Category Archives: MP35N

MP35N

MP35N Fasteners

One of the materials that Hague Fasteners are increasingly manufacturing in is ‘MP35N’.
MP35N alloy is a nonmagnetic, nickel-cobalt-chromium-molybdenum alloy possessing a unique combination of ultrahigh tensile strength (up to 300 ksi [2068 MPa]), good ductility and toughness, and excellent corrosion resistance.
MP35N fasteners are made for many applications in many industries like oil and gas, aerospace and even the subsea industry. MP35N can also be effectively used at cryogenic temperatures without embrittlement whilst keeping its properties at temperatures up to 600°F. MP35N is able to resist corrosion to most mineral acid, hydrogen sulphide and seawater environments whilst exhibiting excellent resistance to stress corrosion cracking and hydrogen embrittlement, even at high strength levels. It is a material that Hague Fasteners have seen growth in demand during the last 12 months.
Some of the typical uses of MP35N in various industries are as follows:
Downhole Pump Drive Shafts and Tools
High Stength marine Components
Valve Stems and Pump Shafts
Fastener system components like pins, shear bolt and Engineering Studs and Hex Bolts.
MP35N fasteners can be hot and cold worked and formed by a wide variety of processes. Work strengthening can be accomplished by processes such as extruding, rolling, swaging and drawing. It can also be TIG welded, its weldability is actually similar to Type 304 Stainless Steel.

MP35N

The machinability of MP35N is similar but better than that of Waspaloy which is a widely used standard for Nickel-Cobalt-Chromium base alloy machining performances, which makes this material more reliable and higher quality.
Some of the standards available for MP35N fasteners are as follows:
UNS R30035
AMS 5758 – MP35N® VIM-VAR Bar
Solution heat treated @1900-1925°F for 4 to 8 hours
AMS 5844 – MP35N® VIM-VAR Bar
Solution heat treated @1900-1925°F for 4 to 8 hours and Work Strengthened
AMS 5845 – MP35N® VIM-VAR Bar
Solution heat treated @ 1900-1925°F for 4 to 8 hours, Work Strengthened & Aged @ 1000-1200°F for 4 hours
NACE MR0175
ASTM F-562
BS 7252-6
ISO 5832-6

The chemical composition for MP35N is as follows
Ni 35%
Co 35%
Cr 20%
Mo 10%

Physical properties associated with this alloy:
DENSITY 8.43 g/cm3 0.304 lb/in3
MELTING POINT 1440oC 2625oF
COEFFICIENT OF EXPANSION 12.8 µm/m °C
(20 – 100°C) 7.1 x 10-6 in/in °F
(70 – 212°F)
MODULUS OF RIGIDITY 80.7 kN/mm2 (11705 ksi)
MODULUS OF ELASTICITY 234 kN/mm2 (33939 ksi)

Some of the products Hague Fasteners can manufacture are but not limited to:

MP35N Fasteners
MP35N Socket Capscrews
MP35N Hex Bolts (normal and Heavy Series)
MP35N Hex Nuts (normal and Heavy Series)
MP35N Pins
MP35N Custom Fasteners
MP35N Socket Shoulder Screws
MP35N Eng Studs
and many more.

It is because of high quality steels like MP35N that Hague Fasteners can produce the highest quality components for our customers and ensure they are satisfied with every part of their order and service received.

MP35N, non-standard fasteners, Petrochemical Fasteners, Precision Engineering, Special Fasteners, Subsea

MP35N Fasteners

MP35N Special Fasteners Focus For Subsea & Offshore Oil and Gas Engineering.

MP35N (Ni Co Cr Mo 35 35 20 10)
is a nickel-cobalt base alloy that is often specified in subsea special fastener designs due to its unique combination of properties – ultra high strength, toughness, ductility and outstanding corrosion resistance.

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Hague Fasteners’ manufactured critical special fasteners are, by virtue of the alloy, work strengthened and finally aged to obtain strength levels of 260 to 300 ksi (1793-2086 MPa) in its full strength condition. With less cold work reduction, the alloy has the best balance of strength and stress corrosion cracking resistance (SCC) for harsh environments.

Hague’s MP35N custom fasteners resist corrosion in hydrogen sulfide, salt water and other chloride solutions, as well as the mineral acids (nitric, hydrochloric, sulfuric). In addition, all critical manufactured special fasteners exhibit exceptional resistance to crevice corrosion cracking in seawater and other hostile environments hence being a popular choice for high integrity applications in offshore and subsea industries.

HEAT TREATMENT (AGING)
MP35N should be aged at the temperature required to achieve the final properties desired. The amount of cold work in MP35N defines the recommended aging treatments.

For AMS 5844 (full strength/ heavily cold worked) material, the alloy should be aged at 1000°F – 1200°F for 4 hours.

For optimum sulfide SCC resistance, less-heavily cold worked material can be aged at 1300°F or 1350°F for 4 hours or at 1425°F for 6 hours as indicated in NACE MR-0175. The 1425°F aging treatment provides the best sulfide SCC resistance, but at the expense of strength.

Exposure to temperatures much above the recommended aging temperatures may result in a significant (and non-recoverable) loss in strength caused by the reversion of the cold-worked metallurgical structure to the much softer annealed structure.

Hague Fasteners are manufacturing every type of conceivable special fasteners and turned components for use in Downhole pump drive shafts assemblies and associated tooling.
High strength special fasteners for marine components.
Seawater Valve stems and pump shafts in Oil & Gas sector and desalination systems.
Fastener system components – pins, tension bolts, shear bolts, engine bolts, tie rods and all critical high integrity corrosion resistant bolts.
Miniature fasteners and micro screws for Medical applications – bone plates, screws, pins.
Fastener Components for use in Autosport & Aerospace.

SPECIFICATIONS
MP35N
AMS 5758
AMS 5844
AMS 5845
ASTM F562
ASTM F688
NACE MR01-75
ISO 15156