|
发表于 2007-5-19 09:37:28
|
显示全部楼层
Please see follow:0 X( Y& b! i9 F- ^( l; B5 B! a
The hot-rolling process has gradually become a much more closely controlled operation, and is being increasingly applied to low alloy steels with compositions carefully chosen to provide optimum mechanical properties when the hot deformation is complete. This process, in which the various stages of rolling are temperature-controlled, the amount of reduction in each pass is predetermined and the finishing temperature is precisely defined, is called controlled rolling and is now of greatest importance in obtaining reliable mechanical properties in steels for pipelines, bridges, and many other engineering applications. |
|