General Information

Austenitic stainless steel is one of the five classes of stainless steel by crystalline structure (along with ferritic, martensitic, duplex and precipitation hardened). Its primary crystalline structure is austenite (face-centered cubic). These steels usually cannot be hardened by heat treatment and are non-magnetic. This structure is achieved by adding enough austenite stabilizing elements such as nickel, manganese and nitrogen.

Like the austenitic stainless steels, the super austenitic stainless steels are also very ductile; they have excellent toughness, high strength, excellent corrosion resistance, good weldability and excellent formability. The super austenitic stainless steels are generally used where higher corrosion resistance, especially protection against chloride pitting and crevice corrosion, is required. Super austenitic stainless steels are defined as austenitic iron-based alloys with a PREN value greater than 40.


Alloy BÖHLER brand WstNo. UNS ISO AMS ASTM Others
304 A500 1.4301 S30400 X5CrNi18-10 A182 AISI: 304
304L A607 1.4307 S30403 X2CrNi18-9 A182 AISI: 304L
316 A120 1.4401 S31600 X5CrNiMo17-12-2 A182 AISI: 316
316L A200 1.4404 S31600 X2CrNiMo17-12-2 A182 AISI: 316L
316L A220 1.4435 S31603 X2CrNiMo18-14-3 AISI: 316LUG, STN: 17 350
317L A102 1.4449 S31703 X3CrNiMo18-12-3 A182 AISI: 317L
310 Urea A405 1.4466 S31050 X1CrNiMoN25-22-2 AISI: 310 MoLN
321 A700 1.4541 S32100 X6CrNiTi18-10 A182 AISI: 321
347 A750 1.4546, 1.4550 N07090 X6CrNiNb18-10 5512, 5646 AISI: 347
 – P558 1.3808 S29225 X20CrMnMoN17-11-3
Alloy  50 P511 Nitronic  50 S20910 X3CrNiMnMo22-13-3-2 A182, A276, A479 AISI: XM 19
U-Boot Stahl 1.3964 P501 1.3964 X2CrNiMnMoNNb21-16-5-3
U-Boot Stahl 1.3974 P503 1.3974 X2CrNiMnMoNNb23-17-6-3
316LN/ U-Boot Stahl 1.3952 P510 1.4429 X2CrNiMoN17-13-3 316LN
Alloy 904L A962RC 1.4539 N08904 X1NiCrMoCu25-20-5 A182
254SMO A965SA 1.4547 S31254 X1CrNiMoCuN20-18-7 AISI: F44
Alloy 926, Alloy 6XN A970 1.4529 N08926 X1CrNiMoCuN20-18-7
Alloy 24 P500 1.4565 X2CrNiMnMoN25-18-6-5 Alloy 24
Alloy 31 A952 1.4562 N08031 X1NiCrMoCu32-28-7 B564, B649
Alloy  60 P513 – Nitronic 60 S21800 X10CrNiMn17-8-8 A276, A314, A479, A484
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