1. Integrated iron and steel plants: raw materials
- Integrated plant: all stages at one site — coke ovens, blast furnace, steel melting shop, rolling mills.
- Raw materials: iron ore (mainly hematite); coking coal (coke: fuel and reducing agent); limestone and dolomite (flux, removes impurities as slag); manganese (hardens steel); refractories (fire clay, quartzite); water; power.
- Illustrative needs per tonne of steel: iron ore 1.6 t, coking coal 0.8 t, limestone and dolomite 0.3 t, manganese ore 0.02 t — about 2.7 t of solids.
- By-product: slag, used to make cement.
| Input | Role |
|---|---|
| Iron ore | Iron |
| Coke | Fuel, reducing agent |
| Limestone | Flux |
| Manganese | Hardens steel |
Key terms
- Integrated steel plant
A plant that carries out every stage of steel making, from raw materials to rolled steel, at one site.
- Flux
A substance such as limestone that combines with impurities in the furnace to form slag.
- Coke
A hard fuel made by heating coking coal without air; it melts and reduces iron ore.
2. Location of iron and steel plants
- Raw materials are heavy and bulky and lose weight in smelting, so plants are built where raw materials can be assembled most cheaply.
- Near coalfields (Damodar valley), near iron-ore fields (Odisha, Chhattisgarh), between the two (two-way rail traffic, Jamshedpur), or at ports (imported coking coal, exports — Visakhapatnam).
- Also needed: water, railways, labour, market, capital.
- Tonne-kilometres = tonnes carried × distance; the lower the total, the cheaper the site.
| Location type | Example |
|---|---|
| Between coal and ore | Jamshedpur |
| On the ore field | Rourkela |
| At a port | Visakhapatnam |
Key terms
- Tonne-kilometre
A unit of transport work: one tonne carried one kilometre.
3. Tata Steel, Rourkela and Visakhapatnam
| Head | Tata Steel, Jamshedpur | Rourkela | Visakhapatnam |
|---|---|---|---|
| State | Jharkhand | Odisha (Sundargarh) | Andhra Pradesh |
| Ownership | Private; founded 1907 | Public (SAIL); German help; 1959 | Public (RINL, as of the early 2020s); early 1990s |
| Iron ore | Noamundi, Joda | Barsua, Kalta, Keonjhar | Bailadila (Chhattisgarh) |
| Coking coal | Jharia, West Bokaro | Jharia, Talcher | Mostly imported via the port |
| Other | Subarnarekha and Kharkai rivers; Kolkata port | Limestone and dolomite from Purnapani and Birmitrapur; Mandira dam; Hirakud power | First shore-based integrated plant; exports by sea |
| Plant | Ownership |
|---|---|
| Jamshedpur | Private |
| Rourkela | Public (SAIL) |
| Visakhapatnam | Public (RINL) |
Key terms
- SAIL
Steel Authority of India Limited, the public sector company that runs Rourkela and other steel plants.
- RINL
Rashtriya Ispat Nigam Limited, the public sector company that runs the Visakhapatnam Steel Plant.
4. Petrochemical industry
- Petrochemicals: chemicals from crude oil and natural gas; refineries and crackers make ethylene, propylene and benzene, which become polymers and other compounds.
- Products: plastics (polyethylene, PVC), synthetic fibres (polyester, nylon, acrylic), synthetic rubber, detergents, paints, solvents, dyes, raw materials for fertilisers and medicines.
- Centres: Jamnagar, Vadodara (Koyali), Hazira, Dahej (Gujarat — leading region as of the early 2020s); Mumbai (Trombay), Thane–Belapur; Haldia; Panipat; Mangaluru; Chennai (Manali); Kochi; Barauni; Bongaigaon; Paradip.
- Relevance: cheap, light, durable substitutes for wood, metal, glass and natural fibres; uses in farming, health, clothing, transport; jobs and exports.
- Concern: plastics are not biodegradable — recycle and reduce.
| Product | Use |
|---|---|
| Polyethylene | Packaging, pipes |
| Polyester | Clothing |
| Synthetic rubber | Tyres |
| Detergents | Cleaning |
Key terms
- Petrochemicals
Chemicals and products made from crude oil and natural gas.
- Cracker
A plant that breaks oil fractions or gas into small molecules such as ethylene.
- Polymer
A long-chain molecule made by joining many small units, such as polyethylene.
5. Electronics industry
- Products: mobile phones, computers, TVs, telecom, medical and defence equipment, satellites, components.
- Relevance: communication, banking, education, health, governance; defence and space; linked to IT and software; skilled jobs; exports.
- Footloose industry: little raw material; needs skills, research, capital and infrastructure.
- Centres (as of the early 2020s): Bengaluru (electronic capital: Electronics City, BEL, ITI, HAL, ISRO), Hyderabad, Chennai–Sriperumbudur, Noida–Greater Noida, Pune, Mumbai, Gurugram, Kolkata (Salt Lake), Thiruvananthapuram (Technopark), Gandhinagar, Mohali.
- Why Bengaluru: early public sector units; institutes and engineering colleges; moderate, dust-free climate; Electronics City, technology parks, airport, state support; private investment and start-ups.
| Factor | Bengaluru example |
|---|---|
| Public sector base | BEL, ITI, HAL, ISRO |
| Skills | IISc, engineering colleges |
| Climate | Moderate, dust-free |
| Policy | Electronics City |
Key terms
- Footloose industry
An industry that is not tied to raw materials and can locate wherever skills, markets and infrastructure are good.
- Electronic capital of India
A name for Bengaluru, the leading electronics centre.
Exam tips
Common mistakes
- Calling limestone a fuel (it is a flux).
- Saying Tata Steel is in the public sector.
- Forgetting that Visakhapatnam imports much of its coking coal.
- Listing natural products such as cotton as petrochemicals.
How marks are usually awarded
- Steel plants: state, ownership, raw materials with sources, special advantage (1 mark per correct point).
- Location: factor plus how it reduces cost.
- Petrochemicals and electronics: named products or centres, and factors with explanation.