2　Terms

2.1　Terms for Plate Mill and Hot-Rolled Wide Steel Strip Mill

2.1.1　Conventional Hot Strip Rolling Process

A production process in which slabs in regular thickness are used as the raw material，charged in cold state or hot state into a furnace and heated up or heated at the corners，and then continuously rolled into hot-rolled steel strip products.

2.1.2　Thin（Medium）Slab Continuous Casting and Rolling Process

A production process in which thin slabs in 50mm-100mm thickness or medium slabs in thickness equal to or greater than 100mm are directly charged into a soaking pit（heating）furnace，heated to some degree，and then rolled into hot-rolled steel strip products.

2.1.3　Steckel Mill Rolling Process

A production process in which slabs are used as the raw material，heated up，and rolled in a Steckel mill that serves as the main mill into hot-rolled steel strip products.

2.1.4　Semi-Endless Rolling Process

A production process in which thin slabs are used as the raw material，continuously rolled in a thin slab continuous casting and rolling line into weld-less slab in length equivalent to a multiple of regular length，and cut into hot-rolled steel strip products according to the coil weight requirement before a coiling machine.

2.1.5　Ferrite Rolling Process

A production process in which low carbon steel or ultra-low carbon steel is rolled in austenite state in the front stand of a roughing mill train or finishing mill train，and then the intermediate strip blank is rapidly cooled down to the ferrite temperature range to accomplish ferritic transformation，and then rolled in the rear stand of the roughing mill train or finishing mill train into a hot-rolled steel strip product.

2.1.6　Continuous Casting Hot-Charging Rolling Process

An energy-saving process in which slabs are charged in hot state at 400℃or above temperature into a heating furnace and are heated up.

2.1.7　Automatic Gauge Control（AGC）

A commonly used steel strip or plate gauge control technique，the main function of which is to improve the longitudinal thickness accuracy of steel strip or steel plate.

2.1.8　Automatic Width Control（AWC）

A commonly used steel strip or plate width control technique，the main function of which is to improve the width accuracy of steel strip or steel plate.

2.1.9　Short Stroke Control（SSC）

A technique for controlling the head width and tail width of steel strip or steel plate，to prevent the head width or tail width of the intermediate blank from being out of gauge；it belongs to automatic width control.

2.1.10　Plan View Rolling（PVR）

A technique for controlling the rectangularity of the finished steel plate in the rolling process.

2.1.11　Profile and Flatness Control（PFC）

A technique for controlling the shape and dimensions of the profile and the flatness of steel plate and steel strip in the rolling process.

2.1.12　Control Rolling（CR）

A rolling process in which the metal heating schedule，deformation schedule，and temperature schedule are controlled reasonably during hot rolling of steel plate or steel strip to ensure outstanding overall mechanical properties of the product.

2.1.13　Thermo Mechanical Control Process（TMCP）

A rolling process in which the slabs is rolled according to the specified rolling reduction within a specified temperature range during steel plate or steel strip rolling and deformation，to accomplish treatments such as solid solution strengthening，precipitation strengthening，dislocation strengthening，and grain refining，etc.，so as to afford optimal performance to the product.A thermo mechanical control process can be a two-stage rolling process or three-stage rolling process.

2.1.14　Accelerated Control Cooling（ACC）

Carry out cooling rapidly to some degree within the temperature range of phase transformation from austenite to ferrite after control rolling，so that the structure after phase transformation is more refined than the structure solely treated by control rolling and obtains higher strength.

2.1.15　Direct Quenching（DQ）

A process in which the quenching equipment is arranged after the finishing mill in the rolling line and quenching treatment is carried out utilizing the residual heat of the steel plate after rolling.

2.1.16　Automatic Jump Control（AJC）

A control method for controlling the position of the assistant roll of the coiling machine to reduce or eliminate indents on the head part of the steel strip when a thick steel strip is coiled.