27MnB5 is a boron alloy steel known for its excellent hardenability and mechanical properties. It is typically used in applications where high strength and good formability are required. 27MnB5 has excellent hardenability, meaning that it can achieve high hardness and strength through heat treatment, particularly through quenching and tempering processes. Despite its high strength and hardness after heat treatment, 27MnB5 steel retains good formability. 27MnB5 is also weldable.