Lean Duplex S32304

  • Home
  • /
  • Lean Duplex S32304

Lean Duplex S32304

Lean duplex 2304 is a 23% Cr, 4% Nickel, Mo free duplex stainless steel (23.04). We hold stock of duplex alloys in plate, sheet, and bar from our warehouse in the UK. We often meet specialist alloy profiling requirements and are a global supplier. inconel-800
The alloy lean duplex 2304 has similar corrosion resistance properties to 316L. Furthermore, its mechanical properties i.e. yield strength, are twice those of 304/316 austenitic grades. This allows the designer to save weight, particularly for properly designed pressure vessel applications.

The alloy is particularly suitable for applications covering the -50°C/+300°C (-58°F/572°F) temperature range. Lower temperatures may also be considered, but need some restrictions, particularly for welded structures.

With its duplex microstructure, low nickel and high chromium contents, the alloy has improved stress corrosion resistance properties compared to 304 and 316 austenitic grades.


Chemical Analysis

Typical values (weight %)
C Cr Ni Mo N Others
0.020 23 4 0.2 0.1 S = 0.001
PREN (��Cr+3.3��Mo+16��N) ≥ 24

Mechanical Properties

Tensile properties (minimum
values)
°C Rp 0.2
MPa
Rp 1.0
MPa
Rm
MPa
°F YS 0.2��
KSI
YS 1.0��
KSI
UTS
KSI
Elongation
��
20 400 440 600 68 58 64 87 25
100 330 365 570 212 48 53 83 25
200 280 310 530 392 41 45 77 20
30 230 260 490 572 33 38 71 20

Values obtained for hot rolled plates (th ≤ 50mm). Lean duplex 2304 grade must
not be used for a long time at temperatures higher than 300°C &40;572°F), where
precipitation hardening phenomenon occurs.

Hardness values (KCV minimum
values)
Temp. -50°C +20°C -60°F +70°F
Single 75 J/cm² 90 J/cm² 54 ft.lbs 65 ft.lbs
Average (5) 90 J/cm² 150 J/cm² 65 ft.lbs 87 ft.lbs
Hardness values (KCV minimum
values)
Average (5) HV10 180-230 HB : 180-230 HRC ≤ 20

Copper additions may be considered as lean duplex 2304 Cu may be hardened by
heat treatment to improve abrasion-corrosion resistance properties.


Mechanical Properties

Density: 7,800 kg/ – 0.28
lb/in3
Interval
temper
°C
Thermal
expansion
��x10-6K-1
°C Resistivity
(µ�� cm)
Thermal
conductivity
(W.m-1.K-1)
Specific
heat
(J.kg-1.K-1)
Young
modulus
E
(GPa)
Shear
modulus
G
(GPa)
20-100 13 20 80 17 450 200 75
100 92 18 500 190 73
20-200 13.5 200 100 19 530 160 70
20-300 14 300 105 20 560 170 67