Changzhou Tiangong Forging Co., Ltd.
Changzhou Tiangong Forging Co., Ltd.
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Forged Steel Flange 42CrNiMo / C45 – Gearbox and Crane Components – OEM Available
ur Large Size Forged Ring Flanges are manufactured from high-performance alloy steels such as 18CrNiMo7-6 and 42CrMo, ensuring exceptional strength, fatigue resistance, and toughness under extreme working conditions. With a gross weight range from 100kg up to 7000kg, these forged flanges are ideal for wind turbine gearboxes, large-scale industrial gear transmission, marine propulsion systems, and port handling equipment.
Each flange is produced using open die forging techniques, followed by controlled heat treatment (normalizing, quenching, tempering) and precision CNC machining. We offer OEM and custom production according to customer drawings and mechanical specifications.
All products are ultrasonically tested (UT) and comply with international standards such as DIN, GB, and ISO9001. Our flanges are trusted by global leaders in the renewable energy, port machinery, and heavy equipment manufacturing industries.
We support custom dimensions, heat treatment specifications, and machining processes based on customer drawings or technical requirements. With over 25 years of forging expertise, our flanges comply with ISO, GB, and DIN standards, and are ultrasonically tested for internal quality assurance. Trusted by top-tier clients in wind energy and port equipment sectors.
Material: 42CrMo, 42CrNiMo, 18CrNiMo7-6, 20CrMnMo, C45, C35
Forging Type: Open die / Closed die
Weight Range: 100kg – 7000kg
Heat Treatment: Normalizing, Quenching + Tempering
Machining: Rough / Semi-finished / Precision CNC
Standards: Custom / GB / DIN / ANSI
Applications: Wind turbines, port cranes, gearboxes, engineering machinery
| Main Forging service Machine list: | sets | |
| Sample Inspection tester machines in the lab. | ||
| 1 | Spectrometer | 1 |
| 2 | Impact testing machine | 1 |
| 3 | Tensile testing machine | 1 |
| 4 | Metallographic microscope | 1 |
| 5 | Brinell hardness tester | 1 |
| 6 | Notch projector | 1 |
| 7 | Quenching test machine | 1 |
| 8 | high-precision flaw detector | 2 |
| Natural gas equipment | ||
| 1 | Natural gas furnace 15Ton | 6 |
| 2 | Natural gas furnace 20Ton | 1 |
| 3 | Natural gas furnace 30Ton | 3 |
| 4 | Natural gas furnace 40Ton | 1 |
| Sawing machine | 16 | |
| 5 | 5 Ton electro-hydraulic forging hammer | 1 |
| 6 | 8 Ton electro-hydraulic forging hammer | 1 |
| 7 | 12 Ton electro-hydraulic forging hammer | 1 |
| operation machine | ||
| 8 | 10 Ton loader machine | 1 |
| 9 | 15 Ton loader machine | 1 |
| 10 | 20 Ton Loader machine | 1 |
| Material carrier machine | ||
| 12 | 10 Ton material carrier | 1 |
| 13 | 20 Ton material carrier | 1 |
| 14 | Heat Treatment electric furnace 5Ton | 1 |
| 15 | Heat Treatment electric furnace 15Ton | 1 |
| 16 | Heat Treatment electric furnace 50Ton | 1 |
| 17 | Heat Treatment electric furnace 60Ton | 1 |
| 18 | Heat Treatment electric furnace 60Ton | 1 |
| 19 | horizontal lathe, vertical lathe,CNC vertical lathe,machining equipment | 31 |
Material Options:
42CrMo – A high-strength alloy steel with excellent toughness and hardenability, widely used for heavy-duty drive shafts.
42CrNiMo – A nickel-molybdenum alloy steel offering superior impact resistance and stability in harsh, low-temperature environments.
18CrNiMo – A carburizing alloy steel combining high surface wear resistance with strong core toughness, ideal for long-life gear shafts
Key Features:
Weight range: 100–1000KG
Available in various shapes: stepped shafts, spline shafts, solid or hollow structures
Forged and heat-treated for enhanced mechanical properties
CNC pre-machining or rough machining available upon request
100% Ultrasonic testing and Magnetic Particle Inspection
Applications:
Main shafts and input/output shafts in wind turbine gearboxes
High-torque drive components in renewable energy systems
Custom transmission shafts for planetary and parallel gear reducers
Offshore and onshore wind power equipment
Manufacturing Process:
The shafts are produced using open die forging or precision closed die forging, followed by appropriate heat treatment such as quenching & tempering or carburizing. Each part is processed to achieve optimized grain flow and superior fatigue resistance. All products are strictly inspected and can be delivered with pre-machined surfaces to facilitate your final assembly or finish machining.
The steel forgings production flow:
Raw material steel ingot into warehouse(test the chemical composition) → Cutting→ Heating(Furnace temperature test) → Heat treatment after forging(Furnace temperature test) Discharge the furnace(blank inspection)→ Machining→ Inspection(UT,MT,Visal dimension, hardness)→ QT→ Inspection(UT, mechanical properties, hardness, grain size)→ Finish machining→ Inspection (dimension)→ Packing and Marking(steel stamp, mark)→ Storage Shipment.
Why Choose Our Forged Steel Shafts?
✅ 25+ Years of Forging Expertise
✅ In-house Quality Control & Testing Lab
✅ ISO9001 / ISO14001 / ISO45001 Certified
✅ Reliable Partner of Top Gearbox Brands (Goldwind, NGC, ZPMC, etc.)
✅ Customized Dimensions & Tolerances Based on Drawings
High torsional strength & fatigue life
Optimized grain flow via precision forging
Crack-free forging surfaces
Enhanced mechanical reliability under extreme loads
Full traceability and quality documentation (MTC available)
Frequently Asked Questions (FAQs)
What is the typical weight spectrum of the forged components you manufacture? Our forging capabilities encompass a range of components weighing from 100 kilograms up to 7 metric tons.
Do you handle downstream processing such as thermal treatment and material removal? Indeed, we provide comprehensive in-house services for heat treatment, encompassing both preliminary and final machining operations.
Which industrial sectors are the primary beneficiaries of your forged products? We cater to a diverse array of critical industries, including wind power generation, heavy machinery manufacturing, port infrastructure, power transmission systems, and various others.
What are the typical timeframes for the completion and dispatch of orders? For items readily available in our inventory, the standard lead time is approximately 30 days. For custom-manufactured orders, the timeframe generally spans 40 to 45 days.
Could you provide information on the geographical location of your manufacturing facility and shipping hub? Our production plant is situated in Changzhou City, strategically located near Shanghai, and we utilize the Port of Shanghai for our shipping logistics.
Request a Quotation
To receive a tailored price assessment and a comprehensive engineering solution designed to meet your specific needs, please forward your detailed technical drawings and requirements to our dedicated team. Our experienced engineers will promptly review your submission and provide you with a professional quotation and a suitable solution.