1、 ENGINEERING STANDARDS Test Procedure LIMITED USE EDS-T-7126 Method of Measuring Soft-Nitriding Depth Do Not Use on New Program; No Replacement. 7$:G G?i 8 ?U9I - Note: 8 E:48t G8 =97 FF7 957%L+ , FG P-P Program 72P# 957%L: 6#$ . Copyright 2011 General Motors Company All Rights Reserved July 2011 Or
2、iginating Department: GM Korea Engineering Standards Page 1 of 5 Version : 4 1 Scope Note: Nothing in this standard supersedes applicable laws and regulations. Note: In the event of conflict between the Korean and English language, the Korean language shall take precedence. 1.1 Purpose. The standard
3、 aims at helping test personnel perform the test in an appropriate method by describing the methods of measuring soft-nitriding depth for steel surface. 1.2 Applicability. This standard specifies the method of measurement for chemical compound layer thickness depth of diffused layer and surface hard
4、ness of the soft-nitriding product. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. None 2.3 Additional References. None 3 Resources 3.1 Test Piece. 3.1.1 The test piece shal
5、l in principle be the one cut out from the soft-nitriding product, however, steels of the same grade, which is soft-nitrided under the same condition as that of product may be used as test piece. 3.1.2 For initial sample approval purposes, at least 3 test pieces shall be tested and for routine quali
6、ty control, at least 1 test piece shall be tested. 3.1.3 Preparation Method of Test Piece. 3.1.3.1 Cut the test piece at right angle to the surface. At this time, be careful lest the heat should occur. 1 P7 :0 : ., E:48 6 7$*F7 1GFp*0 $)2e (Porosity) ?i8x 9PF$ . 4.2.3.2 /x3 (Vickers) $d) E+$* ?U9IF$
7、 . 8& /x3 (Vickers) $d8 F:E8t E 17 &d*$ . Table 1: The Load of Vickers Hardness / E 1: E+$ ?U9I4 I97 &d* /x3 $ F:E Steel grade / I9 Soft-nitriding treatment period / 7$:G =* 48 Within 90 minutes / 90. -,+ 90 minutes min. / 90. 81 Steel for structural use / 97I Carbon steel, Alloy steel / A2I , F7.7
8、GI2e%L# $)2e (porosity)8 :G?i8x +F$ . GF,p ?i : 7$:G =* G 9PE8 E+7 GI2e%L# :G ?i8x 8-,F# 8p) , .4 (Etching) 4A G , G8-, 4=d4 -e1 ?i8p) .(8$ . G1 ?i : 9PE8 E+0 4 . 187 98F# :2 G1?i8x +F$ . E+ $ : GF,p ?i8 E+ $* +F$ . 7.2 66 -C dGl . F$-1F 68 . 8 Ed - $* ,l2P! $+ &%72P ., E:48 87%T &# $80 M8 EdF$ . Te
9、st to EDS-T-7126 9 9P9I -C P9I 8)Y ., E:48t 1993 “x 7 87 E:4 -Gl4 .7 %L6 , d3TE:41,h7 8F 1993“x 787 38%L6$ . ., E:48t 1993“x 787 ) 9P9I / -PF%L6$ . Issue / P9I8)Y Publication Date / 38 88 Description (Organization) / 9PP9I76 (:04.2P ) 4 JUL 2011 Apply new Engineering Standard Template. Limited use with no replacement (Corrosion / Metallurgical Material Lab Team) / 4 d3TE:4 64 957 . F9I957 ($4=E:4 68 ) =* (28*4G D4 )
