Iron and Steel Industry – Process and Location Factors
Geography › Economic Activities and Industrial Location · Topic 20.7
The iron and steel industry is the basic industry on which machinery, transport and construction depend. In the traditional route, iron ore, coking coal and limestone are heated in a blast furnace to make pig iron, which is refined into steel in a basic oxygen or electric furnace. A newer route reduces ore with gas or coal to sponge iron and melts it in electric arc furnaces. Plants locate near raw materials, water, markets or ports.
5 min read · UPSC Prelims · Geography · Economic Activities and Industrial Location
At a Glance
- Raw materials Iron ore, coking coal, limestone, manganese, water
- Furnace Blast furnace makes pig iron
- Steelmaking Basic oxygen furnace or electric arc furnace
- New route Direct reduced iron
- India Second largest crude steel producer
- Exam link UPSC Prelims, Geography: Economic Activities and Industrial Location
Where Does It Fit?
This is the seventh topic of the macro on economic activities and industrial location. The previous topic explained the general factors of location, and this one applies them to the basic industry of steel. The last topic of the macro covers where the steel industry is located. Previous topic: Factors Influencing Industrial Location. Next topic: Distribution of the Iron and Steel Industry.
How Is Iron and Steel Made?
In short: iron ore is smelted with coke and limestone to make iron, and the iron is refined to make steel.
- Preparation: iron ore is crushed, and fine ore is made into sinter or pellets. Coking coal is baked in ovens without air to make coke, which is both fuel and chemical reducing agent.
- Smelting in a blast furnace: ore, coke and limestone are fed from the top, and hot air is blown from the bottom. Coke burns and makes carbon monoxide, which removes oxygen from the ore, and the limestone combines with the impurities to form slag. The molten iron collecting at the base is pig iron, which has about 4 per cent carbon.
- Steelmaking: pig iron is converted into steel by lowering the carbon content to below about 2 per cent and adding alloying metals such as manganese, chromium or nickel to give the desired properties, as in Manganese and Chromite. The main furnaces are the basic oxygen furnace, which blows oxygen into molten iron and scrap, and the electric arc furnace, which melts scrap or sponge iron with electricity.
- Casting and rolling: molten steel is cast into slabs, blooms or billets and rolled into plates, sheets, rails, bars and wires.
| Route | Inputs | Notes |
|---|---|---|
| Blast furnace – basic oxygen furnace | Iron ore, coking coal, limestone | The traditional integrated route; large plants; high carbon emissions, about two tonnes of carbon dioxide per tonne of steel |
| Direct reduced iron (sponge iron) – electric arc furnace | Iron ore pellets, natural gas or non-coking coal, electricity | Does not need coking coal; smaller plants; India is the largest producer of sponge iron; lower emissions if green hydrogen and clean power are used |
| Scrap – electric arc furnace | Steel scrap, electricity | Recycling; lowest emissions; depends on scrap supply |
What Factors Decide the Location of Steel Plants?
- Raw materials: about 1.6 tonnes of iron ore, 0.7 to 0.8 tonnes of coking coal and half a tonne of limestone are needed for one tonne of pig iron, so the industry is a weight-losing one and is located near the ore or coal, or at a place that is easy to reach from both, as in Iron Ore – Types and Distribution and Coal – Formation, Classification and Distribution.
- Limestone, dolomite and manganese: as flux and alloy, from nearby deposits, as in Limestone, Dolomite and Magnesite.
- Water: a very large amount for cooling and processing, so plants are on rivers or the coast.
- Transport: railways to bring the ore and coal, and ports for imports of ore or coal and exports; modern plants on the coast use imported coking coal, as at Visakhapatnam.
- Power and labour: reliable electricity and skilled labour.
- Markets: as scrap and product movement matter, a market near the plant reduces the costs, and electric arc furnaces locate near the market.
- Capital and policy: steel needs huge capital, and government policy has supported it through public sector plants and, now, private investment under the National Steel Policy of 2017, which aims at 300 million tonnes of capacity by 2030, as in Factors Influencing Industrial Location.
Steel is under pressure for decarbonisation. The European Union’s carbon border adjustment mechanism, which enters its definitive phase in 2026 and covers steel, would charge importers for embedded emissions, affecting Indian exports. India has launched a green steel taxonomy and a national green hydrogen mission, and producers are considering hydrogen-based reduction and more electric furnaces. India also uses temporary safeguard duties against cheap steel imports. As an analytical point, steel is both a driver of growth, as infrastructure and construction use most of it, and a major source of emissions, about a tenth of India’s carbon dioxide, so the question is how to expand output while making it cleaner.
Why Is This Topic Important?
- Process Steps and inputs asked
- Location Weight-losing logic
- Climate Green steel and CBAM
What Came Next?
The last topic of the macro describes the distribution of the iron and steel industry in the world and India. Next topic: Distribution of the Iron and Steel Industry.
Key People and Terms
- Blast furnace Furnace smelting ore with coke
- Pig iron Crude iron from the blast furnace
- Coke Baked coal used as fuel and reductant
- Slag Waste from flux and impurities
- DRI Direct reduced iron
- EAF Electric arc furnace
Exam Corner
Points to Remember
- Inputs: iron ore, coking coal, limestone.
- Pig iron has about 4 per cent carbon.
- Limestone makes slag.
- DRI avoids coking coal.
- India’s steel target: 300 million tonnes by 2030.
Do Not Confuse With
- Pig iron and steel High-carbon crude iron versus refined low-carbon steel
- Blast furnace and electric arc furnace Ore smelting versus scrap or sponge melting
- Coke and coking coal Baked product versus raw coal
Memory Hook
Ore, coke and lime into the furnace; iron out the bottom, slag floats, oxygen makes steel.
Mains Angle
Questions ask for process and location. These points add depth.
- Process Smelting and refining
- Location Weight-losing industry
- Shift Decarbonisation
A Question You May Face
An original practice question, not a past paper question.
“Describe the process of iron and steel making and explain the factors responsible for the location of steel plants. How can the industry be decarbonised?”
How to Answer
- Process Blast furnace to rolling.
- Routes BOF, DRI-EAF, scrap.
- Location Raw materials, water, transport.
- Climate Green steel, CBAM.
GS Relevance
Frequently Asked Questions
How is steel made from iron ore?
Iron ore is smelted in a blast furnace with coke and limestone to produce molten pig iron, which contains a large amount of carbon. The pig iron is then refined in a steelmaking furnace, in which oxygen or electric heat reduces the carbon and other impurities, and alloy metals are added to give the required properties.
What are the raw materials of the iron and steel industry?
The main raw materials are iron ore, coking coal and limestone, with manganese and other alloy metals, dolomite and a large quantity of water. About 1.6 tonnes of iron ore, 0.7 to 0.8 tonnes of coking coal and half a tonne of limestone are needed to produce one tonne of pig iron.
Why is the steel industry located near sources of raw materials?
The steel industry uses large quantities of heavy raw materials that lose weight in processing, so it is cheaper to carry the finished steel than the ore and coal. As a result, integrated steel plants are located near iron ore and coal fields, or at points reachable by rail or sea from both.
What is sponge iron or direct reduced iron?
Sponge iron or direct reduced iron is produced by removing the oxygen from iron ore pellets using natural gas or non-coking coal, without melting the ore. It is then melted in electric arc furnaces to make steel. This route does not need coking coal, so it suits countries like India, which has limited coking coal.
What is the National Steel Policy 2017?
The National Steel Policy 2017 sets a target to raise India's crude steel capacity to 300 million tonnes and per capita steel consumption to 160 kilograms by 2030–31. It promotes domestic steel production, the use of domestic raw materials, investment, and the export of high-quality products.
PYQ Practice — Statement Analysis
1 Limestone acts as a flux in the blast furnace.
It forms slag with impurities.
2 Pig iron has a lower carbon content than steel.
Pig iron has more carbon.
3 Sponge iron is produced without melting the ore.
It is a direct reduction process.
4 The steel industry is a weight-gaining industry.
It uses weight-losing raw materials.
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