Stainless Steel Grade AISI 317LMN | EN 1.4439 | DIN X2CrNiMoN17-13-5

AISI 317LMN | EN 1.4439 | DIN X2CrNiMoN17-13-5 - austenitic stainless steel which is an improved austenitic version of steel grades AISI 316 and AISI 317. It has a higher content of nickel, molybdenum and nitrogen in its composition, which significantly increases the product's resistance to pitting and crevice corrosion.

AISI 317 LMN | EN 1.4439 - austenitic-ferritic chromium-nickel-molybdenum stainless steel. Resistant to chlorine concentrations.

Stainless steel AISI 317LMN provides high corrosion resistance in acidic chloride-containing environments compared to stainless steel AISI 316L and AISI 317L. It is austenite with a high molybdenum content. Alloyed with nitrogen. The higher the molybdenum content, the greater the corrosion resistance of the alloy, mainly in an environment containing acid chlorides. The mixture of nitrogen and molybdenum also increases the resistance of the alloy to pitting and crevice corrosion. The steel is non-magnetic in the annealed condition. Compared to other standard stainless steels, it has a higher creep, which provides resistance to tearing and tensile strength at elevated temperatures.

Welding

The steel has excellent weldability. The weld seam is free of chromium carbide deposits at grain boundaries due to its low carbon content. This material can be easily welded and processed by standard factory manufacturing methods. Low-carbon filler metals are typically used to create a fusion zone with corrosion resistance similar to that of the base metal.

Hardening

Only cold working, not heat treatment, can strengthen the alloy.

Cold processing

This grade is relatively easy to form and fabricate into parts using the full range of cold working operations that are used for normal austenitic stainless steels. It can be used for heading, drawing, bending and upsetting. Due to its nitrogen content, EN 1.4439 will be slightly stronger and will harden slightly faster than AISI 316L stainless steel.

Forging

Can be hot stamped in the range of 925 °C - 1200 °C. For maximum corrosion resistance, parts that have been hot stamped should be subsequently annealed at a minimum temperature of 1040 °C and water quenched or rapidly cooled by other means.

Machinability

This is a very tough austenitic stainless steel that is susceptible to strain hardening during deformation and is resistant to chip breaking. Higher molybdenum and nitrogen content makes the chips abrasive, increasing tool wear. The best machining results are achieved with lower speeds, heavier feeds, excellent lubrication, sharp tools and powerful equipment.

Mechanical properties

Physical properties

Application

In a wide range of chemicals, this stainless steel provides excellent corrosion resistance. It is resistant to hydrochloric acid, sulfuric acid, phosphoric acid, and chlorine. It will be useful when working with fatty acids and hot organic substances often present in pharmaceutical and food products.

Steel has found its application in the chemical, energy, cryogenic, petrochemical, pulp and paper industries, as well as in contact of food products with chlorides and exposure to high temperatures. It is used for the production of special pumps, installations, radiators, devices, heat exchangers or tanks for chemicals - sulfuric, formic, nitric, acetic or sodium acid in the form of rods, forgings, sheets and pipes.