304LN/S30453/SUS 304LN Stainless Steel
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  • Parameter
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304LN is used where an extremely low level of magnetic permeability is required. This derives from its high nitrogen content.

Approximate Composition – 18% Cr, 9% Ni, 0.15% N (Exact composition ranges vary between EN and ASTM standards).


This grade combines the following characteristics:

1、Moderate pitting and crevice corrosion resistance

2、Excellent impact toughness at sub-zero temperatures

3、Higher 0.2% PS than 304L

4、Non-magnetic. Very low ferrite level and very resistant to martensitic transformation. Relative magnetic permeability < 1.005

5、Good weldability. Care needed to avoid solidification cracking


304LN stainless steel was originally developed as a higher strength version of 304L using nitrogen. However, the increase in strength is only modest and duplex grades are now mostly used for this purpose. The grade is now used in specialised applications where a very low magnetic response is needed. In standard 304L, a typical level of relative magnetic permeability is around 1.05-1.1 due to small amounts of ferrite in the austenitic structure. A completely non-magnetic material would have a value of 1.0. 304LN can achieve a maximum value of around 1.005, which is the lowest practical level of any steel grade. It is also very resistant to transformation to the magnetic martensitic phase which can occur on forming or cooling to very low temperatures. Therefore, its main uses are in specialised equipment where magnetic “interference” needs to be avoided and/or for use in cryogenic equipment.


STANDARDS
INDUSTEEL TRADEMARKS UNS ASTM EURONORMS EN SUS
UR™ 304LN S30453 304LN 1.4311
X2CrNiN18-10
SUS 304LN
CHEMICAL ANALYSIS (%WEIGHT)
C Cr Ni Mo N Others
< 0,030 18,5 8,5 - 0,15

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
270 39 335 49 550 80 630 91 45 21
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

PDF: http://www.industeel.info/wp-content/uploads/2016/01/DS-INOX-UR304LN-UR304Nv2.pdf
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