904L/UNS N08904/EN 1.4539 Stainless Steel
904L stainless steel pipe, 904L steel sheet
904L (UNS N08904, 1.4539) is a highly alloyed austenitic stainless steel. Its approximate composition is 20% Cr, 25% Ni, 4.0% Mo plus 1.5% Cu, which ensures a pitting resistance equivalent number (PREN) of around 43. It was specifically developed for service in sulphuric acid, mostly in concentrations from 20% to 85%.
904L is austenitic stainless steel. In comparison to 316L, its molybdenum addition gives it superior resistance to localized attack (pitting and crevice corrosion) by chlorides and greater resistance to reducing acids and in particular, its copper addition gives it useful corrosion resistance to all concentrations of sulphuric acid. Its high alloying content also gives it greater resistance to chloride stress corrosion cracking, but it is still susceptible. Its low carbon content makes it resistant to sensitization by welding and prevents intergranular corrosion.
UNS designation: UNS N08904
JIS Equivalent: QS 2025 MC
EN/DIN Numerical Equivalent: EN 1.4539
EN/DIN Symbolical Equivalent: X1NiCrMoCu25-20-5
Available Forms and Specifications
904L seamless pipe/tube: ASTM B677, ASTM A312, ASTM A 213, ASTM A269
904L welded pipe/tube: ASTM A312, ASTM A358 904L Welded pipe
904L stainless steel plate/sheet/coils: ASTM A240, ASTM A480
904L pipe fittings: ASTM B366 bend, ASTM A403,ANSI B16.9
904L Stainless Steel Fasteners: ASTM A479
|Ni||Cr||Mo||C max||Mn max||Si max||Cu||S||P||N max|
|Tensile strength, min, Mpa||490|
|Yield strength, 0.2% offset, min, Mpa||216|
|Hardness, (HR B)||90|
- Petroleum and petrochemical equipment, such as reactors;
- Storage and transportation equipment of sulfuric acid, such as heat exchanger;
- Gas desulphurization equipment in power plant, such as absorber tower body, flue, door plate, internal parts, spray system;
- Scrubber and fan in an organic acid treatment system.
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