钢丝的扭转性能是钢丝机械性能的重要指标。扭转试验是一个重要的工艺试验,试验简单、迅速。其应力状态软性系数(α=0.8)大于单向轴拉伸的强度试验(α=0.5)。这样,一些在拉力试验中抗拉强度高、延伸率很低的弹簧钢丝、制绳钢丝等品种,在扭转试验中就有可能处于韧性状态、在扭转断裂前发生塑性变形(切变),从而可对它们 Torsion performance of steel wire is an important indicator of mechanical properties. Torsion test is an important process test, the test is simple and rapid. The stress coefficient of softness (α = 0.8) is larger than that of uniaxial tension (α = 0.5). In this way, some varieties of spring steel wire and rope steel wire with high tensile strength and low elongation in the tensile test may be in a ductile state during the torsion test and undergo plastic deformation (shear) before the twisting fracture They can be