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Galvanized sheet
Corrosion destroys about 10% of all metal produced in the world; every sixth or seventh blast furnace works in vain: the steel smelted in it completely turns into rust within a year. Even in developed countries with high technology, the damage caused by corrosion can reach 4% of GDP. One of the most effective ways to protect against corrosion is to apply a protective layer of zinc to the surface of metal structures. Galvanizing is several times cheaper than paint and varnish coatings, and, at the same time, extends the service life of the metal by 30-40 years.
Sheet (also rolled) galvanized steel is produced:
- hot galvanizing of thin-sheet cold-rolled steel coils;
- by applying galvanic coating;
- spraying (gas-thermal method);
- thermal diffusion galvanizing.
The most common is hot-dip galvanizing; this technology makes it possible to produce a strong and durable anti-corrosion coating with a thickness of 10 to 60 microns at the lowest cost. Matte white, sometimes with a gray tint without shine, the coating obtained by hot-dip galvanizing is inferior in decorative qualities to shiny and silver galvanized ones, but has greater hardness and excellent strength characteristics.
Galvanized sheet GOST 14918-80 (technical conditions and requirements)
Standard 14918-80 applies to cold-rolled carbon steel 0.5 to 2.5 mm thick that has been continuously hot-dip galvanized (which results in the formation of a corrosion-resistant Zn-Fe alloy on the metal surface). For galvanizing low-carbon steels, technical conditions are determined separately, by standard R 52246-2004.
№ | Classification of galvanized steel GOST 14918-80 | Groups, categories, classes | Abbreviation (used for symbolic designation) |
1 | Assignment Groups | General purpose | HE |
For cold stamping | XSh | ||
For cold profiling | HP | ||
For painting | PC | ||
2 | Hood categories | Very deep draw | VG |
Deep | G | ||
Normal | N | ||
3 | Tread quality | Reduced thickness variation | UR |
Normal thickness variation | HP | ||
4 | Galvanization layer thickness, class | I class | 1 |
II class | 2 | ||
Elevated | P | ||
5 | Appearance of galvanization/type of crystallization pattern (by agreement with the customer) | With crystallization pattern | KR |
Without crystallization pattern | MT |
Material characteristics
Galvanized sheet is produced by rolling steel with the addition of zinc, the latter covering the product on all sides. Due to this, the development of corrosion processes formed during the interaction of iron with oxygen contained in the air is prevented.
On sale you can find material that is coated with zinc on only one side. This is required in order to subsequently send the sheets for further processing, which may include the following:
- Hood;
- Bending;
- cutting;
- Profiling and so on.
On sale you can find several types of galvanized steel sheets - corrugated, smooth, made in the form of corrugated sheets.
During the processing of the product, all its useful technical characteristics are preserved:
- Mechanical strength;
- Flexibility;
- Resistance to corrosion processes;
- Ability to post-process.
To obtain such material, high-quality sheet steel obtained through the cold rolling process is used. Zinc is applied using galvanic technology or hot-dip galvanizing.
The galvanic application method consumes a significantly greater amount of energy compared to hot-dip galvanizing. As a result, it is much more efficient to pass a sheet of steel through molten zinc. The coating can be uniform or patterned. It is worth noting that zinc coating can have different colors and textures. The service life of the material is several decades.
Zinc is applied using galvanic technology or hot-dip galvanizing
Galvanized sheet, dimensions according to GOST 19904-90 (assortment)
Dimensions, maximum deviations and requirements for manufacturing accuracy for galvanized steel are established by the GOCT 19904-90 assortment in the same way as for non-galvanized cold-rolled sheet steel.
Galvanized steel according to specifications in accordance with GOCT 14918-80 is manufactured in widths from 700 to 1800 mm (size increments depending on the range of 50, 100 and 150 mm), lengths from 1000 to 6000 mm (size increments 20, 80, 100, 150, 200, 300, 500 mm), however, by agreement with the consumer, if necessary, other sizes can be installed.
The thickness of the galvanized sheet is regulated in the range from 0.5 to 2.55 mm, and the assortment determines the following dimensional step:
- thickness range 0.5-0.8 mm - step is 0.05 mm;
- range 0.8-1.8 mm - step 0.1 mm;
- range 1.8-2.5 - step 0.2, last - 0.3 mm.
Weight of galvanized sheet
The weight of a galvanized sheet (one square meter) can theoretically be calculated using the formula:
M=M1×t1+M2×t2
(1)
Where:
- M - weight of 1 m² of galvanized sheet, kg;
- M1 - weight of 1 m² of steel sheet without a cladding layer 1 mm thick;
- t1 is the thickness of the steel sheet without coating;
- M2 - weight of 1 m² of zinc cladding layer 1 mm thick;
- t2 is the thickness of the zinc layer on both sides of the sheet.
The specific gravity of carbon steel is 7.85 g/cm³, or, for convenience of calculations, it is generally accepted that 1 m² of sheet steel with a thickness of 1 mm weighs 7.85 kg. The specific gravity of zinc is slightly less - 7.13 g/cm³, that is, 1 m² of zinc with a thickness of 1 mm weighs 7.13 kg. Taking into account these quantities, formula (1) can be rewritten:
M=7.85×t1+7.13×t2
The thickness of the zinc layer depends on the coating class (GOCT 14918-80) and is indicated in the symbol:
Class | Limit values for layer thickness, mm | Weight of tread layer on both sides, kg |
I | From 0.018 to 0.04 Average value 0.029 | 0.258-0.570 Average 0.414 |
II | From 0.01 to 0.018 Average value 0.014 | 0.1425-0.258 Average 0.200 |
P (increased) | From 0.04 to 0.06 | 0.57-0.855 Average 0.712 |
To calculate the weight of a galvanized sheet, you can also use a formula that takes into account the weight of the coating depending on the class of layer thickness:
M=7.85×t1+Mp.s., where:
- M - galvanized sheet weight 1 m², kg
- t1 is the thickness of the steel sheet without coating;
- Mp.s. - the average weight of the tread layer depending on the thickness class, the value is standardized by GOCT 14918-80.
To calculate how much a galvanized sheet weighs (the weight of one sheet of the required size), use the formula:
Msheet=M×S, where:
- Msheet - weight of one galvanized sheet, kg;
- M – weight of 1 m², kg;
- S—sheet area, m².
Considering that the GOST 19904-90 assortment allows deviations from the design weight of up to 3% (due to regulated maximum deviations in thickness, length and width), as well as taking into account the small thickness of the cladding layer and the small difference between the specific gravity of steel and zinc alloy ( which may contain lead and aluminum), the theoretically calculated mass may differ slightly from the actual weight.
№ | Sheet thickness, mm | Weight of 1 m² of steel without zinc coating , kg | Weight of 1 m² of galvanized steel, 1 class of coating thickness , kg | Weight of 1 m² of galvanized steel, class 2 coating thickness , kg | Weight of 1 m² of galvanized steel, coating thickness class P , kg | Number of m² per ton of galvanized steel class 2 |
1 | 0,50 | 3,925 | 4,339 | 4,125 | 4,637 | 242,42 |
2 | 0,55 | 4,317 | 4,731 | 4,517 | 5,029 | 221,36 |
3 | 0,60 | 4,710 | 5,124 | 4,910 | 5,422 | 203,67 |
4 | 0,65 | 5,103 | 5,517 | 5,303 | 5,815 | 188,60 |
5 | 0,70 | 5,495 | 5,909 | 5,695 | 6,207 | 175,59 |
6 | 0,75 | 5,888 | 6,302 | 6,088 | 6,600 | 164,2 |
7 | 0,80 | 6,280 | 6,694 | 6,480 | 6,992 | 154,32 |
8 | 0,90 | 7,065 | 7,479 | 7,265 | 7,777 | 137,65 |
9 | 1,00 | 7,850 | 8,264 | 8,050 | 8,562 | 124,22 |
10 | 1,10 | 8,635 | 9,049 | 8,835 | 9,347 | 114,09 |
11 | 1,20 | 9,420 | 9,834 | 9,620 | 10,132 | 103,95 |
12 | 1,50 | 11,775 | 12,189 | 11,975 | 12,487 | 83,51 |
13 | 2,00 | 15,700 | 16,114 | 15,900 | 16,412 | 62,89 |
14 | 2,50 | 19,625 | 20,039 | 19,825 | 20,337 | 50,45 |
According to GOCT 14918-80, galvanized steel can be manufactured with a differentiated coating: on one side thickness class No. 2, and on the other - No. 1 or P, which is taken into account when calculating weight.
OTs-5 Casting made of galvanized steel, 0.5 mm thick, 50x2000
Painting in RAL colors
carries out the production of metal products painted at your request in any color according to the RAL marking.
Along with painted products, you can purchase from our company roofing screws, screws, and rivets, also painted in RAL color according to your request. To place an order for painting steel products and painting fasteners for installation, send us a request by E-mail or call +7 (495) 230-10-82
Frequently requested RAL colors:
RAL 1014; RAL 1015; RAL 1018; RAL 3003; RAL 3005; RAL 3009; RAL 3011; RAL 3020; RAL 5002; RAL 5005; RAL 5010; RAL 5021; RAL 6002; RAL 6005; RAL 6020; RAL 7004; RAL 7024; RAL 7035; RAL 8004; RAL 8017; RAL 8019; RAL 9003; RAL 9005; RAL 9016
RAL No. | Color | Decoding |
RAL 1014 | Ivory | |
RAL 1015 | Light ivory | |
RAL 1018 | Zinc yellow | |
RAL 3003 | Ruby red | |
RAL 3005 | Wine red | |
RAL 3009 | Oxide red | |
RAL 3011 | Brown red | |
RAL 3020 | traffic red | |
RAL 5002 | Ultramarine blue | |
RAL 5005 | Signal blue | |
RAL 5010 | Gentian blue | |
RAL 5021 | Water blue | |
RAL 6002 | Leaf green | |
RAL 6005 | Moss green | |
RAL 6020 | Chrome green | |
RAL 7004 | Signal gray | |
RAL 7024 | Graphite gray | |
RAL 7035 | Light gray | |
RAL 8004 | Copper brown | |
RAL 8017 | Chocolate brown | |
RAL 8019 | Gray brown | |
RAL 9003 | Signal white | |
RAL 9005 | Jet black | |
RAL 9016 | Traffic white |
Full list of RAL colors:
RAL No. | Color | Decoding |
RAL 1000 | Green beige | |
RAL 1001 | Beige | |
RAL 1002 | Sandy yellow | |
RAL 1003 | Signal yellow | |
RAL 1004 | Golden yellow | |
RAL 1005 | Honey yellow | |
RAL 1006 | Maize yellow | |
RAL 1007 | Daffodil yellow | |
RAL 1011 | Brown beige | |
RAL 1012 | Lemon yellow | |
RAL 1013 | Oyster white | |
RAL 1014 | Ivory | |
RAL 1015 | Light ivory | |
RAL 1016 | Sulfur yellow | |
RAL 1017 | Saffron yellow | |
RAL 1018 | Zinc yellow | |
RAL 1019 | Gray beige | |
RAL 1020 | Olive yellow | |
RAL 1021 | Rape yellow | |
RAL 1023 | traffic yellow | |
RAL 1024 | Ocher yellow | |
RAL 1026 | Luminous yellow | |
RAL 1027 | Curry | |
RAL 1028 | Melon yellow | |
RAL 1032 | Broom yellow | |
RAL 1033 | Dahlia yellow | |
RAL 1034 | Pastel yellow | |
RAL 1035 | Pearl beige | |
RAL 1036 | Pearl gold | |
RAL 1037 | Sun yellow | |
RAL 2000 | Yellow orange | |
RAL 2001 | Red orange | |
RAL 2002 | Vermillion | |
RAL 2003 | Pastel orange | |
RAL 2004 | Pure orange | |
RAL 2005 | Luminous orange | |
RAL 2007 | Luminous bright orange | |
RAL 2008 | Bright red orange | |
RAL 2009 | traffic orange | |
RAL 2010 | Signal orange | |
RAL 2011 | Deep orange | |
RAL 2012 | Salmon orange | |
RAL 2013 | Pearl orange | |
RAL 3000 | Flame red | |
RAL 3001 | Signal red | |
RAL 3002 | Carmine red | |
RAL 3003 | Ruby red | |
RAL 3004 | Purple red | |
RAL 3005 | Wine red | |
RAL 3007 | Black red | |
RAL 3009 | Oxide red | |
RAL 3011 | Brown red | |
RAL 3012 | Beige red | |
RAL 3013 | Tomato red | |
RAL 3014 | Antique pink | |
RAL 3015 | Light pink | |
RAL 3016 | Coral red | |
RAL 3017 | Rose | |
RAL 3018 | Strawberry red | |
RAL 3020 | traffic red | |
RAL 3022 | Salmon pink | |
RAL 3024 | Luminous red | |
RAL 3026 | Luminous bright red | |
RAL 3027 | Raspberry red | |
RAL 3028 | Pure red | |
RAL 3031 | Orient red | |
RAL 3032 | Pearl ruby red | |
RAL 3033 | Pearl pink | |
RAL 4001 | Red lilac | |
RAL 4002 | Red violet | |
RAL 4003 | Heather violet | |
RAL 4004 | Claret violet | |
RAL 4005 | Blue lilac | |
RAL 4006 | Traffic purple | |
RAL 4007 | purple violet | |
RAL 4008 | Signal violet | |
RAL 4009 | Pastel violet | |
RAL 4010 | Telemagenta | |
RAL 4011 | Pearl violet | |
RAL 4012 | Pearl blackberry | |
RAL 5000 | Violet blue | |
RAL 5001 | Green blue | |
RAL 5002 | Ultramarine blue | |
RAL 5003 | Sapphire blue | |
RAL 5004 | Black blue | |
RAL 5005 | Signal blue | |
RAL 5007 | Brilliant blue | |
RAL 5008 | Gray blue | |
RAL 5009 | Azure blue | |
RAL 5010 | Gentian blue | |
RAL 5011 | Steel blue | |
RAL 5012 | Light blue | |
RAL 5013 | Cobalt blue | |
RAL 5014 | Pigeon blue | |
RAL 5015 | sky blue | |
RAL 5017 | Traffic blue | |
RAL 5018 | Turquoise blue | |
RAL 5019 | Capri blue | |
RAL 5020 | Ocean blue | |
RAL 5021 | Water blue | |
RAL 5022 | Night blue | |
RAL 5023 | Distant blue | |
RAL 5024 | Pastel blue | |
RAL 5025 | Pearl Gentian blue | |
RAL 5026 | Pearl night blue | |
RAL 6000 | Patina green | |
RAL 6001 | Emerald green | |
RAL 6002 | Leaf green | |
RAL 6003 | Olive Green | |
RAL 6004 | Blue green | |
RAL 6005 | Moss green | |
RAL 6006 | Gray olive | |
RAL 6007 | Bottle green | |
RAL 6008 | Brown green | |
RAL 6009 | Fir green | |
RAL 6010 | Grass green | |
RAL 6011 | Reseda green | |
RAL 6012 | Black green | |
RAL 6013 | Reed green | |
RAL 6014 | Yellow olive | |
RAL 6015 | Black olive | |
RAL 6016 | Turquoise green | |
RAL 6017 | May green | |
RAL 6018 | Yellow green | |
RAL 6019 | pastel green | |
RAL 6020 | Chrome green | |
RAL 6021 | Pale green | |
RAL 6022 | Brown olive | |
RAL 6024 | Traffic green | |
RAL 6025 | Fern green | |
RAL 6026 | Opal green | |
RAL 6027 | Light green | |
RAL 6028 | Pine green | |
RAL 6029 | Mint green | |
RAL 6032 | Signal green | |
RAL 6033 | Mint turquoise | |
RAL 6034 | Pastel turquoise | |
RAL 6035 | Pearl green | |
RAL 6036 | Pearl opal green | |
RAL 6037 | Pure green | |
RAL 6038 | Luminous green | |
RAL 7000 | Squirrel gray | |
RAL 7001 | Silver gray | |
RAL 7002 | Olive gray | |
RAL 7003 | Moss gray | |
RAL 7004 | Signal gray | |
RAL 7005 | Mouse gray | |
RAL 7006 | Beige gray | |
RAL 7008 | Khaki gray | |
RAL 7009 | Green gray | |
RAL 7010 | Tarpaulin gray | |
RAL 7011 | Iron gray | |
RAL 7012 | Basalt gray | |
RAL 7013 | Brown-grey also NATO-olive, Stone-grey-olive | |
RAL 7015 | Slate gray | |
RAL 7016 | Anthracite gray | |
RAL 7021 | Black gray | |
RAL 7022 | Umbra gray | |
RAL 7023 | Concrete gray | |
RAL 7024 | Graphite gray | |
RAL 7026 | Granite gray | |
RAL 7030 | Stone gray | |
RAL 7031 | Blue gray | |
RAL 7032 | Pebble gray | |
RAL 7033 | Cement gray | |
RAL 7034 | Yellow gray | |
RAL 7035 | Light gray | |
RAL 7036 | Platinum gray | |
RAL 7037 | Dusty gray | |
RAL 7038 | Agate gray | |
RAL 7039 | Quartz gray | |
RAL 7040 | Window gray | |
RAL 7042 | Traffic gray A | |
RAL 7043 | Traffic gray B | |
RAL 7044 | Silk gray | |
RAL 7045 | Telegrey 1 | |
RAL 7046 | Telegrey 2 | |
RAL 7047 | Telegrey 4 | |
RAL 7048 | Pearl mouse gray | |
RAL 8000 | Green brown | |
RAL 8001 | Ocher brown | |
RAL 8002 | Signal brown | |
RAL 8003 | Clay brown | |
RAL 8004 | Copper brown | |
RAL 8007 | Fawn brown | |
RAL 8008 | Olive brown | |
RAL 8011 | Nut brown | |
RAL 8012 | Red brown | |
RAL 8014 | Sepia brown | |
RAL 8015 | Chestnut brown | |
RAL 8016 | Mahogany brown | |
RAL 8017 | Chocolate brown | |
RAL 8019 | Gray brown | |
RAL 8022 | Black brown | |
RAL 8023 | Orange brown | |
RAL 8024 | Beige brown | |
RAL 8025 | Pale brown | |
RAL 8028 | Terra brown | |
RAL 8029 | Pearl copper | |
RAL 9001 | Cream | |
RAL 9002 | Gray white | |
RAL 9003 | Signal white | |
RAL 9004 | Signal black | |
RAL 9005 | Jet black | |
RAL 9006 | White aluminum | |
RAL 9007 | Gray aluminum | |
RAL 9010 | Pure white | |
RAL 9011 | Graphite black | |
RAL 9016 | Traffic white | |
RAL 9017 | Traffic black | |
RAL 9018 | Papyrus white | |
RAL 9022 | Pearl light gray | |
RAL 9023 | Pearl dark gray |