sentence: Parts are made from ingots different ways.
sentences_before: A metal starts as a block, called an ingot. Metallurgists must know how to make a metal part from an ingot.
sentences_after: When a big hammer is used, it is called forging. To make thin metals, a metal is put between two rolls and moved, called rolling.
concept_name: part
headings: Metallurgy Making metal parts
categories: Technology