Cold-rolled coils use hot-rolled coils as raw materials. During cold rolling, the rolled pieces are rolled below the recrystallization temperature. Generally, steel rolled pieces are rolled at room temperature. Silicon steel sheets with high silicon content have high brittleness and low plasticity and need to be preheated to 200°C before cold rolling. Since no heating is performed during the production process of cold-rolled coils, there are no defects such as pitting and 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 usage requirements, such as electromagnetic properties, deep drawing properties, etc. Cold-rolled coils are widely used in automobile manufacturing, electrical products, rolling stock, aviation, precision instruments, food cans, etc. General specifications: thickness 0.15-3mm, width 550-1530mm, coil outer diameter Φ1000-2500mm, coil inner diameter Φ410-610mm. Maximum weight: 45 tons.
Production Process
Cold-rolled coils use hot-rolled coils as raw materials, and their production process usually goes through the main processes of raw material preparation, cold rolling, heat treatment, smoothing and finishing.
Product performance
The difference between rolls and flat sheets is a cut package. Chilled coils are obtained by pickling and cold rolling hot rolled coils. It can be said to be a type of cold rolled coil. Cold-rolled coils (annealed state): Hot-rolled coils are obtained by pickling, cold rolling, bell annealing, flattening, and (finishing).
There are three main points of difference between the two:
1. In appearance, the general cold hard coiled plate is slightly black.
2. The surface quality, structure, and dimensional accuracy of cold-rolled plates are better than those of chilled coils.
3. In terms of performance, because the cold-hardened coils obtained directly from the hot-rolled coils through the cold-rolling process undergo work hardening during cold rolling, the yield strength increases and some internal stress remains, which makes the coil appear "hard" externally. It is called cold hard coil plate.
Therefore, the yield strength: the chilled coil is greater than the cold-rolled coil (annealed state), making the cold-rolled coil (annealed state) more conducive to stamping forming. Generally, the default delivery state of cold-rolled coils is annealed.
Uses of cold rolled coils:
Cold-rolled coils have good properties, that is, through cold rolling, cold-rolled strips and steel plates with thinner thickness and higher precision can be obtained, with high flatness, high surface finish, clean and bright surface of cold-rolled plates, and easy coating There are many types of processing, varieties, and wide uses. It also has the characteristics of high stamping performance, no aging, and low yield point. Therefore, cold-rolled plates have a wide range of uses and are mainly used in automobiles, printed iron barrels, construction, building materials, bicycles and other industries. It is also the best choice for producing organically coated steel plates.
Zhengde Cold rolled steel coil is made from hot-rolled steel coil as raw material, which is subjected to acid washing to remove oxide skin and then subjected to cold continuous rolling. The finished product is rolled hard coil. Due to the cold work hardening caused by continuous cold deformation, the strength and hardness of the rolled hard coil increase, and the toughness and plasticity index decrease. Deep processing requires annealing treatment.
Due to the lack of heating during the production process of cold rolled steel coils, there are no defects such as pits and oxide scales that often occur during hot rolling. The surface quality is good and the smoothness is high. Moreover, the dimensional accuracy of cold rolled steel coils is high, and the performance and structure of the products can meet some special usage requirements, such as electromagnetic performance, deep drawing performance, etc.
| Technical Standards for cold rolled steel coil |
| grade |
Zhengde enterprise standard |
Comparable to foreign standards |
illustrate |
| Standard |
Grade |
Standard |
Grade |
| general use |
Q/BQB403 Q/BQB402 |
St12 SPCC |
DIN1623JISG3141 |
St12 SPCC |
For general forming processing such as refrigerators and other home appliance shells, oil barrels, and steel furniture. |
| stamping grade |
Q/BQB403 Q/BQB402 |
St13 SPCD |
DIN1623JISG3141 |
St13 SPCD |
Steel for stamping and forming processes such as automobiles, home appliances, and construction. |
| Deep drawing |
Q/BQB403 Q/BQB402 |
St14, (F, HF, ZF)SPCE (F, HF, ZF) |
DIN1623JISG3141 |
St13 SPCE |
Automobile headlights, fuel tanks, car doors, windows and other steels for deep drawing and forming. |
| Steel for extra deep drawing |
Q/BQB403 |
St15 St14T |
|
|
Car headlights, complex underbody panels, oil pans. |
| hard steel |
Q/BQB402 |
SPCC4D SPCC8D SPCC1D |
JISG3141 |
1/4 hard1/8hard |
Steel for bicycle rims and steel for stationery. |
| structural steel |
Q/BQB410 BZJ410 |
St37-2G St44-3G St52-3G |
DIN1623 |
St37-2G St44-3G St52-3G |
Buildings, car bodies, brackets. |
| Atmospheric resistant steel |
BZJ441 |
B440NQ B450NQ B460NQ B500NQ |
|
|
Automobile, train car outer panels, container panels, doors and windows, cold-formed steel and other components. |
| Steel for TV |
Q/BQB470 |
SPCCK, St12CK SPCCCE SECCCD St50CB BCK-1 |
|
|
Color picture tube shadow mask frame, color picture tube earrings, color picture tube explosion-proof plate with galvanized steel strip, color picture tube explosion-proof steel, color picture tube frame. |
| steel for car wheels |
BZJ412 |
B320LW B360LW |
|
|
Steel for automotive wheel rims. |
Our Advantages
High precision
Compared to hot-rolled steel plates, cold-rolled steel coils have more precise thickness, smooth and beautiful surfaces, and also possess various superior mechanical properties, especially in terms of processing performance. Due to the brittleness and hardness of the cold rolled coil, it is not suitable for processing. Therefore, in general, cold rolled steel plates require annealing, pickling, and surface leveling before being handed over to the customer.
Extensive use
Cold rolled steel coil, with a smooth surface and excellent processing, is used in household appliances such as automobiles, refrigerators, washing machines, as well as industrial equipment and various building materials. With the development of the economy, cold rolled steel plates have become a necessary material in modern society. Among them, cold rolled hard coils can be used as raw materials for hot dip galvanizing plants, as hot dip galvanizing units are equipped with annealing lines. The weight of the rolled hard coil is generally between 8-23 tons.
Strict craftsmanship
Cold rolled steel coils generally use hot-rolled strip steel with a thickness of 1.5-6 mm as the cold rolled billet. The main processes include pickling, cold rolling, degreasing, annealing, leveling, and shearing (cross cutting, longitudinal cutting). If producing coated plates, there are also plating or coating processes such as electroplating tin, hot tin coating, and hot zinc coating. The production process of cold rolled billets is as follows: hot rolled sheet coils (raw materials) - acid washing - cold rolling - degreasing - annealing - leveling - shearing - finished product delivery.
Provide deep processing
The company's slitting machine, slitting line, cuts cold rolled steel coils into strips of various widths as needed, and then folds the strips into small coils for use in the next process. It is a necessary equipment for precision cutting of transformers, motor industries, and other metal strips. It is mainly used for strip cutting of materials such as tinplate, galvanized iron, silicon steel sheet, cold rolled strip, stainless steel strip, aluminum strip, steel strip, and other coils.
Quality first: production and inspection in strict accordance with production standards;
Price advantage: discounts based on real market prices;
Transaction security: There will be no loss of customer funds;
After-sales guarantee: the customer's problem is our problem;
Long-term cooperation: quality assurance, price advantage, sincere service can last for a long time.
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Packaging & Shipping
Company Profile
Shandong Zhengde Metal Manufacturing Co., Ltd. is a production and sales company integrating hot-rolled steel coils, cold-rolled steel coils, galvanized steel coils, color-coated steel coils, section steel, steel pipes, steel wires, metal mesh, stainless steel, aluminum, copper and other metal products integrated large enterprises. Five production and sales bases have been formed in Binzhou, Liaocheng, Wuxi, Tianjin, Jinan and Tai'an, with more than 100 production lines, 4 nationally recognized laboratories, 2 technical engineering centers, and 5 enterprise technology centers. Products are exported to more than 50 countries and regions such as North America, South America, Europe, Africa, Oceania, Middle East, and Southeast Asia.
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