---
title: Bosh
description: "Bosh: The critical melting zone of a blast furnace, engineered for extreme heat and material flow."
---

[Glossary ](https://www.o2oh.com/glossary)

# [Bosh](https://www.o2oh.com/glossary/bosh)

 Written by [one to ONE Holdings](https://www.o2oh.com/glossary/author/one-to-one-holdings) | Jan 19, 2026 4:36:25 AM

The bosh is the conical section of a [blast furnace](https://www.o2oh.com/glossary/bosh), positioned above the tuyeres and below the belly.

It is the hottest zone, where iron and [slag](https://www.o2oh.com/glossary/slag) finish melting as they descend. The bosh must withstand extreme thermal loads and chemical erosion, requiring intensive cooling and high-grade [refractory](https://www.o2oh.com/glossary/refractories) lining.

[View full post](https://www.o2oh.com/glossary/bosh)

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