This hollow bored steel forging blank is purpose-built for use in rotary equipment where concentricity, internal strength, and fatigue resistance are critical. Produced via open-die forging and custom-machined to precise bore dimensions, it is ideal for applications such as rotary shafts, drive drums, couplings, and hydraulic cylinder bases. The hollow structure reduces material weight while maintaining mechanical integrity under torsional, axial, and vibrational loads.
Crafted from high-performance alloy or carbon steels like 42CrMo4, 35CrMo, or 18CrNiMo7-6, each forging undergoes strict heat treatment and ultrasonic inspection to ensure uniform grain flow, minimal inclusions, and high internal soundness. Bore diameter, wall thickness, and length can all be customized to meet demanding industrial or heavy-duty specifications.
Inspection and Quality Control
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Ultrasonic Testing (UT): Ensures internal flaw-free condition for high-speed rotation
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Dimensional Inspection: Precision bore gauges, micrometers, and runout tests
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Mechanical Testing: Tensile, impact, and hardness evaluations post heat treatment
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Microstructure Examination: Grain refinement and inclusion control verified via metallography
Why Choose Our Forging Blanks
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Reduced weight without sacrificing strength
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Excellent fatigue resistance for rotary motion
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Customizable shapes including stepped bores, tapered ends, or flange interfaces
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Optimized for high-reliability use in wind turbines, petrochemical pumps, steel mill gearboxes, and mining drives
Advantages
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Excellent performance in shock load and rotating torque conditions
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Enhanced wear resistance through carburized surface layer
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Strong core ductility prevents cracking or brittle failure
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Material allows tight dimensional tolerances for gear finishing
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Available in custom sizes, one-off prototypes, or batch production
| Item |
Details |
| Product Name |
Hollow Bored Steel Forging Blank for Rotary Equipment |
| Material Grades |
- Alloy steels suitable for boring and rotary stress resistance: e.g., 42CrMo4, 18CrNiMo7-6 - Excellent machinability and impact absorption - Specifically adapted for inner bore formation while retaining high outer wall strength |
| Forging Equipment |
- Hydraulic Hammers: 5T, 8T, 12T capacity - Configured for forging of bored shafts, thick-wall rings, and tubular blanks - Enables near-net shape forging with axial bore requirements |
| Manufacturing Process |
Hot Forging → Thermal Refinement → Boring / Core Machining → Rough or Precision Machining → Dimensional & Integrity Evaluation |
| Forging Ratio |
≥ 3.0 — Delivers improved fiber orientation along the rotational axis, minimizing internal defects and optimizing rotational balance under dynamic stress |
| Applications |
Developed for: - Rotary components such as bored shafts, rotating sleeves, and drum shafts - Ideal for mixers, rotary tables, rolling mill drives, and large gear couplings - Capable of enduring cyclical rotational loads, torque peaks, and hollow center cooling in high-performance mechanical assemblies |
| Heat Treatment Options |
- Normalized + Tempered based on strength requirements - Intermediate stress relieving available prior to final machining |
| Testing & Inspection |
- Chemical Composition: Spectrometer validation for alloy uniformity - Mechanical Properties: Hardness profiling, tensile, and impact strength - Ultrasonic Examination: Multi-angle UT scanning for hollow bore consistency - Dimensional Testing: Bore tolerance, straightness, wall thickness verification |
| Value-Added Services |
- Custom boring diameter, length, and wall profile options - Pre-machined surfaces, protective packaging, anti-corrosion measures - Support for export handling, part labeling, and marine-ready logistics |
The steel forgings production flow:
raw material inspection → unloading → inspection → preheating → forging → heat treatment → inspection → rough machining → non-destructive testing → inspection → packaging → delivery.
Frequently Asked Questions (FAQs)
1. What is your forging weight range?
We produce forged parts ranging from 100 kg to 7000 kg.
2. Do you provide heat treatment and machining?
Yes, we offer full in-house heat treatment, rough, and finish machining services.
3. Which industries do you supply to?
We serve wind energy, heavy equipment, port machinery, transmission systems, and more.
4. What is your production lead time?
With stock: Around 30 days
Without stock: 40–45 days
5. Where is your factory located?
In Changzhou City, near Shanghai, with shipping via Shanghai Port.
Request a Quote
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