Alleima Sanicro 35-HS Alloy Gained Industry Acceptance
The new material provides subsea fasteners with high strength and corrosion resistance.
Updated on Sept. 21, 2026 in Materials Science
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Alleima has secured multiple international standard certifications for its Sanicro 35-HS alloy, clearing the material for use in subsea fastener applications. This development confirms the alloy's ability to maintain structural integrity under extreme conditions.
Why it matters
The alloy offers a lower-cost alternative to traditional nickel-base materials while maintaining high-performance thresholds. Its adoption addresses the industry demand for fasteners that resist hydrogen embrittlement in demanding subsea environments.
Sanicro 35-HS achieves a cold working strength of 180 ksi while demonstrating superior elongation and impact toughness compared to Alloy 718. It is now accepted under ASME code case 2982 and the NACE MR0175/ISO 15156-3 standard for sour service.
The players
Alleima
A developer of high-value alloys and stainless steel products focused on materials for harsh industrial environments.
The details
The alloy is engineered to resist hydrogen-induced stress cracking, a failure mode where hydrogen atoms permeate metal, causing brittleness and sudden fractures in high-pressure environments. Through two years of qualification trials, the material proved it could withstand localized corrosion better than existing standard options. The material relies on precise metallurgical composition to balance ductility and high-stress load-bearing capacity.
Timeline
2024-2026: Qualification programs were conducted with OEMs and universities.
2027: Potential first field installations could occur.
The Tech Race
The certification under ASME code case 2982 validates Sanicro 35-HS as a competitive replacement for Alloy 718. This transition marks a significant shift in the subsea hardware market toward materials that optimize cost without sacrificing endurance.
Engineers and manufacturers can begin planning for the integration of this material as a lower-cost alternative in upcoming subsea projects. First field installations are expected to begin in 2027, provided the current regulatory progress remains on schedule.
The takeaway
Sanicro 35-HS provides a critical balance of corrosion resistance and high-tensile strength for subsea fasteners. Watch for upcoming announcements regarding the successful integration of the material into the NORSOK and API standards, which will signal its readiness for large-scale field deployment.
What happens next
Industry participants should track the pending inclusion of the alloy in NORSOK M630 and API 6A standards, as these remain the final hurdles for widespread adoption in offshore infrastructure.
Further reading
For more on evolving industrial standards, visit Materials Science.
Source note: This article includes information reported by Offshore.
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