High-Strength Hollow Alloy Steel Forging Blank for Rotary
Machinery.This forged hollow alloy steel blank is engineered for critical
rotary applications requiring high strength, fatigue resistance,
and dimensional stability under cyclical loading. Produced through
hot open-die forging and precision boring, it offers exceptional
metallurgical integrity and customizable geometry for a wide range
of rotating components. Product Features- Optimized Strength-to-Weight: Hollow design reduces weight while maintaining exceptional
strength for high-speed machinery.
- Superior Material Integrity: Forging refines grain, eliminating defects for enhanced toughness
and ductility.
- High Fatigue Resistance: Engineered from alloy steel to resist cyclic loading and torsional
stresses, extending lifespan.
- Excellent Machinability: Controlled forging ensures material is amenable to precise
machining for tight tolerances.
- Customizable: Available in various alloy grades and tailored dimensions to meet
specific rotary application needs.
- Enhanced Heat Treatment Response: Allows for optimal response to heat treatments for customized
hardness and mechanical properties.
Application ScenariosThese hollow alloy steel forging blanks are essential for critical
components in demanding rotary machinery across diverse industries: - Turbomachinery: Ideal for turbine and compressor shafts, and hollow rotor
components in gas and steam turbines.
- Wind Power: Used for hollow main shafts or internal gearbox shafts, optimizing
weight while maintaining immense strength.
- High-Speed Industrial Gearboxes: For hollow input, intermediate, or output shafts where reduced
inertia and high torque are vital.
- Marine & Offshore Propulsion: Components for hollow propeller shafts and main transmission
shafts in ships and offshore platforms.
- Large Motors & Generators: Used for hollow rotor shafts, balancing weight with the need for
robust structural integrity.
- Aerospace & Defense: For various hollow shafts and rotating components where weight
reduction and reliability are paramount.
- Heavy Industrial Rollers/Spindles: For large, strong, yet lighter-weight rotating elements in
specialized machinery.
| Item | Details |
|---|
| Product Name | High-Strength Hollow Alloy Steel Forging Blank for Rotary Machinery | | Material Grades | - High-performance alloy steels: 42CrMo4 / 35CrMo/ 18CrNiMo7-6 -
Superior tensile strength, impact resistance, and fatigue life -
Designed for hollow-core components operating under rotary stress | | Forging Equipment | - Hydraulic hammers: 5T / 8T / 12T - Large open-die forging press
with axial boring capabilities - Supports near-net shape forging
with internal bore formation | | Manufacturing Process | Hot Forging → Intermediate Heat Treatment → Core Boring / Drilling
→ Rough / Semi-Finish Machining → UT & Dimensional Inspection | | Forging Ratio | ≥ 3.0 — Enhances grain orientation around the bore, critical for
minimizing fatigue cracks and maintaining balance in rotating parts | | Applications | - Rotary shafts, bored coupling sleeves, hollow drums, and tubular
drive shafts - Ideal for gearboxes, kilns, mixers, and rolling mill
transmissions - Engineered to handle torsional vibration, internal
cooling channels, and cyclical dynamic loads | | Heat Treatment Options | - Quenched + Tempered for maximum core strength and toughness -
Optional stress relief for dimensional stability prior to precision
machining | | Testing & Inspection | - Chemical: Spectrometer-controlled alloy verification - Mechanical: Hardness, tensile strength, yield, and Charpy impact - Ultrasonic (UT): Multi-angle scanning focused on internal bore zones - Dimensional: Bore diameter, straightness, wall thickness, concentricity, and
length control | | Value-Added Services | - Custom bore diameter, wall profile, and external features -
Pre-machined surfaces (journals, end faces, grooves) -
Rust-preventive coating, end protection, steel banding & crate
packaging - Laser marking, OEM branding, and complete traceability
documents |
Item | 42CrMo Alloy Steel | 18CrNiMo7-6 Alloy Steel | Steel Grade (GB / ASTM) | 42CrMo / 42CrMo4 (Equivalent to AISI 4140 / SAE 4140) | 18CrNiMo7-6 / 1.6587 (Equivalent to AISI 4320) | Carbon Content | Approx. 0.38–0.45% | Approx. 0.15–0.21% | Tensile Strength | 850–1100 MPa (after quench & temper) | 1180–1380 MPa (quenched and tempered) | Yield Strength | ≥ 740 MPa | ≥ 1080 MPa | Hardness (HBW) | 280–360 (quenched & tempered) | 341–388 (quenched & tempered) | Toughness | Excellent toughness and fatigue resistance | Exceptionally high toughness, superior fatigue and wear resistance | Machinability | Moderate, machining recommended after heat treatment | Moderate, requires careful machining due to high alloy content | Heat Treatment Options | Quenched and Tempered (standard for shafts) | Quenched and Tempered, Carburized, Nitrided | Typical Applications | Drive Shafts / Couplings, Roll Shafts, Reactor Shaft, Yaw / Pitch
Shaft | Transmission gears, axles, high-load bearing components, aerospace
and automotive critical parts | Forging Suitability | Ideal for high-strength, high-fatigue wind turbine shafts | Excellent forging properties, suitable for complex high-stress
components |
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