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China factory - Changzhou Tiangong Forging Co., Ltd.

Changzhou Tiangong Forging Co., Ltd.

  • China,Changzhou ,Jiangsu
  • Verified Supplier

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China 42CrMo4 Free Forging High Strength Marine Propeller Shaft For Ship Drive Systems
China 42CrMo4 Free Forging High Strength Marine Propeller Shaft For Ship Drive Systems

  1. China 42CrMo4 Free Forging High Strength Marine Propeller Shaft For Ship Drive Systems
  2. China 42CrMo4 Free Forging High Strength Marine Propeller Shaft For Ship Drive Systems
  3. China 42CrMo4 Free Forging High Strength Marine Propeller Shaft For Ship Drive Systems

42CrMo4 Free Forging High Strength Marine Propeller Shaft For Ship Drive Systems

  1. MOQ: 1
  2. Price: USD500-USD1000/piece
  3. Get Latest Price
Payment Terms T/T
Supply Ability 56000 Tons per year
Delivery Time 30days
Packaging Details Pallet
Surface Treatment Heat Treatment,Removal of oxide scale
Size Customized according to customer requirements
Material Alloy Steel or Customized
Weight 100 KG-7 TON
Type Free Forging
Application Machinery, Automotive, Mining, Construction
Processing Method 42CrMo4 or Customized
Packing Pallet or Customized
Brand Name Tian Gong
Certification ISO9001, ISO14001,ISO45001
Place of Origin Changzhou, China

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  1. Product Details
  2. Company Details

Product Specification

Payment Terms T/T Supply Ability 56000 Tons per year
Delivery Time 30days Packaging Details Pallet
Surface Treatment Heat Treatment,Removal of oxide scale Size Customized according to customer requirements
Material Alloy Steel or Customized Weight 100 KG-7 TON
Type Free Forging Application Machinery, Automotive, Mining, Construction
Processing Method 42CrMo4 or Customized Packing Pallet or Customized
Brand Name Tian Gong Certification ISO9001, ISO14001,ISO45001
Place of Origin Changzhou, China
High Light 42CrMo4 Free forgingFree forging High StrengthMarine Propeller Shaft for Ship

42CrMo4 High-Strength Marine Propeller Shaft Free Forging for Ship Drive Systems. The 42CrMo4 High-Strength Marine Propeller Shaft Free Forging is a large open-die forged shaft designed for marine propulsion systems in commercial vessels and offshore ships. It transmits torque from the engine to the propeller, ensuring reliable performance under continuous torsional load and harsh seawater exposure.

 

Manufactured from 42CrMo4 alloy steel, this forging offers excellent tensile strength, fatigue resistance, and impact toughness, while maintaining dimensional stability during long-term operation. The forging process ensures directional grain flow along the shaft axis, enhancing mechanical integrity under bending and torque stress.

Key Features

  • Forged from premium alloy or stainless steels such as 42CrMo4

  • Customizable dimensions, with solid or hollow shafts, keyways, taper ends, or flanges

  • Ultrasonic tested, machined, and optionally surface-coated for marine use

Available Types include:

  • Solid marine propeller shafts for heavy-duty propulsion systems

  • Hollow propeller shafts for optimized weight and dynamic balance

  • Stern tube shafts with machined bearing surfaces

  • Intermediate drive shafts with customized coupling ends and flanges

Item Details
Product Name 42CrMo4 High-Strength Marine Propeller Shaft Free Forging for Ship Drive Systems
Material Grades - Marine-grade alloy steels: 42CrMo4
Forging Equipment - Hydraulic hammers: 5T / 8T / 12T - 3600T open-die forging press for long-axis and large-diameter shaft forging - Supports integrated forging of stepped and flanged shaft sections
Manufacturing Process Hot Forging → Normalizing / Quenching + Tempering → Ultrasonic Testing → Rough / Semi-Finish Machining → Dimensional & Surface Inspection
Forging Ratio ≥ 3.0 — Enhances grain orientation along shaft axis, improving fatigue performance and structural integrity under bending and torsional vibration
Applications - Main propeller shafts for cargo ships, ferries, tugboats, and naval vessels - Intermediate drive shafts for marine transmission systems - Stern shafts operating in seawater or lubricated bearing systems
Heat Treatment Options - Quenched + Tempered for strength and ductility in 42CrMo4 - Solution annealed + aged for stainless materials 
Testing & Inspection - Chemical: Spectrometer verification of alloy composition - Mechanical: Hardness, tensile, yield, impact testing (transverse & axial) - Ultrasonic (UT): Full-length, multi-angle flaw detection - Dimensional: Journal roundness, straightness, concentricity, length, and runout control
Value-Added Services - Pre-machining: taper ends, flanges, journals, keyways, sealing interfaces - End protection caps, steel banding, seaworthy packaging - Full material traceability: heat number, forging batch, inspection certificate

 

Key Features

  • Forged from premium alloy or stainless steels such as 42CrMo4, 34CrNiMo6, or F51

  • Excellent fatigue strength, torsional rigidity, and corrosion resistance

  • Customizable dimensions, with solid or hollow shafts, keyways, taper ends, or flanges

  • Ultrasonic tested, machined, and optionally surface-coated for marine use

Available Types include:

  • Solid marine propeller shafts for heavy-duty propulsion systems

  • Hollow propeller shafts for optimized weight and dynamic balance

  • Stern tube shafts with machined bearing surfaces

  • Intermediate drive shafts with customized coupling ends and flanges

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.

Packaging & Delivery
Rust-preventive coating

Heavy-duty seaworthy wooden boxes

Custom labeling and barcoding

Global shipping support with flexible delivery terms (FOB, CIF, EXW)

 

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.

Company Details

Bronze Gleitlager

,

Bronze Sleeve Bushings

 and 

Graphite Plugged Bushings

 from Quality China Factory
  • Business Type:

    Manufacturer,Exporter,Seller

  • Year Established:

    1994

  • Total Annual:

    27.5 million -28 million

  • Employee Number:

    135~150

  • Ecer Certification:

    Verified Supplier

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 ... 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 ...

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  • Changzhou Tiangong Forging Co., Ltd.
  • Wangxia Village, Luoxi Town, Xuejia Town, Xin Bei District, Changzhou City, Jiangsu Province, China
  • https://www.freeforgings.com/

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