Extra Deep Drawing Cold Rolled Steel Coil
01 Product Overview
Extra deep drawing cold rolled steel coil is used for sheet metal components that require substantial deformation during pressing and drawing. Typical parts include deep-drawn components, complex stamped shapes and sheet metal products with demanding forming requirements.
For these applications, tensile strength alone is not enough to determine material suitability. Elongation, plastic strain ratio (r-value) and strain-hardening exponent (n-value) are also important. These properties help buyers assess how the steel will deform during forming and whether the selected grade is suitable for the component geometry and stamping process.
Our steel product business covers coils, sheets and strips, giving buyers access to a range of steel product categories through one supplier. For extra deep drawing applications, the material grade and delivery specifications should be selected according to the part drawing, forming conditions and required standard.
02 Product Grades and Specifications
Grade Selection
| Grade | Formability Classification | Typical Selection |
|---|---|---|
| DC04 | Deep drawing | Components requiring deep drawing performance |
| DC05 | Extra deep drawing | Parts involving more demanding drawing and forming operations |
| DC06 | Super deep drawing | Applications requiring a higher level of formability |
DC05 and DC06 serve different forming requirements. DC06 has higher reference r-value, n-value and elongation requirements in the data below. The appropriate grade depends on drawing depth, component geometry, tooling design and forming conditions.
Grade Reference Equivalents
| Grade | Reference Grade Designations |
|---|---|
| DC05 | St15, SPCF, DDS |
| DC06 | St16, SPCG, EDDS |
These designations come from different standards and should not be treated as automatic equivalents. Confirm the applicable standard and mechanical property requirements before specifying a substitute grade.
Reference Mechanical Properties
| Property | DC05 | DC06 |
|---|---|---|
| Yield Strength | 120–180 MPa | 110–170 MPa |
| Tensile Strength | 270–330 MPa | 270–330 MPa |
| Plastic Strain Ratio (r90) | ≥1.9 | ≥2.1 |
| Strain-Hardening Exponent (n90) | ≥0.20 | ≥0.22 |
Reference Elongation by Thickness
| Thickness | DC05 A80 | DC06 A80 |
|---|---|---|
| 0.30–0.50 mm | ≥35% | ≥37% |
| 0.50–0.70 mm | ≥38% | ≥39% |
| 0.70–1.00 mm | ≥40% | ≥41% |
| 1.00–1.60 mm | ≥40% | ≥42% |
| ≥1.60 mm | ≥41% | ≥43% |
Elongation requirements vary with thickness. When comparing material specifications, check the full set of mechanical properties together with the applicable test method and acceptance requirements.
Applicable Standards
- EN 10130
- JIS G 3141
- GB/T 5213
The specified standard and grade should be stated in the purchase agreement. When comparing grades across standards, check their definitions and mechanical property requirements rather than relying on similar designations alone.
03 Forming Performance and Applications
The main selection question is whether the steel can accommodate the deformation required by the finished component.
- Automotive stamped components: Grade selection should reflect the component geometry, drawing depth and forming sequence.
- Home appliance panels and housings: Forming performance and surface quality both matter, particularly for visible finished parts.
- Deep-drawn metal containers: Elongation and forming characteristics help assess suitability for the required drawing operation.
- Complex sheet metal parts: DC05 or DC06 may be considered when the forming requirements call for extra or super deep drawing performance.
The part drawing, tooling design and stamping conditions are useful starting points for selecting the material grade and mechanical property requirements.
04 Surface Condition and Delivery State
Surface condition and delivery state affect subsequent stamping, coating and finishing operations. Buyers should specify these requirements according to the production process and finished-part appearance.
| Item | Specification to Confirm |
|---|---|
| Surface finish | Required surface roughness and finish |
| Surface quality | Required surface quality level |
| Annealing | Required annealed delivery condition |
| Skin-pass | Whether skin-pass processing is required after annealing |
| Coil edge | Mill edge or slit edge |
| Slitting | Required slit width and edge quality |
Annealing and skin-pass requirements should be considered together with the target mechanical properties and surface condition. For deep drawing applications, the delivery condition should match the intended forming process.
05 Customization and Coil Specifications
The main purchasing specifications for cold rolled steel coil include:
| Specification | Details to Confirm |
|---|---|
| Material grade | DC04, DC05 or DC06 |
| Applicable standard | EN 10130, JIS G 3141, GB/T 5213 or another specified standard |
| Thickness | Required thickness and tolerance |
| Width | Required coil width and tolerance |
| Coil dimensions | Inner diameter (ID) and outer diameter (OD) |
| Coil weight | Required individual coil weight |
| Surface | Surface finish and quality requirements |
| Delivery condition | Annealing and skin-pass requirements |
| Edge condition | Mill edge or slit edge |
| Slitting | Slit width and burr requirements |
These details help align the material specification with the customer's stamping equipment, tooling and downstream processing. For repeat purchasing, keeping the grade, standard, dimensions and acceptance requirements consistent makes it easier to compare orders and inspect incoming material.
06 Manufacturing, Quality and Supplier Support
Shanxi Midas Industrial Co.,Ltd was established in 2012. Our steel product business includes steel coils, sheets, strips and structural steel, with operations covering steel product development, design, production and sales.
Our broader steel business is supported by factory facilities, production equipment, technical personnel and inspection resources. We also provide product consultation, discuss customized requirements, communicate order progress and handle after-sales issues.
For extra deep drawing steel, buyers should pay particular attention to the following quality and inspection items:
- Chemical composition, including C, Mn, P, S, Ti and Nb
- Material grade and applicable standard
- Coil thickness, width and dimensional tolerances
- Surface condition
- Yield strength and tensile strength
- Elongation
- Plastic strain ratio (r-value) and strain-hardening exponent (n-value), where specified
- Material test certificate (MTC) and batch identification
Confirming these requirements before ordering helps align the material supplied with the intended forming process and incoming inspection criteria.
07 Packaging and Export Supply
Coil packaging should account for moisture protection, handling and transportation. Packaging requirements can be specified according to the shipment route, coil weight, container loading and destination handling conditions.
Items to confirm include moisture-resistant or waterproof paper, protective plastic film, steel strapping, and steel or wooden pallets. The required packaging arrangement should be included in the order details so that it can be reviewed alongside the shipment requirements.
08 FAQ
What is the difference between DC05 and DC06?
DC05 is classified as an extra deep drawing grade, while DC06 is a super deep drawing grade. The reference data shows higher r-value, n-value and elongation requirements for DC06. Select the grade according to the component design and forming conditions.
What properties matter when buying extra deep drawing steel coil?
Check yield strength, tensile strength and elongation. For demanding forming operations, also specify the required r-value and n-value, together with the material grade and applicable standard.
Can DC05 or DC06 be used for automotive stamping?
Both grades may be considered for automotive stamped components requiring deep or complex forming. The selection depends on part geometry, drawing depth, tooling and production conditions.
What coil dimensions should I specify?
Provide the required thickness, width, dimensional tolerances, individual coil weight, inner diameter and outer diameter. These details help match the coil to your processing equipment and handling requirements.
What should I specify for surface and delivery condition?
State the required surface quality, annealing condition, skin-pass requirement and mill-edge or slit-edge preference. These details should be consistent with the intended stamping and finishing processes.
What information is needed for a quotation?
Please share the material grade or application, applicable standard, thickness, width and estimated quantity. A technical specification or part drawing can also help clarify the material requirements.
Request a Quotation
Send us your required grade, dimensions and estimated quantity. You can also include a material specification or part drawing so we can review the requirements for your application.
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