Nimonic 90 Bolts And Nuts

Superalloys typically have the following advantages:

• High temperature strength: it can still maintain high strength at high temperature, and it is not easy to deformation or fracture, which can ensure the stability of the connection.
• Oxidation resistance: It has good antioxidant capacity, even if used for a long time at high temperature, it is not easy to be oxidized, thus extending the service life.
• Corrosion resistance: Excellent performance in a variety of corrosive environments, such as hot acid, chloride-containing environments, with excellent resistance to comprehensive and local corrosion, including stress cracking corrosion resistance is also prominent. It can cope with the common corrosion problems in chemical industry, petroleum and other fields, and reduce the maintenance and replacement cost of equipment.
• Good welding performance: It can achieve good welding with other materials at high temperature, the weld is firm, and the performance after welding is comparable to that of the base material.
• Wide range of application: can be widely used in aerospace, petrochemical, electric power and other materials demanding high temperature, high pressure and corrosive industrial fields.

    For example, the main components of Monel 400 (UNS N04400 / W.Nr.2.4360 / Alloy400) superalloy bolts and nuts are carbon (C) ≤0.30, nickel (Ni) ≥63.0, silicon (Si) ≤0.5, sulfur (S) ≤0.024, iron (Fe) ≤2.5, and nickel (Ni) ≥63.0. Manganese (Al) ≤2.0, copper (Cu) 28.0 ~ 34.0. Its performance advantages are as follows:
In terms of physical properties, the density is 8.9g/cm³, the melting point is 1300-1350℃, and it is non-magnetic.
Mechanical properties, tensile strength σb≥480MPa, yield strength σb≥195MPa, elongation δ≥35%, hardness HB135-179.
In terms of corrosion resistance, it has excellent corrosion resistance in fluorine gas, hydrochloric acid, sulfuric acid, hydrofluoric acid and their derivatives; It is more corrosion resistant than copper-based alloy in seawater. In the concentration of less than 85% of sulfuric acid are resistant to corrosion, is one of the few important materials can be resistant to hydrofluoric acid; In most cases of water corrosion, not only excellent corrosion resistance, but also pore corrosion, stress corrosion, etc. are rarely found, and the corrosion speed is less than 0.025mm/a; The highest temperature of continuous work in the air is generally about 600℃, and the corrosion rate is less than 0.026mm/a in high temperature steam; Due to the high nickel content, it can resist the corrosion of anhydrous ammonia and ammoniation conditions below 585℃.
For example, ASTM A453 Grade 660 superalloy bolts are American standard nickel-based superalloys. It is Fe-25Ni-15Cr based superalloy, adding molybdenum, titanium, aluminum, vanadium and trace boron comprehensive strengthening. The alloy has high yield strength and persistent creep strength below 650℃, and has good working plasticity and satisfactory weldability. It is suitable for the manufacture of high-temperature bearing parts of aircraft engines that work below 650 ° C for a long time, such as turbine discs, compressor discs, rotor blades and fasteners, etc., and is also widely used in automotive engines, as well as in space engines and space shuttles.

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