904L Super Austenstic
Stainless Steel(1.4539,UNS N08904)
904L is a high-alloy austenitic stainless steel with low carbon content. The grade
is intended for use under severe corrosive conditions. It has been application
proved over many years and was originally developed to resist corrosion in dilute
sulfuric acid. It is standardized and approved for pressure vessel use in several
countries. Structurally, 904L is fully austenitic and is less sensitive to precipitation
ferrite and sigma phases than conventional austenitic grades with high molybdenum
content. Characteristically, due to the combination of relatively high contents
of chromium, nickel, molybdenum and copper 904L has good resistance to general
corrosion, particularly in sulfuric and phosphoric conditions. Chemical
Composition % C Cr Cu Mn Mo Ni P S Si 0.02 19.0-23.0 1.0-2.0 2.0
4.0-5.0 23.0-28.0 0.045 0.035 1.0
TYPICAL
APPLICATIONS Production and transport
of sulfuric acid Metal pickling in sulfuric acid Production and concentration
of phosphoric acid Use in seawater, brackish water, condensers, heat exchangers
and pipe work in general Paper and allied industries Gas washing Chemical
and pharmaceutical industries
TENSILE
REQUIREMENTS Tensile Strength (KSI) 70 Yield Strength (KSI) 25
KSI can be converted to MPA (Megapascals) by multiplying by 6.895. |