317LMN Stainless Steel Sheet & Plate

317LMN stainless steel is a highly alloyed version of 317 stainless steel, designed to offer enhanced corrosion resistance, particularly in harsh chemical environments. This alloy contains significant amounts of molybdenum (up to 4%), along with higher levels of nickel and manganese, making it superior to other stainless steel grades like 316 or 317 in terms of resistance to pitting, crevice corrosion, and stress corrosion cracking, especially in chloride environments. It is commonly referred to as a “super-austenitic” stainless steel, suitable for extreme conditions.

Key Features

• Corrosion Resistance: 317LMN offers exceptional resistance to a wide range of corrosive environments, including those involving chlorides, sulfuric acid, and phosphoric acid. The high molybdenum and nickel content provide enhanced resistance to pitting and crevice corrosion.
• Stress Corrosion Cracking Resistance: This alloy performs well in environments prone to stress corrosion cracking, which makes it ideal for applications in chemical processing and marine environments where such stresses are common.
• High-Temperature Resistance: 317LMN stainless steel maintains its strength and resistance to oxidation even in elevated temperature environments (up to approximately 870°C).
• Mechanical Properties: It offers excellent tensile strength and durability while maintaining good formability. The alloy’s mechanical properties make it suitable for both welded and high-stress applications.
• Weldability: 317LMN can be welded using standard methods, though preheating and post-weld heat treatments may be necessary to minimize the risk of sensitization and ensure long-term durability.

Technical Specifications:

• UNS Number: S31603
• DIN/EN Designation: 1.4404