1.1 本试验方法包括测量、分类和确定硬化和回火英寸系列钢螺栓、螺钉、螺柱、螺母和类似零件螺纹部分是否存在脱碳和渗碳的程序，这些零件已加热以便于制造或改变其机械性能。本试验方法不适用于有意渗碳以获得特定结果的产品。 1.2 描述了两种测量脱碳或渗碳极限并确定其存在的常规方法:光学法和显微压痕法1。两种方法均适用于常规检查。应将显微压痕方法2视为仲裁方法。 1.3 为了进行这些测试，有四类硬化和回火钢产品，必须对其物理性能进行具体测量。 1.4 以英寸-磅单位表示的值应视为标准值。本标准不包括其他测量单位。 1.5 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 4.1 脱碳和渗碳是有意或无意产生的两种表面条件- 在棒材轧制过程、棒材/线材退火过程或螺纹钢产品热处理过程中产生的现有条件。任何一种都过多都会对螺纹产品的安全性和性能产生不利影响。因此，已经为三种不同的产品组建立了限制:产品的拉伸强度越硬，越大，如果超过这些限制，产品就越容易失效。 4.2 当按照列出所用尺寸和显微压痕数据的特定产品规范进行测试时，该数据应优先于本测试方法中的表格。 4.3 只有两种可行的方法可用于检测这些缺陷，要么通过目视法，要么通过显微压痕法。当在产品样品的单个位置进行评估时，这两种方法都用于常规检查。 4.3.1 由于特定位置的评估可能不能代表整个零件，因此仲裁方法采用显微压痕法，作为对四个相邻螺纹进行评估的平均值。 与在单个线程上进行测试相比，此过程显著减少了随机测试变量。 4.4 规定该试验方法并不规定或暗示应仅针对脱碳或渗碳或两种条件进行试验。当采用任何一种测试方法时，这两种情况都将是明显的，并应予以报告。例如，如果下订单进行脱碳测试，但未发现任何脱碳现象，但检测到存在渗碳现象，则应在测试报告中报告发现了渗碳现象。

1.1 This test method covers procedures for measuring, classifying, and determining the presence of decarburization and carburization in the threaded section of hardened and tempered inch series steel bolts, screws, studs, nuts, and similar parts which have been heated to facilitate fabrication or to modify their mechanical properties. This test method is not intended to address products which are intentionally carburized to achieve specific results. 1.2 Two routine methods are described for measuring the limits of and determining the presence of decarburization or carburization—the optical method and the microindentation method 1. Either method is appropriate for routine examinations. The microindentation method 2 shall be considered the referee method. 1.3 For the purpose of these tests, there are four classes of hardened and tempered steel products for which specific measurements must be made with respect to their physical properties. 1.4 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 Decarburization and carburization are two surface conditions created, either intentionally or unintentionally, as with a pre-existing condition created during the rod rolling process, the rod/wire annealing process, or while heat treating threaded steel products. Too much of either will adversely affect the safety and performance of the threaded product. Therefore, limits have been established for three different product groups: the harder and greater the tensile strength of the product, the more susceptible to failure the product becomes if these limits are exceeded. 4.2 When testing to a particular product specification that lists the dimensions and microindentation data to be used, that data shall take precedence over the tables in this test method. 4.3 There are only two viable methods available to detect these deficiencies, either by the visual method or the microindentation method. Both methods are used for routine inspections when evaluations are conducted at a single location on the product sample. 4.3.1 Because an evaluation at a specific location may not be representative of the whole part, the referee method employs the microindentation method taken as an average of evaluations conducted on four adjacent threads. This procedure significantly reduces the random test variables when compared to testing on a single thread. 4.4 Specifying this test method does not specify or imply that testing shall be for either decarburization or carburization alone or for both conditions. When either test method is performed, both conditions will be apparent and shall be reported. For example, if an order is placed to test for decarburization and none is found, but the presence of carburization is detected, it shall be reported on the test report that carburization was found.