Description
40Cr is a medium carbon alloy steel containing chromium (0.8–1.1%). It offers better hardenability than 45 steel and exhibits excellent overall mechanical properties after quenching and tempering. However, its weldability is relatively poor and requires protective measures during welding.
Key Features
1. High strength and toughness (tensile strength ≥ 980 MPa after quenching and tempering) 2. Good hardenability (chromium enhances heat treatment performance) 3. Moderate wear resistance (which can be improved through surface hardening) 4. Preheating required for welding (prone to cold cracking)