Steel and mooring chains
A balanced steel composition with controlled In, Si, and Al content, along with optional additives, enhances corrosion resistance and toughness in mooring chains, addressing the corrosion issues while maintaining mechanical integrity.
JP2026120041APending Publication Date: 2026-07-21NIPPON STEEL CORPORATION
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Patent Information
- Authority / Receiving Office
- JP Β· JP
- Patent Type
- Applications
- Current Assignee / Owner
- NIPPON STEEL CORPORATION
- Filing Date
- 2025-01-08
- Publication Date
- 2026-07-21
AI Technical Summary
Technical Problem
Mooring chains are susceptible to severe corrosion due to their exposure to seawater, leading to a shortened lifespan and the need for frequent replacement, despite existing corrosion-resistant steels compromising toughness when In content is increased.
Method used
A steel composition with controlled ratios of In, Si, Al, and O, along with optional additives, ensuring both excellent corrosion resistance and toughness by balancing solid-solution In and In oxide content, and optionally incorporating a corrosion-resistant coating.
Benefits of technology
The steel exhibits superior corrosion resistance and toughness, meeting mechanical requirements for mooring chains with reduced diameter loss and improved durability.
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Smart Images
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Abstract
To provide steel for mooring chains and mooring chains with excellent corrosion resistance and toughness. [Solution] A steel for mooring chains having a chemical composition in mass%, of C: 0.15~0.45%, Si: 0.60% or less, Mn: 1.00~2.50%, P: 0.100% or less, S: 0.050% or less, Al: 0.100% or less, N: 0.0100% or less, O: 0.0005~0.0060%, In: 0.005~0.200%, the remainder being Fe and impurities, and satisfying 50 β€ (0.7 Γ In + 0.9 Γ Si + 1.1 Γ Al) / O β€ 300.
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