From relying on imports to breaking the monopoly
Against the backdrop of the in-depth advancement of initiatives to build a manufacturing powerhouse and a maritime power, alongside the accelerated global shift of the shipping industry toward green and low-carbon development, the shipbuilding industry has emerged as a crucial indicator for gauging a country’s high-end manufacturing capabilities. As the core vital component that determines a vessel’s sailing speed, energy consumption and environmental performance, marine propellers constitute a cornerstone for securing independent and controllable development across the entire ship industrial chain, as well as a pivotal field driving the green upgrading of global marine power systems. For a long time, the high-end marine propeller market in China has been monopolized by a handful of international conglomerates, with core technologies and market dominance held by foreign entities. This has long served as a key technological bottleneck hindering the high-quality development of China’s shipbuilding industry. Through decades of independent research and breakthrough efforts, China has achieved groundbreaking progress in the domestic substitution of marine propellers. A number of domestic enterprises have forged strong breakthroughs in this sector previously dominated by international giants, laying a solid foundation for realizing full-chain independence and self-sufficiency within the shipbuilding industry.
I. Ship Propellers: The Overlooked Core Bottleneck Component Restricting Ship Development
Many people only have a simplistic impression of ship propellers as just "several copper blades". In reality, the research, development and manufacturing of ship propellers integrate extremely complex hydrodynamic design, precision casting and high-end processing technologies, making them bona fide high-end industrial products. The design of a propeller directly determines a vessel's propulsion efficiency; even tiny deviations in precision can exert a direct impact on the ship's sailing efficiency and energy consumption performance. A single propeller for a large container ship usually weighs dozens of tons, yet the contour error of its blade surface is required to be no more than 0.1 millimeters, with manufacturing precision standards far exceeding those for ordinary mechanical parts.
Since the reform and opening-up policy was launched, China's shipbuilding industry has achieved rapid growth. For consecutive years, the country has ranked first worldwide in terms of completed ship output, newly received ship orders and outstanding ship orders, emerging as the world's largest shipbuilding nation. Nevertheless, the sector has long suffered from the predicament of being "large in scale yet not strong in core competitiveness" when it comes to key supporting components, and the high-end ship propeller market has long been monopolized by a small number of international giants from Germany, Japan, South Korea and other countries. Before breakthroughs in domestic substitution, propellers for large container ships, very large crude carriers, high-end ro-ro passenger ships and other vessels built domestically in China were mostly imported. This not only incurred exorbitant procurement costs but also left delivery cycles firmly under the control of overseas manufacturers. Any fluctuations in the supply chain would directly delay the overall ship construction schedule.
Beyond design and manufacturing techniques, the high-end testing and processing equipment required for propeller production also relied heavily on imports for a long time. Previously, domestic propeller manufacturers purchased nearly all their key measuring equipment and large-scale processing machinery from overseas suppliers. Apart from steep procurement expenses, subsequent maintenance and upgrades were subject to technological blockades by foreign enterprises. Industry statistics indicate that prior to the advancement of domestic substitution, China's import dependency rate for high-end ship propellers exceeded 70 percent, with the majority of the domestic market share captured by overseas conglomerates. Local enterprises were confined to homogeneous competition in the mid-to-low-end market segments, facing drastically squeezed profit margins. This reliance on imported core components has not only restricted the profitability of China's shipbuilding industry but also posed potential risks to the security of the entire shipbuilding industrial chain and supply chain. Therefore, realizing independent research and development as well as domestic substitution for ship propellers has become an indispensable milestone to conquer for advancing the high-quality development of China's shipbuilding industry.
II. Forging Ahead through Independent Research: Domestic Enterprises Breaking the Blockade on Core Technologies
Faced with industry pain points including the blockade of core technologies by foreign countries, reliance on imported high-end testing and processing equipment, and intensifying homogeneous low-end competition, domestic Chinese propeller enterprises have rejected the follow-up development path of "introduction, digestion, absorption and re-innovation". Instead, they take independent controllability of core technologies as the key to seizing market opportunities, tackle bottleneck technologies head-on, and forge an entirely self-developed path for domestic substitution.
Zhenjiang Tongzhou Propeller Co., Ltd. is a representative domestic enterprise specializing in the independent development of marine propellers. Founded in 2005, the company has dedicated itself to the segmented field of high-precision energy-saving marine propulsion systems for two decades, prioritizing the independent control of core technologies in its development. Propeller measurement is widely acknowledged as a critical technological bottleneck across the industry. Committed to breaking this deadlock through indigenous innovation, Tongzhou Propeller has successfully developed China’s first large-scale automatic laser measuring equipment for propeller blades in the industry, fully replacing equivalent top-tier foreign products and fundamentally eliminating reliance on imported high-end measuring devices. Building on this achievement, the enterprise pioneered robotic processing technology for large propellers in China and put it into large-scale application. This breakthrough dismantled foreign technological barriers, filled gaps in the domestic industrial sector, and secured independent control over core production equipment and processing techniques.
Having resolved the bottlenecks plaguing production equipment, Tongzhou Propeller turned its focus to the core demand for green transformation within the global shipping industry. It has carried out in-depth collaborative research with China’s leading universities to systematically optimize the structures of propellers, guide wheels and vortex elimination fins, developing high-precision energy-saving marine propulsion systems with fully independent intellectual property rights. Test results demonstrate that this self-developed propulsion system can cut the energy consumption of operational vessels by 8% to 10%, fully complying with the EEXI energy efficiency standards and the International Maritime Organization (IMO)’s requirements for ship energy efficiency and emissions, and precisely catering to domestic shipping companies’ core needs for green and low-carbon upgrading. By 2026, the enterprise has built a technological moat consisting of 44 valid patents. It has been awarded prestigious honors such as the National Marine Science and Technology Progress Award, undertaken multiple national special research and development programs, and been recognized as a national-level Specialized, Refined, Characteristic and Innovative "Little Giant" Enterprise, emerging as a benchmark for the domestic substitution of marine propellers.
Beyond private enterprises, major domestic shipbuilding conglomerates are also accelerating their layout in the independent development of marine propellers. Affiliated enterprises under China State Shipbuilding Corporation have made breakthroughs in the independent design and manufacturing technologies for high-end products including propellers for ultra-large container ships and LNG carriers in recent years, realizing domestic substitution of core products and ending overseas manufacturers’ monopoly over the high-end market. At present, China has established a complete independent industrial chain covering basic research, design, casting, processing and inspection, with the capacity to independently supply marine propellers for all vessel types.
III. Remarkable Achievements in Domestic Substitution: Steady Growth in Market Share
With breakthroughs in core technologies, domestic ship propellers have gained growing market recognition, and the market share of local enterprises has climbed steadily. Zhenjiang Tongzhou Propeller Co., Ltd. boasts the most representative market statistics. In 2024, the company secured a 19.63% national market share for its high-precision energy-saving marine propulsion systems, which rose further to 26.55% in 2025, placing it firmly within the first echelon of the domestic segmented market. The rapid surge in market share stems from market recognition of the quality of domestic propeller products.
The most immediate change brought by domestic substitution is the reduction in procurement costs. Previously, an imported propeller for a large container ship usually cost over ten million yuan, with a delivery cycle stretching 6 to 8 months. Following technological breakthroughs in domestic propellers, procurement prices have dropped by more than 30%, and delivery cycles have been shortened to less than three months, greatly easing the cost burden on shipbuilders and shortening ship construction periods. A procurement manager from a leading domestic shipbuilding enterprise stated that high-end propellers were entirely reliant on imports in the past. The company had no bargaining power over pricing, and in the event of quality defects, after-sales maintenance had to wait for technicians dispatched by overseas manufacturers. Thanks to domestic substitution, costs have been cut, service response speed has been drastically improved, and overall competitiveness has been markedly strengthened.
While achieving progress in the commercial ship market, domestic propellers have also realized independent supply for special-purpose vessels. Zhenjiang Tongzhou Propeller is the only private enterprise in China qualified to manufacture military-grade propellers. It supplies core components for domestic special ships in strict accordance with military quality standards, breaking the previous pattern whereby propellers for special vessels were solely provided by state-owned enterprises and enhancing the independent support capacity of the industrial chain for special ships. At present, domestic ship propellers cover the full spectrum of vessel types, including inland waterway ships, coastal bulk carriers, very large crude carriers, large container ships, LNG carriers, high-end ro-ro passenger ships and special-purpose vessels. Domestic substitution has basically been accomplished in the mid-to-high-end market, with import dependence falling from over 70% previously to less than 20% today, marking a phased victory for domestic substitution efforts.
The growing market share has in turn driven a virtuous cycle of corporate R&D investment. As domestic propellers win wider market acceptance, local enterprises enjoy rising profitability, granting them more capital to invest in new product development and further technological upgrades, thereby forming a positive loop: market expansion → profit growth → increased R&D spending → technological advancement. Statistics indicate that leading domestic propeller enterprises allocate over 8% of their operating revenue to research and development, exceeding the average level of China's manufacturing sector and laying a solid foundation for sustained technological innovation.
IV. Quality First: Build a Moat in the Market Through Exquisite Craftsmanship
As the core component of ships, marine propellers have product quality that is directly tied to ship navigation safety; even the tiniest quality defect may lead to catastrophic consequences. Therefore, achieving technological breakthroughs is merely the first step in domestic substitution, and earning long-term market trust hinges on supreme product quality. In advancing domestic substitution, local propeller enterprises consistently prioritize quality and build a moat for market competition through stringent full-process quality control.
Since its establishment, Zhenjiang Tongzhou Propeller has targeted the niche track of high-precision energy-saving marine propulsion systems, embedding the two core requirements of "high precision" and "energy efficiency" into its corporate development DNA. For two decades, the enterprise has wholeheartedly focused on refining propellers without chasing short-term market trends. It delves deep into the technical fields of fluid mechanics and precision manufacturing, integrating utmost dedication to its core business and relentless pursuit of quality into the entire workflow of each propeller blade, spanning design, casting, machining and inspection. The company has set up a full-process quality management system, with multiple quality inspections deployed at every stage from raw material incoming inspection to finished product delivery, guaranteeing every delivered propeller complies with the highest quality standards.
Rigorous quality control has earned domestic propellers recognition from the world's leading classification societies. At present, products from leading local enterprises have obtained certifications from ten top global classification societies including China Classification Society (CCS), American Bureau of Shipping (ABS) and Lloyd's Register (LR), securing the credentials to compete in domestic and international markets and laying a solid foundation for domestic propellers to go global. Within the global shipping industry, classification society certification is a mandatory prerequisite for ship classification and navigation. Acquiring certifications from the world’s ten authoritative classification societies verifies that domestic propellers have reached internationally advanced quality standards and gained worldwide industry acknowledgment.
Persistent commitment to quality has also helped local enterprises build irreplaceable brand credibility. Nowadays, major domestic shipbuilding companies have basically realized localized supporting supply of propellers for mainstream vessel types, and the installation volume of domestic propellers has surpassed that of imported counterparts. Validated through years of practical navigation operations, domestic propellers have won shipowners’ approval for their reliability and energy-saving performance. An increasing number of shipping enterprises voluntarily opt for domestic propellers when constructing new vessels. The person in charge of a private shipping enterprise stated that the company previously exclusively specified imported propellers for new ships. However, after practical comparative application, domestic propellers show no notable gaps against imported ones in propulsion efficiency and energy consumption, while boasting lower prices and superior after-sales services. The enterprise now fully adopts domestic propellers for all newly built ships.
