Alleima Validated New Alloy for Subsea Fasteners
The Sanicro 35-HS alloy has passed international standards for use in demanding subsea environments.
Updated on Sept. 21, 2026 in Materials Science
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Materials manufacturer Alleima has successfully validated its Sanicro 35-HS alloy for subsea fastener applications. The alloy maintains high strength and corrosion resistance after two years of testing.
Why it matters
The material provides a more cost-effective alternative to traditional nickel-base alloys while resisting hydrogen-induced stress cracking. Its validation allows for higher performance in corrosive subsea conditions.
The Sanicro 35-HS alloy maintains corrosion resistance and impact toughness after cold working to 180 ksi. It outperforms Alloy 718 in elongation metrics while meeting global regulatory requirements.
The players
Alleima
Alleima is a global manufacturer of high-value-added products in advanced stainless steels and special alloys.
The details
The alloy successfully completed two years of qualification programs involving universities, original equipment manufacturers, and end users. It has secured formal acceptance under ASME code case 2982, NACE MR0175/ISO 15156-3, and other global pressure equipment directives.
Timeline
Qualification programs took place between 2024 and 2026.
First field installations are anticipated in 2027.
The Big Picture
This development represents an evolution in materials science for extreme-environment applications by aligning new metallurgy with established safety frameworks like ASME code case 2982. It shifts the industry toward high-strength, cost-optimized materials that meet standardized reliability thresholds.
The introduction of this alloy could lower maintenance and replacement costs for subsea infrastructure by providing a more durable, lower-cost alternative to legacy nickel-base fasteners. This may lead to improved operational longevity for offshore energy projects starting in 2027.
The takeaway
The successful validation of Sanicro 35-HS highlights how targeted metallurgical research can improve the performance of critical subsea components. Engineers and project managers should monitor future updates regarding the alloy's integration into broader API and NORSOK industry standards.
What happens next
The company expects to secure inclusion in the NORSOK M630 and API 6A industry standards, with potential field implementation beginning in 2027.
Further reading
Learn more about the latest innovations in Materials Science.
Source note: This article includes information reported by Offshore.
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