42CrMo Forged Steel Hollow Cylinder in 100-7000kg Weight Range | Open Die Forging with Heat Treatment Option

Hollow Shaft Forgings :

Our forged hollow shafts are designed for high-performance applications where reduced weight and excellent torsional strength are critical. Manufactured through open die forging or customized mold forging, our hollow shafts offer superior mechanical properties, structural integrity, and dimensional precision.

We produce hollow shafts ranging from 100 kg to 7000 kg, with customized dimensions and internal diameters available upon request.

Key Features:

Our forged hollow shafts are designed for high-performance applications where reduced weight and excellent torsional strength are critical. Manufactured through open die forging or customized mold forging, our hollow shafts offer superior mechanical properties, structural integrity, and dimensional precision.

We produce hollow shafts ranging from 100 kg to 7000 kg, with customized dimensions and internal diameters available upon request.

About Our Forging Factory
With more than 30 years of forging experience, we are a leading manufacturer of open die and closed die forgings in China, focusing on components for industrial gearboxes, wind turbines, and port machinery. Our forging range covers parts from 100kg up to 7000kg, produced with 5T, 8T, and 12T electro-hydraulic hammers.

We are the largest long-term supplier to Nanjing High Speed Gear (NGC), providing high-performance gear shafts and blanks with stable quality. We are also the primary forged wheel supplier for ZPMC (Shanghai Zhenhua Port Machinery), with our products exported globally with ZPMC’s port equipment. In the wind energy sector, we supply forged components to leading companies such as Goldwind, Mingyang, and Southern Aerospace.

We operate a fully equipped in-house testing laboratory to ensure quality, and offer optional rough machining, heat treatment, and UT/MT inspections. Our manufacturing is certified under ISO 9001, ISO 14001, and ISO 45001 standards.

Forged Gear Shaft for Wind Turbine Quality Control

More products we are producing:

The steel forgings production flow:

We have our Own Inspection Lab:

These are the main inspection equipments:

We operate a fully equipped in-house laboratory dedicated to mechanical, chemical, and metallurgical testing. This allows us to perform real-time quality checks throughout the entire production process—from raw material selection to final inspection.

Our laboratory testing equipment includes:

Spectral Component Analyzer – for chemical composition analysis

Hydraulic Universal Testing Machine – for tensile and yield strength testing

Impact Strength Testing Machine with Cryogenic Tank – for room temperature and low-temperature impact testing

Brinell & Rockwell Hardness Testers – to assess surface and core hardness

Ultrasonic Flaw Detector – for internal defect detection (UT)

Metallurgical Microscope – for grain structure and heat treatment evaluation

Program-Controlled Box Furnace – for heat treatment simulations and metallurgical testing

Our Steel Forgings application:

Industrial applications

We apply our years of experience and unique professionalism, taking into account the specific requirements of the market, to design and manufacture forged parts for all industrial sectors. This makes Tiangong Forging a leader in the forging industry and sincerely cooperates with leading companies in various industrial fields.

A. Wind power generation

B. Port heavy machinery

C. Mining

D. Ship building

E. Chemical industry

F. Petroleum industry

G. Metallurgy industry

H. Hydraulic industry

I. Other manufacturing industries of various industrial equipment, transmission gear box, parts and etc.

Key Figures

A. More than 25 years of professional free forging and open-die forging manufacturing experience

B. The company covers an area of 71,000 square meters

C. The construction area of the production workshop is 12,000 square meters

D. Total number of employees: 158

E. 28 engineering and technical personnel

F. 59 skilled workers

G. Annual production capacity is 38,000 tons

H. Annual raw material steel throughput turnover reaches 56,000 tons.

Frequently Asked Questions (FAQs)

1. What is your minimum and maximum forging weight?
   We produce forged components ranging from 100kg to 7000kg.

2. Can you provide heat treatment and machining services?
   Yes, we offer full in-house heat treatment and rough/final machining.

3. What industries do you serve?
   Wind energy, heavy machinery, port equipment, power transmission, and more.

4. What is the lead time of your production?

If we have material in stock, lead time is around 30 days. If no material in stock, around 40-45 days.

5. Where are you located?

Our factory located in Changzhou City, Neaby Shanghai. Our nearest port is Shanghai Port.

Please send us the drawings and technique requirements, we will quote you soon.

About CHANGZHOU TIANGONG 

We are a Chinese company with over 30 years of forging experience. Our focus lies in the production of machine free forged products. We take pride in our independent quality assurance laboratory, which ensures that all our products meet our customers’ requirements. 

Our customers and partner value our products and services for 2 reasons: excellence and reliability.

Key figures 

A. Over 30 years professional free forging manufacturing experience

B. The company covers an area of 71,000 square meters

C. The construction area of the production workshop is 12,000 square meters

D. Total number of employees of 158

E. 28 engineering and technical personnel 

F. 59 skilled workers 

G. Annual production capacity is 38,000 tons

H. Steel throughput can reach 56,000 tons

Efficient and reliable solutions for customers

Industrial sector application

We design and manufacture forged parts for all industrial areas applying our experience and unique professionalism and taking the specific requirements of the markets into account. This has led us to become a forging industry leader in all industrial segments and collaborating with leading companies.

A. Wind power generation

B. Port Heavy Machinery

C. Mining

D. Ship Building

E. Chemical industrial

F. Oil industrial

G. Metallurgical industry 

H. Hydraulic industry 

I. Other high-end industrial equipment, gearbox body, parts and etc.

Customized solutions 

Modular processes allow us to engineer a solution for almost every industrial application requiring free forged parts. Our modularity means flexibility, a wide range of options, faster delivery, and most important of all, competitiveness.

All our products and production process have been designed to assure excellent, reliable and long lasting unique mechanical performances, resulting in reduced operating costs and long life.

With a wide range of products and a significant experience gained in most industrial applications, we can also provide complete engineering recommendation for customers.