Manganese steel has been a staple in the production of crusher wear parts for many years due to its unique work-hardening properties. When rocks come into contact with the manganese steel surface, its outer layer hardens. This creates a material that is significantly more resistant to wear during operation and capable of withstanding higher impact forces than other alloys. ACE Machinery supplies the high-quality manganese steel wear parts for cone crushers and jaw. Precision Fit. Resilient Strength. Enduring Performance.