English 
T: +86-156-0511-1716
E: hp018@hpcbkj.com
E: hp018@hpcbkj.com
In Fangong Industrial Park, Dongtai Town, Dongtai City
The Marine-Grade Stainless Steel Stern Shaft is the core power-transmission component of marine propulsion systems, connecting the ship’s engine to the propeller.
| Quantity: | |
|---|---|
Made primarily from 316L marine-grade stainless steel (with 45-grade carbon steel and 40Cr alloy steel options), it is built to withstand seawater corrosion, high torque loads, and cyclic vibrations. This stern shaft boosts propulsion system durability, making it ideal for ocean-going ships, coastal vessels, and fishing boats.
Exceptional Seawater Corrosion Resistance: 316L stainless steel’s molybdenum (2-3%) and chromium (16-18%) content prevents pitting/crevice corrosion in saltwater.
High Strength & Fatigue Resistance: Resists cracking at stress zones (tapers, keyways) caused by vibration, ensuring long-term structural integrity.
Cost Versatility: Offers material options to balance performance and budget (316L for harsh seas, carbon steel for inland/coastal use).
Low Maintenance: Smooth surface finish and corrosion resistance reduce cleaning/repair needs, lowering lifecycle costs by 25%.
Parameter | 316L Stainless Steel (Marine-Grade) | 45-Grade Carbon Steel | 40Cr Alloy Steel |
Material Grade | 316L | 45# | 40Cr |
Diameter Range | 50mm - 500mm (customizable) | 50mm - 600mm (customizable) | 50mm - 550mm (customizable) |
Length | Up to 10m (customizable) | Up to 12m (customizable) | Up to 11m (customizable) |
Tensile Strength | ≥ 550 MPa | ≥ 600 MPa | ≥ 800 MPa |
Yield Strength | ≥ 205 MPa | ≥ 355 MPa | ≥ 650 MPa |
Corrosion Resistance | Excellent (seawater/salt spray) | Good (needs galvanization) | Good (needs epoxy coating) |
Hardness (Brinell) | HB 130 - 180 | HB 190 - 230 | HB 220 - 250 |
Applicable Vessels | Ocean-going ships, offshore platforms | Coastal/inland ships, small cargo boats | Patrol boats, high-torque cargo ships |
Advanced Material Engineering: 316L stainless steel is alloyed with molybdenum to resist chloride-induced corrosion—critical for 5+ years of open-sea service.
Precision Machining: Uses CNC turning/grinding to achieve tight tolerances (±0.05mm for diameter) and a smooth surface (Ra ≤ 0.4μm), reducing wear on stern tube bearings/seals.
Stress Optimization: Tapers and keyways have rounded transitions and heat treatment to eliminate stress risers, preventing fatigue cracking.
Traceable Quality: Each shaft comes with a Material Test Report (MTR) complying with ABS/DNV GL/LR marine standards.
Ocean-Going Container Ships: 316L variant resists long-term saltwater corrosion during transoceanic voyages and handles high torque for continuous propulsion.
Coastal Patrol Boats: 40Cr alloy steel variant offers enhanced strength for high-speed maneuvers and vibration resistance, with epoxy coating to protect against salt spray.
Inland Fishing Boats: 45-grade carbon steel variant provides cost-effectiveness for budget projects, with galvanization to prevent corrosion in freshwater/coastal waters.
Our 316L stainless steel is sourced from certified suppliers, with strict chemical testing to ensure molybdenum/chromium content meets standards. The manufacturing process includes:
Forging: Raw material is forged to improve grain structure and eliminate internal defects;
Heat Treatment: Normalization/tempering enhances toughness (critical for alloy steel);
CNC Machining: Shapes diameter, tapers, and keyways, with in-process checks for accuracy;
Surface Treatment: 316L gets passivation; carbon steel/40Cr get galvanization/epoxy coating.
The stern shaft is designed to integrate seamlessly with stern tube seals, bearings, and propeller shafts. Its length/diameter are customized to match engine power and propeller size—ensuring 98% power transmission efficiency. End connections (flanges, tapers) are precision machined for tight fitting, reducing vibration and noise during operation.
Conducts ultrasonic flaw detection (internal defects), tensile testing (strength verification), and 1,000-hour salt spray testing (316L variant);
Provides ABS/DNV GL certification for ship classification society approval.
Offers on-site calibration to align the shaft with the engine/propeller, reducing misalignment-induced wear;
Optional IoT monitoring: Integrates temperature/vibration/wear sensors for real-time data and predictive maintenance alerts.
24-month warranty for 316L shafts (12 months for carbon steel/40Cr);
Scheduled maintenance plans (inspection, cleaning, seal checks);
Emergency replacement parts delivered within 72 hours to minimize ship downtime.
