Galvanised Steel

 

Some commercial steel products are subjected to the electrolysitic application of a layer of zinc or zinc and nickel in order to obtain effective resistance to corrosion and as such have excellent qualities for welding and moulding.


There are various regulations and qualities of galvanised materials. By way of example, ROS DUCTING, S.L.U. uses sheet metal of galvanised steel, with electrolytic protective qualities of DX51D/Z140-275NA, in accordance with regulation UNE-EN 10.087, and with thicknesses of 0.8 / 1.0 / 1.2 mm.


The characteristics of the material in accordance with regulation UNE-EN 10.327 are shown in the table below:

     
Table of Characteristics for Galvanised Steel
Type of galvanised steel
EN 103227 DX51D+Z140-275
Yield strength Rp0.2 (Mpa)  ≥140
Tensile strength (Mpa) 270-500
Elongation A∞ (en%) ≥22
Elasticity module at (KN/mm²) 210
Poisson coefficient 0.3
Coefficient of linear thermal expansion from 20º to 100º C (µm/mºC) 12.0

 

 Hot-Dip Galvanised Steel 

 

Galvanising steel is a common practice for protecting steel parts which are to be exposed to adverse environmental conditions for long periods of time. Hot-dip galvanising is an industrial process used to counter corrosion in a wide variety of steel or iron products.

 

The process involves the immersion of the parts in a bath of liquid zinc at 450°C. The hot-dip process results in the part being covered in zinc, which attaches itself to the surface and in addition, forms a zinc-iron alloy which is highly-resistant to different corrosion agents in the atmosphere, in water or in the ground.


KMH manufactures its parts using the hot-dip process.

 

 Stainless Steel 

Stainless steel is an alloy which contains iron, chrome, carbon and other elements, mainly nickel, molybden, manganese, silicone and titanium, etc., which lends them a certain resistance to some types of corrosion. Naturally, the influence of various elements produces distinct variations in the intrinsic characteristics of the diverse types of metal. Regulation EN 10088 defines stainless steel as any iron-based alloy with a minimum of 10.5% of chrome.
 
The main component of the alloy must be iron. The reason for this definition is in the characteristics of these alloys to effectively resist a corrosive attack, a property which was shown in experiments by Tamman. The results of these experiments reflect how the percentage of chrome in alloy determines the minimum rate of weight loss in a corrosive environment.
 
Resistance to corrosion is due to the property of these alloys to become passive in an oxidising environment (e.g. the air) through the formation of a superficial film of absorbed oxygen. These conditions are referred to as stainless steel in a “passive” state.
 
The passive film reforms when damaged if the atmosphere is sufficiently oxidising and oxygen enters into contact with the alloy. This film protects the underlying material from the corrosive attack.
 
ROS DUCTING, S.L.U. and KMH manufacture parts in AISI 304 stainless steel while products in AISI 316 steel can be made to order.
 

 Powder Coated Steel

 

 

Black steel requires protection in order to avoid corrosion. One economic option is painting. Painting may take the form of a directly-applied lacquer or kiln firing. A third option is glazing, where a part coated with an enamel glaze is fired at 900 ºC.
 
KMH has a range of steel parts painted with RAL 7032, and painted or glazed products may be supplied to order in any other colour shown in the RAL. ROS DUCTING, S.L.U. colour chart.

 

 

Pol. Ind. Pla de Poliger, Sector Nord - Sau 1 -
17854 SANT JAUME DE LLIERCA (Girona) SPAIN - Tel. +34 972 26 14 67

Distributed by: Micrologic, S.L.U.

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