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 forgings 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 the delivery conditions for longitudinally welded pipes of circular cross-section, made of high-manganese austenitic steel, intended for cryogenic temperature applications under pressure.

This document is applicable to all pressure-retaining components and any non-pressure-retaining components, such as members of pipe supports, which are welded directly to a pressure-retaining component.

2 Normative references

3 Terms and definitions

4 Symbols and abbreviated terms

4.1 Symbols

4.2 Abbreviated terms

5 Health, safety and quality requirements

5.1 Health and safety requirements

5.2 Quality requirements

6 Manufacturing process

6.1 Steelmaking process

6.2 Rolled product

7 Welding requirements

7.1 General requirements

7.2 Welding processes

7.3 Preparation for welding

7.4 Welder and welding operator performance qualification

7.5 Welding consumables

8 Welding procedure qualification

8.1

8.2

8.3

8.4

8.5

9 Metallurgical properties

9.1 Chemical composition

9.2 Mechanical properties

10 Dimensions, mass and tolerances

10.1 Diameters, wall thickness and masses

10.2 Tolerances on lengths

11 Inspection

11.1 Visual inspection

11.2 Hydrostatic test

11.3 Non-destructive testing

11.4 Preparation of ends

12 Marking

13 Documentation

Bibliography