◆ 일본공업규격 ( JIS Specification ) <<  이전화면 

Prepainted Hot-Dip Zinc-Coated Steel Sheet and Coil (Jis G 3312)
1.  Classification and Designation
Sheets and coils shall be classified as given in table 1 and 2 according to corrosion resistance and applications.
TABLE 1 Classification by Corrosion Resistance
ClassCodeCorrosion Resistance
11As specified in Table 4, mainly of one-coat
22As specified in Table 4, mainly of two-coat
33As specified in Table 4, mainly of three-coat
TABLE 2 Classification by Application
DesignationApplicable Nominal
Thickness (mm)
ApplicationDesignation of
Base Metal
CGCCOver 0.25 to 1.6 inchCommercialSGCC
CGCHOver 0.11 to 1.0 inch Commercial for
Hardness Drawing
SGCH
CGCD 1Over 0.40 to 1.6 inchSGCD 1
CGC 340Over 0.25 to 1.6 inch StructualSGC 340
CGC 400Over 0.25 to 1.6 inchSGC 400
CGC 440Over 0.25 to 1.6 inchSGC 440
CGC 490Over 0.25 to 1.6 inchSGC 490
CGC 570Over 0.25 to 1.6 inchSGC 570
TABLE 3 Classification by Surface Protection
Surface protectionSymbol
Protective filmP
WaxT
 
2. Corrosion Resistance of Paint Coating
TABLE 4 Test of Corrosion Resistance
ClassSalt Spray TestWeathering Test (Dew Cycle)
1200 hours-
2500 hours-
32000 hours1500 hours
Note :   1. Salt spray test for the reverse side of roofing quality shall be 150 hours.
2. In case of class 3, coating designation of base metal should be over Z 27.
 
3. Physical Requirements
ItemsCommercial for
Hardness (CGCH)
structual(cgc570)
Commercial (CGCC)
Structual
Drawing (CGCD)
(CGC 340,400,
440,490)
Physical
Requirements
Bending test-o No peeling off within
7mm from both edges
Pencil hardnessooNo scratch
Impact test-oNo peeling off
Cross cutting Testo-No adhesion loss
 
4. Standard Dimensions of Cut Lengths and Coils
TABLE 5 Standard Thickness
0.250.270.300.350.400.50 0.600.801.001.201.401.60
TABLE 6 Standard Widths and Lengths
Width(mm)Length(mm)
762
1829213424382743304833533658
914
1829213424382743304833533658
1000
2000      
1219
243830483658    
TABLE 7-1 Thickness Tolerances (Class 1,2 of one side, Class 1 of both sides)
  Specified Width(mm)
Specified Thickness(mm)  
Under 630630 to 1000 excl1000 to 1250 excl
Under 0.25+0.08
-0.03
+0.08
-0.03
+0.08
-0.03
0.25 to 0.40 excl+0.09
-0.04
+0.09
-0.04
+0.09
-0.04
0.40 to 0.60 excl+0.10
-0.05
+0.10
-0.05
+0.10
-0.05
0.60 to 0.80 excl+0.11
-0.06
+0.11
-0.06
+0.11
-0.06
0.80 to 1.00 excl+0.12
-0.07
+0.12
-0.07
+0.13
-0.08
1.00 to 1.25 excl+0.13
-0.08
+0.13
-0.08
+0.14
-0.09
1.25 to 1.60 excl+0.14
-0.09
+0.15
-0.10
+0.16
-0.11
1.60+0.15
-0.10
+0.16
-0.11
+0.17
-0.12
TABLE 7-2 Thickness Tolerances (Class 3 of one side Class 2,3 of both sides)
  Specified Width(mm)
Specified Thickness(mm)  
Under 630630 to 1000 excl1000 to 1250 excl
Under 0.25+0.10
-0.02
+0.10
-0.02
+0.10
-0.02
0.25 to 0.40 excl+0.11
-0.03
+0.11
-0.03
+0.11
-0.03
0.40 to 0.60 excl+0.12
-0.04
+0.12
-0.04
+0.12
-0.04
0.60 to 0.80 excl+0.13
-0.05
+0.13
-0.05
+0.13
-0.05
0.80 to 1.00 excl+0.14
-0.06
+0.14
-0.06
+0.15
-0.07
1.00 to 1.25 excl+0.15
-0.07
+0.15
-0.07
+0.16
-0.08
1.25 to 1.60 excl+0.16
-0.08
+0.17
-0.09
+0.18
-0.10
1.60+0.17
-0.09
+0.18
-0.10
+0.19
-0.11
TABLE 8 Weight of Zinc Coating and Equivalent Thickness
Symbol indication weight of coatingZ 06Z 08 Z 10Z 12Z 18Z 20
Equivalent thickness of coating0.0130.017 0.0210.0260.0340.040

Symbol indication weight of coatingZ 22Z 25 Z 27Z 35Z 45Z 60
Equivalent thickness of coating0.0430.049 0.0540.0640.0800.102

Symbol indication weight of coatingF 04F 06 F 08F 10F 12F 18
Equivalent thickness of coating0.0080.013 0.0170.0210.0260.034
TABLE 9 Tolerances of Width and Length
ItemsToleranceItemsTolerance
Width+7, -0Length+15, 0
 
5.  Weight Tolerances
Weight tolerance are obtained by dividing the difference between the calculated weight and the actual weight by the calculated weight, and are expressed as percentages.
Calculated Weight of One LotTolerance, %Remarks
Under 600kg (1,300 lb)±10 One lot consists of sheets of the same quality, same style and size, and same coating weight.
600kg to 2 tons (4,409 lb) excl±7.5.
2 tons and over±5
  Weights for galvanized sheets are applicable to prepainted galvanized sheets


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