Lead-free brass alloy powder, lead-free brass alloy extruded material and its manufacturing method

摘要

Brass alloy powder has a brass composition formed by a mixed phase of ±-phase and ²-phase, and contains 0.5 to 5.0 mass% of chromium. The chromium includes a component that is solid-solved in a mother phase of brass, and a component that is precipitated at crystal grain boundaries.