What is construction steel? The best construction steels!

For more than decades now, steel has become the main raw material in construction. ready-made steel structure warehouse building Dubai has created many great changes in people’s lives.

So, what is construction steel? What types of construction steel are there? Which type is good? Which construction steel manufacturing company is good? Take a look below!

What is construction steel?

Simply put, construction steel is the steel good to use in construction. Construction steel is structural steel. It refers to steel good to use as raw materials in construction works. Steel is good to use in the construction of pre-engineered steel buildings.

What types of ready-made steel structure warehouse building Dubai is?

Based on the chemical composition, we can distinguish many different types of steel. Steel good to use in machinery manufacturing, aircraft steel, ship hulls, motor vehicle steel, military use, etc.

However, in this article we will consider the types of steel good to use in construction. Stay tuned in the next part.

According to the chemical composition of steel

• Carbon steel: The main component of steel: Fe – C (<1.7%). Carbon steel has no other alloys.
  From here, we divide carbon steel into 3 other types: low carbon steel; medium carbon steel; high carbon steel.
• Construction steel is a low carbon steel, with a carbon content of less than 0.22%. It is a soft, malleable, easy to weld steel. ready-made steel structure warehouse building Dubaiis good to use in other industries such as furniture making, sculpture, etc.
• Alloy steel in addition to iron (Fe) also has other components such as chromium (Cr), nickel (Nickel), manganese (Mn).
• Low alloy steel is steel with the ratio of the total minor elements below 2 ,5%. Thanks to those extra elements, alloy steel is very hard, durable, and resistant to rust. Alloy steel is good to use in construction. However, medium and high alloy steels are not good to use in construction.

  

We have two types: carbon steel and alloy steel.

Classification by method of steelmaking

Ready-made steel structure warehouse building Dubai is smelted from cast iron (Fe – C with content >1.7%). Steel making from cast iron is the process of reducing carbon and other impurities to bring about the required content for steel.

There are two main smelting methods as follows: by rotary kiln and by flat kiln.

Classification according to the degree of deoxidation

Liquid steel from the furnace is poured into molds and allowed to cool to recrystallize. Depending on the cold deposition process, we divide steel into the following types:

Boiling steel: During the cooling process, the steel gives off a lot of gas bubbles such as oxygen, carbon oxygen (as clear as boiling). It is these air bubbles that create inhomogeneities in the ready-made steel structure warehouse building Dubai. Leads to boiling steel susceptible to brittle failure and aging.

Static steel (silent steel):

Like its name suggests, static steel in the cold process will not evaporate like boiling steel because silicon, aluminum, and manganese have been added. These substances remove harmful oxygen and other non-metallic impurities that make up slag floating on the surface.

This slag is removed, the remaining steel becomes homogeneous, has good bearing capacity and is difficult to brittle failure.

Because of ready-made steel structure warehouse building Dubai superior quality, static steel is much more expensive than boiling steel, good to use in critical constructions or subjected to dynamic loads.

Semi-static (semi-quiet) steel

Semi-static steel is intermediate steel between the two types of boiling and static. The oxygen in semi-static steel is not completely reduced. Therefore, the quality and cost of semi-static steel is in the middle of the above two types of steel.

Structure and chemical composition of steel

Steel has a crystalline structure. Steel is observed through a microscope. We see two types of substances as follows:

1. Ferrite, 99% by volume. Ferrite is pure iron, soft and malleable.
2. Cementite is an iron carbide (Fe3C) compound, which is very hard and brittle.

Chemical composition of steel

Ready-made steel structure warehouse building Dubai consists of two main components, iron and carbon, and other minor components such as manganese – Mn, silicon – Si, sulfur – S, phosphorus – P.

• The effect of Manganese – Mn: increases the strength and toughness of steel, reduces the harmful effect of sulfur. Therefore, Manganese often add to liquid steel, especially in alloy steel.

  However, if the Mn content exceeds the threshold of 1.5%, the steel will become brittle.

• Silicon – Si is a deoxidizer, so it is also added to static steel. Silicon increases the strength of steel but reduces rust resistance and weldability. If metallurgy inready-made steel structure warehouse building Dubai, no more than 0.3% Silicon recommend for low carbon steel.

Some beneficial substances and harmful substances

• Phosphorus – P: reduces the ductility and impact toughness of steel, and at the same time makes the steel cold and brittle.
• Sulfur – S: makes steel hot brittle (brittle at high temperature) so it is easy to crack when welding and forging.
• The nitrogen – N, oxygen– O2 gases in the air, when mixed with the liquid metal and are not completely reduced, make the steel brittle and reduce the steel’s strength. Degassing require during the process to prevent the metal from being exposed to air (such as when welding).

In addition, ready-made steel structure warehouse building Dubai, people add metal elements such as copper (Cu), nickel (Nickel), chromium (Cr), titanium (Ti), vanadium (V), Molybdenum (Mo) to carbon steel. etc… increase the mechanical performance, increase the anti-rust durability of steel.

Steel grades good to use in construction

When choosing steel grades for projects, we will often pay attention to the following criteria:

1. Important properties of the project: bridges, factories, etc.
2. Working conditions of the structure: the work locates in a hot country; works located in the central region or prone to storms or high altitudes where it is cold all year round; …
3. Load characteristics.
4. Link method.

Ready-made steel structure warehouse building Dubai for bearing is Martin furnace steel or oxygen-blown rotary kiln, boiling, static and semi-static.