Vacuum or other controlled atmosphere metallurgical melting and casting furnaces and related equipment as follows: a. Arc remelt and casting furnaces having both of the following characteristics: 1. Consumable electrode capacities between 1 000 cm 3 and 20 000 cm 3 ; and 2. Capable of operating with melting temperatures above 1 973 K (1 700 °C); b. Electron beam melting furnaces and plasma atomization and melting furnaces, having both of the following characteristics: 1. A power of 50 kW or greater; and 2. Capable of operating with melting temperatures above 1 473 K (1 200 °C). c. Computer control and monitoring systems specially configured for any of the furnaces specified in 2B227.a. or b.

Furnaces capable of operation at temperatures above 400 °C as follows: a. Oxidation furnaces b. Controlled atmosphere heat treatment furnaces Note: This item does not cover tunnel kilns with roller or car conveyance, tunnel kilns with conveyor belt, pusher type kilns or shuttle kilns, specially designed for the production of glass, tableware ceramics or structural ceramics.

Thermal treatment furnaces — Temperature > 850 °C and one dimension > 1 m,

Controlled atmosphere heat treatment furnaces or oxidation furnaces capable of operation at temperatures above 400 °C. Note : This item does not cover tunnel kilns with roller or car conveyance, tunnel kilns with conveyor belt, pusher type kilns or shuttle kilns, specially designed for the production of glass, tableware ceramics or structural ceramics.

Thermal treatment furnaces — Temperature > 850 °C and one dimension > 1 m,

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