Section 5 Steels for machinery fabrications
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules for the Manufacture, Testing and Certification of Materials, July 2022 - Chapter 3 Rolled Steel Plates, Strip, Sections and Bars - Section 5 Steels for machinery fabrications

Section 5 Steels for machinery fabrications

Parent topic: Chapter 3 Rolled Steel Plates, Strip, Sections and Bars

5.1 General

5.1.1 Steel plates, sections or bars intended for use in the construction of major components of welded machinery structures, such as bedplates, crankcases, frames and entablatures, are to comply with one of the following alternatives:

  1. Any grade of normal strength structural steel as detailed in Ch 3, 2 Normal strength steels for ship and other structural applications.

  2. Any grade of higher tensile structural steel as detailed in Ch 3, 3 Higher strength steels for ship and other structural applications.

  3. Any grade of carbon-manganese boiler or pressure vessel steel as detailed in Ch 3, 4 Steels for boilers and pressure vessels, except that for this application batch testing is acceptable. The size of a batch and the number of tensile tests are to be as detailed in Ch 3, 2 Normal strength steels for ship and other structural applications.

5.1.2 The minus tolerances for products for machinery structures are to be in accordance with Table 3.5.1 Under thickness tolerances.

Table 3.5.1 Under thickness tolerances

Nominal thickness, t (mm) Minus tolerance on nominal thickness (mm)
3 ≤ t < 5 −0,3
5 ≤ t < 8 −0,4
8 ≤ t < 15 −0,5
15 ≤ t < 25 −0,6
25 ≤ t < 40 −0,7
40 ≤ t < 80 −0,9
80 ≤ t < 150 −1,1
150 ≤ t < 250 −1,2
t ≥ 250 −1,3

5.2 Certification of materials

5.2.1 At least two copies of each test certificate are to be provided. They are to be of the type and give the information detailed in Ch 3, 1.13 Certification of materials and, additionally, are to state the specified maximum carbon equivalent. As a minimum, chemical composition is to include the contents of any grain refining elements used and of the residual elements.

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