Steel Plate

Steel Plate

Steel plates are hot rolled products that have a relatively high thickness. Products having a thickness of over 4.5 mm are classified as steel plates, and those having a thickness of over 100 mm are called thick steel plates. Slabs of steel plates made through continuous casting are tailored to the dimensions specified by the customer through rolling and cooling before being cut into their final sizes.
POSCO uses a computerized automatic control over its entire process to produce high-quality steel plate. This allows us to ensure accuracy as well as full customization to meet customer needs. Our steel plates are extensively used for members for welded structures.

Their common applications include shipbuilding, construction and heavy machines, offshore structures and wind farms, pressure vessels (storage tanks) and line pipes (carrying oil). Key features required include chemical composition, material, dimensions, form, surface and internal quality, and additional requirements depending on the application include weldability, workability, heat resistance and anti-corrosion.


Product variants

  • Steel Plate for Shipbuilding

    Shipbuilding steel refers to steel commonly used for shipbuilding. In fact, shipbuilding is the area where steel plates are most extensively used. Shipbuilding steel requires a wide variety of features in terms of strength, dimension, surface, form and impact toughness (represented as grade A to F) depending on the application.
    All of our steel plates, including regular steel and high tensile steel approved by classification societies of many countries as well as TMCP-manufactured high tensile steel that allows for highly efficient electro-gas arc welding, are used for shipbuilding.


  • Steel Plate for Structure

    Structural steel is commonly used for ground structures, welded structures, bridges, industrial machines and many other similar applications. Wide applications mean a wide range of specifications used. Good weldability is essential because the use of these products always involves welding.
    Strength matching the use and the specifications used is also required. Typical methods applied to the production of this product include regular rolling and TMCP process, but heat treatment is often used when high tensile strength of over 60 kg is needed.


  • Weather Resistant Steel

    Atmospheric corrosion resistant steel is used for large on- and offshore structures including bridges. It contains elements such as Cu, Cr and Ni for improved weathering and corrosion resistance. Some of its applications need painting while others don’t. Those used for the latter have thin and robust, anti-corrosive films on the surface that are formed through reaction with air.


  • Steel Plate for Mold Base

    Steel for molds is a kind of structural rolled steel, mainly used for various heavy equipment and machinery products. These products are particularly important for machinability and abrasion resistance, which also determines the lifetime of machine products.


  • Steel Plate for Linepipe

    Also commonly called linepipe steel, pipe and tubular steel is typically used for mass transport of key energy sources such as crude oil and natural gas. Therefore, it must provide the durability required to carry such key energy sources over a long range from the point of production to the point of consumption.
    Recently, many other features are expected of the steel as its applications expand resulting from less and less availability of close-to-reach energy sources. Examples include impact toughness required for use at extremely low temperatures and resistance to hydrogen induced cracking and/or stress corrosion cracking required for use in a harsh environment where H2S pressure is high.


  • Steel Plate for Offshore Structure

    Offshore steel is widely used for large scale platforms for drilling and/or production of oil. Required features for this steel include good ductility in the direction of thickness and low-temperature toughness that can help the platform withstand harsh offshore conditions such as drastic changes in underwater currents and waves on the surface. We deliver anti-lamellar tear steel and HAZ CTOD tested steel that can provide a much higher level of such features.


  • Steel Plate for Boiler & Pressure Vessel

    This steel is extensively used for vessels designed to store energy sources such as crude oil, natural gas and LNG. These vessels must provide the environment required for the energy source contained including high pressure and extremely low or high temperature. Therefore, the steel used for this purpose requires excellent workability, weldability, heat resistance and corrosion resistance.
    POSCO’s boiler & pressure vessel quality steel is widely used for applications that handle various energy sources, including gas ball tank, LPG tanks, crude oil or other liquified material tanks, storage tanks and thermal power boilers.


  • Steel Plate for Low Temperature Pressure Vessel

    Low-temperature pressure vessel steel is made by enhancing the extremely low-temperature property of existing boiler and pressure vessel quality steel. It is also called high nickel (Ni) steel as it has a high level of nickel content.
    This product features superb toughness against extremely low temperatures and good resistance to corrosion enabled by the nickel contained. Its common applications include LNG tanks and liquified gas storage tanks. It is also often used in place of expensive stainless steel.

  • High Manganese Steel

    High manganese steel contains 3 to 27 percent of manganese. It is World First (WF) material featuring better performance and economic feasibility. Other features include high strength, low-temperature toughness, abrasion resistance, non-magnetic and anti-vibration.

  • Abrasion Resistant Steel

    This is a steel plate featuring a high resistance to abrasion. Its typical applications include excavator buckets, crusher blades and dump truck beds. It must be thin and wide before being used.


  • Bulletproof Steel Plate

    This is steel with a high tensile strength that can provide bulletproof capability and sufficient protection. It is widely used for the outer panels of armored personnel carriers, tanks and self-propelled guns/howitzers.


  • High Strength Steel

    This product is ideal for components requiring high strength and toughness. It is widely used for specially designed cranes, trailer frames, hoist and many other similar machines.




6261, Donghaean-ro,
Nam-gu, Pohang-si,
Republic of Korea


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