MP35N: A Superalloy for High strength marine components

MP35N Alloy Typical Applications

• Downhole pump drive shafts and tools
• High strength marine components
• Springs
• Valve stems and pump shafts in Oil & Gas sector
• Fastener system components – pins, tension bolts, shear bolts, engine bolts, tie rods
• Medical applications – bone plates, screws, pins
• Non -magnetic electrical components and sensing devices
• Components in autosport
• Aerospace components

• MP35N cannot be strengthened by heat treatment alone
• The heat treatment of MP35N for oil and gas applications typically complies with the procedure in NACE MR0175
• Oil and gas applications typically use the chemistry and solution annealing limits in AMS 5844. Material is sometimes ordered to AMS 5844, then aged to comply with NACE MR0175. However, this is not a recommended practice as the cold work processes used in the mill for AMS and NACE MR0175-compliant material may be differentand hardness after ageing cannot be guaranteed to fall within NACE MR0175 limits.
• The second edition of API 20F was released in 2018 and governs bolting made from MP35N. Bolting manufacturers are required to purchase MP35N in the mill-heat-treated condition and no additional forging is allowed.
• Machining MP35N in the cold-worked-and-aged condition can be difficult but is readily done with the proper combination of feeds, speeds, cutting tools, and cutting fluids.
• MP35N can be welded easily, but the strength of the heat affected zone must be considered.