Product Definition
Engineered Billets for Critical Hot Forming Processes
Our pure iron billets (Fe≥99.9%) serve as premium starting stock for forging, rolling, and extrusion operations. With controlled residuals and uniform internal structure, they outperform standard billets in high-ratio deformation applications demanding structural integrity and surface quality.
Key Specifications
|
Parameter |
Value |
Industrial Significance |
|
Cross-Section |
100x100mm to 400x400mm |
Optimized for reduction ratios up to 12:1 |
|
Length |
1-6 meters |
Minimizes crop ends in continuous mills |
|
Surface Quality |
Sa 3.0 (Blast cleaned) |
Eliminates scale-induced defects |
|
Internal Soundness |
Class 1 per ASTM E381 |
Zero shrinkage porosity |
|
Decarburization Depth |
≤0.1mm (post-reheat) |
Preserves core machinability |
Composition Advantages
|
Element |
Control Range |
Hot-Working Benefit |
|
C |
0.008-0.020% |
Balanced for forgeability & final strength |
|
Mn |
≤0.025% |
Prevents hot shortness during rolling |
|
S |
≤0.006% |
Avoids edge cracking at >1000°C |
|
O₂ |
≤60 ppm |
Reduces surface pitting in open-die forging |
|
Si |
≤0.02% |
Minimizes oxide scale adhesion |
|
P |
0.015-0.030% |
Enhances fluidity in heavy forging |
Trace elements (Cr+Ni+Cu) < 0.03% collectively
Processing Recommendations
Optimized Parameters for Common Operations:
|
Process |
Temperature Range |
Reduction Ratio |
Surface Result |
|
Open-Die Forging |
1150-850°C |
3:1 to 6:1 |
Ra 12.5μm (as-forged) |
|
Hot Rolling |
1100-750°C |
Up to 12:1 |
Scale-free edges |
|
Extrusion |
1000-900°C |
8:1 to 15:1 |
No lap defects |
Target Applications
- Power Generation: Rotor shafts for hydro turbines
- Defense: Armor plate backings after explosive cladding
- Tooling: Forged die blocks with uniform hardness
- Nuclear: Containment vessel studs (ASME SA-105 compliant)
Factory Capabilities
Billet-Specific Production Advantages
- Continuous casting with soft reduction (0.5-2mm/m)
- On-line ultrasonic testing (≥φ3mm flaw detection)
- Slow cooling pits: 48hrs at 350°C to prevent H₂ flaking
- Custom end cropping & chamfering (45°±5°)
Q: Can billets withstand multiple reheating cycles?
A: Yes. Proprietary scale-resistant composition maintains surface integrity through 3 heat cycles. Weight loss <0.8% per cycle vs. 2.5% standard.
Q: Do you provide pre-machined billets for near-net-shape forging?
A: We offer CNC-turned billets with ±0.5mm OD tolerance. Saves 40% machining time in closed-die forging.
Q: How do you ensure straightness in long billets?
A: Laser-guided straightening achieves <3mm/m deviation. Post-straightening stress relief at 650°C prevents re-bending.
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