cold rolled steel
Cold-rolled steel is steel produced by cold rolling. Cold rolling is a steel plate obtained by further rolling the No. 1 steel plate to a target thickness at room temperature. Compared with hot-rolled steel sheets, cold-rolled steel sheets have more accurate thickness, smooth and beautiful surface, and also have various superior mechanical properties, especially in terms of processing performance. Because cold-rolled raw coils are relatively brittle and hard, they are not suitable for processing, so usually cold-rolled steel sheets are required to be annealed, pickled and surface-leveled before being delivered to customers. The maximum thickness of cold rolling is below 0.1--8.0MM. For example, the thickness of cold-rolled steel sheets in most factories is below 4.5MM; the minimum thickness and width are determined according to the equipment capacity of each factory and market demand.
Introduction
The difference between cold-rolled steel and hot-rolled steel is not in the smelting process, but in the rolling temperature, or the termination temperature of rolling. The finish rolling temperature lower than the recrystallization temperature of the steel becomes cold rolled steel. Hot-rolled steel is easy to roll and has high rolling efficiency, but the steel is oxidized under hot-rolled conditions, and the surface of the product is black and gray. Cold-rolled steel requires high mill power and low rolling efficiency, and intermediate annealing is required to eliminate work hardening during the rolling process, so the cost is also high, but cold-rolled steel has a bright surface and good quality, and can be directly used for processing Finished products, so cold-rolled steel sheets are widely used.
processing method
The hot-rolled steel coil is used as the raw material, and the scale is removed by pickling, followed by continuous cold rolling. The finished product is hard rolled coil. Due to the cold hardening caused by continuous cold deformation, the strength and hardness of the hard rolled coil increase, and the ductility and plastic index decrease. , so the stamping performance will deteriorate and can only be used for parts with simple deformation. Hard-rolled coils can be used as raw materials for hot-dip galvanizing plants, because all hot-dip galvanizing units are equipped with annealing lines. The weight of hard-rolled coils is generally 6-13.5 tons, and the steel coils are continuously rolled at room temperature for hot-rolled pickled coils. The inner diameter is 610mm.
convex hull defect
Cold-rolled strip steel is a strip-shaped thin steel made by cold extrusion (without heating, otherwise called hot rolling). It is a material that rolls steel into the shape we want through cold water. It uses a machine to squeeze the unshaped material into a strip-shaped very thin steel by extrusion under very cold conditions, and then passes through various A form of processing, and then through cold treatment to make the coils we need, including coils, tapes, and wires. Cold-rolled steel coils also directly refer to cold-rolled strips as cold-rolled coils. In terms of steel processing, in terms of cold processing, there is a very serious problem with convex hull defects in cold-rolled steel coils.
According to foreign countries, the main hazard of steel coil uplift is that when the convex hull defect reaches a certain level, the steel coil will form a local wave shape after uncoiling, which will affect the user's use. For the research on the convex hull defects of cold-rolled steel coils, most of them believe that the cause of the convex hull defects is the local high point of the strip caused by the local wear of the work rolls of the hot-rolled finishing mill. local waves. Cold-rolled strip steel is widely used in various fields due to its good surface smoothness, smoothness, high stamping performance and dimensional accuracy, and its aging resistance, low yield point, and good stamping performance, such as Construction, machinery, home appliances and coating industries. Its various advantages make it widely used in various industries for a long time after its rapid rise.
Solucky steel Limited is a third-party supply chain service enterprise focusing on materials for automobiles, high-end household appliances, as well as material processing and storage. Its headquarters and warehouse base are set up in Shanghai BaoShan, and has branches all over the country, 20+ subsidiary companies,including Foshan, Guangdong, Chongqing, Wuxi, etcz.
Composition and Properties
| The material |
GMW3032 CR240IF |
| Chemical composition |
C% |
Mn% |
P% |
S% |
Al% |
Si% |
| |
≤0.01 |
≤1.60 |
≤0.10 |
≤0.025 |
≥0.010 |
≤0.30 |
| Mechanical property |
YS |
TS(MPa) |
EL(%) |
|
|
|
| |
240-300 |
≥360 |
≥32 |
|
|
|
Main products
Product Application
Machines & Processing
Packing & Delivery & logistics
Why Choose Us
FAQ
1.Where is your factory?
Our head office and warehouse located in Shanghai--the biggest steel making center of China
2.How long is your delivery time?
Generally it is 5-10 days if the goods are in stock. or it is 15-30 days if the goods are not in stock, it is according to quantity.
3.What about the MOQ?
MOQ only 200KG,include coils and sheets
4. How long is your lead time?
In general, our delivery time is within 7-15 days, and may be longer if the quantity is extremely large or special circumstances occur.
5.How's your product quality?
We only sell mid to high end steel materials,100% quality guarantee and cost-effective.
6.What are your terms of payment?
You can make the payment to our bank account,T/T, 30% deposit in advance, 70% balance against the copy of B/L.
7.How many countries you already exported to?
We have exported to America, Canada, Brazil, Chile, Colombia, Russia, Ukraine, Thailand, Myanmar, Vietnam, India, Kenya, Ghana,somalia and other African countries.Our export experience is rich, we familiar with different market demands, can help customers avoid a lot of trouble.
8.What are the certifications for your products?
We have ISO 9001, MTC, third parties' inspections are all available such SGS, BV ect.
Audited Supplier 
Solucky steel Limited is a third-party supply chain service enterprise focusing on materials for automobiles, high-end household appliances, as well as material processing and storage. Its headquarters and warehouse base are set up in Shanghai BaoShan, and has branches all over the country, 20+ subsidiary companies,including Foshan, Guangdong, Chongqing, Wuxi, etcz.
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