| 摘要 |
<p>A blank is made consisting of sheet, rod or wire, and is rapidly heated to produce austenite, followed by patenting in a lead bath. The prods. are next submitted to normal treatment operation used on steel to be cold worked. Heating and patenting are pref. used as a continuous operation, where the steel is heated to min. 850, and pref. to ca. 950 deg.C to form austenite in a total heating time of 1 minute, esp. in a tunnel furnace. The steel is then quenched for ca. 45 seconds in a Pb bath at 500-550 deg.C., and is next pref. pickled and coated with phosphate or copper before cold working. Research work has shown that a spheroidising anneal is not essential for steel which is to be cold worked. Such annealing treatments require long furnace times and a large consumption of energy, which is avoided by the invention.</p> |
