MATERIAL DESCRIPTION

EDX 2304 according to MDS D35 has an improved balanced chemistry of chromium, molybdenum and nitrogen content, resulting in a PRE value ≥ 28 and increased mechanical strength compared to the standard UNS 32304. EDX 2304 outruns both 1.4404 and 1.4436 with respect to pitting corrosion resistance. Due to risk of embrittlement, duplex steels should not be used at temperatures above 250 – 325°C.

Chemical composition

WEIGHT% C SI MN S P CR NI MO N CU B
MIN. 22,00 3,50 0,10 0,05 0,10
MAX. 0,030 1,00 2,00 0,015 0,035 24,00 5,50 0,60 0,20 0,60 35 PPM

Product Standards: EN 10088-2, EN 10028–7, ASTM A240
Approvals: NORSOK M650, Internal MDS D35 by AkerSolutions AS

APPLICATIONS

The main applications are for details with special requirements for high corrosion resistance. S31803 is characterized by:
• Good resistance to stress corrosion cracking.
• Good resistance to pitting and crevice corrosion.
• High resistance to general corrosion.
• High mechanical strength.
• High resistance to erosion corrosion and corrosion fatigue.

MECHANICAL PROPERTIES

YIELD STRENGTH
RP0.2
MPA
TENSILE STRENGTH
RM
MPA
ELONGATION
[%]
HARDNESS
[HB]
IMPACT,
CHARPY-V, -46ºC
[J]
PRE
PLATE CR (T<13MM) ≥ 500 ≥ 690 ≥ 25 ≥ 45 ≥ 28
PLATE HR (T≥13MM) ≥ 420 ≥ 630 ≥ 25 ≤ 290 ≥ 45 ≥ 28

Heat Treatment

Solution annealing at 1020 – 1100°C followed by water quenching

Weldability

Very good.

ALLOY 1.4362 / LEAN DUPLEX UNS S32304 / EDX 2304 PLATES

DESCRIPTION KG/PLATE
2 X 1500 X 3000 MM 72
2 X 2000 X 6000 MM 192
3 X 1500 X 3000 MM 108
3 X 2000 X 6000 MM 288
4 X 1500 X 3000 MM 144
4 X 2000 X 6000 MM 384
5 X 1500 X 3000 MM 180
5 X 2000 X 6000 MM 480
6 X 1500 X 3000 MM 216
6 X 2000 X 6000 MM 576
8 X 1500 X 3000 MM 297
8 X 2000 X 6000 MM 791
10 X 1500 X 3000 MM 371
10 X 2000 X 6000 MM 989
12 X 1500 X 3000 MM 445
12 X 2000 X 6000 MM 1187
15 X 1500 X 3000 MM 556
15 X 2000 X 6000 MM 1484
20 X 1500 X 3000 MM 742
25 X 1500 X 3000 MM 927
25 X 2000 X 6000 MM 2472
30 X 1500 X 3000 MM 1112
30 X 2000 X 6000 MM 2966
40 X 1500 X 3000 MM 1483
40 X 2000 X 4000 MM 2637
50 X 1500 X 3000 MM 1854
50 X 2000 X 4000 MM 3296

ALLOY 1.4362 / LEAN DUPLEX UNS S32304 / EDX 2304 HOLLOW SECTIONS

DESCRIPTION KG/M
50 X 50 X 4 MM 5.96
60 X 60 X 4 MM 7.25
80 X 80 X 5 MM 12.13
100 X 100 X 6 MM 17.76
120 X 120 X 6 MM 21.60
150 X 150 X 6 MM 27.36
200 X 200 X 8 MM 49.43
250 X 250 X 8 MM 61.95

ALLOY 1.4362 / LEAN DUPLEX UNS S32304 / EDX 2304 HOT ROLLED ANGLES

DESCRIPTION KG/M
50 X 50 X 5 MM 3.85
60 X 60 X 6 MM 5.53
80 X 80 X 8 MM 9.85
100 X 100 X 10 MM 15.40