MP35N/R30035 age hardening nickel cobalt based alloy
UNS R30035, AWS 110
AMS 5844 NACE ISO5832 Mr 0175 ISO 15156-3
MP35N is an age-hardened nickel-cobalt-based alloy containing 35% nickel, 35% cobalt, 20% chromium and 10% molybdenum. Work-hardened and age-strengthened to levels of 260-300 ksi (1790-2070 MPa), it has good ductility with over 40% area reduction and good toughness. Can be used effectively at low temperatures without embrittlement and without degradation in temperatures up to 600°F. Ultra-high strength and excellent corrosion resistance. MP35N is corrosion resistant in hydrogen sulfide, salt solutions and other chloride solutions. It also has excellent resistance to crevice corrosion and stress corrosion cracking in seawater and other harsh environments. Suitable for places requiring high strength, high modulus and good corrosion resistance.
Melting point (°C) 1440
Expansion coefficient 12.8 μm/m °C between 21 – 93°C
tensile strength approx.
springTensile strength Aged at 650 °C – 4 Hrs – A/C
Annealing 800 – 1000 N/mm2
MP35N spring Tensile strength 1400 – 1900 N/mm2
MP35N spring Tensile strength + aging 1900 – 2200 N/mm2
Rigidity modulus 80.7 kN/mm2
Modulus of elasticity 234 kN/mm2
MP35N can be used for tungsten gas maintenance welding. Overall, the welding capabilities of MP35N are similar to 304 stainless steel.
Welding parameters need to be adjusted to ensure that the heat input of each weld pass is low, which is about one-half or two-thirds of that of 304 material.
Research on gas tungsten arc welding shows that annealed materials have the highest welding efficiency. If fillers are required, match the chemical composition.
The annealing temperature of MP35N is 1038-1093°C, 1-4 hours, and then air-cooled.
After work hardening, MP35N can be aged at 427-649°C to increase strength. If the material is strengthened by the first processing, aging treatment can improve the strength. If aging annealed materials are aged again, their strength will not increase.
In order to optimize the mechanical function, MP35N needs to be aged at 538-593°C for 4 hours after cold working, and then air-cooled.
MP35N needs to be forged from 1177°C. To prevent surface cracking, deformation will no longer occur when the temperature is below 871°C.
The different strengths of MP35N are mainly obtained by mechanical processing. Both cold and hot processed materials can be machined. The temperature of the hot-processed workpiece should be kept below 427°C.
Work hardening can be achieved by drawing, rolling, extruding, forging, rotary forging or a combination of processing methods.
The strength and hardness are basically linearly increased with the cold work rate, while the ductility is inversely proportional to the cold work rate. However, the material maintains excellent ductility even with large deformations.
When confirming the strength of the material, it is necessary to consider that the strengthening effects of all deformation processing are superimposed. Therefore, the steel mill is not required to complete all the strengthening processing. Some strengthening can also occur during the machining step of processing parts into final products.
Any heat treatment condition of MP35N is difficult to machine. The machining parameters of MP35N are similar to Waspaloy, but better than Waspaloy.
MP35N alloy can be used in fasteners, springs, non-magnetic components and instrument parts in medical, seawater, oil and gas well, chemical and food processing process environments.
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