#blastfurnace

Category: Construction Insights

When engineers talk about TMT rods, they often focus on grade and size. But in reality, the steel-making route plays an equally critical role in how the rods perform over decades.

In India, the two most widely used production methods are the Blast Furnace route and the Induction Furnace route. Both can produce rods that meet IS 1786 specifications, but they differ in how they source raw materials, control impurities, and maintain strength consistency.

🏭 1. From Ore to Rod  Two Different Steel Paths

Blast Furnace (BF)  Large Integrated Steel Mills

Starts with iron ore, coke, and limestone.

Produces molten iron, refined in Basic Oxygen Furnace (BOF) or Electric Arc Furnace (EAF).

Converted into billets → rolled into TMT rods.

Examples: JSW Steel, Tata Steel, SAIL.

Strengths:

Uses virgin raw material with minimal scrap.

Excellent control over composition and impurities.

Very uniform mechanical properties batch after batch.

Induction Furnace (IF) – Secondary Steel Producers

Primarily melts scrap steel from dismantled plants, ships, and machinery.

Heated using electromagnetic induction.

May be refined in a Ladle Refining Furnace (LRF) for better chemical control.

Cast into billets → rolled into TMT rods.

Strengths:

Requires lower capital investment, enabling competitive pricing.

Flexible production suited to local market demand.

When paired with LRF refining, can closely match BF quality.

📊 2. Quick Feature Comparison

FeatureBlast Furnace SteelInduction Furnace SteelRaw MaterialVirgin iron oreScrap steelChemistry ControlExcellentModerate–High (with LRF)Impurity Risk (S & P)LowHigher without LRFConsistencyHighVariableDuctilityVery HighGood if refinedCorrosion ResistanceStrongModerate–HighPriceHigherLower

⚠️ 3. Risks with Low-Grade IF Steel

Without proper refining, Induction Furnace steel can carry:

High sulphur & phosphorus content → more brittle rods.

Mixed scrap contamination → unpredictable welding results.

Inconsistent quality due to poor chemistry control.

✅ 4. When Each Method Makes Sense

Choose Blast Furnace TMT for:

Mega infrastructure projects.

Coastal construction or seismic zones.

Long-lifespan bridges, flyovers, and towers.

Choose Induction Furnace TMT (with LRF) for:

Mid-rise and low-rise housing projects.

Cost-sensitive developments.

Local commercial structures.

🚀 5. How ATOFON Simplifies Your Steel Purchase

With ATOFON, you can:

Buyers: Post your steel requirements, specifying grade, ductility, and manufacturing route.

Sellers: Display your steel-making process to attract the right buyers for your product.

📍 Compare multiple suppliers, check certifications, and get delivery options all in one platform.

TL;DR:

Blast Furnace steel → Unmatched durability & consistency, ideal for critical projects.

Induction Furnace steel → Affordable and reliable if refined well.

Blast furnace trough cover castable

Through continuous innovation, we push the boundaries of refractory performance, delivering value to our customers worldwide.

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