3.2 Steel.ppt
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Transcript of 3.2 Steel.ppt
Steel Melting Shop (SMS)
By-RIYA
MONDALSMS-2 (QC)
What is steel ?
Steel is an alloy of IRON & CARBON, with Si, Mn, S, P in very small amount & where percentage of Carbon is less than 2.14%.
What is stainless steel ?
It is an high alloy steel which contain more than 10-12% Cr and often Ni, Mo, Cu, W, V as per Grade.
Types of stainless steel :
Ferritic stainless steelAustenitic stainless steelMartensitic stainless steelPrecipitation hardened stainless steelDuplex stainless steel
Grades of Stainless steel : 200 series: Austenitic, Cr-Ni-Mn alloy 300 series: Austenitic, Cr-Ni alloy 400 series: Ferritic & Martensitic, Cr alloy 600 series: Martensitic precipretation hardened alloy 2205 & 2507: Duplex stainless steel
Steel melting shop in viraj:
Departments:
Scrap Yard Raw Material Section Induction AOD CCM Billet Yard Quality
SMS Process line:
Scrap Yard:
Type of scrap:
1. Bundle Scrap2. Shredded Scrap3. Loose Scrap
Shredded Scrap are called quality Scrap as it required less time for melting.
According to their production:1. Home scrap or internal scrap: End cutting of billet, wire
rod, skull, turning from forging, fastener, end cutting of profile etc.
2. Obsolete scrap: automobile hulks, old farm equipment, and major home appliances.
3. Industrial Scrap: The automotive industry creates most industrial scrap.
Shredded Scrap
Scrap yard has a shredder machine which has capacity of around 50 Mt /Hr.
This machine can take scrap which has thickness not more than 4 mm.
Induction furnace:
Induction Heating
Working Principle of I/F: Induction furnace consist of an annular channel surrounding a
core of laminated iron sheets.
This core is surrounded by a primary coil and molten metal act as a secondary winding.
A low frequency AC power source is used to run the furnace and heat generation depends on the frequency of AC power supply.
Refractory lining: High Al₂O₃ which is called ramming mass.
Life of refractory lining: 80-100 heats. After that patching is done and again it run up to 60-70 heats.
Tap To Tap Time : Around 2 hour or 120 Min (avg).
Heat is tapped in to a ladle and transferred to AOD vessel.
Thank you
Ladle lining design: