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August 22, 2020

Special Graded Steel Plates You Should Know About

Special Graded Steel Plates


What are the different types of special graded steel plates?

  1. ABS
  2. ASTM 572
  3. ASTM 283 GR
  4. AR Plates


Graded steel plates are used in many types of applications. Alterations in the grain structuring of steel material can either increase or decrease the attributes of a certain property. For example, increasing the strength of steel involves complex metallurgy like cold-working, precipitation hardening, and the like.

Ultimately, there are many markers that define the capabilities of a particular steel product. If you want to make sure that you’re using the proper steel grade, then continue reading to learn more.



Steel plate coils

The first kind of steel grade that you’ll encounter on this article is called the ABS. ABS denotes a classification by the American Bureau of Shipping that a particular steel plate has been approved for use in mechanical shipbuilding endeavors.

ABS-graded steel is usually produced through the hot-rolling method — which, basing from the name alone, involves subjecting the raw steel material to further high-temperature processes. This temperature is usually set above the steel’s recrystallization temperature, or the threshold where steel is reformed.

Having said that, the hot-rolling method produces thick-walled steel plates that are used for shipbuilding, particularly for hull components. This part is essential as it secures the cargo, passengers, and other complex machinery that are found in the interior of the ship’s structure. ABS steel plates make the perfect utility for hulls because of their high-yield strength that is able to withstand certain impacts. This is often divided into four other grades with varying yield and tensile strength gradings.



Close up of an airplane

Unlike ABS-graded steel plates, ASTM A572 steel can usually be found in aircraft applications or other kinds of general construction. This type of grade is determined by the American Society for Testing and Materials.

The steel grade sets the standard for high-strength and low-alloy steels which usually have a greater resistance to corrosion compared to carbon steel. Apart from this, it also results in the production of steel that is greater in hardness as well as strength.

Elements that are typically alloyed to HSLA steel include silicon, manganese, vanadium, tungsten, copper, and nickel, just to name a few. Within the ASTM A572 exist other grades like 50, 55, 60, and 70. Each of these figures corresponds to the yield strength that is exhibited by the product. They’re accompanied by a KSI unit of steel strength and quality (Kilopounds per Square Inch).

ASTM A572 can be found as part of the components of a building’s base in order to increase structural integrity. For larger-scale components, this special steel sheet grade is also used to form the body of an aircraft. Due to its high strength, it can protect against external elements that may create deformations on the vehicle.



A bridge made with steel plates

ASTM A283 is another grade that denotes classification for carbon steel — in particular, for those that possess low-to-intermediate tensile strength. It can also arrive in other grades such as B, C, or D.

ASTM A283-grade steel plates can be found in general applications of the product. They can serve as support profiles to increase the stability and durability of a particular construction or civil work. In this regard, steel plates can be used by itself or it can also be subject to further manufacturing processes to create columns and other types of building profiles.

Due to the different classifications, it’s important for one to determine whether a low-tensile or intermediate tensile strength steel should be used. For bridge plate girders, these steel plates are usually welded or joined together with other fittings to create multiple I-section steel profiles. Because bridges are usually passed on by many types of vehicles that are carrying heavy loads, it’s important that the A283 steel being used is of intermediate grading.

On the other hand, steel plates that may be used only as part of industrial facility flooring need only possess a low tensile strength rating. These plates would be durable enough to accommodate activities like simple machine navigation and daily foot traffic.


AR Plates

A conveyor belt made with steel plates

As mentioned before, one of the processes that can improve the corrosion-resistant qualities of steel involves the alloying of specific elements.

Out of all the graded steel plates that you have encountered on the list so far, AR plates are the ones that are least prone to the destructive effects of weathering. AR plates also have a higher carbon content, meaning they can be used in virtually any type of installation that requires greater strength and hardness. High-carbon AR plates typically contain 0.6% up to 1% of carbon, while the content for ultra-high carbon AR plates falls within the 1.25% to 2% range.

Unlike the other steel plates, AR plates aren’t common for structural uses such as bridges or buildings. Instead, they’re best for high-impact uses that truly need to take advantage of steel hardness. These can range from simple manufacturing conveyors to more specialized products like body armor, serrated blades, or gear wheels.


Key Takeaway

The graded steel plates that have been included in this list aren’t necessarily exhaustive, but they can give you an idea of just how the various grades differ from one another.

These graded steel plates are typically classified according to the qualities that are present in their grain microstructure. Steel plates can come in high-carbon and high-alloy content. Meanwhile, certain properties like tensile strength, yield strength, hardness, and corrosion-resistance can also be modified through different means. This refers to heat treatment and other types of fabrication processes that can manufacture many kinds of differentiated steel plates.

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