Magnetic properties and structural evolution of the melt-spun Fe_80-xSi₂₀Cr_x and Fe_87.1-xSi_12.9Cr_x with Cr concentration are investigated for the as-cast and annealed samples. The coercivity at 300K of the as-cast alloys decreases and that of the annealed ones increases with Cr concentration. For both as-cast and annealed samples, the saturation magnetization and the magnetic ordering temperature decrease, although heat treatments cause an increase of these magnetic properties. We have explained the behavior of these concentration dependence based on the structural analysis. Low-Cr region displays a discontinuity in the coercivity curve of the annealed alloys, which can be attributed to the change of the short-range order to the transient long-range ordered state.