GMKOREA EDS-M-3304-2005 NICO-BF PROCESS (VERSION 3).pdf
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1、GM DAEWOO Auto & Technology EDS Engineering, GM DAEWOO Auto & Technology. Standards NICO-BF PROCESS EDS-M-3304 ISSUED DATE: 2001. 08. 06 REVISED DATE: 2005. 01. 28 VERSION: 3 EDS-M-3304NICO-BF PROCESS PAGE: 1/5 ISSUED DATE: 2001. 08. 06 REVISED DATE: 2005. 01. 28 VERSION: 3 GM DAEWOO Auto & Technolo
2、gy 1. SCOPE This standard shall be applied when some parts (among all parts used by GM DAEWOO Auto & Technology Inc.) go through Oxinitrocarburising process (NICO-BF process), with a view to enhancing surface hardening and corrosion-resistance. 2. METHOD TO MARK HEAT TREATMENT ON THE DRAWING Gas Oxi
3、nitrobarburising process (NICO-BF process) 3. Term 3.1. Oxidation Film: This refers to the Oxidation film of Fe3O4 formed on the outermost surface of the compound in case of NICO-BF process. 3.2. Compound Layer: This refers to the nitrogen layer formed on the surface of a product. It is seen white t
4、hrough the microscope after getting Etching treatment. 3.3. Diffusion Layer: This refers to the nitrogen diffusion layer existing between the surface of a product and the base metal in case of NICO-BF process. Picture 1. NICO-BF Sectioned Drawing (10 30 W )EDS-M-3304NICO-BF PROCESS PAGE: 2/5 ISSUED
5、DATE: 2001. 08. 06 REVISED DATE: 2005. 01. 28 VERSION: 3 GM DAEWOO Auto & Technology 4. QUALITY When it comes to requirements on the hardening layer, standards of Table 1 shall be met. (Note: requirements can be modified according to the agreements between a user and a producer-who shall consider ch
6、aracteristics of each part). Table 1 Standard Code Hardness of a compound layer Depth of a compound layer Depth of a diffusion layer Oxidation Film -Cold Rolled Steel SPCC More than Hv400 More than 10W More than 0.3mm - Carbon Steel: less than 0.3wt%C - Hot Rolled Steel SPHC SAPH SS S10CS28C SUM Mor
7、e than Hv550 More than 10W More than 0.3mm -Carbon Steel: more than 0.3wt%C -Alloy Steel SCM SNCM SK More than S30C More than Hv600 More than 15W More than 0.3mm -Heat Resistance Steel SUH More than Hv800 More than 5WMore than 0.3mm 12W Metal Oxide Layer (Fe3O4) 5. CORROSION RESISTANCE TEST 5.1. NIC
8、O-BF process shall be applied to all parts requiring corrosion resistance. 5.2. Table 2 is the regulations on corrosion resistance. Table 2. Grade Requirements A Grade Red rust shall not exist for 152hours 1)C Grade The regulations of the drawing shall be reflected note 1)In case the rust-preventati
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