JIS G3322
JIS G3322 is Japanese Industrial Standard specifies the prepainted hot-dip 55% aluminium”zinc alloycoated steel sheet and strip .Hot dipped galvalume/aluzinc steel coil have better corrosion resistance, heat resistance, and heat reflection properties, compared to traditional galvanized steel products. GL galvalume steel coil are widely used in industries such as home appliances, construction, structures, and electrical appliances.
JIS G3322 Equivalent
Chinese standard: GBT 12754
European standard: EN10169
American standard: ASTM A755M
What is Aluzinc, Zincalume and Galvalume?
Aluzinc, Zincalume and Galvalume are different trade names of one product. Aluzinc is cold rolled galvalume steel with metal coating composed of Aluminium (55%), Zinc (43.5%) and Slicium (1.5%).
JIS G3322 Specification
The durability of paint coatings of JIS G 3322
shall be classified into three classes, and their grade shall be as given below:
| Grade | Nominal Thickness | Application | Substrate Grade |
| CGLCC | 0.25 ~ 2.3 | Commercial | SGLCC |
| CGLCD | 0.40 ~ 1.6 | Drawing | SGLCD |
| CGLCDD | Deep Drawing | SGLCDD | |
| CGC400 | 0.25 ~ 1.6 | Structural | SGLC400 |
| CGC440 | SGLC440 | ||
| CGC490 | SGLC490 | ||
| CGC570 | SGLC570 |
JIS G3322 Paint coating durability
The durability of paint coating of the sheets and coils shall be in accordance with thefollowing. However, the durability evaluated by the cycle corrosion testing is applied bythe agreement between the purchaser and the supplier.
Salt spray test The salt spray test shall be as follows:
A test piece shall be 50 mm or more in width and 100 mm or more in length.
The testing method shall comply with JlS K 5600.
Dew-cycle type accelerated weathering test The dew-cycle type accelerated weathering test shall be as follows:
A test piece shall be 50 mm or more in width and 100 mm or more in length.
The testing method shall comply with the dew-cycle type weathering tests specified in (Weathering test) of JIS Z 1522.
| Durability Test | ||
| Classification of Durability | Duration of salt spray test | Duration of dew-cycle type accelerated weathering test |
| Class 1 | 200H | Not Applied |
| Class 2 | 500H | Not Applied |
| Class 3 | 2000H | 1500h |
Remarks
For the sheets and coils for roofing for which the quality is guaranteed forone side only, the duration of the salt spray test for the reverse side shall be 150 h.
JIS G3322 Physical properties of paint coatings
JIS G3322 Physical properties
| Item | Structural(CGLC570) | Commercial, (CGLCC) Drawing, (CGLCD, CGLCDD) Structural(CGLC400,CGLC440，CGLC490) |
Physical properties |
| Bneding adhesion | – | 0 | No peeling on the outer sur-face of the bent portion notless than 7mm from eachside edge of the test piece |
| Paint film hradness | 0 | 0 | No scratch marks on thepaint film |
| Impact resistance | – | 0 | No peeling |
| Adhesion | 0 | – | No irregularities on thetested portion |
Remarks:
Bending adhesion shall be applied for the sheet and coil using a non-alloyed type substrate for prepainting. It shall be regarded as a reference test for sheets and coils using an alloyed type substrate for prepainting.
Thickness Tolerances of JIS G 3322
Tolerances on product thickness of Substrate Grade
| Thickness | Width | ||
| Uder 630MM | 630-1000MM | 1000-1250MM | |
| under 0.25 | ±0.08/0.04 | ±0.08/0.04 | ±0.08/0.04 |
| 0.25-0.40 | ±0.09/0.05 | ±0.09/0.05 | ±0.09/0.05 |
| 0.40-0.60 | ±0.10/0.06 | ±0.10/0.06 | ±0.10/0.06 |
| 0.60-0.80 | ±0.11/0.07 | ±0.11/0.07 | ±0.11/0.07 |
| 0.80-1.0 | ±0.11/0.07 | ±0.11/0.07 | ±0.11/0.08 |
| 1.0-1.25 | ±0.12/0.08 | ±0.12/0.08 | ±0.13/0.09 |
| 1.25-1.60 | ±0.13/0.09 | ±0.14/0.10 | ±0.15/0.11 |
| 1.60-2.00 | ±0.15/0.11 | ±0.16/0.12 | ±0.17/0.13 |
| 2.00-2.30 | ±0.17/0.13 | ±0.18/0.14 | ±0.19/0.15 |
Tolerances on product thickness of Prepainted
| Thickness | Width | ||
| Uder 630MM | 630-1000MM | 1000-1250MM | |
| under 0.25 | ±0.10/0.02 | ±0.10/0.02 | ±0.10/0.02 |
| 0.25-0.40 | ±0.11/0.03 | ±0.11/0.03 | ±0.11/0.03 |
| 0.40-0.60 | ±0.12/0.04 | ±0.12/0.04 | ±0.12/0.04 |
| 0.60-0.80 | ±0.13/0.05 | ±0.13/0.05 | ±0.13/0.05 |
| 0.80-1.0 | ±0.13/0.05 | ±0.13/0.05 | ±0.14/0.06 |
| 1.0-1.25 | ±0.14/0.06 | ±0.14/0.06 | ±0.15/0.07 |
| 1.25-1.60 | ±0.15/0.07 | ±0.16/0.08 | ±0.17/0.09 |
| 1.60-2.00 | ±0.17/0.09 | ±0.18/0.10 | ±0.19/0.11 |
| 2.00-2.30 | ±0.19/0.11 | ±0.20/0.12 | ±0.21/0.13 |
Width and Length Tolerances
Width Tolerance: 7MM
Length Tolerance: 15MM
Test of JIS G3322
Sampling of test specimens
For use in the bend, pencil hardness, impact and cross-scoring tests, one test specimen shall be sampled from every 50 t or fraction of products of the same class of substrate for prepainting, the same coating mass and the same dimensions and colour.
For corrugated sheets, test specimens shall be taken from flat sheets prior to corrugation.
Bent Test of JIS G3322
The bend test shall be as follows:
1. The test piece shall have a width of 75 mm to 125 mm and a length suited for the test. Unless otherwise specified, one test piece shall be cut out of each test specimen paralleled to the rolling direction of the substrate for prepainting.
2. By referring to the internal spacing of bend the test piece shall be bent manually with a vise as the test side is adjusted to the outside 180-degree longitudinal direction of the test piece, as shown in Below picture. When a hand vise is not available, other suitable means of testing may be adopted.
| Grade | Bend Angle | Thickness | Internal Spacing of Bend |
| CGLCC | 180 Degree | 0.4 or under | 2 Sheet of Thickness |
| Over 0.4 up to 2.3MM | 3 Sheet of Thickness | ||
| CGLCD | 180 Degree | Over 0.4 up to 1.6MM | 2 Sheet of Thickness |
| CGLCDD | Over 0.4 up to 1.6MM | 2 Sheet of Thickness | |
| CGC400 | 180 Degree | 1.6MM or Under | 3 Sheet of Thickness |
| CGC440 | 180 Degree | 0.4MM or Under | 4 Sheet of Thickness |
| CGC490 | 180 Degree | Over 0.4 up to 1.6MM | 5 Sheet of Thickness |
| CGC570 | - | - | - |
Pencil hardness test of JIS G3322
The pencil hardness test shall be as follows:
1. A pencil equal or superior to ordinary grade as specified in JIS S 6006 and having the hardness given in the below Table shall be used. For commercial and drawing qualities, pencil hardness symbols other than those given above may be used as agreed upon between the purchaser and manufacturer.
Pencil Hardness
| Durability | Hardness |
| Class 1 | H |
| Class 2 | H |
| Class 3 | F |
2. The pencil shall be sharpened so as to expose about 3 mm of lead. While being held at right angles to an abrasive paper of No. 400 or finer which has been laid on a hard, flat surface, the point of the lead shall be made to draw a continuous circle gently and thus be ground down so as to obtain a flat surface with sharp edges at the tip.
The tip of the lead shall be ground flat before reuse for each test.
3. Holding the prepared pencil at about 45 degrees to the surface of the tests specimen, straight lines shall be drawn with it in the direction shown in below pictures with the load being applied of about 10 N. The lines shall be not less than 20mm in length and not less than three in number.
Impact test of JIS G3322
The impact test shall be as follows:
1. A weight shall be dropped onto a test face from a Du Pont-type impact tester, as shown below pictures.
2. The mass of the weight shall be 500 ± 1 g, and the radius of the impact point shall be 6.35+0.03 mm.
3. The weight shall be dropped from a height of 500 mm above the test piece.
Caution for testing of JIS G3322
The tests require the following cautions:
1. Since the durability and physical properties of the sheet and coil are affected by environmental conditions and by paint coating flaws incurred in handling, haircracks on processed surfaces, etc., testing shall be conducted on flat sheets with normal surfaces.
2. The temperature for tests on physical properties shall be the normal temperatures(5°C to 35°C)specified in JlS Z 8703.
This article introduces the technical parameters of JIS G3322 production standards. It is hoped that the introduction of this article will help to better understand the knowledge of color-coated coil products. When you need color-coated coil products, I suggest you prioritize and consider Witop Steel. Witop Steel is a steel manufacturer specializing in the production of galvanized, galvalume, color-coated coils and color steel tiles. If you need to find other steel suppliers, you are welcome to contact us and we will be happy to provide you with professional help.
