Foreword

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This document was prepared by Technical Committee TC 8, Ships and marine technology, Subcommittee SC 4, Outfitting and deck machinery.

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Introduction

The newly developed, high-manganese austenitic steel is expected to possess mechanical properties including Charpy impact energy values comparable to those materials for cryogenic service listed in both the IGC Code^[ 1 ^] and IGF Code.^[ 2 ^] Consequently, high-manganese steel is intended to satisfy the strength requirements of the structure of cargo tanks, fuel tanks and piping systems.

In addition, upon agreement with a purchaser, this document can be applied to piping systems for liquefied hydrogen.

This document provides a standard specification of high-manganese austenitic steel plate, sheet, strip and coil for material manufacturers, ship owners, ship yards and shipping companies with regard to producing, purchasing and using such materials.

1 Scope

This document specifies the delivery conditions for high-manganese austenitic steel in the form of hot rolled or cold rolled plates, sheets, and coils for low temperature purposes.

This document covers all product types with a thickness below 6,0 mm. Refer to ISO 23430 for specifications on high manganese-austenitic steel thin strips.

2 Normative references

3 Terms and definitions

4 Manufacture

4.1 Steel-making practice

4.2 Rolled product

4.3 Chemical composition

4.4 Mechanical properties

4.5 Retesting

4.6 Supplementary processes (optional)

5 Inspection

5.1 Surface quality and internal soundness

5.2 Weld repair

5.3 Dimensional inspection

6 Marking

7 Documentation

Bibliography