Section 2 Manufacturing process and supply condition
Clasification Society 2024 - Version 9.40
Clasifications Register Guidance Information - Guidance for Approval, Manufacture, Testing and Certification of High Manganese Austenitic Steel for Low Temperature Service, July 2022 - Chapter 2 Manufacture, Testing and Certification - Section 2 Manufacturing process and supply condition

Section 2 Manufacturing process and supply condition

Parent topic: Chapter 2 Manufacture, Testing and Certification

2.1 Manufacture and chemical composition

2.1.1 Steel should be manufactured by the basic oxygen, electric furnace or open hearth processes or by other processes specially approved by LR.

2.1.2 The deoxidation practice should be fully killed for steel.

2.1.3 The steel should be fine grain treated and should have a fine grain structure. The fine grain practice should be as detailed in the manufacturing specification.

2.1.4 The chemical composition of samples taken from each ladle of each cast should be determined by the steelmaker in an adequately equipped and competently staffed laboratory.

2.1.5 The manufacturer’s chemical specification will be approved during the initial work approval stage and should comply with the requirements of Table 2.2.1 Chemical composition for high manganese austenitic steel.

Table 2.2.1 Chemical composition for high manganese austenitic steel

C Si Mn P S Cr B N Cu
0,35 0,10 22,50 ≤ 0,030 ≤ 0,010 3,00 ≤ 0,005 ≤ 0,050 0,30
~0,55 ~0,50 ~25,50 ~4,00 ~0,70
The content of other elements used for alloying and fine grain treatment may be specified by the steelmaker, as appropriate.
Silicon (Si) may be less than 0,1 per cent, provided total aluminium is 0,03 per cent or higher, or provided acid soluble aluminium is 0,025 per cent or higher.

2.2 Condition of supply

2.2.1 Condition of supply for all material is hot rolled and subsequent controlled cooling if necessary. Alternative supply conditions are to be approved by LR.

2.2.2 The reduction ratio of slab to finished product thickness should be not less than 3:1.

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