Galvanized sheet steel, polymer coated, HK, GK

Structure of steel sheet with polymer coating

Applying polymer coatings to galvanized steel is a complex process, since a steel sheet with a polymer coating has a multilayer structure: a steel sheet, a zinc layer, a passivation layer, a layer of soil, on the front side there is a layer of colored polymer, and on the bottom side of the sheet there is a “multilayer pie” Complete with protective paint.

The basis for production is rolled steel with a thickness of 0.4-2.0 mm. A layer of zinc (or aluminum-zinc) can be applied to it either by galvanic method or by immersion in the melt. Sometimes a polymer coating is applied directly to ferrous metal (however, such metal sheets are very short-lived). Then the metal is passivated, primed and covered with a protective layer of various polymers.

Description

Galvanized roll with polymer coating is produced from galvanized rolled metal using the cold or hot method.
For production, the GOST 52146-2003 standard is used, which regulates the production of sheet products with a polymer protective layer. offers to buy galvanized rolls with polymer coating at a competitive price with delivery from the warehouse. This is a high-quality material, presented in a large assortment and having a decorative and protective color coating according to the RAL catalog.

Methods of applying polymer coating

Polymer coating is obtained by various methods:

• by applying a pre-made film to the strip,
• immersing the strip in the polymer melt,
• roller method of applying liquid polymer (Coil Coating),
• spraying polymer in powder form using the electrostatic method.

The coating can be either one-sided or two-sided. Rolled products with one-sided polymer coating are rolled products with a two-layer polymer coating on the front side and a single-layer polymer coating on the back side.

Two-layer polymer coating – a coating consisting of a layer of primer and a layer of finishing polymer.

A single-layer coating is, as a rule, a coating on the back side of rolled products, consisting of a layer of protective enamel without regulatory requirements for appearance, thickness, corrosion resistance, etc.

Application of a polymer coating is the final stage of rolled metal production. At the customer's request, a protective film of polyethylene can be applied.

Thus, most often polymer-coated steel has the following structure.

1 - steel sheet

2 - zinc layer

3 — passivating layer (anti-corrosion layer)

4 - layer of soil

5 - polymer coating

6 - protective paint on the back side

The primer layer is designed to provide strong adhesion and high corrosion resistance of the entire system, i.e. The quality of the primer determines how firmly the polymer coating will adhere.

Features and Specifications

Polymer-coated steel coils are produced from various grades of steel, usually 08PS, 08Yu, 08KP, 1PS, 2PS, 3PS and others. Product Specifications:

• metal thickness: 0.2-1.2 mm for cold-rolled sheets, 0.4-1.2 mm for hot-rolled;
• width: 700-1650 mm with a weight of 3-15 tons for one roll;
• the internal diameter of the roll is 500-600 mm;
• zinc coating – 100-275 g/sq.m.;
• coating – glossy or matte polymer, the thickness of the polymer coating depends on its type;
• edge – unedged or trimmed;
• color – according to RAL card;
• type of coating – single-, double-sided, multi-layer, single-layer.

The grease base of the roll fully complies with the established standards: EN 10130 (when using steel grades DC04, DC03, DC01), TU 14-101-496 (with different stretchability), GOST 9045, 16523 (determines the strength group). Production complies with GOSTs 16523-97, 9045-93, 19904-90. A polymer-coated roll is a blank for further processing, production of corrugated sheets, stamping, and roofing materials.

For production, hot-rolled or cold-rolled methods are used, galvanizing is only hot (corresponds to GOST 14918-80). The thickness of the zinc coating is 100-140 g/sq.m. and more.

Polymer-coated steel sheets are highly resistant to corrosion, ultraviolet rays, temperature changes, chemicals or physical influences. The polymer can withstand mechanical stress, it is resistant to fading, the coating itself can be smooth, embossed, matte, or with a glossy sheen.

Types of polymer coatings for steel sheets

The following are used as polymer coatings:

• polyester (polyester), designated PE. SP;
• food laminate;
• matte polyester, modified with Teflon, PEMA;
• pural - polyurethane modified with polyamide, PURAL;
• polyvinyl chloride plastisol, PVS;
• polyvinylidene fluoride, PVDF, consists of 80% polyvinyl chloride and 20% acrylic;
• acrylic, AY.

Polyester is the most popular coating due to its optimal price-quality ratio and has satisfactory resistance to UV radiation and corrosion. However, resistance to mechanical damage is higher for Pural and PVDF coatings.

Pural is more expensive than polyester, but it also has higher chemical resistance, as well as to mechanical stress and temperature changes.

The most resistant to mechanical damage due to its thickness, but at the same time the least resistant to temperature changes and UV radiation is plastisol .

The most durable and most expensive coating is polyvinylidene fluoride (PVDF) .

The least durable and unstable to mechanical and atmospheric influences is acrylic coating.

All these coatings can have different texture, shine, and colors. Thus, polymer coatings have different resistance to ultraviolet radiation, high and low temperatures, atmospheric influences, mechanical damage and others.

The above coatings are initially liquid and are applied using the roller method, which is the most common and in demand both in Russia and in other countries.

The most important requirements for coatings are strong adhesion (adhesion) of individual layers to each other, the bottom layer to the substrate, hardness, bending and impact strength, wear resistance, moisture resistance, weather resistance, a set of decorative properties (transparency or hiding power, color, gloss level, pattern and etc.).

The anti-corrosion protective properties of coatings for internal use are classified in accordance with the EU standard 10169:2008. The wet chamber testing process is regulated by EN 13523-26.

Areas of application

Rolled galvanized steel with a polymer coating is used in various fields: the production of profiled roofing systems, elements of drainage systems, fences and fences, bent profiles, and additional elements. In construction, the products are used for the production of metal tiles and corrugated sheets, in industry and instrument making - for the production of external panels and their casings.

Also, polymer-coated steel coils are used in the automotive industry, for the production of facade systems, finishing materials, and stamping. When selecting products, it is important to consider thickness, sheet dimensions, paint type, and specific material characteristics, including zinc coating and polymer thickness.

Advantages and disadvantages of galvanized sheeting

Among the advantages of galvanized corrugated sheets, the following should be highlighted:

• Good corrosion protection properties.
• Durable protective coating.
• Relatively low price - cheaper than painted ones.

Galvanization ensures high resistance of the product to rust. The material retains these properties throughout the entire warranty period. To maintain rust resistance, proper operating conditions must be provided.

Sheets are galvanized using the electrolytic method. It allows the zinc to firmly adhere to the metal. Under mechanical, shock loads and surface deformation, the risk of damage to the protective coating is small.

Due to the absence of the need to paint the original sheet with expensive paints and varnishes, production costs are lower. This also explains the cheaper cost of galvanized corrugated sheets in Moscow.

The disadvantages of galvanized corrugated sheets can be identified as follows:

• low decorativeness;
• less resistance to aggressive environments;
• relatively short service life - from 10 to 15 years.

TYPES OF COATINGS

The company offers polymer-coated rolls of various types:

• TWEED50 is a 50-micron polyurethane coating that has a velvety-matte structure and provides a 25-year guarantee of trouble-free roof operation;
• TIAR35 is a 35 micron thick semi-gloss polyurethane coating with a 20-year service guarantee. TIAR35 is a premium quality polyurethane coating at an affordable price;
• KEVAR – matte polyester coating with a thickness of 30 microns, provides natural color rendering, protects the material from ultraviolet radiation and the adverse effects of external factors;
• SKARDEX is an innovative high-quality polyester coating of 25 microns, which contributes to the long service life of roofing materials due to increased resistance to wear and abrasion;
• SKARDEX cupro is a glossy coating in the color of noble copper with a thickness of 28 microns, which will add unique elegance and exclusivity to your roof;
• SKARDEX matt is a matte polyester coating with a thickness of 30 microns, which is reinforced with polyester resins and is resistant to mechanical stress and UV radiation. The structure of the coating imitates the natural properties of lotus and has excellent self-cleaning qualities when washed by heavy rains;
• SteelArt - in addition to the attractive design of the coating, it also has a multi-layer structure, which ensures the material’s resistance to corrosion, ultraviolet radiation, and mechanical stress;
• Coral is an environmentally friendly matte coating produced by NLMK based on polyester, which helps protect materials from ultraviolet radiation, precipitation, and mechanical damage.

The price of metal in polymer-coated rolls depends on the type of coating, the thickness of the metal, the amount of zinc per square meter and the volume of purchase. Delivery is carried out in Moscow and regions of the Russian Federation.

Galvanized steel with a polymer protective and decorative paint coating (polyester) in rolls

Price list

according to STO07

Since 2004, State Enterprise Steel Structures has been painting coiled steel on its own line for applying polymer coating using the roller method using materials from well-known brands AKZO NOBEL and BASF, which ensures high-quality and durable coating.

The products we produce are used for the manufacture of building metal structures, sandwich panels, roofing tiles, corrugated sheets, instrument housings, electrical appliances, etc. It is highly resistant to atmospheric corrosion, has a decorative appearance and combines strength and ductility.

Due to our own production of paints and varnishes, we produce the widest range of colors of painted metal in the shortest possible time, in minimal quantities.

We paint colors according to the RAL catalog:

9018, 9017, 9016, 9011, 9010, 9006, 9005, 9004, 9003, 9002, 9001, 8028, 8025, 8024, 8023, 8022, 8019, 8017, 8016, 8015, 8014, 8012, 8011, 8008, 8007, 8004, 8003, 8002, 8001, 8000, 7047, 7046, 7045, 7044, 7043, 7042, 7040, 7039, 7038, 7037, 7036, 7035, 7034, 7033, 7032, 7031, 7030, 7026, 7024, 7023, 7022, 7021, 7016, 7015, 7013, 7012, 7011, 7010, 7009, 7008, 7006, 7005, 7004, 7003, 7002, 7001, 7000, 6034, 6033, 6032, 6029, 6028, 6027, 6026, 6025, 6024, 6022, 6021, 6020, 6019, 6018, 6017, 6016, 6015, 6014, 6013, 6012, 6011, 6010, 6009, 6008, 6007, 6006, 6005, 6004, 6003, 6002, 6001, 6000, 5024, 5023, 5022, 5021, 5020, 5019, 5018, 5017, 5015, 5014, 5013, 5012, 5011, 5010, 5009, 5008, 5007, 5005, 5003, 5002, 5001, 5000, 4010, 4009, 4008, 4007, 4006, 4005, 4003, 4002, 4001, 3031, 3027, 3022, 3020, 3018, 3017, 3016, 3015, 3014, 3013, 3012, 3011, 3009, 3007, 3005, 3004, 3003, 3002, 3001, 3000, 2012, 2011, 2010, 2009, 2008, 2004, 2003, 2002, 2001, 2000, 1037, 1034, 1033, 1032, 1028, 1027, 1024, 1023, 1021, 1020, 1019, 1018, 1017, 1016, 1015, 1014, 1013, 1012, 1011, 1007, 1006, 1005, 1004, 1003, 1002, 1001, 1000

Minimum order quantity:

from 200 l.m.
Completion time:
from 2 days!

Rental range:

• steel thickness: from 0.4 to 1.2 mm;
• roll width: 1100, 1250 mm;
• types of coatings: enamel/primer, enamel/enamel, primer/primer;
• roll weight: according to the Customer’s request;
• internal diameter of the roll: 600 mm.

Raw materials for painting:

galvanized steel in rolls according to GOST 14918-80 and GOST R 52246-2004.

Additionally:

• It is possible to paint cold rolled steel coils.
• We make colors according to the client's order.
• We carry out delivery using our own vehicles.
• We pack the roll in a Euro pallet for transportation.
• We apply a protective film.

Price lists