Rock Crusher Concave Ring

The Rock Crusher Concave Ring is the stationary wear liner that lines the crushing chamber of cone crushers used in mining, quarrying, and aggregate production. As rock is compressed between the mantle and concave at forces exceeding 500 tons, the concave surface must resist extreme abrasive and impact wear while maintaining precise chamber geometry for consistent product gradation. Ningbo Ruican manufactures this component using ZGMn13-1 Hadfield manganese steel (12-14% Mn) through investment casting, delivering the work-hardening wear resistance, chamber profile accuracy, and installation tolerance that crusher OEMs demand. The investment casting process produces the complex curved concave profile with minimal machining, reducing material waste and production cost.

Material Specifications

Manufacturing Process

1. Wax Pattern Injection: Large-format wax injection die for concave ring geometry (up to 1,500mm diameter)
2. Shell Building: 10–12 layer ceramic shell with fused silica and mullite for heavy-section manganese steel
3. Dewaxing & Firing: Controlled autoclave dewaxing, shell firing at 1050°C
4. Pouring: ZGMn13-1 manganese steel poured at 1450–1480°C under argon protection
5. Solution Treatment: Austenitizing at 1050°C for 2 hours, rapid water quench to retain austenitic structure
6. CNC Machining: Minimal machining — turning of mounting surfaces and locating slots only
7. Hardness Verification: Surface and core hardness testing to verify austenitic structure
8. Dimensional Inspection: CMM or template gauge verification of chamber profile
9. Inspection: Ultrasonic testing, dye penetrant, microstructure verification (austenite content > 95%)

Key Features

• Work-Hardening Wear Resistance: Hadfield manganese steel surface hardens to 450–550 HB under impact while maintaining tough austenitic core (200–240 HB)
• Investment Cast Profile: Complex curved concave geometry cast to near-net-shape, reducing machining by 60% vs. forged/sand-cast alternatives
• Solution-Treated: Water quenched from 1050°C to retain single-phase austenite, ensuring maximum work-hardening response
• Extended Service Life: Work-hardened surface provides 2–3× longer wear life than martensitic steel in high-impact crushing applications
• Large-Format Capability: Investment casting handles concave rings up to 120 kg and 1,500mm diameter
• Chamber Profile Accuracy: Cast-to-shape profile within ±0.5mm of design, ensuring consistent crusher throughput and product gradation

Application Fields

• Cone crusher concave liners (Metso HP/GP series, Sandvik CH/H series compatible)
• Gyratory crusher concave segments
• Jaw crusher cheek plates
• Impact crusher blow bars (similar material)
• Mining and quarrying primary/secondary/tertiary crushing
• Aggregate and concrete recycling crushing

Why Choose Ningbo Ruican

Ningbo Ruican’s 17+ years of Hadfield manganese steel investment casting, combined with IATF 16949 quality systems, delivers crusher wear parts that match or exceed OEM performance at competitive cost. Our solution treatment process ensures proper austenitic microstructure (>95% austenite) for optimal work-hardening response. We provide material certification, microstructure verification, and wear life guarantees for mining and aggregate customers worldwide.