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 aim of this document is to provide a set of common requirements for metallic materials used in cryogenic applications, in alignment with the IGC Code^[ 1 ^] and IGF Code^[ 2 ^] adopted by the International Maritime Organization (IMO).

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 and IGF Code. 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 castings for material suppliers, ship owners, ship yards, manufacturers and shipping companies with regard to producing, purchasing and using such materials.

1 Scope

This document specifies minimum requirements for high-manganese austenitic steel castings for valves, flanges and other pressure-containing components used at cryogenic temperature.

This document can be applicable to all pressure retaining components and any non-pressure retaining component.

2 Normative references

3 Terms and definitions

4 Abbreviated terms

5 Health, safety and quality requirements

5.1 Health and safety requirements

5.2 Quality requirements

6 Material designation

7 Manufacture

7.1 Steel making practice

7.2 Moulding

8 Chemical composition

9 Heat treatment

9.1 Temperature uniformity survey (TUS) for heat treatment furnace

9.2 Heat treatment

10 Mechanical properties

10.1 Preparation of test specimens

10.2 Extent of testing

10.3 Mechanical properties

10.4 Retesting

11 Inspection

11.1 General requirements

11.2 Visual inspection

11.3 Liquid penetrant inspection

11.4 Radiographic inspection

11.5 Ultrasonic inspection

11.6 Hydrostatic testing

12 Repairs

13 Dimension inspection

14 Traceability, handling and packing

15 Documentation

Bibliography