Patent ID: 8273193
Filing Date: 2012-09-25
Classification: C22C

Abstract:
1. A lead-free, bismuth-free free-cutting silicon brass alloy consisting of: 35.0 to 42.0 wt % Zn, 0.1 to 1.5 wt % Si, 0.03 to 0.3 wt % Al, 0.01 to 0.36 wt % P, 0.01 to 0.1 wt % Ti, 0.001 to 0.05 wt % rare earth metals selected from the group consisting of La and Ce, 0.05 to 0.5 wt % Sn, optionally 0.05 to 0.2 wt % Ni, optionally Mg, and the balance being Cu and unavoidable impurities, wherein the total zinc equivalent of Zn, Al, and Si does not exceed 45 wt %, and wherein Sb is present as an unavoidable impurity, and where that Sb is present in the amount of less than 0.04 wt %, wherein an elongation rate of casting of the alloy is greater than 10%, hardness of the alloy is in a range of HRB 55 to 75, and a bending angle of strip samples of the alloy is more than 55°.