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Inclusion types, major
sources, effect in
steel making
Subhradip kumbhakar , swarnava das, swapnil mondal
• Inclusion:
 Any separate undesirable foreign materials Present in the
steel is known as inclusion.
Non metallic inclusion:
There are Chemical compounds of metal ( Fe, Mn, Si, Al etc)
With non metals(C, N,O,S, H) .
The term cleanliness of steel is used to refer relative freedom from the entrapment of non-
metallic inclusion in the solid steel.
• Types of non- metallic inclusion:
On the basis of source:
1.Endigenous inclusion
2.exogenous inclusion
On the basis of chemistry:
1.sulphides inclusion
2.Nitrides inclusion
3.Oxides inclusion
4.Carbides inclusion
Indigenous inclusion:
Indigenous inclusion are those inclusion Which is generated during the steel
making process like de-oxidation, de-sulphurisation etc.
Example: reaction between Al and O2 Produce Al2O3, reaction between S and Mn
produce MnS.
Exogenous inclusion:
Exogenous inclusion are those inclusion which is arise from
chemical and mechanical erosion of refractory and other material
oxide formation due to O2 pick up from atmosphere and
entrapment Of slag particles in steel.
Oxide inclusion: Fe2O3, FeO, MnS, Al2O3
etc.
Sulphides inclusion: FeS, MnS, CaS etc.
Carbides inclusion: Fe3C, Mn3C etc.
Nitrides inclusion : TiN, AlN etc.
Harmful effects Of inclusion on steel:
1 . Presence of Non- metallic inclusion Reduces the ductility , roughness
And formability of steel.
2.Non – metallic inclusion reduces the surface quality of steel.
3. NMI Reduces corrosion resistance Of steel.
4.NMI Makes steel brittle.
5.During the casting Of liquid steel , NMI Causes nozzle clogging
Thus create problem During casting.
Morphologies of Non-Metallic Inclusions
 Globular Shape Inclusions :- MnS and silicates inclusions are globular. Globular
shape incusions are less harmful for steel properties
~
 Dendritic Shape :- Alumina is a dendrite shape inclusion . If large amount of
Al is used for deoxidation causes dendrite type Al2O3 inclusion.
 Sharp edges and corners of the dendrites shaped inclusions causes local
concentration of stress which decreases the ductility , toughness and fatigue
strength.
Methods for removal of inclusions from
Steel:
1. Carryover Of slag from LD converter Or EAF During tapping Should be
minimized because slag Contains large amount Of Feo, mno, , Sio2 etc
Which Could revert back into steel.
2. Argon Stirring through bottom , is beneficial for inclusion removal
Because it causes faster growth and floatation Of de-oxidation Products
( inclusion).
3. Very high Ar gas flow rate are Undesirable for inclusion Removal
Because it causes:
a. re-entrainment of slag into molten steel
b. Increase erosion Of refractory and generate exogenous inclusion .
c. More O2 Pick up from atmosphere.
Characteristics of non- metallic
inclusion:
Non- metallic inclusion in steel are characterized by the size , shape and
Distribution of inclusion :
Effect of size of inclusion :
a. Micro inclusion : (size 1- 100 micro-meter)
b. Macro inclusion: ( size grater than 100 micro-meter)
Micro inclusion Generally indigenous inclusion and macro inclusion is a
Exogenous inclusion.
Effect of distribution of inclusion:
If micro inclusion distributed Uniformly through out the steel , it is beneficial for
steel , it increase strength.
THANK YOU

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Jishu (1).pptx

  • 1. Inclusion types, major sources, effect in steel making Subhradip kumbhakar , swarnava das, swapnil mondal
  • 2. • Inclusion:  Any separate undesirable foreign materials Present in the steel is known as inclusion. Non metallic inclusion: There are Chemical compounds of metal ( Fe, Mn, Si, Al etc) With non metals(C, N,O,S, H) . The term cleanliness of steel is used to refer relative freedom from the entrapment of non- metallic inclusion in the solid steel.
  • 3. • Types of non- metallic inclusion: On the basis of source: 1.Endigenous inclusion 2.exogenous inclusion On the basis of chemistry: 1.sulphides inclusion 2.Nitrides inclusion 3.Oxides inclusion 4.Carbides inclusion
  • 4. Indigenous inclusion: Indigenous inclusion are those inclusion Which is generated during the steel making process like de-oxidation, de-sulphurisation etc. Example: reaction between Al and O2 Produce Al2O3, reaction between S and Mn produce MnS. Exogenous inclusion: Exogenous inclusion are those inclusion which is arise from chemical and mechanical erosion of refractory and other material oxide formation due to O2 pick up from atmosphere and entrapment Of slag particles in steel.
  • 5. Oxide inclusion: Fe2O3, FeO, MnS, Al2O3 etc. Sulphides inclusion: FeS, MnS, CaS etc. Carbides inclusion: Fe3C, Mn3C etc. Nitrides inclusion : TiN, AlN etc.
  • 6. Harmful effects Of inclusion on steel: 1 . Presence of Non- metallic inclusion Reduces the ductility , roughness And formability of steel. 2.Non – metallic inclusion reduces the surface quality of steel. 3. NMI Reduces corrosion resistance Of steel. 4.NMI Makes steel brittle. 5.During the casting Of liquid steel , NMI Causes nozzle clogging Thus create problem During casting.
  • 7. Morphologies of Non-Metallic Inclusions  Globular Shape Inclusions :- MnS and silicates inclusions are globular. Globular shape incusions are less harmful for steel properties
  • 8. ~  Dendritic Shape :- Alumina is a dendrite shape inclusion . If large amount of Al is used for deoxidation causes dendrite type Al2O3 inclusion.  Sharp edges and corners of the dendrites shaped inclusions causes local concentration of stress which decreases the ductility , toughness and fatigue strength.
  • 9. Methods for removal of inclusions from Steel: 1. Carryover Of slag from LD converter Or EAF During tapping Should be minimized because slag Contains large amount Of Feo, mno, , Sio2 etc Which Could revert back into steel. 2. Argon Stirring through bottom , is beneficial for inclusion removal Because it causes faster growth and floatation Of de-oxidation Products ( inclusion). 3. Very high Ar gas flow rate are Undesirable for inclusion Removal Because it causes: a. re-entrainment of slag into molten steel b. Increase erosion Of refractory and generate exogenous inclusion . c. More O2 Pick up from atmosphere.
  • 10. Characteristics of non- metallic inclusion: Non- metallic inclusion in steel are characterized by the size , shape and Distribution of inclusion : Effect of size of inclusion : a. Micro inclusion : (size 1- 100 micro-meter) b. Macro inclusion: ( size grater than 100 micro-meter) Micro inclusion Generally indigenous inclusion and macro inclusion is a Exogenous inclusion. Effect of distribution of inclusion: If micro inclusion distributed Uniformly through out the steel , it is beneficial for steel , it increase strength.

Editor's Notes

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