Cobalt-Based Alloy Rocker Arm & Valve Actuator Shaft Precision Casting

Cobalt-Based Alloy Rocker Arm & Valve Actuator Shaft Precision Casting

Where extreme wear, high temperature, and corrosive conditions converge, cobalt-based alloy castings stand apart. Our precision cast rocker arms and valve actuator shaft components in cobalt-based alloy (Stellite®-equivalent grades) deliver unmatched hardness, wear resistance, and thermal stability — making them the material of choice for the most demanding valve actuation and mechanical linkage applications in oil & gas, power generation, and aerospace industries.

Material Properties

• Alloy grades available: Cobalt-based alloy equivalent to Stellite® 6, Stellite® 12, Stellite® 21, or custom composition
• Hardness: 36–45 HRC (grade dependent) — exceptional resistance to abrasive and adhesive wear
• Tensile Strength: 700–900 MPa (grade dependent)
• Operating Temperature: Retains hardness and strength up to 800–900°C
• Corrosion Resistance: Excellent in oxidizing acids, seawater, and high-temperature oxidizing environments
• Galling Resistance: Outstanding resistance to metal-to-metal galling and fretting wear
• Biocompatibility: Selected grades suitable for medical and food-contact applications

Casting Process & Quality

• Process: Lost-wax investment casting for near-net-shape complex geometry
• Dimensional Tolerance: CT6 per ISO 8062
• Surface Roughness: Ra 3.2–6.3 μm as-cast; grinding and polishing available for critical wear surfaces
• Post-processing: CNC grinding of bearing journals and seating surfaces; hard facing overlay available
• NDT options: Dye penetrant testing (PT), fluorescent penetrant inspection (FPI), hardness verification
• Microstructure control: Controlled cooling for optimal carbide distribution and wear performance

Key Features

• Extreme wear resistance: Cobalt-chromium carbide microstructure provides superior resistance to abrasion, erosion, and metal-to-metal wear
• High-temperature stability: Maintains hardness and dimensional integrity at temperatures where stainless steels soften
• Galling-free performance: Ideal for sliding contact applications where conventional steels would seize or gall
• Corrosion and oxidation resistant: Performs reliably in aggressive chemical and high-temperature oxidizing environments
• Long service life: Significantly extends component replacement intervals compared to stainless steel alternatives
• Custom alloy selection: Grade recommended based on your specific wear, temperature, and corrosion requirements

Applications

• Valve rocker arms and actuator linkage components
• Ball valve stems and trunnion shafts
• Gate and globe valve actuator shafts
• High-temperature furnace and kiln valve components
• Oil and gas wellhead and choke valve parts
• Power generation turbine valve components
• Pump wear rings and shaft sleeves
• Aerospace and defense actuation components

Custom Order Process

1. Submit your drawing (STEP, DXF, DWG, PDF) with operating conditions (temperature, media, load)
2. Alloy grade recommendation from our engineering team
3. Receive detailed quotation within 24–48 hours
4. Prototype and hardness verification before mass production
5. Lead time: typically 35 days depending on alloy grade, complexity, and quantity

Facing extreme wear or high-temperature challenges? Contact us for a custom quote — our metallurgical team will recommend the optimal cobalt alloy grade for your application.