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 12 Propulsion Devices - Chapter 1 Propellers - Section 3 Materials

Section 3 Materials

Parent topic: Chapter 1 Propellers

3.1 Castings for propellers

3.1.1  Castings for propellers and propeller blades are to comply with the requirements of the Rules for the Manufacture, Testing and Certification of Materials, July 2022 (hereinafter referred to as the Rules for Materials). The chemical composition and mechanical properties of steel castings are given in Ch 4, 5 Castings for propellers of the Rules for Materials and those of the copper alloys are given in Ch 9, 1 Castings for propellersof the Rules for Materials.

3.1.2 The specified minimum tensile strength of the castings is to be not less than stated in Table 1.3.1 Materials for propellers.

Table 1.3.1 Materials for propellers

Material Specified minimum tensile strength

N/mm2

G

Density

g/cm3

 U

Allowable stress

N/mm2
Carbon steels 400 7,9 20,6
Low alloy steels 440 7,9 20,6
13% chromium stainless steels 540 7,7 41
Chromium - nickel austenitic stainless steel 450 7,9 41
Duplex stainless steels 590 7,8 41
Grade Cu 1
Manganese bronze
(high tensile brass) 		440 8,3 39
Grade Cu 2
Ni-Manganese bronze
(high tensile brass) 		440 8,3 39
Grade Cu 3
Ni-Aluminium bronze 		590 7,6 56
Grade Cu 4
Mn-Aluminium bronze 		630 7,5 46

3.1.3 Where propellers of carbon and low alloy steels shown in Table 1.3.1 Materials for propellers are provided with an approved method of cathodic protection, special consideration will be given to the value of U.

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