Cold Rolled Coil

Gnee Steel (Tianjin) Co., Ltd. is one of the most professional cold rolled coil manufacturers and suppliers in China. Welcome to wholesale customized cold rolled coil at competitive price from our factory. Good service and quality products are available.

 

GNEE STEEL COMPANY:

GNEE STEEL can provide you with the best cold rolled steel coils.
GNEE STEEL is a specialist in cold rolled steel coils.

 

Cold-rolled coils are often used in the steel industry. Different from hot-rolled coils, they refer to steel strips that are directly rolled into a certain thickness with a roll at room temperature and rolled into a whole coil with a coiler. Compared with hot-rolled coils, cold-rolled coils have a brighter surface and higher finish, but will generate more internal stress.

Since there is no heating in the production process, there are no defects such as pitting and iron oxide scale that often occur in hot rolling. Moreover, the dimensional accuracy of cold rolled steel coil products is higher than that of hot-rolled coils, and the performance of the products can better meet some special application requirements.

Item Name	Cold Rolled Steel Coil
Thickness	0.2-3.0mm
Width	600-1500mm
Hardness	50-71 (CQ Grade)
Hardness	45-55 (DQ Grade)
Yield Strength	<270 (CQ Grade)
	<240 (DQ Grade)
Tensile Strength	240-410 (CQ Grade)
	240-370 (DQ Grade)
Elongation Percentage	28
	34

Commonly used steel grades:

DC01 (tensile strength 270 – 410 MPa)– This grade can be used for simple forming work such as using bending, embossing, crimping, and stretching.

DC02/DC03 – These grades are suitable for forming requirements such as deep drawing and difficult profiles.

DC04 – This quality can meet high deformation requirements.

DC05/06/07 – These deep drawing quality grades are suitable for higher forming and deformation requirements. Below are their mechanical properties.

Steel Code	Yield Strength	Tensile Strength	Elongation A80mm	Plastic Strain Ratio r90	Strain Hardening Exponent n90
DC01	140-280 MPa	270-410	≥28
DC02	140-240 MPa	270-370 MPa	≥34	≥1.4
DC03	120-210 MPa	270-350 MPa	≥38	≥1.8	≥0.18
DC04	120-180 MPa	270-350 MPa	≥40	≥2.0	≥0.20

 

SPCC, SPCD, SPCE Materials

Steel Code	Yield Strength Relb	Tensile Strength	Plastic strain ratio r90e	Strain hardening exponent n90d
SPCC	130-300 MPa	270-410 MPa
SPCD	120-240 MPa	270-370 MPa	≥1.3
SPCE	120-210 MPa	270-350 MPa	≥1.8	≥0.18

 

Cold Rolling Process for Steel Coil：

Cold rolling: Using hot-rolled steel coils as raw materials, oxidizing the hides and removing the scales and then performing tandem cold rolling. The finished products are rolled hard rolls. The cold work hardening due to continuous cold deformation makes the strength, hardness, and toughness of the rolled hard rolls rise. The plastic index drops, so the stamping performance will deteriorate, and it can only be used for simple deformed parts. Rolled hard coils can be used as raw materials for hot dip galvanizing plants because hot dip galvanizing units are all provided with annealing lines. The weight of the rolled hard coil is generally 6~13.5 tons. The coil is continuously rolled at room temperature under the normal temperature. The inner diameter is 610mm.

 

Cold Rolled Coil Product features:

Because it has not been annealed, its hardness is very high (HRB is greater than 90), and its machining performance is extremely poor. It can only perform simple directional bending processing (with a direction perpendicular to the take-up direction) of less than 90 degrees.

 

Quality Control:

 

Application:

 

Difference between Hot-Rolled Steel And Cold-Rolled Steel:

Category	Hot Rolled Steel	Cold Rolled Steel
Product Features	The original colour is a mixture of blue and black and it's a bit oily.	There is a combination of white spots with grey colour and a bit of glossy.
Aesthetics	These types of steel are shaggy with no sharp edges.	These types of steel are not shaggy and have an aesthetic touch with a beautiful and smooth surface.
Features	At high temperatures, hot-rolled can change features, shapes and sizes	The features remain unchanged while the shape changes.
How to preserve	Without the protective packaging outside, hot-rolled steel can be easily preserved.	To remove all the rust, exterior storage and packaging are needed
Application	Includes art and architecture, automotive engine and parts and agriculture and mining equipment.	From the manufacturing industry to construction, home appliances and more.

 

Cold rolled steel coil product packaging and transportation:

 

About GNEE STEEL:

GNEE STEEL's business includes color-coated sheets, cold-rolled sheets, galvanized sheets, color-coated corrugated sheets, and galvanized corrugated sheets. It can be customized according to customer requirements to provide customers with high-quality and low-price products.

The factory covers an area of more than 2,500 acres. It passed the ISO 9001 quality management system certification in 2001 and the ISO 14001 environmental management system certification in 2010.

With excellent product quality and excellent service, we not only sell well in the domestic market, but also export to more than 200 countries including Russia, Canada, India, Brazil and Southeast Asia. Enjoying a high reputation in the international market.

Welcome to visit our company!

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