What do you understand by steel plates?

08 Apr.,2024

 

Steel Plate & Sheet - Grades & Finishes

 

Grades

 

Carbon steel is an alloy of iron and carbon, often with other elements in small percentages that affect the properties of the final product.

A few of the most common grades of steel plates and sheets are:

  • A36 - a low carbon steel with good strength, formability that can be securely welded with a minimum yield strength of 36,000 PSI
  • A572-50 - higher strength steel with a minimum yield of 50,000 PSI and increased corrosion resistance
  • A516-70 - steel with a minimum tensile strength of 70,000 PSI that is generally used in pressure vessels and boilers
  • AR400 -  abrasion resistant, quenched and tempered alloy steel with a high level of hardness, making it brittle and so it is not intended for structural applications
  • A588 - also known as Corten, this steel weathers well, forming a stable rust-like appearance that eliminates the need for painting
  • A1011 - a hot-rolled carbon steel alloy primarily used for sheets with high strength and formability

There are many other grades of steel plates and sheets with specialized properties.  If you need it, we can get it! 

Yield strength is the amount of force that can be withstood before permanent deformation. Tensile strength is the amount of force required to pull something (like a sheet of steel) to the point where it breaks.

 

Finishing and Treating 

Steel sheets and plates are made by rolling a slab of steel through a series of rollers until the desired thickness and material properties are achieved. Each stage in the rolling and finishing process produces a salable sheet or plate with distinct finish and properties.

Hot Rolled Steel

This is the most common and simple finish and the first step to making steel plates and sheets. A steel slab is heated, typically to 1,700 degrees F, and passed through a series of rollers - each set of rollers making the slab thinner until the desired thickness is achieved. Then the steel is allowed to cool to room temperature and cut to size or rolled into large coils.

Hot rolled steel is the easiest and cheapest sheet steel to find. It is fairly ductile, and thinner sheets can be easily formed with hand tools. Its dimensions are less refined compared to cold rolled steel. 

Pickled and Oiled

A roll or sheet of hot-rolled steel is dipped or passed through a pickling bath. A solution of very strong acid removes the scale and dirt from the sheet or plate, leaving the raw steel exposed. It is then passed or dipped in an oil bath to protect the raw steel from oxidation, which would begin immediately without protection, especially in humid environments.

Steel that has been pickled and oiled has the same material properties as straight hot rolled steel but is cleaner to work with and easier to clean for painting.

Cold Rolled Steel

Hot rolled steel sheets or plates, that have previously been pickled and oiled, are again run through a series of rollers without the addition of heat. This compression of the steel at room temperature causes it to become work hardened.

To produce the finished product, the steel is then annealed and tempered.

Annealed

Cold rolled sheet or plate is put into a furnace and heated to a temperature below the melting point of the material. The steel is removed from the furnace and allowed to cool to room temperature. When heated, the steel grain realigns and some of the effects of work hardening are diminished.

Temper Rolled

Annealed steel is passed through one more set of rollers. These rollers are primarily to refine the finish further and diminish slight deformities or warps in the steel. 

 

Cold rolled steel is made to much tighter dimensional tolerances and the surface is more uniform and refined. Typically the edges are quite square. This steel is harder and stronger but won't hold shape as well as hot rolled steel when it is bent. It is less ductile and when bent, the deformed zones are more likely to spring back than to take the bend. Steel sheets or plates that make it to this stage are ideal when looks and strength are important.

Further Finishing

Specialized coatings can be applied to the surface of the steel via dipping or electroplating. Most commonly zinc is applied to the surface to produce what is known as galvanized steel. Learn more about the galvanizing process here.

There are many types of steel plates available in the market. However, some of the commonly used steel plates in construction industry include mild steel plates, checkered steel plates, galvanised steel plates, etc. The use of steel plates in construction, manufacturing, automotive and other industries has steadily been rising over the months. This article discusses the meaning of steel plates, their types and industry-wide usage, and what factors to consider when selecting steel plates.

 

Steel is one of the key materials used in construction. According to the World Steel Organisation, 50% of the world’s steel demand comes from the construction industry. Whether it is the use of TMT bars or steel plates in construction, there is rising demand for and growth of steel in India. From building a small house to a skyscraper, school complex to carpark – everywhere steel is used extensively.

Choosing the right type of steel depends on various factors. For example, TMT bars can provide safety against natural disasters making them an in-demand building construction material. Similarly, corrugated roof sheets are used as roofing solutions for their strength and utility. In this article, we will take a look at the use of steel plates, the type of steel plates used in the building and construction industry and the way of choosing the right steel plates.

What is a steel plate?

A steel plate is any steel material that is formed into a plate. These plates come in various lengths, widths, shapes, finishes, etc. Steel plates are used in several ways in construction. Considering each project is different, expectations from steel plates vary.

For example, skyscrapers, railways, infrastructure projects, housing buildings, etc., require different kinds of steel plates. Moreover, weather conditions, temperatures and pressure also vary. As a result, different types of steel plates need to be used.

Common types of steel plates used in construction

Although there are various types of steel plates available in the market, here are a few types of steel plates commonly used in the construction industry.

1. Galvanised steel plates

Just like galvanised steel coils, galvanised steel plates are coated with zinc. It is made by immersing steel into molten zinc. The zinc coating offers steel strength and corrosion resistance. The important feature it offers is that galvanised steel can be moulded well as per the manufacturing requirement, and still, it offers the required strength to the finished structure. This is one of the most advantageous features of galvanised steel plates, which make is the right choice for construction.

Here are a few other key features of galvanised steel plates that make them an ideal choice for construction.

  • Corrosion resistance
  • Wear-tear resistance
  • Strength
  • Capability to withstand a wide range of temperature
  • Low maintenance

Galvanised steel plates are used for structures, roofing, ducting, etc., purposes. Apart from construction, galvanised steel is also used in the automotive industry and home appliances industries.

2. Mild steel plates

Mild steel plates also known as MS plates are one of the most common steel plates used in construction. These plates have gained popularity due to its versatility. Mild steel is a type of carbon steel, and these steel plates are available in various thicknesses. It is a manufacturing-friendly material. Meaning it can be moulded as per the design and can be easily cut and bent.

Here are some of the advantages of mild steel plates for project manufacturers:

  • Mild steel plates can be welded easily to form different shapes
  • It can be easily cut and bent
  • These plates do not require special cutting tools or skills
  • Corrosion resistance
  • High tensile strength
  • Durability
  • Capability to withstand high temperatures

Mild steel plates are widely used in the construction of infrastructures like buildings, warehouses, railway stations, transport terminals, bridges, etc. MS chequered plates are commonly used for anti-skid floorings on bridges, walkways, etc. MS steel plates are also used in the shipping industry and for manufacturing offshore equipment.

3. Checkered steel plates

Checkered steel plates can easily be recognised by its raised surface in the design of checkers. These plates are widely used in flooring. This is because the raised surface design eliminates the possibility of slipping while walking on it. Hence, flooring of walkways, carparking, foot over bridges, elevators, etc., are made of checkered steel plates. Additionally, these plates are easy to maintain and are resistant to dirt, oil, etc.

Along with the construction industry, it is also used in automotive, railways, and manufacturing industries. You may have seen railway coaches’ checkered flooring, bus flooring, etc. In the industrial environment too, checkered steel plates create a safer environment to walk.

Also read: How to calculate chequered plate weight

4. Black iron (BI) plates

Black iron plates are manufactured from mild steel and have low carbon content. It mainly contains aluminium and copper. Black iron steel is widely used in making piping applications, especially to transport liquids and gases such as natural gas.

BI plates are also used for making outdoor advertising billboards, etc. Advantages of BI plates include corrosion resistance, fire resistance, durability, lightweight, etc. Other uses of BI plates include manufacturing air conditioning systems, automotive, and so on.

5. Galvanised iron (GI) plates

Galvanised iron plates are different from galvanised steel plates. Usually, galvanised iron is iron that has undergone galvanisation treatment. Iron is submerged into molten zinc and is applied with zinc coating. It may also undergo another galvanising treatment namely electrogalvanising. These treatments offer iron strength and resistance.

GI plates are used in doors and wall panels, steel roofing, etc.

Using the right type of steel plates in your project?

  • Determine the needs of your project and understand weather conditions and temperature range. This will help you to eliminate types of steel plates that are not suitable for your kind of project.
  • Understand if the geographical area is prone to any natural calamities such as cyclones. In such a case, the steel structure needs to withstand heavy winds and steel need to be chosen accordingly. Alternatively, areas with heavy rainfall need steel that has better corrosion resistance.
  • Consider the nature of your project – e.g., if your project is an industrial structure, you also need to consider what the factory would make and the raw materials it would be using. Raw materials such as chemicals, gas, etc., need a material that can withstand its properties. For example, BI steel pipes are used for piping systems used for natural gas.

There are many types of steel plates available in the market offering different features. You need to focus on the needs of your project and cost.

Overcoming challenges of procuring steel plates

  • The steel industry is facing many supply chain related challenges. Hence, you need to place an order at the right time so that your project does not come to a halt because of a lack of raw material.
  • You can formulate a raw material sourcing strategy for your project.
  • There are many trusted steel suppliers in India. However, with Tata nexarc’s Procurement you can buy steel metal online at the best price.
  • Keep an eye on the latest innovations in steel technology, so that you can choose the right material for your project.

What do you understand by steel plates?

Types of steel plates and its usage in construction