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Duplex & Super Duplex Steels

S32750 • 1.4410
  • Application

Super Duplex stainless like S32750, is a mixed microstructure of austenite and ferrite (50/50) which has improved strength over ferritic and austenitic steel grades. The main difference is that Super Duplex has a higher molybdenum and chromium content which gives the material greater corrosion resistance than standard duplex grades.

The balanced duel phase microstructure combines high strength with cost effective corrosion resistance particularly in high chloride environments. Super Duplex has the same benefits as its counterpart – it has lower alloying costs when compared with similar ferritic and austenitic grades with equipment corrosion resistance in chloride containing environments due to the material’s increased tensile and yield strength. In many cases this gives the purchaser the welcomed option of purchasing smaller thicknesses without the need to compromise on quality and performance.

  • Typical manufacturing specifications

ASTM A789, ASTM A790
Also individual customer specifications.

  • Industries predominantly using this grade

Subsea control lines, Offshore platforms, Injection & Ballast water systems etc.

1-6

Technical Data

Chemical composition(% by Weight)

Element

C

Mn

P

S

Si

Ni

Cr

Mo

N

Cu

Minimum

-

-

-

-

-

6.0

24.0

3.0

0.24

-

Maximum

0.030

1.20

0.035

0.020

0.80

8.0

26.0

5.0

0.32

0.50

Aiming

0.01

0.8

0.03

0.002

0.3

6.8

25

3.75

0.27

0.2

Mechanical Properties

Specifications(Tubing, Annealed) Actual data
Tensile Rm
116
ksi (min.)
123 ~ 137
ksi
Tensile Rm
800
MPa (min.)
850 ~ 950
MPa
Yield (R.p. 0.2%)
80
ksi (min.)
91 ~ 101
ksi
Yield (R.p. 0.2%)
550
MPa (min.)
630 ~ 700
MPa
Elongation
15
% (min.)
28 ~ 35
%