Changzhou Tiangong Forging Co., Ltd.
Changzhou Tiangong Forging Co., Ltd.
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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.
These hollow alloy steel forging blanks are essential for critical components in demanding rotary machinery across diverse industries:
| 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 |
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
Please send your technical drawings and requirements to us. Our engineers will review and provide you with a professional quotation and solution shortly.