Home Education Steel:10 Important Things You Must Know As A Material In 2020

Steel:10 Important Things You Must Know As A Material In 2020

Everyone knows about this material but here in this blog, I will explain to you in detail by sharing my knowledge regarding it which will help you when you are using or purchasing it.

Steel is essentially an alloy of iron and carbon in which carbon content is not more than 1.5% and it is completely in the combined form.

The topic is elaborate in details as below

  1. Introduction
  2. Different Things Made From Steel In The Construction Sector
  3. Various Steel Products
  4. How Steel Is Made?
  5. Types Of Bars
  6. Properties Of Steel
  7. Different Grade
  8. Famous Steel Plants In India
  9. Importance Of Use Of Reinforcement Steel In Construction
  10. FAQ

Introduction

It creates an intervening platform between cast iron and wrought iron with 0.25 to 1.5% carbon content

Cast iron can take compressive stress and wrought iron can take tensile stress but it is suitable for all construction purposes in general. It is strong equally in both tension and compression.

Types  % Carbon Content  
(1) Mild steel (M.S.)
(2) Medium carbon steel
(3) High carbon steel  
0.10 to 0.25
0.25 to 0.60
0.60 to 1.10  

Different Things Made From Steel In The Construction Sector

  • Angle sections (i) equal legs (ii) unequal legs
  • Channel sections
  • Corrugated sheets
  • Expanded metal
  • Flat bars
  • I-sections (Rolled joints/beams)
  • Plates (thickness varies from 5 to 50 mm.)
  • Tor steel bars (size varies from 6 to S0 mm.)
  • Round bars (diameters from 5 to 250 mm.)
  • Square bars (cross-section with sides from 5-250 mm.)
  • T-sections
various steel sections

Various Steel Products

Uses of Steel  To make  
(1) Mild typeMotor body, sheet metal, tin plates, etc.  
(2) Medium carbon typeBoilerplates, rails, tires, hammers, large stamping and pressing dies, etc.  
(3) High carbon type (Hard steel)  Sledge hammers, springs, stamping dies, drills, smith’s tools, stone mason’s tools, chisels, hammers, saws, wood working tools, axes, cutlery, knives, punches, etc.  

How Steel Is Made?

Iron ore is heated and melted in a furnace where impurities are removed and carbon is added.There are two processes:

  1. Blast furnace
  2. Electric arc Furnace

Blast Furnace Method

Blast furnace was invented by Henry Bessemer in mid of 1850. Even today it is made by this process in which air is blown through molten pig iron to oxidize the material and separate impurities.

blast furnace method of steel

Firstly iron ore, limestone, and coke are added to the furnace from top and started sinking to the bottom which is called stack and where temperature getting hotter as it moves to the bottom of furnaces. The gases created removed from the upper half. In the bottom half where limestone starts reacting with impurities in iron core and coke forming the slag where the temperature reaches 3000 degrees Celsius. Molten iron formed is removed from the bottom and slag is major factors carrying other materials that float top of the molten iron from the slag notch provided at a height above the molten iron notch.

Types Of Bars

  1. Main bars
  2. Distribution bars
  3. Bent up bars
  4. Corner
  5. Tie up bars

The bars are of two types as per material

(i) Mild bars (ii) Tor bars

They are available in two types of section

(i) Circular (ii) Square

Circular mild type bars are popularly used in RCC work of buildings. Nowadays pale green-colored powder-coated type bars are in demand, for corrosion resistance and long life of bonding with concrete.

Properties Of Steel

properties of steel

Different Grades

To RCC, mainly three grades of it are used

  • Fe 250 (Mild )

Characteristic strength, fy = 250 N/mm2

Mild bars are denoted by symbol ‘Ф’.

  • Fe 415 (Tor ) or High Yield Strength Deformed bars = HYSD bars.

Characteristic strength, fy = 415 N/mm2.

Tor bars are denoted by symbol ‘Ф’.

  • TMT bars: TMT = Thermo Mechanically Treated bars

The yield strength of the bar is increased without losing its yielding property.

In addition, the bond strength is also increased due to this treatment.TMT bars have excessive power blended with excessive elongation. This increases the ductility and weldability of the bars.

Due to higher ductility and toughness, TMT bars are used in earthquake-prone areas. These bars have better corrosion resistance. These bars are available in grades Fe 400, Fe 500, and Fe 550.

Types of reinforcements available in the market are shown in Table:

TypeConforming to I.S. CodeYield stress/0.2% Proof stress
Mild (Plain bars)  IS: 432 – 1966  250 N/mm2
High yield strength Deformed bars (HYSD  IS 1786 1979  415 N/mm2
500 N/mm2
Hard drawn steel wire fabric  IS 1566 1967  480 N/mm2
Thermo mechanically Treated bars (TMT)  _400 N/mm2
500 N/mm2
550 N/mm2  

The characteristic strength of this material is its tensile strength determined on standard specimen below which not more than 5% specimen gives the results. However, code permits the use of minimum yield stress or 0.5% proof stress as a characteristic strength of it.

The reinforcing bars are generally available in the market in the following sizes.

Mild (plain bars)  6, 10, 12, 16, 20, 25, 32 mm  
Deformed bars  8, 10, 12, 16, 20, 22, 25, 28, 32 mm  
TMT bars  8, 10, 12, 16, 20, 25 mm  
steeel plants blast furnace method

Famous Steel Plants In India

Following are the list of famous of famous companies and plants in India:

Steel Plant NameOwned ByArea
TISCOTATAJamshedpur
Durgapur PlantSAILDurgapur
Jindal Steel and PowerJindal GroupRaigarh
Bokaro PlantSAILBokaro
Visvesvaraya Iron and Steel PlantSAILBhadravathi
Bhilai PlantSAILChhattisgarh
IISCOSAILAsansol
Visakhapatnam PlantRashtriya Ispat Nigam LimitedVisakhapatnam
Essar PlantEssar Steel LimitedHazira
Vijayanagar PlantJSW LimitedHospet
Salem PlantSAILSalem
Rourkela PlantSAILRourkela
Bhushan PlantBhushan SteelDhenkanal

Source: bizvibe.com

Importance Of Use Of Reinforcement Steel In Concrete

steel used in bridges

The importance of reinforcement in concrete can be stated as follows

(1) It has very good tensile strength while concrete is very poor. Therefore, it is used in the tension zone.

For mild , Fe 250, fy = 250 N/mm2

For Tor , Fe 415, fy = 415 N/mm2

Generally for concrete, Flexural strength = tensile strength = fcr

fcr =0.7 √fck  N/mm2

(IS: 456 200, P. 16, cl. 6.2.2)

For M 20 grade concrete,

fcr = 0.7 √20

     = 3.13 N/mm2

(2) As the temperature coefficients of this material and concrete are nearly equal, temperature stresses are reduced when it is used in concrete.

(3) The concrete shrinks on the setting. It provides a proper bond between this material and concrete.

(4) The modulus of elasticity of it is very high.

Es = 2×105N/mm2.

steel used in industrial shed

If you also want to more about timber the complete guide is provided here.

FAQ

1) Will steel rust?

Yes, whenever it is in direct contact with oxygen and moisture for a long period as iron in it reacts with oxygen which results in iron oxide which is rust.

2) Why steel is stronger than iron?

Due to the presence of various alloys materials such as carbon, sulfur, manganese, etc.

3) Which steel is used in construction?

Generally mild types (Fe 250) is used as it is durable and strong.

4) Which steel is the strongest?

In terms of metal, Tungsten is the strongest and in terms of alloy Steel is the strongest

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