The Development of Continuous Casting【连铸】——中英文对照

发布日期:[10-04-01 19:25:14] 浏览人次:[]

Continuous Casting

From the Making, Shaping and Treating of Steel by William,McGraw—Hill Companies, Inc., 2002

The Development of Continuous Casting

Continuous casting was developed very rapidly after the Second World War. Steel-producers arc today generally convinced that continuous casting is at least as economical as ingot production and can match the quality of the latter across much of the production spectrum for high-quality steels. Continual development of the technique aimed at improved steel characteristics is leading to increasing adoption of the process in works producing special high-grade steels. The reasons for continuous-casting systems are:

(1) lower investment outlay compared with that for a blooming train (mini-steelworks);

(2) about 10% more productivity than with conventional ingot-casting;

(3) high degree of consistency of steel composition along the whole length of the strand; better core quality, especially with flat strands; high inherent surface quality, leading to savings on an otherwise expensive surfacing process;

(4) high degree of automation;

(5) friendlier to the environment;

(6) better working conditions.

Types of Installation

The first continuous-casting plants were aligned vertically; however, with larger cross-sections, increasing strand-length, and, above all, with increasing pouring-rates this type of construction leads to unreasonable building-heights. These factors also lead to a considerable increase in the length of the liquid phase which has metallurgical effects. The length of the liquid phase in a continuously-cast strand is determined by the following formula:

L=D2/4x2Vc

Where D =strand thickness (mm)

x = solidification characteristic (mm / min1/2)

These values amount to 26~33 for the whole cooling length.

Vc = casting rate (m /min)

Efforts to reduce building-height first led to continuous-casting systems in which molten metal passed into a vertical mould and solidified completely before being bent or where the strand has been in the liquid phase and later to the bow-type installation which has a curved mould and is the system most used today. Vertical systems and those in which the strand is bent when completely solidified have long straight liquid phases and can lead to unacceptably high capital outlay.

However, these systems have metallurgical advantages from the point of view of maintenance. A vertical system in which the strand is bent while still in the liquid phase has the advantage that the building need not be as tall as when the strand is bent after solidification; however, the liquid-phase bending system requires higher initial outlay and greater maintenance costs. The bow-type system represents a compromise between the costs of capital outlay and of maintenance and what can be achieved metallurgic ally.

Continuous-casting is suitable for the production of almost any cross-section imaginable; square, rectangular, polygonal, round, and oval sections are

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