An open furnace or forge, in which blooms are heated before being wrought into bars.
Webster 1828 Edition
Chafery
CHAFERY
,
Noun.
In Iron works, a forge in which an ancony or square mass of iron, hammered into a bar in the middle, with its ends rough, is reduced to a complete bar, by hammering down the ends to the shape of the middle.
1957: The open hearths of finery and chafery are surmounted each by a huge chimney. — H.R. Schubert, History of the British Iron and Steel Industry, p. 224.