S420G2+M

S420G2+M Steel Plate

S420G2+M high yield structural plates for offshore are indended for (but not limited to) use in fixed offshore structures,

designed to operate in the offshore sector.

Applicable codes and standards

BS-EN 10225:2009

Weldable structural steels for fixed offshore structures - technical delivery conditions.

S420G2+M Nearest Equivalent Grade : API 1993 = API 2W Grade 60 ; Former NORSOK M-120 = Y30

S420M3z

S420G2+Q Nearest Equivalent Grade : API 1993 = API 2Y Grade 60 ; Former NORSOK M-120 = Y30

S420M3z

Defination of S420G2+M;S420G2+Q

S420 G2+M / S420 G2+Q
S = Structural	420 = Minimum Yield S in MPa for thickness t ≤ 16mm	Letter G	+M = Delivery Condition
Symbol for structural and indicating that following figures specify the minimum yield strangth in MPa.(MPa=N/mm2)	t ≤ 16mm 420MPa 16 < t ≤ 40mm 400MPa 40 < t ≤ 63mm 390MPa 63 < t ≤ 100mm 380MPa	Follow by a maximum of two digits characterising and indicating the steel grade within the groups 1,2,3, as defined per table 4 of EN10225	+M Thermo mechanical rolling +N Normalizing rolling +Q Quenched and tempered Thermo mechanical rolling is a rolling process in whichthe final deformationis carried out in a particular temperature range leading to a material condition equivalent with certain properties which cannot be achieved or repeated by a heat treatment alo

Within EN10225 this steel is designated as a group 3 steel which means that this steel grade is substanially modified from EN

10025-4.

This steel ofer s enhanced through thickness ductility and impact values veryfied at -40ºC. This steel grade is also known as

1.8857+M.

Product analysis in % (All values are max. unless otherwise stated.)

S420G2+M Chemical composition

C	0.14⁴	Cu	0.30	Cr+Mo+Ni+Cu	0.90
Si	0,15-0,55	N	0.30	Nb+V	0.09
Mn	1.65	Nb	0.040	Nb+V+Ti	0.11
P	0.020	Ti	0.025	CEV (ⅡW) see formula below	0.42¹
S	0.007	V	0.080	Pcm See formula below	0.22
Cr	0.25	As²	0.03
Mo	0.25	Sb²	0.010	Bi²	0.010
Ni	0.70	Sn²	0.020	Ca²	0.005
Al3	0.015/0.055	Pb²	0.010	B²	0.0005

CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15

Pcm = C + (Si/30) + (Mn+Cu+Cr)/20 + (Ni/60) +   (Mo/15) + (V/10) + 5(B)

S420G2+M Mechanical Properties

Thickness t	Yield Reh	Tensile Rm	Reh / Rm	CVN	El
mm	MPa (min)	MPa	-	-40ºC	%
t ≤ 16	420	500-600	max. 0.93	≥60J transverse	19
16 < t ≤ 40	400		max. 0.90
140 < t ≤ 63	390	480-640
63 < t ≤ 100	420

Available options as per section 13 of EN 10025

Option	Subject	Remarks
10	PWHT*	Mechanical tests include SPWHT condition for thicknesses greater than 40mm
12	Strain ageing*	Strain ageing tests are carried out for thicknesses greater than or equal to 12.5mm. Plastic strain 5%, age for 1h at 250ºC. Transverse CEV - values in strain aged condition min. 36/26J at -40ºC
13	Through Thickness Testing	TTP testing for thicknesses ≥ 15 mm. To meet class Z35 according to EN 10164. Through thickness strengths min 80% of specified minimum tensile strength for specifield thickness.
-	Low Sulphur	S ≤ 0.005% in combination with abvove option 13
-	Hardness	Hardness tested according to Vickers
18	weldability*	Pre qualification for thicknesses ≥ 40 mm up to 75 mm

*Available upon request

Surface

All surfaces have been 100% visually inspected. The surface condition does comply with

EN 10163 -2, class A, sub-class 3.

NDT

All plates have been ultrasonically tested in accordance with EN 10160. Ultrasonic testing has been carried out either prior to,

or after the final heat treatment and does meet the requirements of EN 10160, class S1/E2 for steels of group 3.

According EN 10225 this steel designated a group 3 steel.

Certification and traceability.

All dimensions will be supplied with a 3.2 certificate according to EN 10204, endorsed by recognized and independent inspection agency.

Low stress die-stamping on head and tail of each plate.

Dimensional control

All dimensions will be supplied according to EN 10029, flatness calss N, thickness class A.