ISO 18741:2026 PDF

Ship and marine technology — High-manganese austenitic steel — Specification for high-manganese austenitic steel forgings for cryogenic temperature

Название (английский):

ISO 18741:2026

Ship and marine technology — High-manganese austenitic steel — Specification for high-manganese austenitic steel forgings for cryogenic temperature

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 12
Дата публикации:: 6 февраля 2026 г.
Издание:: ISO IS 18741 edition 1 version 1
ICS:: 47.020.05

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This document specifies minimum requirements for high-manganese austenitic steel forgings for valves, flanges, fittings and other pressure-containing components used at cryogenic temperature. The specification of high-manganese austenitic steel forgings can be applicable to all pressure retaining components and any non-pressure retaining component.

Технические детали

Технический комитет: ISO/TC 8/SC 4 - Outfitting and deck machinery
SKU: ISO 18741:2026

Abstract

Overview

ISO 18741:2026 defines the minimum requirements for high-manganese austenitic steel forgings used in ship and marine technology, specifically for valves, flanges, fittings, and other pressure-containing components that operate at cryogenic temperatures. This international standard ensures that both pressure-retaining and non-pressure-retaining components meet stringent material, manufacturing, and quality criteria, supporting the safe and reliable use of these materials in challenging cryogenic environments.

High-manganese austenitic steel exhibits excellent combination of toughness and mechanical strength at extremely low temperatures, making it highly suitable for marine applications such as cargo and fuel tanks, piping systems, and fittings involved in the transport and storage of liquefied gases.

Key Topics

Scope and Applicability
- Covers all types of shipboard and marine components exposed to cryogenic conditions, including both pressure- and non-pressure retaining parts.
- Aligns with requirements relevant to the IGC Code (International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk) and the IGF Code (International Code of Safety for Ships using Gases or other Low-flashpoint Fuels).
Material Specification
- Sets strict requirements for the chemical composition of high-manganese austenitic steel forgings, ensuring consistency and reliability.
- Includes clear guidelines for allowable ranges of key elements (e.g., manganese, carbon) and handling of residual or additional elements.
Manufacturing and Heat Treatment
- Outlines approved methods for steelmaking (e.g., electric furnace, open hearth) and necessary heat treatment protocols like austenitization and quenching.
- Specifies traceability measures, handling, and quality control throughout the manufacturing process.
Testing and Inspection
- Details required mechanical property tests (tensile, Charpy impact, bend tests) and non-destructive testing (NDT) methods such as liquid penetrant, ultrasonic, and radiographic inspections.
- Sets standards for acceptance criteria, repair methods, and retesting in case of failure.
Documentation and Traceability
- Mandates comprehensive documentation, including material designation, heat treatment, test results, and certification as per ISO 10474.
- Emphasizes full traceability of forgings from production through final inspection and delivery.

Applications

Shipbuilding and Offshore Industry
- Used in the fabrication of valves, flanges, and fittings for vessels carrying liquefied natural gas (LNG), liquefied hydrogen, and other cryogenic cargos.
- Ensures pressure containment reliability for tanks and piping systems at extremely low temperatures.
Marine Cryogenic Systems
- Applied in safety-critical systems exposed to subzero temperatures, aligning with global maritime safety codes.
- Supports both new ship construction and retrofitting of existing fleets to handle modern fuels and cargoes.
Material Supply and Procurement
- Provides a reliable reference specification for material suppliers, shipyards, shipping companies, and regulatory bodies.
- Facilitates efficient procurement and consistent quality in marine engineering supply chains.

Related Standards

ISO 148-1: Metallic materials - Charpy pendulum impact test
ISO 2566-2: Steel - Conversion of elongation values
ISO 5208: Industrial valves - Pressure testing of metallic valves
ISO 6892-1: Metallic materials - Tensile testing
ISO 10474: Steel and steel products - Inspection documents
ASME B31.3: Process Piping
ASME Boiler and Pressure Vessel Code, Section VIII
ASTM A370: Mechanical testing of steel products
ASTM A388: Ultrasonic examination of heavy steel forgings
IGC Code / IGF Code: International Maritime Organization regulations for safety in transport and bunkering of cryogenic and low-flashpoint fuels

By adhering to ISO 18741:2026, stakeholders in the shipbuilding and marine technology sectors can ensure the high performance and safety of components used in demanding cryogenic environments, while streamlining compliance with both international and national maritime standards.

Overview

Key Topics

Scope and Applicability
- Covers all types of shipboard and marine components exposed to cryogenic conditions, including both pressure- and non-pressure retaining parts.
- Aligns with requirements relevant to the IGC Code (International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk) and the IGF Code (International Code of Safety for Ships using Gases or other Low-flashpoint Fuels).
Material Specification
- Sets strict requirements for the chemical composition of high-manganese austenitic steel forgings, ensuring consistency and reliability.
- Includes clear guidelines for allowable ranges of key elements (e.g., manganese, carbon) and handling of residual or additional elements.
Manufacturing and Heat Treatment
- Outlines approved methods for steelmaking (e.g., electric furnace, open hearth) and necessary heat treatment protocols like austenitization and quenching.
- Specifies traceability measures, handling, and quality control throughout the manufacturing process.
Testing and Inspection
- Details required mechanical property tests (tensile, Charpy impact, bend tests) and non-destructive testing (NDT) methods such as liquid penetrant, ultrasonic, and radiographic inspections.
- Sets standards for acceptance criteria, repair methods, and retesting in case of failure.
Documentation and Traceability
- Mandates comprehensive documentation, including material designation, heat treatment, test results, and certification as per ISO 10474.
- Emphasizes full traceability of forgings from production through final inspection and delivery.

Applications

Shipbuilding and Offshore Industry
- Used in the fabrication of valves, flanges, and fittings for vessels carrying liquefied natural gas (LNG), liquefied hydrogen, and other cryogenic cargos.
- Ensures pressure containment reliability for tanks and piping systems at extremely low temperatures.
Marine Cryogenic Systems
- Applied in safety-critical systems exposed to subzero temperatures, aligning with global maritime safety codes.
- Supports both new ship construction and retrofitting of existing fleets to handle modern fuels and cargoes.
Material Supply and Procurement
- Provides a reliable reference specification for material suppliers, shipyards, shipping companies, and regulatory bodies.
- Facilitates efficient procurement and consistent quality in marine engineering supply chains.

Related Standards

ISO 148-1: Metallic materials - Charpy pendulum impact test
ISO 2566-2: Steel - Conversion of elongation values
ISO 5208: Industrial valves - Pressure testing of metallic valves
ISO 6892-1: Metallic materials - Tensile testing
ISO 10474: Steel and steel products - Inspection documents
ASME B31.3: Process Piping
ASME Boiler and Pressure Vessel Code, Section VIII
ASTM A370: Mechanical testing of steel products
ASTM A388: Ultrasonic examination of heavy steel forgings
IGC Code / IGF Code: International Maritime Organization regulations for safety in transport and bunkering of cryogenic and low-flashpoint fuels

ISO 18741:2026 PDF

Технические детали

Abstract

Overview

Key Topics

Applications

Related Standards

Похожие стандарты

Abstract

Overview

Key Topics

Applications

Related Standards

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