Steel
We supply hot rolled, cold rolled and galvanized steel.The delivery condition for steel can be in coils,in sheets and in strips.
LUZHEN hot rolled steel includes:gas cylinder steel, pipeline steel, structural steel, anti-corrosion steel, enameling steel,wear resistant steel,steel for automotive structural uses and construction machinery,etc.
Our Cold-rolled steel is mainly used in the fields of automobiles, household appliances, precision instruments and packaging materials,which has high precision and excellent surface quality.
Your Professional Steel Supplier
SHANGHAI LUZHEN SCM CO.,LTD, a trusted exporter specializing in high-quality steel products for global industrial and consumer applications. Our core offerings include cold-rolled, hot-rolled, and galvanized steel coils-ideal for automotive and home appliance manufacturing-as well as stainless and carbon steel discs used in hardware and kitchenware production. Complementary auxiliary materials are available to support seamless integration into your operations.
Why Choose Us
High-Quality & Diversified Products
We supply high-quality steel products (including cold-rolled, hot-rolled, galvanized coils, and steel blanks), gas cylinders, various types of valves, and supporting materials.
Efficient Cross-Border Supply Chain
Our mature global supply chain ensures swift response and reliable on-time delivery, reducing your waiting costs.
Rigorous Quality Control & Acceptance Procedures
Built on the "Quality as Foundation" principle, our rigorous control system ensures reliable product quality from sourcing to delivery.
Mature Market Experience & Considerate Service
We provide dependable supply chain support to key industries across 30+ countries, ensuring stability for our partners in manufacturing, energy, and public utilities.
Advantages of Cold Rolled Strip
Strength
CRS is stronger than its hot rolled steel, mainly due to the work hardening during the cold rolling process. When steel is rolled at room temperature, the metal's grains are deformed, increasing its dislocation density. This internal structure change enhances the material's yield and tensile strength.
Surface Quality
Unlike hot-rolled steel, which can have scale and surface imperfections from high-temperature processing, cold rolled steel is generally absent from defects. The absence of scale and other impurities makes it easier to coat, paint, or plate for additional protection or aesthetic purposes.
Dimensions
Cold rolled steel has tighter dimensions because it's processed at or near room temperature, which reduces the chance of warping, twisting, or bowing during production. Cold rolled steel is also compressed between rollers during the process, which creates a thinner, smoother product with tighter dimensional tolerances.
Improved Mechanical Properties
The cold rolling process enhances the surface quality and improves cold rolled steel's mechanical properties (strength and hardness).
Technical Specification
|
Material used |
Metal, Stainless Steel. GI, carbon |
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Shapes/Designs |
Square |
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Surface finishing |
Polished |
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Dimension |
Customized |
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Usages |
Industrial |
The Cold Rolled Strip Manufacturing Process
Hot Rolled Steel (Starting Point)
Before the cold rolling process begins, steel is first produced using the hot rolling process. In hot rolling, the steel is heated above its recrystallization temperature and passed through rollers to reduce its thickness into slabs, billets, or plates.
Pickling
After the hot rolling process is completed, the steel typically undergoes pickling, which is a cleaning process that uses acidic solutions to remove the oxide scale and other surface impurities from the hot rolled product.
Cold Rolling Process
The following steps, followed by the optional annealing process, are the core basis for creating cold rolled steel.
Room Temperature Rolling
The cleaned and dried hot rolled steel is first subjected to the cold rolling process at or near room temperature. This is done by passing the steel through a series of rollers, which gradually reduce the thickness to the desired final gauge.
Strain Hardening
As the steel is deformed at lower temperatures, its crystal structure is refined and strained, leading to improved tensile strength and hardness. This deformation process, often referred to as cold working, results in increased strength but also makes the steel less ductile.
Dimensional Precision & Surface Quality
Cold rolling significantly improves the dimensional tolerances and surface finish of the steel compared to its hot rolled counterpart. The process produces a smoother, more uniform surface, which is beneficial for applications requiring tight tolerances and a polished appearance.
Annealing (Optional)
Depending on the specific application requirements, the cold rolled steel may undergo an annealing process. During annealing, the material is heated to a moderate temperature and then slowly cooled. This step helps to relieve internal stresses induced during the cold rolling process, thereby enhancing ductility and further refining the grain structure.
Final Processing & Inspection
Finishing - The final cold rolled product may be subjected to additional finishing processes, such as leveling, trimming, or coating, depending on the application requirements.
Quality Control - Rigorous inspection and testing are conducted to verify that the product meets all required specifications, such as thickness tolerance, surface finish, and mechanical properties.
Common Applications of Cold Rolled Strip
Cold-rolled steel strip is widely used in the automotive industry for body panels and structural parts. In home appliances, it is applied in refrigerators, washing machines, and ovens due to its smooth surface and strength. It is also essential in construction, metal furniture, electrical enclosures, and precision engineering components.
FAQ
As one of the most professional steel manufacturers and suppliers in China, we're featured by quality products and good price. Please rest assured to buy bulk discount steel from our factory. We also accept customized orders.
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