What is the correct sequence of technological operations for thermal treatment of carbon steel (austenization is done in air environment)?

Question

What is the correct sequence of technological operations  for thermal treatment of carbon steel (austenization is done in air environment)?

Accepted Answer

Machining, austenitizing, quenching, tempering, grinding and painting

Answer

Austenitization, quenching into water, machining (e.g. turning), tempering, polishing, painting

Answer

Machining, grinding, austenitizing, quenching, tempering, painting

Answer

Machining, grinding, painting, austenitizing, quenching, tempering

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