Section 3 Materials
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Special Service Craft, July 2022 - Part 10 Prime Movers - Chapter 2 Gas Turbines - Section 3 Materials

Section 3 Materials

Parent topic: Chapter 2 Gas Turbines

3.1 Materials for forgings

3.1.1 Rotors and discs are to be of forged steel. For carbon and carbon-manganese steel forgings, the specified minimum tensile strength is to be selected within the limits of 400 and 600 N/mm2. For alloy steel rotor forgings, the specified minimum tensile strength is to be selected within the limits of 500 and 800 N/mm2. For discs and other alloy steel forgings, the specified minimum tensile strength is to be selected within the limits of 500 and 1000 N/mm2. See also Rules for the Manufacture, Testing and Certification of Materials (hereinafter referred to as the Rules for Materials).

3.1.2 For alloy steels, specifications giving the proposed chemical composition and heat treatment are to be submitted for approval.

3.1.3 When it is proposed to use a material of higher tensile strength, full details are to be submitted for approval.

3.1.4 Components of non-ferrous construction should be submitted for consideration, together with full details of materials to be used and method of fabrication.

3.2 Material tests and inspection

3.2.1 Components are to be tested in accordance with the relevant requirements of the Rules for the Manufacture, Testing and Certification of Materials, July 2022.

3.2.2 For components of novel design special consideration will be given to the material test and non-destructive testing requirements.

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