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Austenitic
These are the most popular of the stainless steels because of their ductility, ease of working and good corrosion resistance; they are derived from the 18Cr-8Ni stainless steel Type 304. The other grades are developed to provide special corrosion resistance properties by adding Molybdenum, Chromium and/or decreasing Carbon content (L grades).
Addition of stabilizing elements like Titanium or Niobium (Columbium) provides better weldability. Addition of Nitrogen increases mechanical strength as for grades 304N or 316N.
They are also available in the heat resistant version (H grades) with a higher Carbon content and coarser grain size to improve creep resistance. They can be used up to 870°C /1600°F.
They also exhibit good ductility and toughness even at cryogenic temperatures.
All are essentially nonmagnetic in the annealed condition, although some may become slightly magnetic by cold working.
The major weakness of the austenitic stainless steels is their susceptibility to chloride stress corrosion cracking (SCC).
They serve a wide range of applications: architecture, food processing environments, organic and inorganic chemicals environments in the process industry, nitric acid and sulphuric acids at moderate temperature and concentrations, equipment for use at cryogenic temperatures, storage and transportation of liquefied gases, transportation, water and wastewater treatment…
INDUSTEEL TRADEMARKS |
UNS |
ASTM |
EURONORMS EN |
SUS |
---|---|---|---|---|
UR™ 317LMN | S31726 | 317LMN | 1.4439 X2CrNiMoN17-13-5 |
- |
UR™ 317LN | S31753 | 317LN | 1.4434 X2CrNiMoN18-12-4 |
SUS 317LN |
UR™ 317L | S31703 | 317L | 1.4438 X2CrNiMo18-15-4 |
SUS 317L |
UR™ 316LN | S31653 | 316LN | 1.4429 X2CrNiMoN17-13-3 |
SUS 316LN |
UR™ 316LMo | S31603 | 316L | 1.4432 X2CrNiMo17-12-3 |
- |
UR™ 316 | S31600 | 316 | 1.4436 X3CrNiMo17-13-3 |
SUS 316 |
UR™ 316H | S31609 | 316H | 1.4401 X5CrNiMo17-12-2 |
SUS 316 |
UR™ 316L | S31603 | 316L | 1.4404 X2CrNiMo17-12-2 |
SUS 316L |
UR™ 316Ti | S31635 | 316Ti | 1.4571 X6CrNiMoTi17-12-2 |
SUS 316Ti |
UR™ 316Nb | S31640 | 316Cb | 1.4580 X6CrNiMoNb17-12-2 |
- |
UR™ 304H | S30400 | 304(H) | 1.4301 X5CrNi18-10 |
SUS 304 |
UR™ 304L | S30403 | 304L | 1.4307 X2CrNi18-9 |
SUS 304L |
UR™ 304L | S30403 | 304L | 1.4306 X2CrNi19-11 |
SUS 304L |
UR™ 321 | S32100 | 321 | 1.4541 X6CrNiTi18-10 |
SUS 321 |
UR™ 347 | S34700 | 347 | 1.4550 X6CrNiNb18-10 |
SUS 347 |
UR™ 304N | S30451 | 304N | 1.4315 X5CrNiN19-9 |
SUS 304N1 |
UR™ 304LN | S30453 | 304LN | 1.4311 X2CrNiN18-10 |
SUS 304LN |
CryElso™ 201LN | S20153 | 201LN | 1.4371 X2CrMnNiN17-7-5 |
- |
UR™ XM19 | S20910 | XM19 | - |
- |
UR™ XM 29 | S24000 | XM29 | - |
- |