MATERIAL DESCRIPTION

Duplex UNS S31803 is the most common duplex grade in the market. It has very good resistance to localized corrosion and stress corrosion cracking in combination with high mechanical strength. It is widely used in oil & gas, hydro power, pressure vessels, pulp & paper, structural components and chemical tankers. The alloy is not intended to be used at temperatures above 300°C due to embrittlement.

Chemical composition

WEIGHT% C SI MN S P CR NI MO N
MIN. 21,00 4,50 2,50 0,10
MAX. 0,030 1,00 2,00 0,015 0,030 23,00 6,50 3,50 0,22

NORSOK: N: 0,14 – 0,20%
Product Standards: EN 10088-3, ASTM A276, ASTM A479, ASTM A182–11A (Chemical composition and mechanical properties only)
Approvals: NACE MR0175, NORSOK M650, NORSOK M630 MDS D41/D43/ D44/ D45/ D47

APPLICATIONS

The main applications are for details with special requirements for high corrosion resistance.
S31803 is characterized by:
• High resistance to stress corrosion cracking in halide containing environments.
• High 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
BAR ≥ 450 650 – 880 ≥ 25 ≤ 270 ≥ 45 ≥ 33
PLATE, CR ≥ 500 700 – 950 ≥ 20 ≥ 45 ≥ 33
PLATE, HR ≥ 460 640 – 840 ≥ 25 ≥ 45 ≥ 33

Heat Treatment

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

Weldability

Very good.

ALLOY 1.4462 / DUPLEX UNS S31803 ROUND BAR

DESCRIPTION KG/M
6 mm 0.3
8 mm 0.4
10 mm 0.6
12 mm 1.
16 mm 1.7
20 mm 2.6
25 mm 4.
30 mm 5.6
35 mm 7.7
40 mm 10.1
45 mm 12.7
50 mm 15.7
60 mm 22.6
70 mm 30.8
80 mm 40.2
90 mm 50.9
100 mm 62.9
110 mm 76.1
120 mm 90.5
125 mm 98.7
130 mm 106.
140 mm 123.
150 mm 141
160 mm 161
170 mm 182
DESCRIPTION KG/M
180 mm 204
185 mm 215
190 mm 228
200 mm 251
202 mm 258
210 mm 278
220 mm 304
225 mm 319
230 mm 333
240 mm 362
250 mm 385
265 mm 438
275 mm 476
280 mm 493
300 mm 566
310 mm 612
320 mm 645
330 mm 686
350 mm 780
355,6 mm 805
365 mm 840
375 mm 880
380 mm 910
400 mm 995
410 mm 1058

ALLOY 1.4462 / DUPLEX UNS S31803 PLATES

DESCRIPTION KG/PLATE
1 x 1000 x 2000 mm 16
1 x 1500 x 3000 mm 36
1,5 x 1500 x 3000 mm 54
2 x 1000 x 2000 mm 32
2 x 1500 x 3000 mm 72
3 x 1500 x 3000 mm 108
3 x 1500 x 6000 mm 216
3 x 2000 x 6000 mm 288
4 x 1500 x 3000 mm 144
4 x 1500 x 6000 mm 288
4 x 2000 x 6000 mm 384
5 x 1500 x 3000 mm 180
5 x 1500 x 6000 mm 360
5 x 2000 x 6000 mm 480
6 x 1500 x 3000 mm 216
6 x 1500 x 6000 mm 432
6 x 2000 x 6000 mm 576
8 x 1500 x 3000 mm 297
8 x 1500 x 6000 mm 594
8 x 2000 x 6000 mm 791
10 x 1500 x 3000 mm 371
10 x 1500 x 6000 mm 742
10 x 2000 x 6000 mm 989
DESCRIPTION KG/PLATE
12 x 1500 x 3000 mm 445
12 x 1500 x 6000 mm 890
12 x 2000 x 6000 mm 1187
15 x 1500 x 3000 mm 557
15 x 1500 x 6000 mm 1113
15 x 2000 x 6000 mm 1484
20 x 1500 x 3000 mm 742
20 x 1500 x 6000 mm 1484
20 x 2000 x 6000 mm 1978
25 x 1500 x 3000 mm 927
25 x 1500 x 6000 mm 1854
25 x 2000 x 6000 mm 2472
30 x 1500 x 3000 mm 1113
30 x 1500 x 6000 mm 2225
30 x 2000 x 6000 mm 2967
35 x 2000 x 6000 mm 3360
40 x 1500 x 3000 mm 1484
40 x 1500 x 6000 mm 2967
40 x 2000 x 6000 mm 3956
45 x 2000 x 4000 mm 2880
50 x 1500 x 3000 mm 1854
50 x 1500 x 6000 mm 3708
50 x 2000 x 6000 mm 4944

ALLOY 1.4462 / DUPLEX UNS S31803 HOLLOW BAR

OD MM ID MM WEIGHT KG/M
32 20 4,2
32 16 5,1
36 25 4,5
36 20 5,9
36 16 6,8
40 28 5,5
40 25 6,5
40 20 7,8
45 32 6,7
45 28 8,2
45 20 10,5
50 36 8
50 32 9,7
50 25 12,1
56 40 10,2
56 36 12,1
56 28 15,2
63 50 9,9
63 45 12,2
63 40 15,4
63 36 17,3
63 32 19
71 56 12,9
71 45 19,6
71 40 22,3
71 36 24,1
75 60 13,7
75 50 21,1
75 40 26
80 63 16,4
80 50 25,3
80 45 28,3
80 40 30,9
85 67 18,5
85 55 26,8
85 45 33,5
90 71 20,6
90 63 27,1
90 56 32,3
90 50 36,1
95 75 23
95 67 29,9
95 50 42,1
100 80 24,4
100 71 32,7
100 63 39,2
100 56 42,3
106 80 32,3
106 71 40,6
106 63 47,1
106 56 52,1
112 90 30,2
112 80 40,6
112 71 48,8
112 63 55,3
118 90 39
118 80 49,4
118 71 57,6
118 63 64,2
125 100 38,3
125 90 49,8
125 80 60,2
125 71 68,5
132 106 42
132 90 61,1
132 80 71,5
132 71 79,7
140 112 47,8
140 118 39
143,3 110,1 55
140 100 63,3
140 90 74,9
140 80 85,2
150 125 47,4
150 106 74,2
150 95 87,7
150 80 103,3
160 132 56,2
160 122 71,6
160 112 85,8
160 90 112,9
170 140 63,8
170 130 80,2
170 118 98,4
170 106 114,7
170 100 122,3
180 150 68,4
180 140 86,1
180 125 110
180 100 144,4
190 160 73
190 150 91,9
190 132 123
200 170 77,6
200 160 97,6
200 150 117
200 140 134
212 170 109
212 150 148
212 130 182
224 180 121
224 140 199
236 190 133
236 150 216
250 200 153