Who are they and what do they do? The metal refiner improves the properties (hardness, tensile strength, elasticity) of metal products (rod, wire, pipes, sheet etc.) using heat and other treatments. Related jobs may be that of the metal hardener and galvaniser.
What are the activities of the job? This is done using various technologies (quenching, cementing, coating, galvanising). S/he services and maintains the machines and equipment used.
Where is it done and under what conditions? In heavy duty steel mills. The environment can be dirty, and noisy with exposure to chemicals and heat.
What tools/equipment do they use? Various machines and equipment, ovens, furnaces, various chemical baths.
What do you need to succeed? You need an apprenticeship and ability to react quickly.