Bright Steel / CD
Cold Drawing
Cold drawing is the process of pulling hot-rolled steel bars through a die at room temperature to improve dimensional tolerance, surface quality, and mechanical properties. It is the most common bright bar production method.
Technical Specifications
Process
Cold Drawing
Tolerance
h9 / h10 / h11
Size Range
Round: 4-90mm | Hexagon: 6-70mm | Square: 8-60mm | Flat: 10x5 - 150x30mm
Standards
EN 10278, EN 10277, DIN 175
Key Features
- Precise dimensional tolerance (h9/h10/h11)
- Improved surface quality (Ra 0.8 - 3.2 µm)
- Enhanced tensile strength and yield strength
- Smooth surface suitable for CNC and automatic lathes
- Chamfering and cut-to-length service
- Fast machining on high-speed machines
- Low scrap rate - material savings
- Raw surface suitable for coating processes
- Wide profile range (round, hexagon, square, flat)
- Defect-free products for safety-critical parts
Applications
- Automotive parts (shafts, pistons, axles)
- Hydraulic and pneumatic cylinder bodies
- CNC automatic lathe machining
- Machine manufacturing industry
- Bolts, nuts, and fasteners
- Furniture and appliance components
- Gear and bearing shafts
- Agricultural machinery parts
Dimension Table
| Profile | Size Range (mm) | Tolerance | Standard | Surface (Ra) |
|---|---|---|---|---|
| Round | 4 - 20 | h9 | EN 10278 | ≤ 1.6 µm |
| Round | 20 - 50 | h9 | EN 10278 | ≤ 2.0 µm |
| Round | 50 - 90 | h10/h11 | EN 10278 | ≤ 3.2 µm |
| Hexagon | 6 - 30 | h9 | EN 10278 | ≤ 1.6 µm |
| Hexagon | 30 - 70 | h10/h11 | EN 10278 | ≤ 2.5 µm |
| Square | 8 - 30 | h9 | EN 10278 | ≤ 2.0 µm |
| Square | 30 - 60 | h10/h11 | EN 10278 | ≤ 3.2 µm |
| Flat | 10x5 - 80x20 | h11 | EN 10278 | ≤ 3.2 µm |
| Flat | 80x20 - 150x30 | h11 | EN 10278 | ≤ 3.2 µm |
Technical Notes
- 01Cold drawing increases tensile strength by 15-20%.
- 02h9 tolerance is applied as standard for diameters below 50mm.
- 03For diameters above 50mm, h10 or h11 tolerance is preferred.
- 04Flat profiles have separate tolerances for width and thickness.
- 05Standard length: 3000-6000mm, custom cutting available on request.
- 06Chamfering provides easy feeding into automatic machines.
- 07Cold drawn products should be selected prior to heat treatment.
Steel Grades
C30C35C40C45C5034CrMo442CrMo4SAE 4140SAE 104516MnCrS520MnCrS511SMnPb3011SMn30S355J2S355J2G351CrV4100Cr6ETG 88ETG 100CK45Ck60
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