LR V.2 Materials
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Clasifications Register Rules and Regulations - Rules and Regulations for the Construction and Classification of Ships for the Carriage of Liquid Chemicals in Bulk, July 2022 - LR V Structural Arrangements and Scantlings - LR V.2 Materials

LR V.2 Materials

Parent topic: LR V Structural Arrangements and Scantlings

LR V.2.1 General

LR V.2.1.1 Materials are to comply with Pt 3, Ch 2 Materials*.

LR V.2.1.2 Attention is also drawn to Chapter 6 of these Rules.

LR V.2.1.3 The following symbols and definitions are applicable to these Rules:

k L, k = higher tensile steel factor. For the determination of this factor, see Pt 3, Ch 2, 1 Materials of construction For mild steel k L, k may be taken as 1,0.

See Ch 2, 2.2 Definition of yield stress for steel of the Rules for Materials for definition of yield stress for steel.

LR V.2.2 Austenitic and duplex stainless steel

LR V.2.2.1 The following symbols and definitions are applicable to these Rules:

k 1 =
k 2 =
σoRT = specified minimum yield or 0,2 per cent proof stress, in N/mm2, at room temperature as specified in Table 3.7.2 Mechanical properties for acceptance purposes in Ch 3,7 of the Rules for Materials
σoT = specified minimum yield or 0,2 per cent proof stress, in N/mm2, at the design temperature; this can be taken as
= –40l n (T) + 127 + σoRT for austenitic stainless steel without N grade designation
= –48l n (T) + 142 + σoRT for austenitic stainless steel with N grade designation
= –65l n (T) + 200 + σoRT for duplex stainless steel
T = design temperature in °C

LR V.2.2.2 Alternative to the specified minimum 0,2 per cent proof stress at room temperature stipulated in Table 3.7.2 Mechanical properties for acceptance purposes in Ch 3,7 of the Rules for Materials, the manufacturer’s specification can be used. The mechanical properties at room temperature specified in the plate manufacturer’s specification are to be regarded as the minimum values for acceptance purposes and are to be included on all construction plans. The properties at the design temperature are also to be shown on the plans.

LR V.2.2.3 The formulas given in LR V.2.2 Austenitic and duplex stainless steel for calculating σoT are valid for temperatures from 20°C to 200°C. For applications at higher temperatures, special consideration is required.

LR V.2.2.4 Where duplex steel grades are to be used in areas which are subject to fatigue loading the material factors as calculated above k 1 and k 2 are not to be less than 0,66.

LR V.2.3 Clad plates

LR V.2.3.1 For clad plates the specified minimum value of tensile strength or yield strength or 0,2 per cent proof stress can be calculated as:

where
t 1 = thickness of base material, in mm
t 2 = thickness of cladding, in mm
σ01 = specified minimum yield or 0,2 per cent proof stress of base material, in N/mm2
σ02 = specified minimum yield or 0,2 per cent proof stress of base cladding, in N/mm2
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