Overview
ISO 18819:2026, titled Ships and marine technology - High-manganese austenitic steel - Specification for plates, sheets and coils below 6,0 mm for cryogenic temperature, is an international standard developed by ISO. This document specifies the conditions for the delivery of high-manganese austenitic steel products-including hot rolled and cold rolled plates, sheets, and coils under 6.0 mm thickness-intended for use at low and cryogenic temperatures. ISO 18819:2026 supports material manufacturers, ship owners, shipyards, and shipping companies in producing, purchasing, and utilizing high-manganese austenitic steel in line with global best practices for safety and performance under cryogenic conditions.
Key Topics
- Product Scope: Applies to plates, sheets, and coils manufactured from high-manganese austenitic steel, each with thicknesses below 6.0 mm. It does not cover thin strips, which are specified in ISO 23430.
- Material Properties: Defines minimum mechanical properties, including yield strength, tensile strength, elongation, and Charpy impact energy suited for service temperatures down to -196 °C.
- Manufacturing Requirements: Outlines allowed steelmaking practices, cooling rates to prevent carbide precipitation, and chemical composition limits to ensure retention of austenite and reliable cryogenic performance.
- Inspection and Testing: Stipulates protocols for mechanical testing (tensile and impact tests), retesting procedures, surface and internal quality, dimensional inspections, and marking.
- Documentation & Traceability: Mandatory documentation per ISO 10474 ensures complete traceability of each batch, including chemical and mechanical test results and identification numbers.
Applications
ISO 18819:2026 is fundamental for sectors requiring reliable performance at cryogenic temperatures:
- Shipbuilding: Essential for constructing cargo tanks, fuel tanks, and piping systems in LNG carriers, LPG carriers, and ships carrying low-temperature fuels.
- Marine Technology: Ensures safety and durability of steel components used in cryogenic applications such as handling and storage of liquefied gases.
- Cryogenic Storage: Supports adoption of high-manganese steel in on-board systems, where retention of mechanical properties at low temperatures is critical.
- Liquefied Hydrogen Applications: Upon agreement between the purchaser and manufacturer, the specification may also apply to steel products used in liquefied hydrogen piping systems.
The standard is designed to align with the requirements of international maritime codes (including the IGC and IGF codes), which enhances global safety and regulatory compliance for vessels in the transport of liquefied gases and low-flashpoint fuels.
Related Standards
To ensure comprehensive compliance, ISO 18819:2026 references several related international standards:
- ISO 23430: Specification for high-manganese austenitic steel thin strips used for LNG tanks on ships.
- ISO 148-1: Test method for Charpy pendulum impact test.
- ISO 6892-1: Method of tensile testing at room temperature.
- ISO 2566-1: Conversion of elongation values for carbon and low-alloy steels.
- ISO 10474: Requirements for inspection documents for steel and steel products.
- ISO 16160 & ISO 16162: Tolerances for hot-rolled and cold-rolled steel sheet products.
- EN 10048, EN 10140: European standards for tolerances on dimensions and shapes of narrow steel strips.
- ASTM A370, ASTM E8: Alternative testing standards for mechanical properties of steel products.
- IGC and IGF Codes: International Maritime Organization codes related to ship safety for liquefied gases and low-flashpoint fuels.
By following ISO 18819:2026, industry stakeholders can assure high standards in material selection, testing, and traceability for high-manganese austenitic steel products used in challenging cryogenic and marine environments.