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Hot selling Galvanized steel coil for roofing sheet

Hot selling Galvanized steel coil for roofing sheet

Galvanised steel coils are widely used in the following industries:

In the construction industry: to manufacture structural elements low-rise construction, light steel thin-walled structures, sandwich panels, lining of heat pipelines and various heat insulation, conditioning systems, metal roof shingle, profiled sheeting, culvert pipes, cladding of entry doors, elevators, reinforcement profiles for PVC windows and plastic doors, European-type fasteners for plasterboards, etc

product details

widely used in the following industries

In the automotive industry: to manufacture external and internal car body parts, as well as to repair external public transport body parts, eg for buses and trams)

In the machine building and instrumentation industries: to manufacture cases for electrical and mechanical equipment, home appliances, metering devices and packing

To manufacture houseware (tableware, bowls, buckets, tanks, baths, etc)

To manufacture colour-coated (and other type of coating) rolled steel

Hot-dip galvanized coils can be divided into hot-rolled galvanized coils and cold-rolled hot-dip galvanized coils, which are mainly used in construction, home appliances, automobiles, containers, transportation and household industries. Especially steel structure construction, automobile manufacturing, steel silo manufacturing and other industries. Their main features are: strong corrosion resistance, good surface quality, conducive to deep processing, economical and practical, etc.

Product Parameter

Q/BQB 420-2003	EN 10142:2000	EN 10142:1990	JISG3302-1994	ASTMA653M-2002
	EN 10147:2000	EN 10147:1991
	EN 10292:2000
DC51D+Z(St01Z, St02Z, St03Z), DC51D+ZF	DX51D+Z, +ZF	FeP02GZ, ZF	SGCC	CS Type C
			SGHC
DC52D+Z(St04Z) DC52D+ZF	DX52D+Z, +ZF	FeP03GZ, ZF	SGCD1	CS Type A, Type B
DC53D+Z(St05Z) DC53D+ZF	DX53D+Z, +ZF	FeP05GZ, ZF	SGCD2	FS Type A, Type B
			SGCD3
Distinguish		Surface and Appearance Requirements
Home appliances	Micro-wave oven(L/S), home appliance side panels, etc.	Use smooth small spangle or zero spangle hot-dip galvanized steel strip, and the defects that must not exist include rust, corrosion, perforation, delamination, serious head-up lines, impact damage, fold marks, serious edge burrs, large waves, Intensive periodic concave and convex points, obvious zinc slag, zinc spot, galvanized line, zinc layer falling off
	Appliance door panels (T/R, H/G)wait	Use zero-spangle hot-dip galvanized steel strip, and the defects that must not exist include rust, corrosion, perforation, delamination, severe head-up lines, impact damage, fold marks, serious edge burrs, large waves, and dense periodic bumps. , Obvious zinc slag, zinc spot, galvanized line, zinc layer peeling off
Architecture	Building exterior decoration (C/S)	Use smooth small spangle or zero spangle hot-dip galvanized steel strip, and the defects that must not exist include rust, corrosion, perforation, delamination, serious head-up lines, impact damage, fold marks, serious edge burrs, large waves, Intensive periodic concave and convex points, obvious zinc slag, zinc spot, galvanized line, zinc layer falling off. To some extent, the surface roughness is allowed to be slightly larger

Hot selling Galvanized steel coil for roofing sheet 1(1)svf

Spangle type

Hot selling Galvanized steel coil for roofing sheet 2(1)t3g

wHY choose us

Hot selling Galvanized steel coil for roofing sheet 3(1)30o

SUFFICIENT STOCK

Galvanized coil factory direct sales, complete models, sufficient inventory, welcome to inquire, honest management, large quantity and high price, factory direct supply, spot supply welcome your consultation, professional management of automotive steel, galvanized coil, hot-dip coil, Sufficient stock of various models.

Hot DIP/Cold Rolled Galvanized Steel Coil G90 Z180 Z275 Dx51d, Dx52D, Dx53D SGCC/PPGI/PPGL Electrolytic Galvanized Steel Zinc Gi Coil Galvanized Steel Coil

Attention to detail

Hot-dip galvanized strip steel is produced with hot-rolled strip steel as the substrate through pickling, cold rolling, heating reduction, galvanizing and other technological processes. Its products can fully meet the international leading standards and can be obtained in the construction industry. A large number of applications can also be used in industries such as automobiles, railway locomotive manufacturing, warehouse board manufacturing, highway guardrails, etc. The surface spangles can be customized according to requirements.

Provide deep processing

Galvanized steel coils can be processed according to customer requirements: one-stop service such as processing Kaiping, galvanized steel coil slitting, cutting small plates, and door-to-door delivery. The galvanized steel coil slitting width is 5mm-1500mm, and the thickness is 0.1mm-3mm.

Process Flow

Hot selling Galvanized steel coil for roofing sheet 4(1)1zc

Definition of plating

(1) Normal spangle coating

In the normal solidification process of the zinc layer, zinc grains grow freely to form a coating with obvious spangle morphology.

(2) minimized spangle coating

During the solidification of the zinc layer, the zinc crystal grains are artificially restricted to form the smallest possible spangle coating.

(3) Spangle-free coating spangle-free

It is obtained by adjusting the chemical composition of the plating solution, does not have a visible spangle morphology, and has a uniform surface coating.

(4) Zinc-iron alloy coating

The steel strip after passing through the galvanizing bath is heat treated to form an alloy layer of zinc and iron throughout the coating. This coating has a dark gray appearance without metallic luster, and is easy to powder during the violent forming process. In addition to cleaning, the coating can be painted directly without further treatment.

(5) differential coating

For both sides of the galvanized steel sheet, coatings with different zinc layer weights are required.

(6) Smooth skin pass

Smoothing is a kind of cold rolling of galvanized steel sheet with a small amount of deformation for one or several of the following purposes.

Improve the appearance of the galvanized steel sheet surface or be suitable for decorative coating; temporarily minimize the slip line (Lüdes line) or wrinkles produced when the finished product is processed.

defect

Mainly include: shedding, scratches, passivation spots, zinc particles, thick edges, air knife streaks, air knife scratches, exposed steel, inclusions, mechanical damage, poor performance of the steel base, wavy edges, buckling, size incompatibility, Embossing, inconsistent zinc layer thickness, roll printing, etc.

The main reasons for the zinc layer to fall off are: surface oxidation, silicon compounds, too dirty cold rolled emulsion, too high oxidizing atmosphere and protective gas dew point in the NOF section, unreasonable air-fuel ratio, low hydrogen flow, oxygen infiltration in the furnace, strip steel The temperature of entering the pot is low, the furnace pressure in the RWP section is low, and the furnace door suction, the furnace temperature in the NOF section is low, the grease does not evaporate, the aluminum content of the zinc pot is low, the unit speed is too fast, the reduction is insufficient, and the zinc liquid stays The time is too short and the coating is too thick.

The causes of white rust and black spots are as follows: black spots are formed by further oxidation of white rust.

The main causes of white rust are

(1) Poor passivation, insufficient or uneven passivation film thickness;

(2) The surface is not oiled or there is residual moisture on the surface of the strip;

(3) The surface of the strip steel contains moisture during coiling;

(4) The passivation is not completely dried;

(5) Moisture or rain during transportation or storage;

(6) The finished product has been stored for too long;

(7) The galvanized sheet is in contact with or stored together with other corrosive media such as acid and alkali.

The finished product is allowed to be stored in the warehouse for a maximum of three months to avoid oxidation due to excessive storage.

Factory production line

Our client

PACKING DETAILS

Hot selling Galvanized steel coil for roofing sheet 5(1)tct