The thickness values
The thickness values, indicated in table, are valid for measurements done on carburised , hardened and and stress relieved surface not grinded. For the grinded surface keep a note of the grinding stock removed by grinding 回复 1# jixieman在渗碳、硬化、表面应力释放但没有经过研磨的前提下，表格里的厚度值才是有效的。对于已经研磨的表面，要对经过研磨损耗的研磨层厚度做一个记录。
供参看…… 回复 2# hooloo
看了你的翻译，对我帮助很大，非常感谢，还有一事相求，帮忙把剩下的一些也翻译了吧，:loveliness:
If on a hardened component there are grinded surface the drawing must indicate, besides indicating the hardness class, the minimum desired thickness on the grinded surface, keeping in view that as much you can reduce the grinding stock that much short can be the hardening process (see point 7).
The carbonitriding of classes Carbn 05 - Carbn 10 - Carbon 20 - Carbon 30 - Carbon 50 can substitute (but they cannot be substituted by) corresponding classes of carburising.
In general carbonitriding is preferred at carborising in presence of mechanical components on which deformations due to hardening treatment are made.
For teethed wheels the characteristics of the hardened surface are referred to the working surface of the teeth. (pitch diameter).
.NB For the helical teethed wheel the cut of the teeth , must be done at a 90º with respect to the direction of the teething with the objective of obtaining section of the piece for measurement of thickness of hardness. 回复 3# jixieman
如果在一个已经是研磨表面的硬质工件，图纸上必须注明，同时要注明研磨等级、研磨面期望的最小厚度，要着眼于尽可能多的减少可研磨层以缩短热处理工艺(见 point 7).
碳氮共渗等级Carbn 05 - Carbn 10 - Carbon 20 - Carbon 30 - Carbon 50 可替代相当等级的渗碳等级（反之则不可以）。
一般来说，对于只能通过硬化处理变形的机械部件，碳氮共渗处理优于渗碳处理。
对于齿轮，表面硬化层的性能被称为齿工作表面的性能. (pitch diameter).
第五段我没看明白，好像没头没尾。（参看部分……NB. 对于螺旋齿轮齿的切割，必须在90度方向完成；为了衡量硬化层厚度……） 回复 4# hooloo
谢谢，又遇到理解不透的英文了， For the classes Cmt 10 or Carbon 10 and higher, one must determine also a conventional thickness as distance between the external surface and the point where the Vickers hardness has a value of HV = 685 (HRC=~59),This thickness called “Macro thickness" must be between the limit values prescribed for each corresponding “Macroscopic“ class. The values of the effective thickness are indicated in the previous table corresponding to the various depth classes whose symbols are relative to thickness measured with the macroscopic method. Carburising
1° tenth C = 0.75 ~ 1.00
2° tenth and successive till a minimum value of depth of “Macro” class prescribed C = 0.65 ~ 0.90
这个啥意思啊 回复 6# jixieman
这个太专业了，不知道哦……以下参考
渗碳
1.碳势=0.75-1.00
2.按照碳层宏观等级深度，规定的最小碳势=0.65-0.90 回复 5# jixieman
（本段讲明的是有效渗碳层深度的测量问题，看看中文的吧，比较好理解……）以下供参看
对于C当量等级在10或碳含量达到10及其以上，在表面和距表面维氏硬度值达到685HV（-59HRC）的点之间必须确定一个常规厚度，这个厚度被称为宏观厚度，其必须在每一个相关宏观等级规定的值范围之内。与不同深度等级相关的有效厚度值如之前的表格中阐明，其与用宏观方法测量的厚度是相对的。 回复 8# hooloo
非常感谢，为什么要对表面要求一个宏观厚度呢，在图纸中已经要求有效硬化层深度了啊。很迷惑
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