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The non-magnetic nature of Grade 904L allows it to be used in applications where magnetic activity is not required, such as in MRI machines.Other advantageous characteristics of the 904L include its excellent formability, improved toughness, and good weldability, to name a few. Grade 904L stainless steel can be welded using all conventional methods and does not require pre-heating or post-welding heat treatments. Grade 904L stainless steel is also corrosion resistant. Grade 904L is very valuable because it has a lot of expensive elements like molybdenum and nickel in its alloy. This makes it worth a lot.



A high-nickel–molybdenum austenitic stainless steel with good corrosion resistance that was made for use in the handling of medium-concentrated sulfuric acid solutions was chosen (AISI 904L). This material is very easy to shape and weld, two of its features.

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Chemical Composition :

Weight % C Mn Cr Ni Mo N Cu S P
Min. 19,00 23,00 4.00 1,00
Max. 0,06 2,00 28,00 5,00 0,10 2,00 0,035 0,045

Mechanical Properties :

Yield strength Rp0.2,MPa Tensile strength Rm,MPa Elongation[%] Hardness[HB] Impact, Charpy-V, -196ºC[J]
ASTM A240 ≥ 230 520 – 720 ≥ 35 ≤ 90 60


AISI 904L is a high alloy low carbon austenitic stainless steel with good general corrosion resistance. EN 1.4539 is fully austenitic but is less sensitive to precipitation of sigma phase than conventional austenitic grades with high molybdenum content.

Areas of applications are process equipment in chemical industry, petrochemical industry, bleaching equipment in the pulp and paper industry, flue gas cleaning, desalination, seawater handling, hydrometallurgy, food and beverage, pharmaceuticals and heat exchangers.

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