Bars/Rods

Common Classifications

Based on alloy composition and performance characteristics, nickel-based alloy bars can be categorized into solid-solution strengthened type, age-hardened type, and precipitation-hardened type. Typical alloy grades include Inconel 600, Inconel 625, Hastelloy C-276, and Carpenter 20.

Processing Parameter Specifications  

Surface Roughness: The surface roughness of nickel-based alloy bars must be maintained within the range of Ra 0.4–1.6 μm. This parameter ensures optimal surface smoothness, minimizing the adhesion of corrosive media due to surface irregularities during service, thereby reducing corrosion risks. Additionally, it enhances sealing performance and fitting accuracy when interfacing with other components. For instance, in precision mechanical transmission components, lower surface roughness reduces frictional wear and extends equipment service life.  

Straightness: The permissible deviation must be **≤0.1 mm/m**. Superior straightness is critical for maintaining dimensional accuracy during subsequent machining processes (e.g., cutting, turning, assembly). For long-sized components requiring integrated assembly, such as shaft parts, inadequate straightness may induce operational vibrations, eccentricity, and other issues, compromising equipment stability and safety.  

Application Example of a Typical Grade: Monel K500 for Marine Shafting  

Alloy Properties: Monel K500 is a precipitation-hardenable nickel-copper alloy, enhanced with aluminum and titanium additions based on Monel 400. Through aging treatment, it achieves superior strength and hardness while retaining Monel alloys' exceptional resistance to seawater corrosion, demonstrating robust performance in environments exposed to seawater, salt spray, and marine atmospheres.  

Application in Marine Shafting: Marine shafting, a core component of ship power transmission, operates under prolonged seawater immersion while enduring significant torque and impact loads. Monel K500 bars, owing to their high strength, outstanding seawater corrosion resistance, and fatigue performance, are an ideal material for marine shafting. Post-machining surface roughness and straightness meet the stringent precision requirements for shaft assembly, ensuring efficient and stable power transmission while mitigating failures caused by corrosion or deformation.