1。表面硬化钢制造的零件：通过什么样的科幻电影处理坚硬的耐磨表面层，柔韧适度的心部。如果齿轮传递扭矩，而必须有足够的强度，换挡过程中又承受冲击载荷又体系韧性，齿轮啮合过程中承受强烈的磨损，又有耐磨齿轮必须整体强度高，因此，“表硬里团”性能。

2。调质结构钢：许多重要零件，如轴类，螺丝等许多重要的链接，在承受大教次应力和冲击载荷等多种复合应力下工作，要求高强度和韧性的综合机械性能。为了实现上述要求，钢件必须经过淬火和高温回火处理（即调质处理）淬火、高温回火组织氏后得到的索氏体组织。调质钢的碳的量是中－0.5之间的低碳量不易淬火、回火后得到需要的高强度；低碳量是人性在使用中发生脆性断裂。

One Surface hardened steel parts: through what kind of science fiction film deal with a hard wear-resistant surface layer, a moderate heart. If the gear transmission torque, and must have enough strength, and the process of the impact of the impact load and the system toughness, gear meshing process in a strong wear, and wear resistant gear must be high overall strength, therefore, "table hard" performance.

Two Structural steel: many important parts, such as shaft, screw, and other important links, in the bearing of the great stress and impact load, and other complex stress, the requirements of high strength and toughness of the composite mechanical properties. In order to achieve the above requirements, the steel parts must be quenched and high temperature tempering treatment (i.e., quenching and tempering treatment) quenching, high temperature tempering after the organization of the. The amount of carbon in the quenched and tempered steel is that the low carbon content is not easy to quenching and tempering, and the need of high strength; low carbon content is the brittle fracture in the use of human nature.

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