本SAE标准规定了对浅淬硬钢和中淬硬钢（但不包括通常空气硬化的深淬硬钢）进行淬透性测试和记录结果的程序。包括对中淬硬钢和浅淬硬钢使用25 mm（1英寸）标准淬透性端淬试样的程序，以及对直径小于32 mm（1-1/4英寸）的钢筋使用亚尺寸法的程序。SAE J1975中给出了确定渗碳钢表面硬化性的方法。在本文件中给出的条件以外的其他条件下进行的任何硬化性试验都不被视为标准试验，且应符合供应商和用户之间的协议。无论何时进行检查试验，所有相关实验室都必须安排使用相同的替代程序，参考试样和硬度试验的研磨方法。对于要求在一定范围内具有淬透性的连续钢热的淬透性常规测试，仅根据从淬火端到获得一定硬度的点的距离来指定淬透性就足够了。 该名称也可用于比较不同成分的钢，以查看它们是否具有相似的淬透性。以这种方式指定钢的淬透性极限是通过测量已被证明符合预期用途的钢的淬硬性来获得的。可通过这种方式将淬透性测试用作经验测试。对于缺乏制造经验的新部件，可有效地使用淬透性数据来估计任何给定钢提供的硬度分布。值得注意的是，在比较各种钢种或开发用于特定应用的新钢时，从化学成分预测淬透性的能力变得越来越重要。附录A中描述了一种这样的程序。其他淬透性预测方法可从第2节中的选定参考文献中获得。然而，应强调的是，任何淬透性预测程序的使用并不排除进行Jominy端的重要性- 淬火试验，以确定任何特定等级钢的实际淬透性。可使用淬透性数据来估计新机器部件中的任何钢可获得的硬度，该新机器部件尚未在生产中并且与可获得生产经验的任何部件不相似。在选定的参考文献第2.1节、第23节至第25节中描述了各种可硬化性应用方法。这些方法似乎都不精确，但它们通常用于估计目的。实际零件的最终相关性是必要的。

This SAE Standard prescribes the procedure for making hardenability tests and recording results on shallow and medium hardening steels, but not deep hardening steels that will normally air harden.Included are procedures using the 25 mm (1 in) standard hardenability end-quench specimen for both medium and shallow hardening steels and subsize method for bars less than 32 mm (1-1/4 in) in diameter. Methods for determining case hardenability of carburized steels are given in SAE J1975.Any hardenability test made under other conditions than those given in this document will not be deemed standard and will be subject to agreement between supplier and user. Whenever check tests are made, all laboratories concerned must arrange to use the same alternate procedure with reference to test specimen and method of grinding for hardness testing.For routine testing of the hardenability of successive heats of steel required to have hardenability within certain limits, it is sufficient to designate hardenability simply in terms of distance from the quenched end to the point at which a certain hardness is obtained. This designation may also be adequate for comparing steels of different compositions to see whether they have similar hardenability.Hardenability limits for specifying steel in this manner are obtained by measuring the hardenability of a steel which has proved satisfactory for the use intended. The hardenability test may be used in this way as an empirical test.For new components where manufacturing experience is lacking, hardenability data may be effectively used to estimate the hardness profile provided by any given steel. Attendantly, the ability to predict hardenability from chemical composition has become increasingly important when comparing various steel grades or developing new steels for specific applications. One such procedure is described inAppendix A. Other hardenability prediction methods are available from the selected references inSection 2. However, it should be emphasized that the use of any hardenability prediction procedure does not preclude the importance of conducting Jominy end-quench tests to determine the actual hardenability of any specific grade of steel.Hardenability data may be used to estimate hardnesses obtainable with any steel in new machine parts not yet in production and not similar to any parts on which production experience is available. Various hardenability application methods are described in the selected references, Section2.1, 23 to 25. It appears none of these methods are precise, but these are often useful for estimation purposes. Final correlation on actual parts is necessary.