Types of Plate Steel Available in the Australian Market

Types of Plate Steel Available in the Australian Market

Steel comes about as a mixture of carbon, iron and various other elements and has a variety of uses in the global context. You can find applications in construction, manufacturing, infrastructure development, transport and more. One of the terms you might come across in this regard is plate steel. By definition, it is a sheet of steel with a thickness above 6mm. Some sizes are even thicker going up to even the 150mm mark.

These plates are classified into different types with some of the determining factors being composition and the plate’s properties.  In Australia, these are some of the steel plate types available.

Fine-Grained Carbon Manganese Plate Steel

Among the components that may be added to the carbon, iron mixture is a bit of manganese. Any carbon steel with a manganese density of between 1.2% and 1.8% falls under this category. The higher the percentage, the higher the toughness.

One benefit of carbon manganese steel is the low-temperature properties. This means that it is ideal and can handle high-temperature situations with no risk of degradation. Consequently, they are suitable for the creation of boilers. Additional properties include excellent weld-ability, formability, and high strength. Another possible use for this type of steel plate is the making of high-pressure containment units.

Weathering Plate Steel

As the name implies, this type of steel plate can withstand various weather conditions without corrosion. Oxidation is allowed to happen on the plate, and the oxide layer that forms protects the steel underneath. Even so in real-world applications, this protective layer may sustain damage from contact with other objects and phenomena. This is not a cause for a person to worry as the re-oxidation process starts almost immediately forming another protective layer.

In retrospect, some conditions need fulfillment beforehand for the protective layer to form. They include exposure to atmosphere and atmospheric chloride. Also, the steel needs to come into contact with moisture on an on/off basis for some time. This ensures that the steel lasts long even in extreme weather conditions.

The most typical use for this type of steel is in the building of bridges. Nevertheless, by adding paint to cover the steel, you could add years to how long the structure will last.

Quenched and Tempered Plate Steel

Quenching involves heating up the plates and then rapidly cooling them. A coolant such as cold water or an inert gas can get the job done. The composition of the steel plate is determined before the process commences. This ensures that heating temperature, as well as the cooling substance, is determined beforehand and that the desired hardness is achieved.

Tempering also involves heating and cooling. However, there is one significant difference. The cooling happens when you leave the hot steel in still air for a set duration of time. Listed below are some benefits that come about as a consequence of the quenching and tempering process.

  • The product is harder and tougher steel.
  • The steel is more straightforward to weld and overall more ductile.
  • The plates are more resistant to impact, wear and abrasion.

For the above reasons, you will find quenched and tempered plate steel in high impact situations such as construction, mining, and quarrying.

Mild Steel Plate

While all steels have a bit of carbon in them, mild steel contains low amounts ranging from 0.05 to 0.25%. Consequently, mild steel is not very hard. Of course, you can always increase the hardness on the surface by carburizing. This process occurs when heating the steel plate in conditions where carbon is prominent in the surroundings. You can use coal as it harbors a large percentage of carbon.

Some benefits of this type of steel are that it is malleable, ductile and cheap. It is, therefore, more available to most people than harder counterparts. If you are into do it yourself projects, this type of plate would be most useful. Another fundamental property is that it is easy to form without affecting the strength of the plate. Consequently, you will find that most motor vehicle manufacturers will use this for car bodies.

A stark contrast to the mild steel plate is high tensile steel. This is meant to withstand the pressure of being pulled apart without breaking.


The above list may not be comprehensive. There are numerous possibilities for combining the various elements to give the final steel result. There are also countless other properties exhibited by the steel formed. Talk to different manufacturers and find out if they have a type that suits your needs. If not you can request custom plates.



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