Abstract
A new direct patenting method characterized in coiling hot rolled wire rods in a aqueous solution bath held at its boiling temperature has been developed. The unique idea originated from the discovery of the fact that the cooling rate of wire rod during a film boiling stage when quenching in hot water is comparable to that of conventional patenting.
The remarkable features are as follows:
1) The apparatus is so compact as it can be set up in an existing rod rolling mill without any trouble.
2) The operation is very simple and the running cot is quite small.
3) The cooling ability is so high as the tensile strength level of the wire rod processed by the present method is between that by lead-patenting and that by air-patenting, and large diameter rods up to 14#mm are available.
4) The variation in the mechanical properties is sufficiently small as for general purposes except for high grade applications.
