Cold Rolled Steel Sheet and Coil
Flat-Rolled Steel
- Coil weight max. 20t, or customizable
- Minimum order quantity 20 tonnes
Batch-Annealed Cold Rolled Steel Sheet
- Thickness0.18-2.0mm
- Width900-1500mm
- GradeSPCC/DC01/DC03
- Production Capacity 7 production lines 5,000,000 tonnes/year
- Surface Roughness Rough/Lustrous
Continuously-Annealed Cold Rolled Steel Sheet
- Thickness 0.4-2.0mm
- Width900-1500mm
- GradeSPCC/DC01
- Production Capacity6 production lines 3,000,000 tonnes/year
- Surface Roughness Rough/Lustrous
Worldwide delivery from the Philippines available upon request
Cold rolled steel coils are produced by processing hot rolled steel through a series of cold rolling and annealing stages. Two primary annealing methods are used: continuous annealing and batch annealing. Each method offers unique advantages, allowing us to meet diverse customer requirements with both production capabilities and equipment.
In continuous annealing, the steel strip passes through a large vertical furnace, undergoing a series of steps including preheating, heating, soaking, cooling, over-aging, and final cooling. This method ensures a shorter production cycle and uniform product quality, making it ideal for aluminum-killed steel when moderate stamping performance is sufficient. It’s also effective for IF steel, which requires high stamping performance. Continuous annealing supports faster delivery times but often requires larger batch sizes for new product development.
Batch annealing, on the other hand, involves three key stages: degreasing, annealing, and finishing. The steel is slowly heated, held at a consistent temperature for an extended period, and then gradually cooled. This allows for a thorough recrystallization and carbide formation, which enhances its suitability for aluminum-killed steel with moderate stamping requirements. While batch annealing accommodates smaller batch sizes for new products, its delivery cycle tends to be longer compared to continuous annealing.
Both methods provide flexibility in meeting different production and delivery needs, depending on the specific application and customer requirements.
- Types of Cold Rolled Steel
- Mechanical Properties
- Applications
| Steel Type | Cold Formed Steel | Structural Steel | Heat-Treated Structural Steel | |
| Usage | Primarily used for parts that require simple or moderately complex deformation processes. These parts generally do not endure heavy loads, making this steel suitable for applications such as automotive body panels, machinery housings, food containers, and oil drums. | Commonly employed for structural components that undergo simple deformation processes such as bending. These parts typically bear higher loads and are used in applications like building frameworks, vehicle chassis, and external panels for appliances such as refrigerators. | Mainly used for components that require heat treatment to achieve specific mechanical properties. Depending on the heat treatment process, the steel can be tailored for various applications, including machinery parts and precision-cut components. | |
| Requirements | Designed to meet the needs of parts that require moderate complexity in processing and deformation without compromising structural integrity. | Must withstand significant external forces without deforming, ensuring the structural integrity of the components under high stress. | Must meet specific heat treatment requirements to ensure the desired mechanical properties are achieved, such as hardness, toughness, and resistance to wear. | |
| Indicator | Processing performance indicators include yield strength ratio (ReL/Rm), plastic strain ratio (r-value), and strain hardening exponent (n-value), which collectively determine the material’s formability and suitability for various applications. | Mechanical performance indicators include yield strength (ReL), tensile strength (Rm), and elongation after fracture (δ), which help assess the steel’s ability to endure stress and deformation under load. | Chemical composition indicators include elements like carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), and aluminum (Al), which are critical for achieving the intended performance after heat treatment. | |
| Classifications of Steel | By Steel Quality Commercial quality (CQ) Drawing quality (DQ) Deep drawing quality (DDQ) Extra-deep drawing quality (EDDQ) Super extra-deep drawing quality (SEDDQ) | By Yield Strength 195 215 235 275 | By Carbon Content 03Al 08Al | |
| Grade | Chinese Standard | DC01, DC03, DC04, DC05 | Q195, Q215, Q235, Q275 | 03Al, 08Al |
| Japanese Standard | SPCC, SPCD, SPCE, SPCF | SS330, SS400, SS490, SS540 | S10C | |
| USA Standard | CSypec, CSypeA.B, DDS | - | SAE1006, SAE1008, SAE1010 | |
Technical Specifications
| Type | Batch-Annealed Cold Rolled Steel Sheet | Continuously-Annealed Cold Rolled Steel Sheet |
| Thickness | 0.18-2.0mm | 0.4-2.0mm |
| Width | 900-1500mm | 900-1500mm |
| Grade | SPCC/DC01/DC03 | SPCC/DC01 |
| Production Capacity | 7 production lines 5,000,000 tonnes/year | 20 production lines 800,000 tonnes/year |
| Surface Roughness | Rough/Lustrous | Rough/Lustrous |
Tolerances of Dimensions
| Width Tolerance | Nominal Thickness | Normal Accuracy PW.A | Advanced Accuracy PW.B |
| ≤1200 | 0-5 | 0-2 | |
| >1200-1250 | 0-6 | 0-2 | |
| Thickness Tolerance | To ensure customer satisfaction, our standard products are delivered with negative tolerances. If specific requirements are needed, they should be communicated when placing the order. | ||
| Our thickness tolerances are more stringent than the Chinese national standards. However, slight variations may occur at the beginning or end of the steel coils (within the first or last 30 meters), which is a common industry practice. | |||
Mechanical Properties of Continuously-Annealed Cold Rolled Steel Sheet
To improve product quality, our internal standards exceed Japanese standards for mechanical properties, ensuring enhanced yield strength, tensile strength, and elongation performance.
| Grade | Thickness (mm) | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation A50 (%) | Tensile Strain Mark | |||
| Standard | Internal Control | Standard | Internal Control | Standard | Internal Control | |||
| SPCC | 0.4-0.8 | - | ≤270 | >270 | 300-410 | ≥36 | ≥39 | No requirements |
| ≥0.8-1.2 | - | ≤260 | >270 | 300-410 | ≥37 | ≥39 | ||
| ≥1.2 | - | ≤250 | >270 | 300-410 | ≥37 | ≥39 | ||
| SPCD | 0.4-0.8 | ≤240 | ≤230 | >270 | 290-400 | ≥38 | >40 | Under standard room temperature storage conditions, steel sheets and coils with an FD surface grade should be used within three months of production to avoid the appearance of tensile strain marks. |
| ≥0.8-1.2 | ≤240 | ≤220 | ≥270 | 290-400 | ≥39 | >42 | ||
| ≥1.2 | ≤240 | ≤220 | ≥270 | 290-400 | ≥39 | >42 | ||
Mechanical Properties of Batch-Annealed Cold Rolled Steel Sheet
Our production complies with European (national) standards, and to ensure superior product quality, we implement internal controls that exceed these benchmarks.
| Grade | Thickness (mm) | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation A80 (%) | R Value | N Value | Tensile Strain Mark | |||||
| Standard | Internal Control | Standard | Internal Control | Standard | Internal Control | Standard | Internal Control | Standard | Internal Control | |||
| DC01 | 0.4-0.6 | 280 | 260 | 270-410 | 300-410 | ≥28 | ≥28 | - | ≥1.3 | - | - | Under standard room temperature storage conditions, FD-grade steel sheets and coils should be used within three months of production to prevent the formation of tensile strain marks. |
| >0.6-0.8 | 280 | 250 | 270-410 | 300-410 | ≥28 | ≥29 | - | ≥1.3 | - | - | ||
| ≥0.8-1.2 | 280 | ≤245 | 270-410 | 300-410 | ≥28 | ≥29 | - | ≥1.3 | - | - | ||
| ≥1.2 | 280 | ≤240 | 270-410 | 300-410 | ≥28 | ≥30 | - | ≥1.3 | - | - | ||
| DC03 | 0.4-0.8 | 240 | ≤240 | 270-370 | 300-410 | ≥34 | ≥34 | ≥1.3 | ≥1.4 | - | ≥0.16 | For regular-grade steel sheets and coils, use within six months under similar storage conditions to ensure the material remains free of tensile strain marks. |
| >0.8-12 | 240 | 230 | 270-370 | 300-410 | ≥34 | ≥35 | ≥1.3 | ≥1.4 | - | ≥0.16 | ||
| ≥1.2 | 240 | ≤220 | 270-370 | 300-410 | ≥34 | ≥36 | ≥1.3 | ≥1.4 | - | ≥0.16 | ||
Surface Quality
| Classification | Symbol | Characteristics | Requirements |
| Advanced Surface | FB | Allows for minor surface imperfections that do not impact formability or coating adhesion. These may include slight scratches, indentations, small pits, or slight discoloration due to oxidation. | General Requirements |
| Standard Surface | FC | The exposed surface must meet high quality standards, free from any defects that could affect the appearance or coating adhesion after painting or electroplating. The non-exposed surface should at least conform to FB standards. | Special Requirements |
| Super Advanced Surface | FD | One side must meet the highest quality standards, free from any defects that could affect the final appearance or coating adhesion. The reverse side should at least meet FB standards. | Special Requirements |
Surface Roughness
| Surface Finish | Symbol | Roughness Value |
| Rough | D | 0.4-1.9μm |
| Lustrous | B | ≤0.9μm |
