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DNV-OS-E302 Offshore Mooring Chain

Ch.2: Technical Provisions

Sec.1: Materials

E: Materials for Studs

Ch.2 Sec.1
E. Materials for Studs

Ch.2 Sec.1
E 100   Scope

Ch.2 Sec.1
E 200   Chemical composition

Ch.2 Sec.1 E

Table E1 Minimum mechanical properties for chain cable materials
Steel grade	Yield stress	Tensile strength	Elongation	Reduction of area	Charpy V-notch
	Re	Rm	A5	Z	Temperature 1)	Average energy	Single energy
	N/mm2	N/mm2	%	%	°C	J	J
R3	410	690	17	50 2)	0	60	45
					-20	40	30
R3S	490	770	15	50 2)	0	65	49
					-20	45	34
R4	580	860	12	50 3)	-20	50	38
R4S	700	960	12	50 3)	-20	56	42
R5	760	1000	12	50 3)	-20	58	44
1) For grade R3 and R3S, testing may be carried out at either 0°C or -20°C. 2) For cast accessories, the minimum value shall be 40%. 3) For cast accessories, the minimum value shall be 35%.

Ch.2 Sec.1 E

Table E2 Dimensional tolerances for rolled bars
Nominal bar diameter	Tolerance on diameter	Tolerance on roundness
mm	mm	(dmax - dmin) mm
51 - 80	-0 +2.0	1.50
81 - 100	-0 +2.6	1.95
101 - 120	-0 +3.0	2.25
121 - 160	-0 +4.0	3.00
161 - 210	-0 +5.0	4.00