Pear-shaped steel vessel and autoclave: what they have in common

1. Step 1. Pear-shaped steel vessel — is part of — Bessemer converter. A steel vessel with a refractory lining.
2. Step 2. Bessemer converter — evolved into — Open-hearth furnace. A more controllable process.
3. Step 3. Open-hearth furnace — is part of — Steel works. A steelmaking shop.
4. Step 4. Steel works — has part — Rolling mill. Rolling mills.
5. Step 5. Rolling mill — uses — Pressure. Squeezing with rolls.
6. Step 6. Pressure — is used in — Autoclave. Steam under pressure.

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