RINA F620 Steel Plate | F620 Shipbuilding Steel Plate

RINA F620 steel plate, also written as RI/F620, RINA Grade F620, Registro Italiano Navale F620 or market names such as FH62 / FQ63, is the extra-high-strength hull structural steel of RINA Rules for the Classification of Ships (IACS UR W16 extra-high-strength family) with 620 MPa minimum yield, 720-890 MPa tensile strength and Charpy V-notch toughness at -60°C [-76°F]. In the grade name, "F" is the toughness class, and "620" is the yield-strength level in MPa (not AH620). Gangsteel, a steel plate exporter, supplies RINA F620 / RI/F620 plates cut to size for shipbuilding, offshore platforms and marine structures.

Data source: Per IACS UR W16 (extra-high-strength hull structural steel) as adopted in RINA (Registro Italiano Navale) hull structural steel rules, cross-checked with LR FH62 / ABS FQ63 sibling pages on gangsteel.net. Official mill/certificate grade is RINA F620 (RI/F620). Verify the current RINA edition before ordering.

RINA F620 Chemical Composition (Heat Analysis)

 

Element	C	Mn	Si	P	S	Al (acid sol.)
RINA F620, %	0.18 max	1.60 max	0.10-0.55	0.025 max	0.025 max	0.015 min
Element	N	Nb	V	Ti	B	Notes
RINA F620, %	0.020 max	0.02-0.05	0.04-0.10	0.02 max	0.005 max	Ni/Cu/Cr/Mo per delivery condition (N/TM/QT) in UR W16

Per IACS UR W16 / RINA extra-high-strength rules. Exact maxima for Ni, Cu, Cr and Mo depend on delivery condition (N/NR, TM or QT). Carbon equivalent / CET / Pcm limits apply by thickness and condition; confirm on the mill certificate and current rule edition.

Product Analysis (Check Analysis)

 

When product analysis is required, apply ASTM A6/A6M Table A permitted variations to the heat limits unless the element is min-only or not listed in Table A.

Element	Heat analysis limit	Product analysis (heat ± A6)
C	0.18 max	0.22 max
Mn	1.60 max	see A6 Table A vs heat upper limit
Si	0.10-0.55	0.05–0.61 (approx. A6)
P	0.025 max	0.035 max
S	0.025 max	0.035 max
Al (acid sol.)	0.015 min	no A6 Table A tolerance; product value not tabulated
N	0.020 max	0.025 max (typical A6 +0.005)
Nb	0.02-0.05	0.010–0.060
V	0.04-0.10	0.030–0.110
Ti	0.02 max	0.03 max
B	0.005 max	product analysis often not applicable

Product analysis applies only when specified; for a range, results may not vary both above and below it.

RINA F620 Mechanical Properties

 

Grade	Yield strength, min	Tensile strength	Elongation, min
RINA F620	620 MPa [90 ksi]	720-890 MPa [104-129 ksi]	15%

Per IACS UR W16 / RINA rules (common t≤50 mm values). Yield may step down for thicker plates per UR W16; confirm thickness-dependent values on the order.

Charpy V-Notch Impact Requirements (-60°C [-76°F])

 

Thickness	Test temperature	Longitudinal, avg min	Transverse, avg min
t≤50 mm	-60°C [-76°F]	62 J	41 J
50<t≤70 mm	-60°C [-76°F]	62 J	41 J
70<t≤100 mm	-60°C [-76°F]	62 J	41 J

Per IACS UR W16 / RINA extra-high-strength practice. Average of three full-size specimens; transverse values apply when required. Thicker plates by agreement.

Delivery Condition and Deoxidation

Deoxidation: Killed, fine-grain practice. Delivery condition: typically TMCP or QT for extra-high-strength plates; N/NR may apply at lower extra-high levels per rules. F-class (F620) grades are supplied normalized or TMCP (often with Ni alloying for -60°C toughness); as-rolled delivery is not permitted. Optional extras: UT, Z15/Z25/Z35, RINA survey.

Thickness Coverage

Extra-high-strength RINA A/D/E/F 420-690 plates are commonly supplied from about 6 mm to 100 mm thick (thicker by agreement under UR W16). Width 1500-4000 mm and length 6000-18000 mm are typical.

Equivalent Steel Grades of RINA F620

 

Society / Standard	Equivalent grade
RINA (Registro Italiano Navale)	RINA F620 steel plate (RI/F620; LR FH62 / ABS FQ63)
LR (Lloyd's Register)	LR FH62 steel plate
ABS	ABS FQ63 steel plate
GL	GL F620 steel plate
DNV	DNV F620 steel plate
NK	NK F63 steel plate
KR	KR F63 steel plate
BV	BV F620 steel plate

IACS societies align extra-high-strength hull grades under UR W16; naming differs (RINA F620, LR FH62, ABS FQ63). Dual certification is common when ordered that way.

FAQ about RINA F620 Steel Plate

What is RINA F620 steel plate?

It is an extra-high-strength hull structural steel under RINA Rules (IACS UR W16 extra-high-strength family), with 620 MPa minimum yield, 720-890 MPa tensile strength and Charpy toughness at -60°C [-76°F]. The mill certificate grade is RINA F620 (RI/F620).

What does RINA F620 / RI/F620 stand for?

RINA is Registro Italiano Navale (RI on certificates). The letter F is the toughness class (Charpy at -60°C [-76°F]), and 620 is the yield-strength level in MPa. Market/LR naming often uses FH62; ABS often uses FQ63. Note: RINA does not use AH620 — the grade is F620, not AH620.

What is the yield strength of RINA F620?

Minimum 620 MPa (90 ksi), tensile 720-890 MPa (104-129 ksi), elongation about 15% min (for the common thickness range).

What is the impact test temperature for RINA F620?

Charpy V-notch at -60°C [-76°F]. Typical longitudinal average minimum is 62 J (transverse 41 J) for the tabulated thickness range on this grade page.

What is the difference between RINA A620, D620, E620 and F620?

Same 620 MPa strength class. Toughness class differs: A at 0°C, D at -20°C, E at -40°C, F at -60°C. Chemistry (C, P, S, Mn) is tightened for colder classes.

How does RINA F620 differ from higher-strength RINA AH40?

RINA AH40 is UR W11 higher-strength (390 MPa). RINA F620 is UR W16 extra-high-strength (620 MPa) with different chemistry and delivery practice (often TM/QT).

Is RINA F620 the same as LR FH62 or ABS FQ63?

They are IACS counterparts in the extra-high-strength family; exact chemistry/delivery options differ by society edition. Dual certification is available when surveys are arranged.

Is RINA F620 weldable?

Weldable with approved procedures for extra-high-strength ship steel. Preheat, heat input and consumable matching are critical; follow the mill WPS and RINA welding requirements.

What heat treatment is required for RINA F620?

Extra-high-strength grades are typically delivered TMCP or quenched and tempered (QT), sometimes normalized/normalized-rolled depending on strength level and thickness. F-class (F620) grades are supplied normalized or TMCP (often with Ni alloying for -60°C toughness); as-rolled delivery is not permitted. Optional extras: UT, Z15/Z25/Z35, RINA survey.

What thickness is available for RINA F620?

Common supply is about 6-100 mm (thicker by agreement under UR W16 / RINA rules), 1500-4000 mm wide and 6000-18000 mm long.

Other RINA Steel Plate Grades

RINA Grade A steel plate | RINA Grade B steel plate | RINA Grade D steel plate | RINA Grade E steel plate | RINA AH32 steel plate | RINA AH36 steel plate | RINA AH40 steel plate | RINA DH32 steel plate | RINA DH36 steel plate | RINA DH40 steel plate | RINA EH32 steel plate | RINA EH36 steel plate | RINA EH40 steel plate | RINA FH32 steel plate | RINA FH36 steel plate | RINA FH40 steel plate | RINA A420 steel plate | RINA A460 steel plate | RINA A500 steel plate | RINA A550 steel plate | RINA A620 steel plate | RINA A690 steel plate | RINA D420 steel plate | RINA D460 steel plate | RINA D500 steel plate | RINA D550 steel plate | RINA D620 steel plate | RINA D690 steel plate | RINA E420 steel plate | RINA E460 steel plate | RINA E500 steel plate | RINA E550 steel plate | RINA E620 steel plate | RINA E690 steel plate | RINA F420 steel plate | RINA F460 steel plate | RINA F500 steel plate | RINA F550 steel plate | RINA F690 steel plate

Equivalent Class Society Grades

RINA F620 corresponds to extra-high-strength counterparts under other IACS societies (LR FH62, ABS FQ63, etc.): LR FH62 steel plate, ABS FQ63 steel plate, GL F620 steel plate, DNV F620 steel plate, NK F63 steel plate, KR F63 steel plate, BV F620 steel plate, RINA F620 steel plate.