ISO 21635:2018 PDF

Ships and marine technology — Specification of high manganese austenitic steel used for LNG tanks on board ships

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Title (English):

ISO 21635:2018

Ships and marine technology — Specification of high manganese austenitic steel used for LNG tanks on board ships

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 6
Publication date:: July 17, 2018
Edition:: ISO IS 21635 edition 1 version 1
ICS:: 47.020.05

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Description (English):

This document describes the specification of high manganese (Mn) austenitic steel plates to be used for LNG tanks on board ships. The specification of high manganese austenitic steel can be also considered for design and manufacture of cargo tanks and process pressure vessels of LNG supply/terminal and transportation of fuels and traded gases. This document is primarily applicable for the specification of LNG tanks below volumetric capacity of approximately 30 000 m3 using high manganese austenitic steel. The thickness of plates is limited to between 6 mm to 40 mm.

Technical details

Technical committee: ISO/TC 8/SC 8 - Ship design
SKU: ISO 21635:2018

Abstract

Overview

ISO 21635:2018 specifies requirements for high manganese (Mn) austenitic steel plates intended for LNG tanks on board ships. The standard targets plates with thicknesses between 6 mm and 40 mm and is primarily applicable to LNG tanks with volumetric capacity up to approximately 30 000 m3. It provides material purchasers, shipyards, steelmakers and tank manufacturers with requirements covering chemical composition, mechanical properties, manufacture, testing and documentation.

Key Topics

Chemical composition: The standard defines a high Mn chemistry to retain austenite as the primary phase (Mn typically in the range indicated by the standard). Other alloying and impurity elements are controlled per the specification.
Mechanical properties: Tensile and yield strength, elongation and Charpy V-notch impact energy requirements are specified. Impact testing is required at cryogenic temperatures (default test temperature -196 °C) with minimum average absorbed energies stated for transverse and longitudinal specimens.
Manufacture and processing: Plates must be produced by recognized steelmaking routes, be killed, hot-rolled and subject to controlled cooling to avoid grain boundary carbide precipitation. A recommended cooling rate faster than 10 °C/s is given and forming above 500 °C is not permitted.
Testing and acceptance: Tensile tests (ISO 6892-1) and Charpy V-notch tests (ISO 148-1) are required from each piece. Sub-sized specimens are permitted for thin plates (t

Related standards

Mentioned in the description and other ISO standards

Overview

Key Topics

Chemical composition: The standard defines a high Mn chemistry to retain austenite as the primary phase (Mn typically in the range indicated by the standard). Other alloying and impurity elements are controlled per the specification.
Mechanical properties: Tensile and yield strength, elongation and Charpy V-notch impact energy requirements are specified. Impact testing is required at cryogenic temperatures (default test temperature -196 °C) with minimum average absorbed energies stated for transverse and longitudinal specimens.
Manufacture and processing: Plates must be produced by recognized steelmaking routes, be killed, hot-rolled and subject to controlled cooling to avoid grain boundary carbide precipitation. A recommended cooling rate faster than 10 °C/s is given and forming above 500 °C is not permitted.
Testing and acceptance: Tensile tests (ISO 6892-1) and Charpy V-notch tests (ISO 148-1) are required from each piece. Sub-sized specimens are permitted for thin plates (t

ISO 21635:2018 PDF

Technical details

Abstract

Overview

Key Topics

Related standards

Abstract

Overview

Key Topics

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