Material Selection Guide

Galvanized Steel

What is galvanized metal?

Galvanized metal is iron or steel that has been coated with thin layer of zinc. The zinc coating protects the metal from rusting by being a barrier between the atmosphere which would cause the iron or steel to corrode.

Who invented galvanized steel?

“This process was first invented and developed in France and England in 1837, in which a sheet of steel was dipped in a molten zinc bath (a method called "hot dip galvanization").” - Corrosionpedia

Does galvanized steel rust?

The purpose of galvanizing steel is to prevent rusting. The zinc coating will not rust, however, as this material deteriorates and is worn away the underlying steel becomes exposed and can begin to rust. The lifespan of galvanized steel before it begins to rusts depends on the environment that it is in.

Is galvanized steel magnetic?

Galvanized steel is steel that has been coated with a zinc coating. Steel is an iron carbon alloy. Metals containing iron are known as ferrous materials and are magnetic. Although the zinc coating is a non-ferrous material it does not impede the magnetic properties of the underlying steel layer.

How to tell if steel is galvanized?

To be absolutely certain whether steel has been galvanized laboratory testing is required. A quick way to determine if steel is galvanized is to check it with a magnet and then submerge it in a saline, salt water solution or place a salt water soaked rag on the sheet. If it is not magnetic then it is most likely being confused with stainless steel, and if the material begins to rust then it has not been galvanized.

Can you weld galvanized steel?

While galvanized steel can be welded it is very dangerous because the process produces zinc oxide, a metal fume which is poisonous.

Is galvanized steel toxic?

When galvanized steel is heated it releases zinc oxide, a metal fume which is poisonous. Galvanized steel is safe to handle and according to it is safe to create drinking buckets from and does not become toxic until the zinc has worn away and the steel begins to rust.

Can you paint galvanized metal?

Galvanized steel is difficult to paint because the zinc coating prevents paint from adhering properly.

Stainless Steel

What is stainless steel made of?

Stainless steel is a metal alloy with consist of iron with additions of at least 10.5% chromium and 1.2% carbon by mass. Stainless steel also consists of Nickel, Manganese, Molybdenum, and Silicon

Who and when was stainless steel invented?

According to BS Stainless Harry Brearly, a cutlery manufacture is typically credited for the invention of Stainless Steel with his knives that were produced in 1913.d

Does stainless steel rust?

Stainless Steel is a metal alloy that is rust and corrosion resistant. Whether or not Stainless steel will rust is dependent on the environment it is in. The Chromium in the alloy protects the material and provides its corrosion resistance. Alloys of stainless steel with greater amounts of Chromium will be more rust resistant. Stainless steel can be passivated which will remove, reduce or eliminate rusting.

How to tell if something is stainless steel?

Stainless steel will have a similar weight to steel but will not be magnetic. The density of Stainless Steel is 800kg/m3. If the material looks like Stainless Steel but is magnetic it is carbon steel with a coating.

Is stainless steel magnetic?

Stainless Steel comes in a variety of different alloys some are magnetic, some aren’t. The most common types of Stainless Steel are 304 and 316 neither of which are magnetic. Other alloys 409, 410, 420, 430, 439, 440, and 2205 are magnetic.

Can you paint stainless steel?

Stainless steel can be painted but requires proper prepping. Paint will not adhere to polished stainless steel. The material will need to be roughed up, cleaned, and primed before painting.

Can you weld stainless steel?

Stainless Steel can be welded but the different material properties require a unique weld settings compared to carbon steel.


Corrosionpedia - Galvanized Metal
Corrosionpedia - Galvanized Steel
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