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The most common stainless steels used in the process industry are, with the AISI denomination, the 304 and 316 grades. These two grades are, in most cases, optimal when considering formability, weldability, availability and price.
Some applications however, require more corrosion resistant materials. Such materials are available from a number of manufacturers in many product forms.
The following table contains a number of standard stainless steels, special alloys and nickel base alloys:
SS |
EN |
ASTM/AISI/UNS |
Chemical composition, %wt |
Application |
Standard stainless steels |
|
C,max |
Cr |
Ni |
Mo |
Other |
|
2333 |
1.4301 |
304 |
0.05 |
18.3 |
9 |
- |
- |
Standard stainless material |
2352 |
1.4306 |
304L |
0.03 |
18.3 |
10 |
- |
- |
Lower carbon content gives a higher corrosion resistance compared to the above material (304) after welding |
2337 |
1.4541 |
321 |
0.08 |
17.5 |
10 |
- |
- |
Titanium stabilized, German praxis. Used instead of a low carbon content |
Standard stainless (marine grade) steels |
|
|
|
|
|
|
2343 |
1.4436 |
316(2.5Mo) |
0.05 |
17 |
12 |
2.6 |
|
Improved corrosion resistance in acid and chloride containing environments compared to the above materials (304/L) |
|
1.4432 |
|
0.03 |
17 |
11 |
2.6 |
|
Comparable to 2343/316 |
2347 |
1.4401 |
316 |
0.05 |
17 |
12 |
2.1 |
|
Comparable to 2343/316 |
2348 |
1.4404 |
316L |
0.03 |
17 |
12 |
2.1 |
|
Comparable to 2343/316 |
2353 |
1.4435 |
316L(2.5Mo) |
0.03 |
17 |
12 |
2.6 |
|
Comparable to 2343/316 |
2350 |
1.4571 |
316Ti |
0.08 |
17 |
12 |
2.1 |
|
Comparable to 2343/316 |
Duplex stainless steels |
|
|
|
|
|
|
|
|
1.4162 |
S32101 |
0.03 |
21.5 |
1.5 |
0.22 |
|
Lean alloy, high strength |
2327 |
1.4362 |
S32304 |
0.03 |
23 |
4.5 |
0.2 |
0.12N |
High strength, good resistance to stress corrosion cracking |
2377 |
1.4462 |
S31803 |
0.03 |
22 |
5 |
3 |
0.17N |
Similar to 2327, with improved resistance to chloride environments |
2328 |
1.4410 |
S32750 |
0.03 |
25 |
7 |
4 |
0.28N |
Similar to 2377, with even higher resistance to chloride environments and a higher strength |
High alloy austenitic stainless steels –super austenites |
|
|
|
2584 |
1.4563 |
N08028 |
0.03 |
27 |
31 |
3.5 |
2Cu |
Allround, will withstand most environments (Sanicro 28) |
2562 |
1.4539 |
N08904 |
0.03 |
20 |
25 |
4.5 |
1,5Cu |
Allround, somewhat lower resistance than 2584 |
2378 |
1.4547 |
S31254 |
0.03 |
20 |
18 |
6.1 |
N,Cu |
Very good chloride resistance (254SMO) |
Nickel base alloys |
|
|
|
|
|
|
|
|
2.4856 |
N06625 |
0.025 |
22 |
60 |
9 |
Nb |
Alloy 625; High chloride resistance |
|
2.4617 |
N10665 |
0.01 |
0.7 |
70 |
28 |
|
Alloy B-2; High corrosion resistance in strong acids |
|
2.4610 |
N06455 |
0.01 |
16 |
66 |
16 |
|
Alloy C-4; intermediate between A625 och Alloy B-2 |
|
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There are a large number of special stainless steels developed for specific environments, not included in this table. Applications such as nitric acid, sulphuric acid, urea, oil and gas, high temperatures, pharmaceutical, electronics, etc.
We have the knowledge and experience to help you with the material selection for special applications.
| Siljan Allards AB, Phone +46(0)248-125
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www.siljanallards.com |
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