Seamless Monel K500 Tube
Distinguished by the addition of Aluminum and Titanium, our Monel K500 tubing undergoes a controlled precipitation-hardening process, delivering triple the yield strength of standard Monel 400 while maintaining excellent ductility. These tubes are indispensable for mission-critical applications in subsea oil well components, marine propeller shafts, and centrifugal pump shafts. Through advanced cold-drawing and age-hardening treatments, GZH ensures every tube offers superior resistance to hydrogen embrittlement and stress-corrosion cracking (SCC) in sour-gas (H2S) environments.
"While Monel 400 provides excellent general corrosion resistance, Monel K500 is the definitive choice for applications requiring additional strength and hardness through precipitation aging."
What Is a Seamless Monel K500 Tube?
Seamless Monel K500 Tube is a cylindrical tube crafted from a single, solid billet of a nickel-copper alloy. Unlike welded tubes, it has no weld joint, ensuring superior structural integrity and reliability, especially under high-stress conditions. The"K500"designation signifies a specific version of the Monel 400 alloy that is precipitation-hardenable through the addition of aluminum and titanium. This unique composition provides significantly enhanced strength and hardness compared to Monel 400. It retains the same excellent corrosion resistance and non-magnetic properties while offering a combination of high strength and low corrosivity, making it a top choice for demanding applications.
Key Features and Advantages Seamless Monel Tube
Seamless Monel K500 Tube offer a unique combination of benefits that make them invaluable in the most demanding industries:
Exceptional Strength and Hardness: The addition of aluminum and titanium allows the alloy to be precipitation-hardened, resulting in high tensile strength and hardness, especially at cryogenic temperatures.
Excellent Corrosion Resistance: It retains the outstanding corrosion resistance of Monel 400, including resistance to rapidly flowing seawater, sour gas environments, and a wide range of acids and alkaline solutions.
Non-Magnetic and Spark-Resistant: The alloy is non-magnetic down to -129°C (-200°F) and is spark-resistant, making it safe for use in explosive environments.
High Pressure Tolerance: The seamless construction eliminates a potential weak point, allowing the tube to safely handle high internal pressures, which is critical in many high-stress processes.
Product Specifications and Data
To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for Monel K500.
Table 1: Chemical Composition of Monel K500
The enhanced strength of Monel K500 is a direct result of its aluminum and titanium content, which allows for precipitation hardening.
| Grade | C | Mn | S | Si | Ni | Cu | Fe | Ti | Al |
| Monel 400 | ≤0.3 | ≤2.0 | ≤0.024 | ≤0.5 | ≥63.0 | 28.0-34.0 | ≤2.5 | - | - |
| Monel K-500 | ≤0.2 | ≤1.5 | ≤0.015 | ≤0.5 | ≥63.0 | 27.0-34.0 | 0.5-2.0 | 0.3-1.0 | 2.2-3.5 |
Table 2: Typical Mechanical Properties of Seamless Monel K500 Tube
Seamless Monel K500 Tube is specifically designed to maintain its high strength and shape in high-stress applications.
| Tensile Strength | Yield Strength | Elongation | Hardness |
| ≥ 1100 MPa | ≥ 758 MPa | ≥ 20% | 26-32 HRC |
Table 3: Typical Physical Properties of Seamless Monel K500 Tube
These physical properties highlight the material's ability to perform reliably under a wide range of conditions.
| Density | Melting Point | Thermal Expansion | Thermal Conductivity | Modulus of Elasticity | Electrical Resistivity |
| 8.44 g/cm³ | 1315 - 1350 °C | 13.7 µm/m·°C (20-100°C) | 17.5 W/m·K (20°C) | 179 GPa | 0.62 x 10⁻⁶ Ω·m (20°C) |
| Nominal Outside Diameter, in. (mm) | Outside Diameter in. (mm) | Thickness of Specified Nominal Wall , % | Thickness of Specified Minimum Wall , % | |||
| Plus | Minus | Plus | Minus | Plus | Minus | |
| Over 0.400 (10) to 5/8 (16), excl | 0.005 (0.13) | 0.005 (0.13) | 15 | 15 | 30 | 0 |
| 5/8 (16) to 1 1/2 (38), incl | 0.0075 (0.19) | 0.0075 (0.19) | 10 | 10 | 22 | 0 |
| Over 1 1/2 (38) to 3 (76), incl | 0.010 (0.25) | 0.010 (0.25) | 10 | 10 | 22 | 0 |
| Over 3 (76) to 4 1/2 (114), incl | 0.015 (0.38) | 0.015 (0.38) | 10 | 10 | 22 | 0 |
| Over 4 1/2 (114) to 6 (152), incl | 0.020 (0.51) | 0.020 (0.51) | 12.5 | 12.5 | 28 | 0 |
| Over 6 (152) to 6 5/8 (168), incl | 0.025 (0.64) | 0.025 (0.64) | 12.5 | 12.5 | 28 | 0 |
| Over 6 5/8 (168) to 8 5/8 (219), incl | 0.031 (0.79) | 0.031 (0.79) | 12.5 | 12.5 | 28 | 0 |
Common Applications of Seamless K500 Tube
The combination of high strength, corrosion resistance, and non-magnetic properties of Seamless Monel K500 Tube makes them a preferred choice for:
Marine Engineering: In propeller shafts, pump shafts, and valve components for marine applications, where resistance to seawater corrosion and high strength are critical.
Oil and Gas Industry: Used in downhole tools, pump impellers, and valves for sour gas service and other corrosive environments.
Chemical Processing: In components for pumps and valves that must handle corrosive media and high pressures.
Aerospace: For structural parts that require high strength, corrosion resistance, and non-magnetic properties.
Manufacturing Process of Monel K500 Seamless Tube
The manufacturing of a Monel K500 seamless tube is a precise, multi-step process:
Heating: A solid billet of Monel K500 is heated to a high temperature.
Piercing: A piercing mill pushes a mandrel through the center of the heated billet to form a hollow shell.
Rolling and Sizing: The hollow shell is then rolled and drawn to reduce its diameter and wall thickness to the desired dimensions.
Finishing: The tube is cut to length, heat-treated, and subjected to finishing processes to ensure it meets the highest standards for performance and reliability in the most demanding applications. This meticulous process ensures that every Monel K500 seamless tube meets the highest standards for performance and reliability.
