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310MoLN
Material

 310MoLN, UNS S31050, W.Nr. 1.4466

Overview

310MoLN is a high-alloy austenitic stainless steel with nitrogen, it helps to stabilize and strengthen the austenitic phase, and does not have intermetallic phases such as intergranular carbide precipitations. The material has excellent resistance to corrosion in ammonium carbamate and nitric acid, including intergranular corrosion,  pitting and crevice corrosion. Also, 310MoLN offers good weldability with a fairly high embodied energy and a fairly low ductility, widely used in applications that require excellent strength, oxidation resistance, and resistance to chloride-induced stress corrosion cracking.

Application
  • Chemical and Petrochemical: Heat exchangers, reactors, furnaces, and tubes
  • Oil and Gas: Gas and oil pipelines, risers, and equipment
  • Power Generation: Boilers, superheaters, reheaters, and other components
  • Environmental Applications: Waste incinerators, flue gas desulfurization systems, and other environmental control equipment
  • Heat Treatment Furnaces: Radiant tubes, muffles, and other furnace components
  • Food Processing: Ovens, kilns, and other heat processing equipment
  • Aerospace Industry: Exhaust systems, combustion chambers, and other critical parts
Chemical Composition (%)
Material Cr P S Ni Si C Mn Mo
310MoLN 24.0-26.0 0.025 max 0.01 max 21.0-23.0 0.70 max 0.02 max 2.00 max 2.00-2.50
Mechanical Property
Material Tensile strength Yield strength 0,2 Elongation Hardness HB30
310MoLN 540-740 N/mm² 250 N/mm² 40% 95HB
Corrosion Resistance

310MoLN was originally developed for stripper tubes used in the production of urea, it has excellent general corrosion resistance in urea/carbamate solutions at high pressures and temperatures, and high resistant to inorganic acids. In addition, 310MoLN is also highly resistant to intergranular corrosion after welding, pitting and crevice corrosion. Compared to the conventional austenitic stainless steels of type 304 and 316, the 310MoLN with higher nickel content makes its slightly more resistant to stress corrosion cracking in in chloride- bearing solutions at temperatures exceeding about 60°C (140°F).

Heat Treatment

310MoLN is typically heat treated to enhance its mechanical properties and achieve the desired microstructure. Solution treatment or annealing can be done by rapid cooling after heating to around 1050-1150°C (1922-2102°F).

Heating and Pickling

Heating and pickling are common processes used for 310MoLN stainless steel to remove surface scale, oxide layers, and other contaminants. First, 310MoLN is heated at a certain temperature range to eliminate organic materials and facilitate the pickling process. Then, it undergoes pickling by immersing it in an acid solution, typically a mixture of nitric acid and hydrofluoric acid , to dissolve and remove scale and oxides. After pickling, thorough rinsing with water is performed to remove residual acid. Passivation, an optional step, may follow to enhance corrosion resistance.

Hot and Cold Forming

310MoLN stainless steel can be both hot and cold formed. It is important to consider the material's high strength and work-hardening characteristics during the forming processes. The recommended temperature range for hot forming of 310MoLN is typically between 1150-1260°C (2102-2300°F), this temperature range allows for better plasticity and reduces the risk of cracking during forming operations. However, cold forming is performed at room temperature and involves processes like bending, drawing, or stamping. Cold forming causes the material to work harden, and 310MoLN can work-harden more rapidly than standard austenitic stainless steels due to its high alloy content. Frequent annealing or intermediate heat treatments may be necessary during complex cold forming operations to restore the material's ductility.

Machining

Although machinable, the high alloy content and work-hardening characteristics of 310MoLN stainless steel makes machining difficult compared to standard austenitic stainless steels. During machining, cuttting tools preferably with high-speed steel or carbide inserts, to avoid dull edges cause excess work hardening.
 

Welding

310MoLN is good weldability, must be carried out without preheating, and normally there is no need for any subsequent heat treatment. 310MoLN has low thermal conductivity and high thermal expansion.

Product Forms
  • Bar & Rod
  • Plate & Sheet
  • Coil & Strip
  • Pipe & Tube
  • Fitting: Flange, Tee, Elbow, Reducer etc.
  • Forging: Ring, Shaft, Circle, Block etc.
Note

Ronsco is a supplier with more than 27 years of experience in the special metal field, we always adheres to the business phiosophy of "customer-centered", tries its best to meet the requirements of customers and pursues win-win cooperation with customers. Are you looking for special metal products one-stop supplier! Contact Us Now! Email: info@ronsteel.com

 

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Hunan Allianz Metal Products Co., LTD is a subsidiary company of Allianz Steel Group specializing in the supplies of special metal and related processing service, was established in 1996.
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