选定的合金钢受限制的淬透性带

[中文适用范围]： 受限淬透性钢已经使用了一段时间，但特定牌号的具体限制取决于客户需求，并且因工厂而异。这种钢需要为关键部件提供更受控的热处理响应和尺寸控制。由于人们对有限淬透性钢的兴趣日益浓厚，SAE钢铁技术委员会指示第8部门准备了一套有限淬透性钢的标准。 1993 年，美国材料试验协会 (ASTM) 采用了 12 种 SAE 限制淬透性钢，并增加了 10 种。 SAE 决定将另外 10 种钢材纳入 SAE J1868。一般来说，淬透性受限的钢（RH 钢）在端面淬透性棒材的初始位置处的硬度范围不大于 5 HRC，并且不大于标准 H 型带钢（SAE J1268）在“拐点”区域。通常，受限淬透性带位于相应标准 H 带的中间。 SAE 4140 给出了 RH 频段与标准 H 频段对比的示例。 [外文原描述]： Restricted hardenability steels have been in use for some time but the specific restrictions for a particular grade depend upon customer needs and vary from mill to mill. Such steels are desirable to provide more controlled heat treatment response and dimensional control for critical parts. Because of increasing interest in steels with restricted hardenability, the SAE Iron and Steel Technical Committee directed Division 8 to prepare a set of standard steels with restricted hardenability.In 1993, the American Society for Testing and Materials (ASTM) adopted the twelve SAE restricted hardenability steels and added ten more. SAE decided to include in SAE J1868 the additional 10 steels.In general, steels with restricted hardenability (RH steels) will exhibit a hardness range not greater than 5 HRC at the initial position on the end-quench hardenability bar and not greater than 65% of the hardness range for standard H-band steels (see SAE J1268) in the "inflection" region. Generally the restricted hardenability band follows the middle of the corresponding standard H-band. An example of the RH band compared with the standard H-band is given for SAE 4140 in Figure 1 .Cross Reference: ASTMA914,ASTME112,J1268,J404,J406,J409_202107