What Is 904L Stainless Steel? Properties, Applications & SMLSCO Stock

904L stainless steel is a high-grade austenitic stainless steel containing elevated proportions of chromium (23%-28%), nickel (19%-23%), molybdenum (4%-5%), and copper (1%-2%). This composition enables it to perform exceptionally well in corrosive environments where standard stainless steels (such as 316L) struggle.

• High Corrosion Resistance: Its molybdenum and copper content effectively inhibits pitting corrosion and crevice corrosion, offering strong resistance to chemicals like sulphuric acid and chlorides.
• Durability: Withstands temperature variations from -40°C to 400°C, suitable for alternating hot and cold operating conditions.
• Excellent Weldability & Formability: Retains corrosion resistance without post-weld treatment. It can be welded into complex shapes while maintaining non-magnetic properties even after extensive welding or forming.

• Chemical Processing: 904L steel resists acidic environments and is commonly used in equipment exposed to corrosive chemicals, such as storage tanks and piping systems handling strong acids.
• Marine Environments: Suitable for shipbuilding and desalination plants, addressing rapid corrosion of standard stainless steels in saltwater and chloride-rich conditions.
• Oil & Gas: Employed in refinery heat exchangers and gas scrubbers, 904L withstands sulphides and high chloride concentrations, reducing equipment maintenance frequency.

SMLSCO supplies PED/ISO/AD2000/Norsok M650 certified 904L stock products with delivery within two weeks. Contact info@smlspipestock.com for product selection and quotations.