MP35N: A Superalloy for High strength marine components
2024-08-14
MP35N is a vacuum induction, vacuum arc re-melted quaternary alloy based on nickel and cobalt with substantial additions of chromium and molybdenum. The alloy possesses an unusually attractive combination of ultra-high strength, toughness and outstanding corrosion resistance. MP35N alloy may be employed in the annealed condition but can easily be work strengthened to tensile strength levels in excess of 260 ksi (1,793 MPa) with the retention of good ductility. Aging of worked material causes precipitation hardening and can raise the tensile strength by an additional 40 ksi (276 MPa). The density of MP35N alloy is 8.43 g/cc.
MP35N Nickel-Cobalt-Chromium-Molybdenum Alloy
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 possesses excellent corrosion resistance in harsh environments including seawater, chloride brines, sweet gas, and sour gas. MP35N is the highest strength alloy approved in NACE MR0175 for use in sour service. MP35N derives its strength from a combined cold-work and heat treatment process.
- 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.
Lork Group is a reputable manufacturer and supplier of high-quality MP35N alloy steel bars in China. Renowned for our dedication to excellence, we specialize in producing durable nickel alloy products to meet diverse industrial needs. With a commitment to superior quality, we ensure our bars meet strict standards, making us a trusted choice in the industry.
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