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Cold Rolled Steel Coil DS Type A/B/C ASTM
| Characteristic | DS Type A | DS Type B | DS Type C |
|---|---|---|---|
| Main goal | Basic punching performance | Standard punching performance | Higher punching performance |
| Strength and hardness | Relatively high | Medium | Relatively low |
| Scalability | Basic level | Common level | Better |
| Chemical composition restrictions | Relatively loose | Moderate | Stricter |
|---|---|---|---|
| Phosphorus content (P) | ≤0.025% | ≤0.025% | ≤0.02% |
| Applicable scenarios | Simple stamping/bending | Most stamping parts | Complex shapes/deep drawing |
Detailed description
DS Type B Cold Rolled Steel Coil
The most commonly used stamping grade steel, equivalent to China's national standard SPCD, European standard DC03/DC04, and Japanese standard SPCD.
Balanced mechanical properties: tensile strength of about 270~380 MPa, high elongation (≥34%).
Suitable for most stamping parts (such as electrical housings, brackets, simple containers).
DS Type C Cold Rolled Coil
The stamping performance is better than Type B, close to deep drawing grade (DDS).
The lower phosphorus content (P≤0.02%) reduces cold brittleness and improves ductility.
For parts that require deeper drawing or complex shapes (such as fuel tanks, lampshades).
DS Type A Cold Rolled Coil
The stamping performance is slightly lower than Type B, with slightly higher strength and lower cost.
Suitable for simple stamping or bending parts (such as structural parts, tool boxes) that do not require high formability.
Typical Applications
1. DS Type A Cold Rolled Steel: Economical basic stamping
Applicable parts:
✅ Flat/shallow bending structural parts (shelf layers, tool boxes)
✅ Low stress covering parts (electric control box housing, distribution cabinet door panels)
✅ Agricultural machinery brackets (harvester baffles, seed drill hoppers)
Prohibited scenarios:
❌ Deep stamping (depth > 50mm)
❌ Parts with bulging rate > 15%
2. DS Type B Cold Rolled Sheet: General stamping ace (main model)
Industry share: home appliance manufacturing (62%), general machinery (28%), building hardware (10%)
Classic cases:
Home appliance field: air conditioner housing (Midea/Gree supply chain), washing machine side panel, microwave oven cavity
Automotive secondary parts: seat bracket, battery tray, wiper base
Electromechanical equipment: motor protective cover, water pump housing, gearbox cover
Process adaptation:
▶ Continuous die stamping (≤800 times/minute)
▶ CNC bending (R angle ≥0.8t)
3. DS Type C Cold Rolled Sheet Steel: Precision deep drawing expert
High-value application scenarios:
🔹 Auto parts: oil pan (deep drawing ratio 2.2), seat belt retractor housing, ABS valve body
🔹 High-end home appliances: range hood fan cover (curved surface stretching), coffee machine extraction chamber
🔹 Electronic devices: lithium battery housing (explosion-proof valve punching), relay shield
Technical advantages:
▶ Solve the problem of orange peel during stamping (surface roughness Ra≤0.6μm)
▶ Avoid necking cracking (uniform elongation ≥22%)
Relationship with other grades of American Standard
Basic grade: CS Type A/B/C (Commercial Steel) → For general use (such as SPCC/DC01).
Deep drawing grade: DDS Type A/B/C (Deep Drawing Steel) → Better performance than DS type, used for complex deep drawing parts (such as SPCE/DC05).
Extra deep drawing grade: EDDS (Extra Deep Drawing Steel) → Highest formability (such as DC06/SPCF).
Selection Recommendation
Prefer DS Type B: covers most stamping needs and is cost-effective.
Need deep drawing or complex forming → choose DS Type C or upgrade to DDS series.
Simple processing/cost-sensitive → DS Type A or CS series.
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