|
|
发表于 2008-11-29 19:11:27
|
显示全部楼层
来自： 中国北京
QQ-N-290是美国的电镀镍标准 L" t7 |( L4 z% l# ~# H
CLASS和GRADE 的意义如下：
5 D0 G A1 }! ^! D6 TClass 1 Corrosion protective plating
2 R7 Z/ s/ [0 sClass 2 Engineering plating( O; t3 k% T9 h6 X8 ]; _! |
6 e5 M, ^3 ~: C& h. a# v: P; W
Grades- Class 1 plating shall be of the following grades/ t* a' _' X0 B4 E5 M- i
Grade A 0.0016 inch thick: C" n( @$ O3 b5 ]' F" B
Grade B 0.0012 inch thick
Z( a. T, F6 ^4 WGrade C 0.0010 inch thick
" r, J' d5 V( {* `- _4 K. X' {Grade D 0.0008 inch thick
+ k3 e' I7 `$ p. X) n$ NGrade E 0.0006 inch thick
4 o) T( f, k, u9 o9 ZGrade F 0.0004 inch thick
: L }$ ?& Q B' Z- IGrade G 0.0002 inch thick |
|
