无缝异型管的性能指数分析-塑性是指金属材料在载荷作用下，产生塑性变形(永久变形)而不破坏的能力。2. 无缝异型管的性能指数分析-硬度是衡量金属材料软硬程度的指针。目前生产中测定硬度方法最常用的是压入硬度法，它是用一定几何形状的压头在一定载荷下压入被测试的金属材料表面，根据被压入程度来测定其硬度值。常用的方法有布氏硬度(HB)、洛氏硬度(HRA、HRB、HRC)和维氏硬度(HV)等方法。
Performance Index Analysis of Seamless Profiled Pipe - Plasticity refers to the ability of metal material to produce plastic deformation (permanent deformation) without destroying under load. 2. Performance Index Analysis of Seamless Profiled Pipe-Hardness is the index to measure the degree of hardness and softness of metal materials. Pressure hardness method is the most commonly used method to measure hardness in production at present. It uses a certain geometric shape of the pressure head to press into the tested metal material surface under a certain load, and to measure its hardness value according to the degree of pressure. Common methods include Brinell hardness (HB), Rockwell hardness (HRA, HRB, HRC) and Vickers hardness (HV).
3. 无缝异型管的性能指数分析-疲劳
3. Performance Index Analysis of Seamless Profiled Pipe-Fatigue
前面所讨论的强度、塑性、硬度都是金属在静载荷作用下的机械性能指针。实际上，许多机器零件都是在循环载荷下工作的，在这种条件下零件会产生疲劳。
The strength, plasticity and hardness discussed above are all mechanical performance indicators of metals under static loads. In fact, many machine parts work under cyclic loads, under which fatigue occurs.
4. 无缝异型管的性能指数分析-冲击韧性
4. Performance Index Analysis of Seamless Profiled Pipe-Impact Toughness
以很大速度作用于机件上的载荷称为冲击载荷，金属在冲击载荷作用下抵抗破坏的能力叫做冲击韧性。
The load acting on the machine parts at a great speed is called impact load, and the ability of metal to resist damage under impact load is called impact toughness.
5. 无缝异型管的性能指数分析-强度
5. Performance Index Analysis-Strength of Seamless Profiled Pipe 强度是指金属材料在静荷作用下抵抗破坏(过量塑性变形或断裂)的性能。由于载荷的作用方式有拉伸、压缩、弯曲、剪切等形式，所以强度也分为抗拉强度、抗压强度、
Strength refers to the resistance of metal materials to failure (excessive plastic deformation or fracture) under static load. Because the load acts in the form of tension, compression, bending and shearing, the strength can also be divided into tensile strength, compressive strength, etc.
