Overview
ISO 18742:2026 sets requirements for high-manganese austenitic steel welded fittings designed for cryogenic temperature, specifically for use in ship and marine technology, as well as onshore projects. This International Standard focuses on welded fittings used in pressure piping subjected to extremely low temperatures, ensuring safety, mechanical performance, and durability. The document is applicable to all pressure-retaining and non-pressure retaining components in hull systems and piping for cargo tanks, fuel tanks, and systems designed for liquefied gases, including applications involving liquefied hydrogen.
Key Topics
Applications
ISO 18742:2026 is essential for industries involved in:
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Shipbuilding and Marine Technology
- Design and fabrication of cryogenic tanks and pressure piping systems for LNG and alternative fuel vessels.
- Safety-critical hull and piping systems for liquefied gas carriers and bunkering solutions.
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Onshore Cryogenic Projects
- Piping systems in LNG terminals, storage tanks, and facilities handling cryogenic fluids such as hydrogen.
- Industrial plants requiring reliable, high-strength welded fittings for low temperature service.
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Manufacturing and Supply Chain
- Steel mills, fabricators, and suppliers of austenitic welded fittings for marine and cryogenic piping.
- Inspection and certification bodies verifying compliance with international standards.
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Advanced Fuels and Energy Infrastructure
- Applications in renewable fuel supply chains, such as hydrogen transport and storage under extreme cold.
Related Standards
ISO 18742 references and aligns with several existing international and sector-specific standards to ensure interoperability and broad acceptance:
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ISO Standards
- ISO 148-1: Metallic materials - Charpy impact test
- ISO 2566: Steel - Conversion of elongation values
- ISO 3452-1: Non-destructive testing - Penetrant testing
- ISO 6892-1: Tensile testing at room temperature
- ISO 9606-1: Qualification testing of welders
- ISO 15609-1/15614-1: Welding procedure specifications and qualification
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ASME & ASTM Standards
- ASME B16.9/B16.28: Factory-made wrought steel buttwelding fittings
- ASME B31.3: Process piping
- ASME Boiler and Pressure Vessel Code, Section VIII
- ASTM A960/960M: Steel piping fittings general requirements
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Safety Codes
- IGC Code: International Code for Construction and Equipment of Ships Carrying Liquefied Gases in Bulk
- IGF Code: International Code of Safety for Ships using Gases or other Low-flashpoint Fuels
Summary
ISO 18742:2026 provides a comprehensive technical foundation for the procurement, manufacture, and inspection of high-manganese austenitic steel welded fittings for cryogenic service in shipbuilding and onshore applications. This standard enhances safety, reliability, and regulatory compliance in critical cryogenic piping systems by standardizing material performance, manufacturing processes, inspection, and testing methods. Its integration with key ISO, ASME, and ASTM standards ensures international applicability in the global marine and energy supply chains.