Marine Hardware: A Precision Casting Compliance Strategy for Meeting Different Classification Society Certifications

In the shipbuilding industry, marine hardware serves as a critical component for connecting cabin structures and securing equipment. Its quality directly impacts vessel safety and service life. The certification requirements of different classification societies set multiple challenges for precision casting processes, making a precise grasp of compliance points essential for precision casting manufacturers to establish a foothold in the market.

Take the China Classification Society (CCS) for example. It imposes strict material requirements for marine hardware. For hardware used in critical areas such as rudder horns, specific steels like G20Mn5 must be employed, with sulfur and phosphorus content in the chemical composition kept at low levels to prevent brittleness and fractures caused by impurities. Additionally, the heat treatment process must involve normalization and tempering to ensure the material’s mechanical properties meet the standards.

The Norwegian classification society, DNV GL, places greater emphasis on non-destructive testing standards. The surfaces of marine hardware must undergo 100% precision grinding and polishing, magnetic particle inspection must meet a Grade 3 acceptance level, and ultrasonic testing for areas like shaft holes must achieve Grade 2 or higher. This drives casting enterprises to optimize riser design, prolong solidification time through insulating risers, and minimize internal defects.

Facing diverse certification systems, manufacturers need to establish a “one product, multiple standards” production model. From mold design to pouring processes, flexibility must be incorporated. For instance, to meet the dimensional tolerance requirements of different classification societies, CNC machining can be utilized in stages to ensure the precision of marine hardware complies with regulations.

With over 20 years of professional casting experience, Qingdao Tianheyuan employs silica sol investment casting technology and currently produces over 1,300 tons of castings annually. Most of our products are directly exported to regions such as Europe, North America, Japan, and South Korea. For more information about marine hardware, please feel free to contact us.

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