RINA DH36 Steel Plate | DH36 Shipbuilding Steel Plate

RINA DH36 steel plate, also written as RI/DH36, RINA Grade DH36, Registro Italiano Navale DH36 or DH36 ship steel plate, is the higher-strength hull structural steel of RINA Rules for the Classification of Ships (IACS UR W11 higher-strength family) with 355 MPa minimum yield, 490-620 MPa tensile strength and Charpy V-notch toughness at -20°C [-4°F]. In the grade name, "D" is the toughness class, "H" means higher strength and "36" refers to the strength level (historically about 36 kgf/mm²). Gangsteel, a steel plate exporter, supplies RINA DH36 / RI/DH36 plates cut to size for shipbuilding, offshore platforms and marine structures.

Data source: Per IACS UR W11 (ordinary/higher-strength hull structural steel) as adopted in RINA (Registro Italiano Navale) hull structural steel rules. Official mill/certificate grade is RINA DH36 (RI/DH36). Verify the current RINA edition before ordering.

RINA DH36 Chemical Composition (Heat Analysis)

 

Element	C	Mn	Si	P	S	Al (acid sol.)
RINA DH36, %	0.18 max	0.90-1.60	0.10-0.50	0.035 max	0.035 max	0.015 min
Element	Nb	V	Ti	Cu	Cr	Ni / Mo
RINA DH36, %	0.02-0.05	0.05-0.10	0.02 max	0.35 max	0.20 max	0.40 max / 0.08 max

Per IACS UR W11 / RINA hull structural steel rules (higher-strength grades). Nb, V and Al grain-refining elements may be used singly or in combination; when used in combination the individual minima do not apply. Where acid-soluble Al is not less than 0.015%, the Si minimum does not apply. Carbon equivalent: Ceq = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15 (%).

Product Analysis (Check Analysis)

 

IACS UR W11 / RINA rules do not separately tabulate product (check) analysis limits for higher-strength grades. When product analysis is required, the finished plate shall meet the heat limits subject to ASTM A6/A6M Table A permitted variations (same practice as other IACS societies).

Element	Heat analysis limit	Product analysis (heat ± A6)
C	0.18 max	0.22 max
Mn	0.90-1.60	0.81–1.72
Si	0.10-0.50	0.04–0.56
P	0.035 max	0.045 max
S	0.035 max	0.045 max
Al (acid sol.)	0.015 min	no A6 Table A tolerance; product value not tabulated
Nb	0.02-0.05	0.010–0.060
V	0.05-0.10	0.040–0.110
Ti	0.02 max	0.03 max
Cu	0.35 max	0.38 max
Cr	0.20 max	0.24 max
Ni	0.40 max	0.43 max
Mo	0.08 max	0.09 max

Per IACS UR W11 / RINA hull structural steel rules. Product analysis applies only when specified; for a range, results may not vary both above and below it.

RINA DH36 Mechanical Properties

 

Grade	Yield strength, min	Tensile strength	Elongation, min
RINA DH36	355 MPa [51 ksi]	490-620 MPa [71-90 ksi]	21%

Per IACS UR W11 / RINA hull structural steel rules. Yield and tensile values apply for the full thickness range covered by the grade (typically up to 100 mm for these ship plates).

Charpy V-Notch Impact Requirements (-20°C [-4°F])

 

Thickness	Test temperature	Longitudinal, avg min	Transverse, avg min
t≤50 mm	-20°C [-4°F]	34 J	24 J
50<t≤70 mm	-20°C [-4°F]	41 J	27 J
70<t≤100 mm	-20°C [-4°F]	50 J	34 J

Per IACS UR W11 / RINA hull structural steel rules. Average of three full-size Charpy V-notch specimens; not more than one value below the average and none below 70% of it. Longitudinal values shown; transverse values apply when required by the rules or purchase order. Thicker plates (above 100 mm) may be supplied by agreement with adjusted impact requirements.

Delivery Condition and Deoxidation

Deoxidation: Killed, fine-grain practice. Delivery condition: D-class (DH36) grades are typically normalized or TMCP; controlled-rolled delivery may apply within rule limits. Optional extras by agreement include ultrasonic testing, Z-direction (Z15/Z25/Z35) through-thickness testing and third-party RINA survey.

Thickness Coverage

Higher-strength RINA AH/DH/EH/FH 32/36/40 plates are commonly supplied from about 6 mm to 100 mm thick (up to 150 mm by agreement). Width 1500-4000 mm and length 6000-18000 mm are typical.

Equivalent Steel Grades of RINA DH36

 

Society / Standard	Equivalent grade
RINA (Registro Italiano Navale)	RINA DH36 steel plate (RI/DH36)
LR (Lloyd's Register)	LR DH36 steel plate
ABS	ABS DH36 steel plate
CCS	CCS DH36 steel plate
ASTM A131/A131M	ASTM A131 DH36 steel plate
GL	GL DH36 steel plate
DNV	DNV D36 steel plate
BV	BV DH36 steel plate
NK	NK D36 steel plate
KR	KR D36 steel plate

IACS member societies harmonize ordinary and higher-strength hull grades under UR W11; dual certification (for example RINA + ABS, or RINA + ASTM A131) is common when ordered that way.

FAQ about RINA DH36 Steel Plate

What is RINA DH36 steel plate?

It is a higher-strength hull structural steel under RINA (Registro Italiano Navale) Rules for the Classification of Ships (IACS UR W11), with 355 MPa minimum yield, 490-620 MPa tensile strength and Charpy toughness at -20°C [-4°F]. The mill certificate grade is RINA DH36 (RI/DH36).

What does RINA DH36 / RI/DH36 stand for?

RINA is Registro Italiano Navale (also abbreviated RI on mill certificates). The letter D is the toughness class (Charpy at -20°C [-4°F]), H means higher strength, and 36 is the strength level (historically about 36 kgf/mm², now 355 MPa min yield).

What is the yield strength of RINA DH36?

Minimum 355 MPa (51 ksi), tensile 490-620 MPa (71-90 ksi), elongation about 21% min.

What is the impact test temperature for RINA DH36?

Charpy V-notch at -20°C [-4°F]. Longitudinal average minima are 34 J up to 50 mm, 41 J for 50-70 mm and 50 J for 70-100 mm.

What is the difference between RINA DH36 and other 36-class grades?

Same 355 MPa strength class. RINA AH36 at 0°C [32°F]; RINA DH36 at -20°C [-4°F]; RINA EH36 at -40°C [-40°F]; RINA FH36 at -60°C [-76°F]. Delivery condition follows the toughness letter rules.

What is the difference between RINA DH36 and RINA DH32?

Same D-class toughness (Charpy at -20°C [-4°F]). RINA DH36 is strength class 36 (355 MPa min yield); RINA DH32 is strength class 32 (315 MPa min yield).

Is RINA DH36 the same as ABS DH36 or LR DH36?

Requirements are essentially harmonized under IACS UR W11. ABS DH36, LR DH36, DNV D36, BV DH36, KR D36, NK D36 and ASTM A131 DH36 (where listed) are counterparts; dual certification is common when ordered with the required surveys.

Is RINA DH36 weldable?

Yes. Controlled carbon and Ceq give good weldability; preheat may be required for thick sections depending on Ceq and restraint.

What heat treatment is required for RINA DH36?

D-class (DH36) grades are typically normalized or TMCP; controlled-rolled delivery may apply within rule limits.

What thickness is available for RINA DH36?

Typical supply is about 6-100 mm thick (up to 150 mm by agreement), 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 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

Equivalent Class Society Grades

RINA DH36 corresponds to the same grade under the other IACS member classification societies: LR DH36 steel plate, ABS DH36 steel plate, CCS DH36 steel plate, ASTM A131 DH36 steel plate, GL DH36 steel plate, DNV D36 steel plate, BV DH36 steel plate, NK D36 steel plate, KR D36 steel plate, RINA DH36 steel plate.