1、GM DAEWOO Auto & Technology EDSE ngineering,GM DAEWOO Auto & Technology.Standards LEAD-TIN ALLOY COATED STEEL SHEETS, STRIPS AND WELDED PIPES EDS-M-1310 ISSUED DATE: 1994. 06. 17 REVISEDDATE: 2003. 03. 11 VERSION: 2EDS-M-1310 LEAD-TIN ALLOY COATED STEEL SHEETS, STRIPS AND WELDED PIPES PAGE: 1/4 ISSU
2、ED DATE: 1994. 06. 17 REVISED DATE: 2003. 03. 11 VERSION: 2 GM DAEWOO Auto & Technology 1. SCOPE This standard specifies the lead-tin alloy coated steel sheets and strips and welded pipes used by GM DAEWOO Auto & Technology Company(hereinafter referred to as the “GMDAT“). 2. MANUFACTURING METHOD The
3、se shall be manufactured by dipping properly pretreated cold rolled steel sheets with lead-tin alloy or electrolytic plating. 3. TYPE AND USE Table 1. Type and Use Type Use Applications ZP Equal plating Gasoline fuel series required corrosion resistance Fuel tank 4. QUALITY 4.1. Base metal 4.1.1. Th
4、e chemical composition and mechanical properties of the base metal shall conform to the standard for each base metal. Mainly used base metals are as shown in Table 2 and other base metals may be used. Table 2. Types of Base Metals Base metals Standard Cold rolled steel sheets and strip EDS-M-1101 4.
5、1.2. The base metal shall be properly surface-finished for plating and free from impurities and surface defects that may have harmful effect on the plating process or corrosion resistance or appearance after plating. 4.2. Plating layer 4.2.1. Plating layer is composed of lead-tin alloy, and the comp
6、onents of plating layer in accordance with the manufacturing method shall conform to Table 3. Table 3. Components of Plating Layer Unit wt % Manufacturing method Sn Sb Pb Electrolytic plating 5 10 Minute amount Rest Dipping 8 15 3 max. RestEDS-M-1310 LEAD-TIN ALLOY COATED STEEL SHEETS, STRIPS AND WE
7、LDED PIPES PAGE: 2/4 ISSUED DATE: 1994. 06. 17 REVISED DATE: 2003. 03. 11 VERSION: 2 GM DAEWOO Auto & Technology 4.2.2. Plating weight The typical plating weight shall be 37.5/37.5 g/m 2on both sides. The one side plating may be specified. Table 4. Typical Plating Weight and Thickness Minimum platin
8、g weight for each side(g/m 2 ) Type Three points method One point method Thickness of plating(mm) 37.5/37.5 37.5/37.5 30/30 4/4 Equal plating 50/50 50/50 35/35 5.3/5.3 Remarks 1. Plating weight other than these may be designated according to the coding system in item 6. 2. Minute deviation of platin
9、g thickness is allowed as long as it meets the corrosion resistance in item 4.4. 4.2.3. The plating layer shall be free from defects harmful to corrosion resistance or appearance. 4.3. Adhesion The plating layer of the outside surface shall not peel off when tested for adhesion according to item 7.2
10、 There shall be no cracks in the base metal. While roughening of the plating layer is allowed, visually observable folding and crack in the plating layer shall not be allowed. 4.4. Unpainted corrosion resistance 4.4.1. For plate samples of about 200 300mm in size which are cleared of oil with petro
11、leum benzene 40/70 it shall be regulated as follows. Salt Spray Test : EDS-T-7143-24 hours-grade 2 4.4.2. For the formed subpart, it shall regulated as specified in 4.4.1 4.5. Paintability The steel sheets, strips and pipes shall be suitable for phosphating and painting. 4.6. Formability These shall
12、 be preferably applied to parts whose plating layer does not peel off during press forming. 4.7. Weldability These shall be suitable for fusion welding and resistance welding, and special attention shall be paid during welding. 4.8. Surface condition Unless otherwise specified, it shall be coated wi
13、th oil on delivery. 4.9. Quality of welded pipes 4.9.1. The welded joint shall conform to regulations of EDS-T-7127Method of Inspection for the Cross Section ofEDS-M-1310 LEAD-TIN ALLOY COATED STEEL SHEETS, STRIPS AND WELDED PIPES PAGE: 3/4 ISSUED DATE: 1994. 06. 17 REVISED DATE: 2003. 03. 11 VERSIO
14、N: 2 GM DAEWOO Auto & Technology Fusion Welding Connection in Steel 4.9.2. The outside of the pipe shall be finished smoothly and free from welding burr. 5. NOTE Samples of materials or parts that follow this standard shall be approved by Technical Center before mass production & delivery. In the ev
15、ent of any modification form this standard, 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. CODING SYSTEM 6.1. - P / Pl
16、ating weight(outside/inside) ZP : Lead-tin alloy coated steel sheet. TP : Pipe welded with lead-tin alloy coated steel sheet Base metal 6.2. Coding method(For example) - Typical plating layer : SPCC - ZP 37.5/37.5 - Equal plating : SPCEN - ZP 50/50 - Coated steel pipe : SPCC - TP 37.5/37.5 7. TEST 7
17、1. All tests shall be performed at 23 5 . 7.2. Adhesion test Adhesion of plating layer shall be tested by observing and evaluating outside of random-taken test piece of 201 mm in width and about 160mm in length after bending it at an angle of 180with bending radius R=t(thickness of steel sheet). Th
18、e test piece shall be taken at least 50 mm or more inside of the end of steel sheet. 7.3. Test standard EDS-T-7127 Method of Inspection for the Cross Section of Fusion Welding Connection in Steel EDS-T-7136 Method of Plating Thickness Measurement EDS-T-7143 Method of Salt Spray TestEDS-M-1310 LEAD-TIN ALLOY COATED STEEL SHEETS, STRIPS AND WELDED PIPES PAGE: 4/4 ISSUED DATE: 1994. 06. 17 REVISED DATE: 2003. 03. 11 VERSION: 2 GM DAEWOO Auto & Technology 8. AUTOMOTIVE RESTRICTED HAZARDOUS SUBSTANCES Materials and components of parts must comply with EDS-A-0101.
