1、GM DAEWOO Auto & Technology EDSE ngineering,GM DAEWOO Auto & Technology.Standards FERRITIC DUCTILE IRON CASTINGS FOR STEERING KNUCKLE EDS-M-1908 ISSUED DATE: 1994. 07. 12 REVISEDDATE: 2003. 02. 28 VERSION: 3EDS-M-1908 FERRITIC DUCTILE IRON CASTINGS FOR STEERING KNUCKLE PAGE: 1/4 ISSUED DATE: 1994. 0
2、7. 12 REVISED DATE: 2003. 02. 28 VERSION: 3 GM DAEWOO Auto & Technology 1. SCOPE This standard specifies ferritic ductile Iron castings for steering knuckle used by GM DAEWOO Auto & Technology Company(hereinafter referred to as the “GMDAT“). 2. MANUFACTURING METHOD 2.1. The iron castings shall be ma
3、nufactured by melting in a cupola, electric furnace and other suitable furnace and carrying out treatment to spheroidize graphite in ladle. 2.2. The iron castings may be subjected to annealing and other heat treatment to improve elongation and impact value. 3. TYPE AND USE Table 1. Type and Use Type
4、 Use Applications FCD 400S Iron castings requiring high toughness Steering knuckle 4. QUALITY 4.1. Chemical composition 4.1.1. Main compositionTable 2. Main Chemical Composition Unit : wt% C Si Mn P S Cr Cu Mg 3.4 3.7 2.1 2.3 0.3 0.6 0.05 max. 0.02 max. 0.05 max. 0.20 max. 0.04 min. 4.1.2. Permissib
5、le accompanying or trace elements : 0.2 max. of total contents. Pb : 0.002 max. Se : 0.03 max. Sb : 0.002 max. As : 0.02 max. Bi : 0.001 max. Ti : 0.05 max. B : 0.005 max. Al : 0.02 max. Te : 0.01 max. Cd : 0.005 max. 4.2. Mechanical properties Table 3. Mechanical Properties Type Tensile strength (N
6、/ ) Yield strengrh (N/ ) Elongation note 1) (%) Impact value note 2) (J/ ) Hardness (HB) FCD 400S 400 min. 270 min. 18 min. 70 min. 135 170 Remark : 1. Elongation are the value after fracture from the test piece with gauge length of L o =5D o (Diameter of parallel portion)2. Impact strength are the
7、values resulting from the tests performed with unnotched test piece of 6 6 40mm at-30 2 .EDS-M-1908 FERRITIC DUCTILE IRON CASTINGS FOR STEERING KNUCKLE PAGE: 2/4 ISSUED DATE: 1994. 07. 12 REVISED DATE: 2003. 02. 28 VERSION: 3 GM DAEWOO Auto & Technology 4.3. Microstructure Microstructures of iron ca
8、stings shall be evaluated according to EDS-T-7101 Method of Microscopic Test for the Microstructures in cast Iron by the structure rating chart. 4.3.1. Graphite spheroidizing rate : 90% min. Chart figure 1 4.3.2. Graphite size : chart figure 6 8 4.3.3. Base structure : Base structure shall be free f
9、rom chill structure and shall be made up of 90% min of Ferrite. Chart IX figure 6. 4.4. Appearance 4.4.1. Dimensions of castings shall satisfy the specification in the drawing. 4.4.2. The surface of castings shall be free from molding and core sand and such defects as crack, intrusion of casting san
10、d and slag, blowhole, shrinkage hole that may cause harm during, machining and use. 4.5. Process control of manufacturer 4.5.1. Chemical composition Chemical composition analysis of pouring for every distribution shall be performed to guarantee the quality of casting process and its record shall be
11、kept. When required by the purchaser, record shall be submitted. 4.5.2. Hardness : 100% test in blanks before machining 4.5.3. Graphite spheroidizing rate : 100% test by ultrasonic inspection device. 4.5.4. Internal defects(Macro porosity Slag etc) : 100% X-ray test or X-ray and ultrasonic inspectio
12、n test. 4.5.5. Surface crack : Random test by statistic process control. 4.5.6. Visual check : 100% inspection 5. NOTE Samples of materials or parts that follow this standard shall be approved by Technical Center before mass production & delivery. In the event of any modification form this standard,
13、 it is the sole responsibility of the supplier to inform the purchaser of all such modifications. Furthermore, the supplier shall submit the modified sample for reapproval by Technical Center before mass production & delivery. 6. TEST 6.1. All tests shall be performed at 23 5 .EDS-M-1908 FERRITIC DU
14、CTILE IRON CASTINGS FOR STEERING KNUCKLE PAGE: 3/4 ISSUED DATE: 1994. 07. 12 REVISED DATE: 2003. 02. 28 VERSION: 3 GM DAEWOO Auto & Technology 6.2. Specimen 6.2.1. The specimen shall generally be cast separately under the same conditions as the iron castings by using the mould of the same type with
15、the iron castings. Sampling cycle and numbers of test specimen shall be as agreed between the delivery parties concerned. Specimen shall be heat-treated along with the products in the same furnace and time with those of products. 6.2.2. Shape and dimension of test specimen Shape and dimensions of sp
16、ecimens shall be of 6 types made up of four Y types(No. A D indicated in Table 5 and Fig. 1) and 6 knock off types shown in Fig. 2(type Ka or Kb). In principle, No. B of type Y shall be used, but knock off type(type Ka or Kb) may be substituted for No. B. When there are remarkable differences in the
17、 thickness of Iron castings, one of No. A, C and D of type Y may be used, and the type of specimen shall be recorded in the test report.Fig. 1 Y type specimen Fig. 2 Mould, shape and Dimensions of knock-off type (type and type Kb specimens) Table 4. Y type dimension of sprcimen Unit : mm Type a b c
18、d e No.A 12 40 25 135 150 min No.B 25 55 40 140 150 min No.C 50 90 50 160 150 min No.D 75 125 65 175 150 minEDS-M-1908 FERRITIC DUCTILE IRON CASTINGS FOR STEERING KNUCKLE PAGE: 4/4 ISSUED DATE: 1994. 07. 12 REVISED DATE: 2003. 02. 28 VERSION: 3 GM DAEWOO Auto & Technology 6.3. Test standard EDS-T-71
19、01 Method of Microscopic Test for the Microstructures in Cast Iron by the Structure Rating Chart EDS-T-7113 Method of Tensile Test for Metallic Materials EDS-T-7115 Method of Impact Test for Metallic Materials EDS-T-7118 Method of Brinell Hardness Test EDS-T-7144 Method of Test Piece Preparation for
20、 Chemical Component Analysis KS B 0801 Tensile Test Piece of Metallic Materials - No. 4, Test Piece KS B 0809 Impact Test Piece of Metallic Materials - No. 3 Unnotched Piece or the one indicated drawing. 7. CROSS INDEX (REFERENCE) Table 4. Cross index EDS-M-1908 GM FCD 400S QF 030001 8. AUTOMOTIVE RESTRICTED HAZARDOUS SUBSTANCES Materials and components of parts must comply with EDS-A-0101.
