scope

Both alloys combine the dual features of high strength and corrosion resistance obtained through the dual phase microstructure (50% austenite, 50% ferrite) associated with duplex stainless steels. UNS S32760 properties are slightly enhanced over S31803 by further additions of chromium (to 25%), and also tungsten and copper.

Thin sections (Tubulars) are capable of being cold worked to give yield strength of 105 KSI min.

Primarily manufactured in:

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

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