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

Product Specification

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

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.