Monel K500 Round Bar Supplier in India — N05500

Monel K500 (N05500) is the age-hardenable version of Monel 400 (N04400), with the same base composition of 65% nickel and 30% copper but with additions of 2.7% aluminium and 0.6% titanium that enable precipitation hardening. In the aged condition, K500 achieves yield strength of 690-1000 MPa — roughly 2-3 times stronger than Monel 400's 240 MPa. Monel 400 is supplied in the annealed or cold-worked condition and cannot be heat-treated to higher strength. Both alloys have similar corrosion resistance to seawater, hydrofluoric acid, and deaerated sulphuric acid. Choose K500 when high strength is required (shafts, fasteners, springs), and 400 when formability and weldability are more important.

Monel K500 is hardened through precipitation (age) hardening. The mechanism involves aluminium and titanium atoms combining with nickel to form gamma-prime (γ') Ni3(Al,Ti) precipitates within the nickel-copper matrix during controlled aging. The standard heat treatment is: solution anneal at 980°C (water quench), then age at 595°C for 16 hours (furnace cool to 540°C, hold 6 hours, air cool). This produces a hardness of 25-35 HRC and yield strengths of 690-1000 MPa depending on section size. The precipitates are coherent with the matrix, creating lattice strain that impedes dislocation movement. Larger cross-sections may show lower hardness due to slower cooling rates.

Yes, Monel K500 provides excellent resistance to flowing seawater, brackish water, and marine atmospheres — this is its primary application environment. The 65% nickel and 30% copper composition gives near-immunity to chloride stress corrosion cracking and very low general corrosion rates in seawater (less than 0.025 mm/year). It also resists biofouling better than most stainless steels. K500 is resistant to cavitation erosion due to its high hardness, making it ideal for pump shafts and propeller shafts. However, it can suffer accelerated corrosion in stagnant or low-velocity seawater due to differential aeration — it performs best in flowing conditions.

Monel K500 is generally considered non-magnetic in the solution-annealed condition, but can exhibit weak magnetic properties after age hardening depending on the exact composition and heat treatment. The Curie temperature is typically around -50°C to 0°C, meaning it is non-magnetic at normal operating temperatures. This low magnetic permeability (typically μ < 1.01 at 20°C) makes K500 suitable for applications requiring non-magnetic high-strength materials — such as drill collars for MWD/LWD (Measurement/Logging While Drilling) where magnetic interference must be avoided, and instruments in sensitive environments. However, for guaranteed non-magnetic requirements, material should be tested after final heat treatment.

Monel K500 round bar pricing in India typically ranges from Rs 2,500 to Rs 5,000 per kg depending on diameter, condition (annealed vs aged), quantity, and prevailing nickel/copper market prices. Smaller diameters (below 25mm) and precision-ground bars command higher per-kg pricing. Age-hardened bars ready for direct use carry a slight premium over solution-annealed material. The cost reflects the high nickel and copper content plus the specialized melting and forging required. Compared to Inconel 718, Monel K500 is significantly more economical while offering adequate strength for marine and oil & gas applications. Contact Creative Metal Industries at +91 99982 80619 for current pricing.

In oil & gas, Monel K500 is extensively used for non-magnetic drill collars (essential for MWD/LWD directional drilling tools), pump shafts and impellers in produced water service, valve stems and seats for sour service, blowout preventer components, safety valve springs, and downhole tool components. Its combination of high strength (age-hardened), excellent seawater/brine corrosion resistance, and non-magnetic properties makes it uniquely suited for these demanding applications. Per NACE MR0175, K500 is acceptable for sour service when hardness is controlled below 35 HRC. Creative Metal Industries supplies K500 bars specifically for oil & gas with full hardness certification and NACE compliance documentation.