Услуги горячего цинкования завода Агрисовгаз в Санкт-Петербурге

HOT GALVANIZING BATH

hot-dip galvanizing

from 35,000 ₽ / t

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REQUIREMENTS FOR
METAL SURFACE
BEFORE GALVANIZING

The following are not allowed on the surface of the base metal of products:
cracks, blisters, swelling, delamination, metal splashes, rolled-in scale, burrs, build-ups, edge curls, pores, inclusions, welding slag, residues of molding material, graphite, as well as the presence of paint coating.

It is not recommended to leave residues of lubricant, metal chips, marking paint, paper labels, marking adhesive, preservative materials, cooling lubricants with silicone oils, and traces of agents used for protection against welding spatter on the surface of the base metal of products.

On the surface of cast products there must be no pores or shrinkage cavities.

The surface of the product after gas, laser or
plasma cutting must be cleaned of spatter and build-ups, and sharp edges must be blunted to ensure guaranteed coating thickness and the strength of its adhesion to the base metal. Cut fragments must not get inside hollow profiles.

Individual dents, scratches, grinding marks and other defects caused by the production method are allowed on the surface of the product.

If the design solution and/or the steel grades used do not allow obtaining a coating within the specified thickness range by changing the galvanizing process parameters, the surfaces of the products may be subjected to shot blasting to enable an increase in the thickness of the zinc coating.

120

tons
per day

3000

tons
per month

3600

tons
per year

hot-dip galvanizing
technology

HANGING METAL PRODUCTS ON THE CROSS-BEAM
Wire of various thicknesses is used for this purpose. Accordingly, the products must have technological holes that are used for hanging.

Degreasing
In this process, various contaminants and oil films are removed from the metal surface. The presence of paint coating that cannot be removed by this method is not allowed.

Rinsing
Removes residues of degreasing solutions from the surface.

Acid pickling
Removes heat treatment scale and rust from the metal surface. For metal with a high degree of rusting, complete cleaning by this method is impossible.

Rinsing
Removes residues of pickling solutions from the surface.

Fluxing
The metal surface is coated with an aqueous chemical composition that makes it possible to obtain a zinc coating.

Drying
The steel structure is placed in a drying chamber where the flux is dried and the metal is heated to a temperature of 100 - 120°C.

GALVANIZING
Dipping the structure in molten zinc. When the structure is removed, excess zinc flows back into the molten bath. For unimpeded zinc drainage, most steel structures must have specially prepared technological holes. In their absence, the possibility of galvanizing is excluded.

Cooling
The structure removed from the galvanizing bath has a temperature close to 450°C. Its cooling to ambient temperature occurs either in a clean water bath or in the open air.

Removal of metal products from the cross-beam
Galvanized products are removed from the cross-beam, packaged if necessary and transported to the warehouse.

RECOMMENDED STEELS FOR HOT-DIP GALVANIZING

GOST 380	GOST 1050	GOST 27772	GOST 19281
1 St0	St05kp	S235	09G2S
2 St1kp	St08kp	S245	11G1S
3 St1ps	St08ps	S255	17GS
4 St1sp	St08	S275
5 St2kp	St10kp	S285
6 St2ps	St10ps	S345K
7 St2sp	St10
8 St3kp	St11kp
9 St3ps	St15kp
10 St3sp	St15ps
11 St3Gps	St18kp
12 St3Gsp	St20kp
13 St4kp	St20ps
14 St4ps	St20
15	St25
A	B	C	D

Hot-dip galvanizing is applied to products made of low-carbon steel and steels according to GOST 380, GOST 1050, GOST 19281, GOST 27772 and their equivalents, as well as castings from steel, gray or malleable cast iron.

THE CUSTOMER'S MAIN RULE FOR HOT-DIP GALVANIZING TECHNOLOGY IS:
"Buy steel with regulated silicon and phosphorus content; each purchased batch of steel products must be accompanied by a certificate indicating the chemical composition of the steel according to the ladle sample".