Nitronic 33 is a nitrogen-strengthened austenitic stainless steel that combines high yield strength with excellent toughness and ductility. It’s magnetic permeability remains very low after severe cold working and at cryogenic temperatures.

The alloy is superior to 304 stainless in at least five specific areas: (1) Yield strength in the annealed condition is approximately twice that of 304, (2) it has excellent strength and ductility at cryogenic temperatures, (3)has better stress corrosion cracking resistance than 304, (4) low magnetic permeability is retained at cryogenic temperatures and after severe cold working and, (5) resistance to wear and galling is superior to the standard austenitic stainless steels.

The corrosion resistance of Nitronic 33 is superior to 409 and, in general, is nearly equal to 304. In weak acid solutions, the corrosion resistance of Nitronic 33 approaches that of 304. In more aggressive media Nitronic 33 is somewhat less resistance than 304.

Nitronic 33 is markedly more resistant than 304 and 304L to stress corrosion cracking in hot chloride solutions at lower stress levels. At higher stress levels (approx. 50 ksi and above) they are equal. Like most stainless steels, Nitronic 33 is prone to pitting and crevice corrosion in seawater and other aggressive environments, and should not be used under these conditions unless cathodically protected.

Although Nitronic 33 is considerably stronger than the conventional austenitic stainless steels, the same fabricating equipment and techniques can generally be used.

STANDARDS
INDUSTEEL TRADEMARKS		UNS	ASTM	EURONORMS EN	SUS
Nitronic 33		S24000	XM29	-	-
CHEMICAL ANALYSIS (%WEIGHT)
C	Cr	Ni	Mo	N	Others
< 0,080	18	2,5	-	-	Mn = 13

PROPERTIES
0,2 Y.S. - Rp 0,2min ASTM / EN		0,2 Y.S. - Rp 0,2(2)typical value		UTS - Rm min ASTM / EN		UTS - Rm(2)typical value		EI-A(1)%	PREN(4)	HOMOLOGATIONS
MPa	Ksi	MPa	Ksi	MPa	Ksi	MPa	Ksi			Last revised
380	55	435	63	690	100	720	104	40	18

Applications

• Cryogenic Service – tanks valves, piping, flanges, and structural supports
• Abrasion/Wear Resistance – screens, racks, and wear plates
• Electrical (low magnetic permeability) – conduit shielding, MRI scanner supports, fittings, underground transmission risers and pipe and electronic support members
• Marine – mine sweeper components and perming piers
• Nuclear – spent fuel casks (internal supports)
• Process Equipment – heat exchangers, pressure vessels and piping where 304 is borderline with respect to stress corrosion cracking.

APPLICATIONS
CHEMICAL INDUSTRIES			PROCESS INDUSTRIES			WATER TREATMENT			STORAGE & TRANSPORTATION
Nitric Acid	Sulfuric Acid	Polymer& otheracids	Fertilisers	Pulp& Paper	Hydrome-tallurgy	Seawater& desalination	Freshwater &Tanks	Waste Water	Chemical Tanks	Cryogenic Tanks	Renewable

POWER GENERATION				OIL & GAS			CONSTRUCTION
Nuclear	Pollution control	Hydroelectric	Renewable	Off & Onshore & production	Refining & Gas processing	Petrochemical	Architecture	Bridges

For more technical details :
(1) Indicative typical values
(2) Indicative typical values for thickness 20 mm at RT for transverse direction
(3) Hardening 496°C (925°F), 4h, air cooling
(4) PREN = Cr + 3.3 Mo + 16N
(5) PRENW = Cr + 3.3(Mo + 0.5W) + 16N
(6) HT: mechanical properties depend on heat treatment