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Overview
Grade 2205 stainless steel is a high-performance duplex stainless steel, combining roughly equal proportions of austenite and ferrite in its microstructure. This dual-phase structure gives 2205 a unique balance of high strength and excellent corrosion resistance, outperforming standard austenitic grades such as 304 and 316 in many demanding environments.
Alloyed with around 22% chromium, 5% nickel, 3% molybdenum and controlled nitrogen, 2205 offers outstanding resistance to pitting, crevice corrosion and chloride stress corrosion cracking — a common failure point for conventional austenitic stainless steels. It also delivers roughly twice the yield strength of 316, allowing for lighter, thinner sections in engineered applications.
At Kormax, we supply 2205 duplex stainless steel in standard forms such as round bar and sheet, with custom sizes available on request. Every delivery is backed by batch certification and ISO-accredited quality systems.
2205 stainless steel suppliers recommend this grade where strength, chloride resistance and long-term durability are critical. Typical applications include:
Common Applications
Oil and gas processing equipment and pipework
Marine and offshore structures and components
Chemical processing and pressure vessels
Desalination and seawater handling systems
Pulp and paper digesters and liquor tanks
Heat exchangers, particularly in chloride-bearing service
Key Features
Excellent resistance to pitting, crevice corrosion and chloride stress corrosion cracking
Approximately double the yield strength of austenitic 304/316, allowing reduced section weight
Good weldability with correct procedure and filler selection
Strong resistance to fatigue and erosion-corrosion
Magnetic, due to its ferritic-austenitic duplex structure
Best suited to service temperatures between roughly -50 °C and 300 °C
Sizes & Availability
Kormax supplies 2205 duplex stainless steel round bar in New Zealand. A selection of sizes is held ex-stock, with the remainder of the range available on indent up to 150mm diameter. For projects requiring non-standard sizes, we can provide sourcing support alongside our metal casting services, ensuring engineers receive the material they need.
Selected sizes ex-stock; full range available on indent up to 150mm. Available in New Zealand only.
Profile
Size Range
Metric Size Range (mm)
NZ (Availability)
Manufacturing Method
Solid Round Bar
See Size Range
Up to 150.00 (OD)
Selected sizes ex-stock; balance on indent
Drawn
Diameter (mm)
Diameter (inch)
Weight (Kg/MTR)
12.70
1⁄2
0.34
15.88
5⁄8
0.54
19.05
3⁄4
0.77
20.00
-
0.85
25.40
1
1.37
31.75
1 1⁄4
2.14
38.10
1 1⁄2
3.08
44.45
1 3⁄4
4.19
50.80
2
5.47
57.15
2 1⁄4
6.93
60.00
-
7.64
63.50
2 1⁄2
8.55
70.00
-
10.39
76.20
3
12.32
82.55
3 1⁄4
14.45
88.90
3 1⁄2
16.76
95.25
3 3⁄4
19.24
101.60
4
21.89
114.30
4 1⁄2
27.71
127.00
5
34.21
139.70
5 1⁄2
41.39
152.40
6
49.26
165.10
6 1⁄2
57.80
177.80
7
67.04
190.50
7 1⁄2
76.96
203.20
8
87.56
215.90
8 1⁄2
98.85
228.58
9
110.82
254.00
10
136.82
284.00
-
171.04
304.80
12
197.01
320.00
-
217.15
350.00
-
263.38
380.00
-
306.21
390.00
-
326.92
410.00
-
356.47
W x T (mm)
W x T (inch)
Kg/MTR
50 X 6
-
0.81
50 X 10
-
1.35
50 X 12
-
1.62
50 X 20
-
2.70
50.8 X 25.4
2 X 1
3.49
60 X 10
-
1.62
63.5 X 25.4
2-1/2 X 1
4.36
63.5 X 31.75
2-1/2 X 1-1/4
5.45
76 X 15
-
3.08
76.2 X 12.7
3 X 1/2
2.62
76.2 X 25.4
3 X 1
5.23
76.2 X 31.75
3 X 1-1/4
6.54
76.2 X 38.1
3 X 1-1/2
7.84
76.2 X 50.8
3 X 2
10.46
76.2 X 63.5
3 X 2-1/2
13.07
80 X 6
1.30
80 X 20
4.32
100 X 6
-
1.62
100 X 10
-
2.70
100 X 12
-
3.24
100 X 20
-
5.40
100 X 25
-
6.75
100 X 60
-
16.20
100.3 X 16
-
4.34
101.6 X 32
-
8.78
101.6 X 40
-
10.98
101.6 X 50.8
4 X 2
13.94
101.6 X 76.2
4 X 3
20.91
127 X 76.2
5 X 3
26.13
127 X 101.6
5 X 4
34.84
130 X 65
-
22.82
150 X 10
-
4.05
150 X 12
-
4.86
150 X 25
-
10.13
152.4 X 31.75
6 X 1-1/4
13.07
152.4 X 50.8
6 X 2
20.91
152.4 X 76.2
6 X 3
31.36
152.4 X 101.6
6 X 4
41.81
160 X 45
-
19.44
170 X 32
-
14.69
200 X 12
-
6.48
200 X 40
-
21.60
200 X 55
-
29.70
203.2 X 101.6
8 X 4
55.75
215 X 76.2
-
44.24
230 X 65
-
40.37
230 X 112
-
69.56
232 X 42
-
26.31
235 X 152
-
96.45
240 X 90
-
58.32
254 X 12.7
10 X 1/2
8.71
254 X 50.8
10 X 2
34.84
300 X 36
-
29.16
304 X 50
-
41.04
304.8 X 101.6
12 X 4
83.62
305 X 6
-
4.94
305 X 8
-
6.59
305 X 14
-
11.53
305 X 16
-
13.18
305 X 18
-
14.83
320 X 20
-
17.28
330 X 70
-
62.37
350 X 22.5
-
21.27
351 X 30.5
-
28.91
380 X 10
-
10.26
425 X 25
-
28.69
T x W (mm)
T x W (inch)
Kg/MTR
6 X 50
-
0.81
6 X 80
-
1.30
6 X 100
-
1.62
6 X 305
-
4.94
8 X 305
-
6.59
10 X 50
-
1.35
10 X 60
-
1.62
10 X 100
-
2.70
10 X 150
-
4.05
10 X 380
-
10.26
12 X 50
-
1.62
12 X 100
-
3.24
12 X 150
-
4.86
12 X 200
-
6.48
12.7 X 76.2
1/2 X 3
2.62
12.7 X 254
1/2 X 10
8.71
14 X 305
-
11.53
15 X 76
-
3.08
16 X 100.3
-
4.34
16 X 305
-
13.18
18 X 305
-
14.83
20 X 50
-
2.70
20 X 80
-
4.32
20 X 100
-
5.40
20 X 320
-
17.28
22.5 X 350
-
21.27
25 X 100
-
6.75
25 X 150
-
10.13
25 X 425
-
28.69
25.4 X 50.8
1 X 2
3.49
25.4 X 63.5
1 X 2-1/2
4.36
25.4 X 76.2
1 X 3
5.23
30.5 X 351
-
28.91
31.75 X 152.4
1-1/4 X 6
13.07
31.75 X 63.5
1-1/4 X 2-1/2
5.45
31.75 X 76.2
1-1/4 X 3
6.54
32 X 101.6
-
8.78
32 X 170
-
14.69
36 X 300
-
29.16
38.1 X 76.2
1-1/2 X 3
7.84
40 X 101.6
-
10.98
40 X 200
-
21.60
42 X 232
-
26.31
45 X 160
-
19.44
50 X 304
-
41.04
50.8 X 76.2
2 X 3
10.46
50.8 X 101.6
2 X 4
13.94
50.8 X 152.4
2 X 6
20.91
50.8 X 254
2 X 10
34.84
55 X 200
-
29.70
60 X 100
-
16.20
63.5 X 76.2
2-1/2 X 3
13.07
65 X 130
-
22.82
65 X 230
-
40.37
70 X 330
-
62.37
76.2 X 101.6
3 X 4
20.91
76.2 X 127
3 X 5
26.13
76.2 X 152.4
3 X 6
31.36
76.2 X 215
-
44.24
90 X 240
-
58.32
101.6 X 127
4 X 5
34.84
101.6 X 152.4
4 X 6
41.81
101.6 X 203.2
4 X 8
55.75
101.6 X 304.8
4 X 12
83.62
112 X 230
-
69.56
152 X 235
-
96.45
T x W (mm)
T x W (inch)
Kg/MTR
19.05 X 19.05
¾ X ¾
0.98
25.40 X 25.40
1 X 1
1.75
31.75 X 31.75
1 ¼ X 1 ¼
2.73
38.10 X 38.10
1 ½ X 1 ½
3.92
50.00 X 50.00
-
6.75
50.80 X 50.80
2 X 2
6.97
63.50 X 63.50
2 ½ X 2 ½
10.89
76.20 X 76.20
3 X 3
15.68
101.60 X 101.60
4 X 4
27.88
127.00 X 127.00
5 X 5
43.55
152.40 X 152.40
6 X 6
62.71
178.60 X 178.60
7 X 7
86.12
180.00 X 180.00
-
87.48
203.00 X 203.00
-
111.27
2205 Stainless Steel
2205 Stainless Steel
2205 Stainless Steel
2205 Stainless Steel
2205 Stainless Steel
2205 Stainless Steel
2205 Stainless Steel
2205 Stainless Steel
2205 Stainless Steel
2205 Stainless Steel
2205 Stainless Steel
2205 Stainless Steel
2205 Stainless Steel
2205 Stainless Steel
2205 Stainless Steel
2205 Stainless Steel
2205 Stainless Steel
2205 Stainless Steel
Chemical Composition
Duplex stainless steel 2205 owes its strength and corrosion resistance to its balanced chemistry. High chromium and molybdenum levels deliver superior performance in aggressive settings. Every batch supplied by Kormax comes fully certified for peace of mind.
(Typical Composition %)
| Element | Symbol | Value |
| Carbon | C | ≤0.030 |
| Silicon | Si | ≤1.0 |
| Manganese | Mn | ≤2.0 |
| Phosphorus | P | ≤0.030 |
| Sulfur | S | ≤0.020 |
| Chromium | Cr | 22.0–23.0 |
| Nickel | Ni | 4.5–6.5 |
| Molybdenum | Mo | 3.0–3.5 |
| Nitrogen | N | 0.14–0.20 |
Mechanical Properties
Engineers rely on 2205 duplex stainless steel for its exceptional strength, which is roughly double that of austenitic 316. This makes it well suited to high-pressure systems, structural fabrication and weight-critical applications.
| Property | Value |
| Tensile Strength | ≥ 620 MPa |
| Yield Strength | ≥ 450MPa |
| Elongation | ≥ 25% (A50mm) |
| Hardness | ≤ 293 HB |
Comparative Specifications
Machining Allowances and Tolerances
When working with 2205 duplex stainless steel, dimensional accuracy is important. Kormax products are manufactured to ASTM A276 / A479 with ISO H-tolerances, the same rigorous approach we apply across our casting alloys and other engineered metals.
| Diameter (mm) Range | Tolerance Class | Tolerance (mm) |
| Up to 19.05 | H9 | +0 / -0.036 |
| 20 and above | H11 | +0 / -0.090 to -0.18 depending on size |
Manufactured to ASTM A276 / A479 with ISO H-tolerances.
Explore More Stainless Steel Grades
Looking for an alternative? Explore our broader range of stainless steel materials, including:
Kormax is your reliable stainless steel supplier, helping engineers source the right materials for lasting performance.
Quality Management
Quality materials, delivered to standard.
Kormax is ISO certified for ISO 9001, ISO 14001, and ISO 45001.
All Kormax products come with batch certifications.
Why Choose Kormax for Duplex Stainless Steel 2205
As a fourth-generation family-owned business, Kormax brings over 75 years of foundry and engineering metals experience to your project.
We operate in various sectors worldwide, utilising our leading engineering, manufacturing and global distribution capabilities to provide reliable solutions for engineers.
Expert Advice
Trusted advice on metal and profile selection for your application, backed by our engineered materials solutions.
Unique Range
Unique range of quality products, in industry-specific profiles and sizes, including casting alloys.
Top-tier Foundries
Global supply network with the ability to source specific sizes and metals through trusted stainless steel supplier partnerships.
Supply Security
For anyone working with critical materials like 2205 stainless steel, we provide custom supply options to enhance continuity.
Quality Management
With ISO 9001, ISO 14001 and ISO 45501 certification, our quality systems include complete batch traceability across all stainless steel grades.
Competitive Pricing
With a wide supplier network, Kormax balances quality and value, supporting long-term partnerships with 2205 stainless steel suppliers worldwide.