Type classification and use of cold rolled coil

Cold-rolled coils are made of hot-rolled coils, which are rolled at room temperature below the recrystallization temperature, including plates and coils. Many domestic steel mills such as Baosteel, Wuhan Iron and Steel, and Anshan Iron and Steel can produce them. Among them, those delivered in sheets are called steel plates, also called box plates or flat plates; those delivered in rolls are called steel strips, also called coil plates. The definition of cold rolling is rolling under recrystallization, but it is generally understood as rolling using normal temperature rolling materials. Aluminum cold rolling is divided into plate rolling and foil rolling. Those with a thickness of 0.15~ or more are called plates, and those with a thickness of 0.15~ or less are called plates. It is called foil. Europe and the United States mostly use 3~6 continuous rolling mills as cold rolling equipment in the production process. Since there is no heating during the production process, there are no defects such as pitting and iron oxide scale that often occur in hot rolling, and the surface quality is good and the finish is high. . Moreover, the dimensional accuracy of cold-rolled products is high, and the performance and structure of the products can meet some special requirements for use, such as electromagnetic properties and deep drawing properties.

Specifications: thickness 0.2-4mm, width 600-2 000mm, steel plate length 1 200-6 000mm.

Grade: Q195A-Q235A, Q195AF-Q235AF, Q295A(B)-Q345 A(B); SPCC, SPCD, SPCE, ST12-15; DC01-06

Performance: Low carbon steel grades are mainly used, which require good cold bending and welding performance, as well as certain stamping performance.

Application fields: Cold-rolled strips are widely used, such as automobile manufacturing, electrical products, rolling stock, aviation, precision instruments, food cans, etc.

Cold-rolled thin steel plate is the abbreviation of ordinary carbon structural steel cold-rolled plate, also known as cold-rolled plate, commonly known as cold-rolled plate, sometimes mistakenly written as cold-rolled plate. The cold plate is a hot-rolled strip of ordinary carbon structural steel, which is further cold-rolled into a steel plate with a thickness of less than 4mm. Due to rolling at room temperature, no iron oxide scale is produced. Therefore, the cold plate has good surface quality and high dimensional accuracy. Coupled with annealing treatment, its mechanical properties and process properties are superior to hot-rolled thin steel plates. In many fields, especially In the field of home appliance manufacturing, it has gradually replaced hot-rolled steel sheets.
Cold Rolled Coil
Applicable grades: Q195, Q215, Q235, Q275; SPCC (Japanese grade); ST12 (German grade)

symbol:

1. Q—the code name of the yield point (limit) of ordinary carbon structural steel, which is the upper and lower case of the first Chinese pinyin letter of “Qu”; 195, 215, 235, 255, 275—indicate their yield point (limit) respectively ) value, unit: MPa (N/mm2); because the comprehensive mechanical properties of Q235 steel, such as strength, plasticity, toughness and weldability, are the best among ordinary carbon structural steels, it can better meet the general use requirements, so the scope of application is very wide.

2. S-steel (Steel), P-plate (Plate), C-cold rolling (cold), the fourth place C-common grade (common).

3. ST-steel (Steel), 12-common grade cold-rolled thin steel plate

Cold-rolled steel plate: steel grade—technical condition standard

Marking example: B-0.57501500-GB708-88; steel plate, standard number Q/BQB402, brand SPCC, heat treatment state annealed + smooth (S), surface center processing state is pockmarked D, surface quality is FB grade trimming (cutting Edge EC, uncut edge EM) steel plate, thickness 0.5mm, B-level accuracy, width 1000mm, A-level accuracy, length 2000mm, A-level accuracy, roughness accuracy PF.A, then marked as: steel plate ECQ/BQB 402- SPCC-SD-FB/(0.51000A2000A-PF.A);

Cold rolled steel plate: Q225-GB912-89

Cold-rolled ordinary thin steel plate: It is cold-rolled from ordinary carbon structural steel or low-alloy structural steel. The surface quality of cold rolled sheet is better. Has good stamping performance. It is required to ensure that the cold bending and cup tests are qualified, and it is often used in industries such as automobiles and raw materials for coated sheets.

Cold-rolled high-quality thin steel plate: mainly includes various high-quality steel cold-rolled thin plates, the most commonly used is carbon structural steel plate, especially cold-rolled thin steel plate for deep drawing, which is cold-rolled thin plate made of low-carbon high-quality steel 08Al. The quality is divided into three groups; Ⅰ, Ⅱ, Ⅲ, which represent special high-grade, high-grade, and higher finishing surfaces, respectively, and are divided into ZF, HF, and F grades according to the drawing level (representing the most complicated and very high-end surface for punching and drawing). Complicated and complicated parts), according to the allowable deviation of steel plate thickness, it is divided into two levels of accuracy, A and B, and is widely used in the automobile and tractor industry.

Cold-rolled steel plate with smooth surface and excellent processing, used for home appliances such as automobiles, refrigerators, washing machines, industrial equipment, and various building materials. With the development of the economy, cold-rolled steel sheets have been called necessary materials in modern society. Classification of cold-rolled products: hot-rolled pickling, hard-rolled coil, ordinary cold-rolled, galvanized (electro-galvanized, anti-fingerprint, hot-dip galvanized), galvanized, electro-tinned, color-coated, electrical steel (silicon steel sheet), etc. .

1. Hot-rolled pickling:

2. Rolled hard coils: Continuous rolling of hot-rolled pickled coils at room temperature.

Product features: Because it has not been annealed, its hardness is very high (HRB is greater than 90), and its machinability is extremely poor. It can only perform simple directional bending less than 90 degrees (perpendicular to the coiling direction). Types of cold-rolled products (1) processed into ordinary cold-rolled products after annealing;

(2) The galvanizing unit with pre-annealing treatment device processes galvanizing;

(3) Panels that basically do not require processing.

Commonly used steel grades are CDCM - SPCC (SPCD, SPCE, ST12, ST13, ST14, BLC, BLD, BUSD, BUFD, BSUFD, etc.), but their properties are basically the same.

3. Ordinary cold rolling;

4. Galvanized;

5. Aluminum-zinc plating: 55% aluminum, 43.4% zinc and 1.6% silicon are plated on the surface of the steel plate by continuous molten coating process.

Features:

(1) It has good durability and has a longer life than galvanized steel;

(2) It has good heat resistance and is less likely to change color at high temperatures than galvanized steel sheets;

(3) Has good heat reflectivity;

(4) It has a gorgeous silver-white surface;

(5) It has processing performance and spraying performance similar to that of galvanized steel sheet;

(6) It has good welding performance.

Scope of application: industries that use galvanized sheets with high requirements.

6. Electroplated tin (tinplate): It is processed by Frothstein's insoluble anode electroplated tin process.

7. Color coating;

8. Electrical steel (silicon steel sheet).

Cold-rolled sheet product use, technical indicators, performance and specifications

Cold-rolled sheet has good performance, that is, through cold-rolling, cold-rolled strip and steel sheet with thinner thickness and higher precision can be obtained, with high flatness, high surface finish, clean and bright surface of cold-rolled sheet, and easy for coating Processing, many varieties, wide application, high stamping performance, no aging, low yield point, so cold-rolled sheet has a wide range of uses, mainly used in automobiles, printed iron drums, construction, building materials, bicycles and other industries. At the same time, it is also the best choice for the production of organic coated steel sheets. For wholesale prices of cold-rolled coils in Huaian, you can contact our professional steel sales company.、