The straight coil belongs to the hot rolling coil, which uses the continuous casting slab or the primary rolling slab as the raw material, is heated by the step-by-step heating furnace, enters the roughing mill after the high-pressure water descaling, and the roughing mill enters the finishing mill after the cutting head, tail and then, implements the computer-controlled rolling. After the final rolling, the straight coil is formed by the laminar cooling (the computer controls the cooling rate) and coiler coiling. The head and tail of the straight hair curl are usually in the shape of tongue and fish tail, and the accuracy of thickness and width is poor. The coil is heavy and its inner diameter is 760mm. (generally, the industry likes to use it. ）Hot rolled products are widely used in shipbuilding, automobile, bridge, construction, machinery, pressure vessel and other manufacturing industries because of their high strength, good toughness, easy processing and good weldability. Hot rolling steel plate products include steel strip (roll) and steel plate with its shear. The steel strip (roll) can be divided into straight hair roll and finishing roll (divided roll, flat roll and longitudinal cut roll). Knowledge of rolling hard coil rolling hard coil: continuous rolling of hot-rolled pickling coil at normal temperature. Features: because it has not been annealed, its hardness is very high (HRB is greater than 90), and its machining performance is very poor, so it can only carry out simple bending processing with directivity less than 90 degrees (perpendicular to coiling direction). Application scope: (1) after annealing, it is processed into common cold rolling; (2) galvanizing unit with annealing pretreatment device is used to process galvanizing; (3) panel which basically does not need to be processed.
Definition of medium and thick plate: the thickness of steel plate is greater than or equal to 5.0mm. It includes common carbon plate, excellent carbon plate, low alloy plate, ship plate, bridge plate, boiler plate, vessel plate, etc. Application: used in construction, machinery, shipbuilding, bridges, boilers, pressure vessels and other industries.
The hot-rolled steel coil is used as raw material, the oxide skin is removed by acid pickling and then cold continuous rolling is carried out. The finished product is hard rolled coil. Due to the cold work hardening caused by continuous cold deformation, the strength, hardness and toughness plastic index of hard rolled coil increase, so the stamping performance will deteriorate and can only be used for simple deformed parts. The hard rolled coil can be used as the raw material of the hot-dip galvanizing plant, because the hot-dip galvanizing units are equipped with annealing lines. The weight of hard rolled coil is generally 20-40 tons, and the hot-rolled pickling coil is continuously rolled under normal temperature. The inner diameter is 610mm. Because of its high hardness (HRB greater than 90) and poor machining performance without annealing treatment, it can only carry out simple bending with directivity less than 90 degrees (perpendicular to coiling direction). To put it simply, cold rolling is based on the hot-rolled strip. Generally speaking, it is a process of hot rolling - Pickling - cold rolling. Cold rolling is made of hot-rolled plate at room temperature. Although in the process of rolling, the plate will also heat up, it is still called cold rolling. As a result of continuous cold rolling after hot rolling, the mechanical properties of cold rolling are relatively poor and the hardness is too high. The mechanical properties can only be restored after annealing. The one without annealing is called hard roll. The hard roll is generally used to make products without bending and stretching, and the lucky two sides or four sides with thickness less than 1.0 are bent.
Tangshan Jingjin cold rolling galvanizing Co., Ltd. is the first choice for pickling strip
直發卷屬熱軋卷 熱軋卷是用連鑄板坯或初軋板坯作原料，經步進式加熱爐加熱，高壓水除鱗后進入粗軋機，粗軋料經切頭、尾、再進入精軋機，實施計算機控制軋制，終軋后即經過層流冷卻(計算機控制冷卻速率)和卷取機卷取、成為直發卷。直發卷的頭、尾往往呈舌狀及魚尾狀，厚度、寬度精度較差，邊部常存在浪形、折邊、塔形等缺陷。其卷重較重、鋼卷內徑為760mm。(一般制管行業喜歡使用。) 熱軋產品具有強度高、韌性好、易于加工成型及良好的可焊接性等優良性能，因而被廣泛用于船舶、汽車、橋梁、建筑、機械、壓力容器等制造行業。 熱連軋鋼板產品包括鋼帶（卷）及有其剪切而成的鋼板。而鋼帶（卷）可以分為直發卷及精整卷（分卷、平整卷及縱切卷）。軋硬卷知識軋硬卷：在常溫下，對熱軋酸洗卷進行連續軋制。 特點：因為沒有經過退火處理，其硬度很高（HRB大于90），機械加工性能差，只能進行簡單的有方向性的小于90度的折彎加工（垂直于卷取方向）。 應用范圍： （1）退火后加工成普通冷軋； （2）有退火前處理裝置的鍍鋅機組加工鍍鋅； （3）基本不需要加工的面板。
中厚板定義：鋼板厚度大于等于5.0mm。 分普碳板、優碳板、低合金板、船板、橋梁板、鍋爐板、容器板等。 用途：應用于建筑、機械、造船、橋梁、鍋爐、壓力容器等行業。
軋硬卷 唐山軋硬卷 鍍鋅帶鋼 酸洗帶鋼就選唐山京津冷軋鍍鋅有限公司