Yijin Industry Co. , Ltd is an enterprise specializing in the production, sales and import and export of metal materials. The company's products include steel, Stainless steel,aluminum alloy, copper alloy, nickel-based alloy and other metal materials, which are widely used in aerospace, automobile, construction, electronics, machinery and other fields.
Our company has advanced production equipment and a professional technical team to ensure the high quality and stability of products. At the same time, the company also pays attention to environmental protection and sustainable development, adopts environmental protection technology in the production process, and strictly abides by national and international environmental protection regulations.
Why Choose Us
Rich Experience
Adhering to the business philosophy of "quality first, reputation first", Yijin is committed to providing high-quality metal materials and high-quality services to global customers.
Professional Team
The company has a complete after-sales service system and a professional technical support team, which can respond to customer problems and needs in a timely manner, provide customers with beneficial technical guidance and solutions, and enhance customer loyalty and satisfaction.
High Quality
The company continuously strives to promote the construction of products and brands, actively carries out publicity activities, and establishes a good corporate image and brand image. At the same time, the company also pays attention to improving product quality. Through continuous improvement of technology and process, the competitiveness of products and market share have been improved.
Quality Control
We have established long-term and stable cooperative relations with many well-known domestic and foreign steel mills, aluminum factories and other metal material manufacturers, and has a stable supply capacity of a large number of high-quality raw materials, reducing procurement costs. It can also provide customers with better product quality assurance.
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EN 10130 DC04 Cold Rolled High Drawing Steel Coil
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- Chemical composition: The chemical composition of DC01 steel is as follows:. - Carbon (C)
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Cold-rolled steel is produced in cold reduction mills where the material is cooled at near room temperature, followed by annealing and/or tempers rolling. This process produces steel that has a wide range of surface finishes and is superior in tolerance, concentricity, and straightness compared to hot-rolled steel. Cold-rolled steel contains a low carbon content, and an annealing method makes them softer than hot-rolled sheet. Cold-rolled steel products are commonly produced in sheets, strips, bars and rods.
Cold-rolled steel sheets and strips are available in full-hard, half-hard, quarter-hard and skin-rolled conditions.
Benefits of Cold-Rolled Steel
Increased Strength
Cold-rolled steel is significantly stronger than hot-rolled steel. As the rollers compress the steel at room temperature, the steel becomes stronger due to strain hardening. Just how strong is cold-rolled steel exactly? Although there are exceptions, cold-rolled steel is typically about 20% stronger than its hot-rolled counterpart.
Improved Surface Finish
In addition to being stronger, cold-rolled steel has an improved surface finish. It’s smoother and has fewer surface imperfections than hot-rolled steel. Not only does this improve the aesthetics of cold-rolled steel; it makes cold-rolled steel a more suitable material for certain applications, such as the construction of bridges.
Tighter Tolerances
Cold rolling allows for tighter tolerances than hot rolling. What does this mean exactly? In metalworking, the term “tolerance” refers to the overall thickness of metal. Cold-rolled steel is typically thinner — Without sacrificing strength — Than hot-rolled steel. As a result, cold rolling offers tighter tolerances than aren’t found in other steelmaking processes.
Multiple Options
There are several different options available for creating cold-rolled steel, some of which include full-hard, half-hard, quarter-hard and skin-rolled. Of all those options, full-hard cold rolling is often preferred because it offers the tightest tolerances. When performed correctly, full-hard cold rolling can reduce the thickness of steel by up to 50%. Other cold rolling processes can also reduce the thickness of steel, but they aren’t as effective as full-hard cold rolling.
Types Of Cold Rolled Steel
Low Carbon Steel
This type of steel is preferred for its ductility and low cost. It is used in the manufacturing of appliances, automotive parts, construction materials, and roofing.
Medium Carbon Steel
This grade of steel is used in the construction of hardware, tools, and agricultural implements. It is also used in the production of pipes and tubes.
Alloy Steel
This type of steel is made up of varying elements like manganese, silicon, and copper. It is very versatile and is used in manufacturing screws, bolts, and automobile parts.
Stainless Steel
This type of steel is resistant to rust and corrosion and is used in the manufacturing of kitchen equipment, surgical instruments, and automotive parts.
Drawing Quality Steel
It is used to produce products that require deep drawing, like automobile parts, and appliances.
Extra Deep Drawing Quality Steel
This type of steel is used in the manufacturing of steel containers, tank bodies, and pressure vessels.
Construction
Construction and development are two vital industrial buildings where cold-rolled steel types are used in huge quantities. This high usage of construction materials is due to the importance of steel in making a structure resistant to diverse environmental conditions. Cold-rolled steels are also used for framing in the construction industry. You will often see this in commercial buildings as the main structural component. The strength of cold-formed steel elements is superior to that of other metal frame materials while being lighter than those materials.
Home Appliances
Cold-rolled steel has a variety of uses, including its widespread usage in home appliances. The application of cold-rolled steel can be found even in the smallest gadget used in homes. Various appliances use cold rolled steel, such as water heaters, washers, dryers, and PCs. Cold-rolled steel has tighter tolerances than other metals, so it is commonly used in household appliances.
Pressure Vessels
Different materials’ cores are subjected to extremely high pressure via the pressure vessels. The petrochemical and nuclear industries rely heavily on these boats. Due to its elongation rate, embrittlement, and fatigue strength, cold-rolled steel is employed in pressure vessels. Cold-rolled steel is applied in pressure vessels to compress the total pressure created by the vessel on the finished product due to its physical characteristics.
Machinery
It has been established that cold rolling can be 20% stronger than hot rolling. Cold-rolled steel has low yield strength, good mechanical characteristics, no aging, and great stamping performance. As a result, molding, punching, drilling, and cutting with high precision may be performed. Hence, this can manufacture some really precise shapes with no internal stresses. Therefore, this material is used by many mechanical goods during the manufacturing process. You’ll find cold-reduced steel in various fastening methods and components for various household parts.
Manufacturing
The manufacturing sector employs cold-formed steel construction frequently for various purposes, including building materials, building frames, steel sheds, and a wide variety of shapes. The cold-rolled steel sheet is a thin, flat, rectangular sheet of metal that has been finished and twisted or coiled after cold rolling. The cold-rolled steel coil is similar to the cold-rolled tube, a steel pipe with a hollow part. Along with that, it has a length that is substantially greater than its diameter or circumference.
Cold Rolled Strip Steel Finishes
Number 1 or Matte (Dull) Finish
A finish without luster produced by rolling on rolls roughened by mechanical or other means. This finish is especially suitable for paint adhesion. It also aids in drawing by reducing the amount of contact and therefore the friction between the die and the steel surface. Additionally, lubricating fluid will more easily adhere to the rougher surface this type of finish.
Number 2 or Regular Bright Finish
Produced by rolling on moderately smooth rolls. It is a suitable for many requirements, but not generally applicable to bright plating.
Number 2 1/2 or Better Bright Finish
A smooth finish suitable for those plating applications where high luster is not required.
Number 3 or Best Bright Finish
Generally of high luster produced by special rolling practices, including the use of specially prepared rolls. It is the smoothest and most difficult finish to produce and is particularly suited for bright plating. The production of this finish requires extreme care in processing and extensive inspection. Paper interleaving is frequently used for protection.
Key Differences Between Hot Rolled Steel and Cold Rolled Steel
As indicated above, the main difference between hot rolled steel and cold rolled steel is the temperature at which they are processed. Hot rolled steel is rolled above the material’s recrystallization temperature, whereas cold rolled steel is rolled below the material’s recrystallization temperature. Beyond this quality, there are a few other distinctions between the two materials, including in regard to the following:
Surface Quality
Hot rolled steel tends to have rough edges and surfaces that require decarburization or other treatments to prepare it for use in subsequent production operations. In contrast, cold rolled steel generally has a shiny and smooth surface that allows it to be used as-is in production operations.
Material Hardness
The cold rolling process produces steel with much higher strength and hardness than the steel produced by the hot rolling process.
Internal Stress
The greater material strength and hardness introduced by the cold rolling process comes with greater internal stresses. These stresses must be relieved before the material can be processed; otherwise, the final part or product may experience warping.
These two steel types should not be confused with the technical specifications or grades used to classify steel by composition or physical characteristics. Steel can be hot rolled or cold rolled regardless of its metallurgical specifications or grade.
When evaluating steel options for a project, it is important to keep in mind that some materials will work better than others for certain purposes. Understanding which type of steel offers the right properties for a given application can prevent overspending on raw materials and save time in the long run.
What Is The Production Process For Cold-Rolled Steel?
Cold-rolled steel is a type of steel that is processed at room temperature, resulting in a smoother and more refined surface finish compared to hot-rolled steel. The production process for cold-rolled steel involves several stages, including:
Raw Material Selection
The first stage involves selecting the appropriate raw materials, which are typically low-carbon steel sheets or coils. The selection of the raw material is crucial as it determines the final properties and quality of the cold-rolled steel.
Cleaning and Pickling
The raw material is then cleaned and pickled to remove any impurities, rust, or scale that may be present on the surface. This process is done using a combination of acid baths and rinses.
Cold Rolling
Once the raw material has been cleaned and pickled, it is then fed through a series of rollers in a cold rolling mill. The rollers compress and shape the material to the desired thickness, reducing its thickness by up to 50%. This process also results in the material becoming harder and stronger.
Annealing
After the cold rolling process, the material may undergo annealing, which involves heating the steel to a specific temperature and holding it there for a period of time before cooling it slowly. This process helps to reduce the material's hardness and increase its ductility, making it easier to form and shape.
Skin Pass Rolling
The material may also undergo skin pass rolling, which involves passing it through a series of rollers that apply a light pressure to improve the material's surface finish.
Cutting and Slitting
Once the cold-rolled steel has been processed, it is cut and slit to the desired size and shape. This process may involve shearing or sawing the material, depending on the requirements.
Final Inspection and Quality Control
Finally, the cold-rolled steel undergoes a series of inspections to ensure that it meets the required standards for strength, thickness, and surface finish.
Maintenance Cold Rolled Steel
Regular cleaning
The first step in maintenance of cold rolled steel is regular cleaning using a mild detergent and water. This helps to remove any dirt, dust, and other harmful particles that may cause damage to the surface of the steel.
Rust prevention
Cold rolled steel is prone to rust, and hence, it is essential to prevent rust formation by using a rust inhibitor or protective coating. This helps to protect the surface of the steel from moisture, which can lead to rust formation.
Lubrication
Lubrication is another essential step in the maintenance of cold rolled steel. This involves the application of a high-quality lubricant, which helps to reduce friction between the steel surfaces, thereby minimizing wear and tear.
Inspection
Regular inspection of the steel is essential to detect any signs of damage or wear and tear, which can lead to corrosion or other issues. This helps to prevent costly repairs and replacements in the long run.
Proper storage
Proper storage of cold rolled steel is also critical to its longevity. This involves keeping the steel in a dry, clean, and well-ventilated space, away from moisture and other harmful environmental factors.
Our Factory
The company's import and export business volume has increased year by year and has become one of the company's important businesses. Adhering to the tenet of "quality first, customer first", the company continuously improves service levels and product quality to meet market demand and customer expectations, and contribute to the development of the metal material industry.
FAQ
As one of the leading cold-rolled steel suppliers in China, we warmly welcome you to wholesale bulk high-grade cold-rolled steel in stock here from our factory. All metal materials are with high quality and competitive price.
S325G, DC01, Cold rolled Steel