DX51D + Z275 EN 10346/10143 Regular Spangle Chromate Skin Pass Galvanized Steel Sheet Coil 1.5*1250MM
G90 Galvanized Steel
G90 galvanized steel is a durable galvanized steel product. “G+number” is used to describe the zinc coating thickness of galvanized steel according to ASTM Standards (ASTM-A525 or ASTM-A653/A653M). The “G” here refers to galvanizing, and the number refers to the weight of zinc on the surface of the steel sheet, such as G30, G60, G90, and G185. The higher the number, the thicker the zinc coating. For example, G90 galvanized steel has a zinc coating weight of 0.9 ounces per square foot. While G60 means the dual-sided coating weight is 0.6 oz/ft2.
Z275 Galvanized Steel
According to the EN 10346 standard, Z+number is used to specify the zinc coating thickness of hot-dip galvanized products. Z here means zinc, and the number refers to the zinc coating weight. For example, Z275 means the weight of zinc on both sides of the steel surface is 275 grams per square meter. While Z140 or Z14 is often used to describe the zinc coating weight of 140 g/m2. Also, the higher the number, the thicker the zinc coating.
There are some commonly used codes, such as DX51D+Z275. You may find the codes on the package of steel coils or sheets.
DX51D+Z275 is a designation for hot-dipped galvanized steel according to European standards. The first letter “D” means flat steel for cold forming, and “X” here means that the rolling state of the substrate is not specified. If the letter is C, it means that the substrate is specified as a cold-rolled substrate; if the letter is D, the substrate is specified as a hot-rolled substrate. The number (51, 52, 53, 54, etc) indicates the serial number of the steel grade, and “51” is for general uses. The “D” after the number means hot-dip galvanizing. Z275 refers to the zinc coating thickness of 275 g/m2. Except for zinc coating, you may find galvalume coating (AZ), ZAM coating, etc.
G90 VS Z275 Galvanized Steel
Let’s convert them to the same units. 1 ounce/sq ft is about 305.15 g/m2. Then 0.9 ounces/sq ft is about 275 g/m2. Therefore, G90 and Z275 actually describe the same zinc coating thickness of galvanized steel. “G+number” is commonly used in the USA and provides a basic level of corrosion protection for steel. While “Z+number” is commonly used in Europe and other countries.
Some customers would like to use the unit of microns (μm) to calculate the thickness of the zinc layer. The density of zinc is 7.14 grams/cm3. In terms of the Z275 galvanized sheet, 275/7.14=38.5154 cm3=38515.4 mm3, that is, the average thickness per square meter is 38.5154 μm (total both sides). Below is a table for your reference.
| EN 10346 Standard | ASTM Standard | Ounce/sq ft (both sides) | Gram /m2 (both sides) | Microns (one side) | Mils (one side) |
| Z90 | G30 | 0.3 | 90 | 6 | 0.25 |
| Z120 | G40 | 0.4 | 120 | 9 | 0.34 |
| Z180 | G60 | 0.6 | 180 | 13 | 0.51 |
| Z275 | G90 | 0.9 | 275 | 19 | 0.76 |
| Z350 | G115 | 1.15 | 350 | 25 | 0.97 |
G90 vs G60
Galvanization refers to the process of applying a protective zinc coating to steel or iron to prevent rusting. The letters “G” followed by a number (like G60 or G90) indicate the thickness of the zinc coating. G90 is with a zinc coating weight of 0.9 ounces per square foot. While G60 has a zinc coating weight of 0.6 ounces per square foot. Generally, the thicker the zinc coating, the better the corrosion resistance, and durability. Obviously, G90 galvanized steel provides a thicker and more durable zinc coating compared to G60 galvanized steel, making it more durable and long-lasting.
Uses of G90 Galvanized Steel
G90 galvanized steel is actually a kind of high-zinc coated steel. It is commonly used in a variety of applications due to its excellent corrosion resistance, for example,
1. Roofing and siding;
2. Structural components, such as beams, columns, and purlins.
3. Outdoor and indoor storage, such as storage tanks, silos, and sheds.
4. Agricultural equipment, such as feed bins, barns, and poultry houses.
5. Automotive and transportation industries for parts and components that require a high level of corrosion resistance.
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DX51D + Z275 EN 10346/10143 Regular Spangle Chromate Skin Pass Galvanized Steel Sheet Coil 1.5*1250MM Images
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