Iron and Steel Making (MSE 421) Lecture 1

Course Structure

• Total Lectures: 34 lectures (50 mins each)
  • 16-17 on Iron Making
  • 16-17 on Steel Making
• Problem-Solving Sessions: 5-6 sessions
  • Material Balance
  • Thermodynamics
  • Kinetics
  • Wrist Diagram-Based Problems
• Total Contact Time: 40 hours

Importance of Iron and Steel

• Steel: Essential engineering material
  • Found in everyday items (utensils, vehicles, furniture)
  • Integral to modern society
• Iron: Raw material for making steel
  • Intermediate product refined into steel

Overview of Global Steel Industry

• Global Production (2019): ~1.87 billion metric tons
  • India: 111 million metric tons
  • Asia: ~1.34 billion metric tons (China, Japan, India)
• Economic Implications: Each ton of steel costs ~INR 50,000
  • India is the second-largest producer behind China
• Per Capita Steel Consumption: Indicator of a nation's prosperity
  • Advanced Countries: 200-300 kg per person
  • India: ~80 kg per person
  • Goal: 160-170 kg per person by 2050

Historical Perspective

• Modern Steel Making: Began around 1850 with the Bessemer process
  • 1850: Start of Commercial modern steel making
  • Significant Milestones:
    • 1870: 0.5 million metric tons
    • 1880: 1 million metric tons
    • 1890: 28 million metric tons
    • 1980: 650 million metric tons
    • 2019: 1.87 billion metric tons

Importance of Iron Ore

• Predominantly exists as Hematite (Fe2O3) and Magnetite (Fe3O4)
• Strong Iron-Oxygen bond challenges early extraction
• Primitive Techniques: Solid-state reduction using carbon, producing wrought iron
  • Iron yield was limited to 350 kg/day historically
  • Modern blast furnaces: ~13,000-15,000 tons/day

Evolution of Steel Industry

• Pre-1850s: Primitive methods; wrought iron production
• Post-1850s: Industrial advances, larger scales of production
• Modern Furnaces: Blast furnaces up to 35 meters high, producing iron on a massive scale

Indian Steel Industry

• Historical Development: India's rich heritage in high-quality steel production
  • Example: Iron Pillar of Delhi, Damascus swords from wootz steel
• Post-Independence: Structured growth
  • 1947: 1 million metric tons
  • 1985: 10 million metric tons
  • 2019: 111 million metric tons
  • 2013 Projection: 300 million metric tons by 2030
• Major Producers: Public and private sectors
  • Public: Steel Authority of India Limited (SAIL), Rashtriya Ispat Nigam Limited (RINL), National Mineral Development Corporation (NMDC)
  • Private: Tata Steel, Jindal (JSW)

Types of Steel Production

• Integrated Steel Mills: Use blast furnaces to produce liquid iron
  • Dominant in public sector
• Electric Arc Furnace (EAF): Specializes in high-performance steel using scrap
  • Dominant in secondary steel sector
• Induction Furnace (IF): Melts scrap to produce carbon steel
  • Over 3000 units in India
  • Lower capital expenditure
• Statistics:
  • Integrated Steel Mills: 70 million metric tons
  • EAF-based Plants: 30 million metric tons
  • Induction Furnaces: 10 million metric tons

Economic and Environmental Concerns

• Financial Scale: Large-scale mills produce millions of tons/year
• Recycling: Steel is highly recyclable; old structures can be repurposed
• Environmental Impact: Addressing pollution and waste (slag)
  • Slag and gases: Need for effective recycling and use

Summary and Next Steps

• Importance: Iron and steel making is critical for metallurgists
• Goal: Study the subject scientifically to improve quality and efficiency
• Future Classes: Focus on specific aspects of iron making in the next 16 lectures.