Austenitic Stainless Steels - Applications
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| European Steel Designation | AISI Nearest Fit | Service Properties | Applications |
|---|---|---|---|
| 1.4310 X10 Cr Ni 18-8 |
301 | Lower Chrome and Nickel content increases the work hardening rate to give high strength and abrasion resistance. Particularly suitable for components requiring stretch forming, high strength or good spring properties. | Springs, pressings, connectors, chemically etched components. |
| 1.4301 X5 Cr Ni 18-10 |
304 | The most popular grade in the austenitic (300) series, exhibiting good corrosion resistance and formability. 1.4301 (AISI 304) can be used in the welded condition in mild environments, however 1.4307 (AISI 304L) should be used in more corrosive conditions. | Floppy disk (shutter), flexible tube, expanded metal, fabrications, decorative trim, pressings, springs |
| 1.4307 X2 Cr Ni 18-9 1.4306 X2 Cr Ni 19-11 |
304L | Reduced
Carbon content for better corrosion
resistance in welded structures
than the base grade 1.4301 (AISI
304). |
Water tube, bellows, pressings |
| 1.4303 X4 Cr Ni 18-12 |
305 | Nickel content is increased compared with the base grade 1.4301 (AISI 304) to lower the work hardening rate. Preferred for deep drawing or spinning operations. | Pen caps and bodies, deep drawn components generally. |
| 1.4401 X5 Cr Ni Mo 17-12-2 and 1.4436 X3 Cr Ni Mo 17-13-3 |
316 | Molybdenum
is added to increase the corrosion
resistance when compared with the
base grade 1.4301 (AISI 304) Two alloys are produced having increased corrosion resistance with increasing Molybdenum. 1.4401 = 2.0 – 2.5 % Molybdenum 1.4436 = 2.5 – 3.0 % Molybdenum |
Bursting discs, seals, bellows, gaskets, expansion joints, explosion panels, tubes, diaphragms and components in chemical, petrochemical and marine applications. |
|
1.4404 X2 Cr Ni Mo 17-12-2 1.4432 X2 Cr Ni Mo 17-12-3 1.4435 X2 Cr Ni Mo 18-14-3 |
316L | Reduced Carbon content for better welded corrosion resistance than 1.4401 / 1.4436 (AISI 316) | As for 1.4401 and 1.4432 above. |
| 1.4571 X6 CrNiMoTi 17-12-2 |
320 | A
'stabilised' version of 1.4401 (AISI
316), the addition of Titanium improves
the corrosion resistance of welds
by preventing the formation of chromium
carbides. |
Application is usually found in welded fabrications needing excellent corrosion resistance. |
| 1.4541 X6 Cr Ni Ti 18-10 |
321 | Titanium
is added to oppose chromium carbide
precipitation and remove the risk
of deteriorating corrosion performance
in welded structures as may occur
in the base grade 1.4301 (AISI 304). |
Expansion
joints, seals, bellows, gaskets,
honeycomb seals, thermal insulation,
tube and bellows. The use of “stabilised” grades is favoured by the aerospace industry, particularly in engine related applications. |
| 1.4550 X6 Cr Ni Nb 18-10 |
347 | Niobium is added to oppose chromium carbide precipitation in the same way as Titanium is used in the alloy 1.4541 above. | As above, where elevated operating temperatures may otherwise encourage the formation of chromium carbides. |
