RINA GRADE D620 Steel Plate Applications & Ordering Guide

RINA Grade D620 (Registro Italiano Navale extra-high-strength shipbuilding steel) is specified for industrial fabrications where the drawing or material list names this grade. This applications page explains where the grade is used, what service conditions drive selection, and which certificate details belong on the purchase order. Gangsteel supplies RINA Grade D620 (Registro Italiano Navale extra-high-strength shipbuilding steel) with EN 10204 mill test certificates.

Typical Applications and Service Conditions

RINA Grade D620 (Registro Italiano Navale extra-high-strength shipbuilding steel) plate is ordered for pressure equipment, process vessels, heat-exchanger related fabrications, structural members under the governing code, and project packages that call the grade by name. Match the mill test certificate grade mark to the calculation sheet; do not treat near-equivalents as automatic substitutes.

Service drivers include the design temperature and pressure of the governing code (ASME, EN/PED, class society, or project specification), weld procedure qualification needs, toughness or creep allowables where applicable, and inspection scope. Delivery condition TMCP or QT per RINA-approved route; D quality impact at -20 C should be stated explicitly on the purchase order.

Industry Use Cases

Pressure equipment and process: shells, heads, and related platework when drawings name RINA Grade D620 (Registro Italiano Navale extra-high-strength shipbuilding steel). Power and energy: boiler and heat-recovery fabrications under the ordered edition. Marine / offshore (when classed): only when the society material list names this exact grade stamp. Always keep heat-number traceability on cut pieces.

Chemical Composition - Supporting Data (RINA Grade D620 (Registro Italiano Navale extra-high-strength shipbuilding steel))

Typical RINA D620 ladle practice aligned to IACS H620. Exact chemistry is governed by the RINA-approved production specification - always use the MTC.

Element / rule	Requirement
C, max	0.20
Si	0.10-0.55
Mn, max	1.70
P, max	0.030
S, max	0.030
Al, min	0.015
Nb+V+Ti	microalloy per approved route
Ni / Cr / Mo / Cu / B	optional per approved route

Mechanical Properties - Supporting Data (RINA Grade D620 (Registro Italiano Navale extra-high-strength shipbuilding steel))

Confirm thickness, specimen orientation, and any supplementary impact, UT, or hardness requirements on the PO.

Property	Requirement
Yield ReH, min	620 MPa
Tensile Rm	720-890 MPa
Elongation A, min	15%
Impact KV (D quality, -20 C)	per RINA thickness table (confirm MTC)

Related / Near-Equivalent Grades

Near-equivalents are for cross-reference only. They are not automatic code substitutes. Substitution requires engineer approval and matching certificate scope.

System	Grade	Note
IACS	DH620 / H620	Unified 620 MPa band
ABS/LR/BV/DNV	DH620 family	Sister society grades

Frequently Asked Questions

Where is RINA Grade D620 (Registro Italiano Navale extra-high-strength shipbuilding steel) typically applied?

RINA Grade D620 (Registro Italiano Navale extra-high-strength shipbuilding steel) is applied where design documents, class material lists, or purchaser specs name this grade for pressure, process, structural, or marine fabrications as applicable. Match the MTC marking to the drawing.

What service conditions drive selection of RINA Grade D620 (Registro Italiano Navale extra-high-strength shipbuilding steel)?

Design temperature and pressure, toughness or creep allowables, weldability, corrosion or process media, and the governing code edition drive selection. Delivery condition TMCP or QT per RINA-approved route; D quality impact at -20 C must align with the ordered specification.

Can a near-equivalent replace RINA Grade D620 (Registro Italiano Navale extra-high-strength shipbuilding steel) on an applications drawing?

Not without redesign and written approval. Near-equivalents differ in chemistry, heat treatment, impact temperature, or product form. Commercial swaps create non-conformance when the dossier names RINA Grade D620 (Registro Italiano Navale extra-high-strength shipbuilding steel).

What fabrication notes matter for RINA Grade D620 (Registro Italiano Navale extra-high-strength shipbuilding steel)?

Use approved WPS/PQR packages for the thickness and filler, control heat input, and preserve heat-number traceability on cut pieces. State any supplementary UT, PMI, or impact tests on the purchase order.

What certificate and marking should an applications PO demand?

EN 10204 3.1 is standard; 3.2 when a purchaser-appointed inspector witnesses tests. The MTC should show heat analysis, tensile results, delivery condition, and heat number aligned with RINA Grade D620 (Registro Italiano Navale extra-high-strength shipbuilding steel).

How should I RFQ RINA Grade D620 (Registro Italiano Navale extra-high-strength shipbuilding steel) plate from Gangsteel for a project?

Send RINA Grade D620 (Registro Italiano Navale extra-high-strength shipbuilding steel), thickness x width x length (or nesting list), quantity, delivery condition, optional NDT/PMI, certificate type, destination, and any dual-mark needs. Note the end use when special flatness or cut-to-size packaging is required.

Ordering and Mill Certificates

State grade RINA Grade D620 (Registro Italiano Navale extra-high-strength shipbuilding steel), dimensions, quantity, delivery condition, optional NDT/PMI, and certificate (EN 10204 3.1 standard; 3.2 when third-party inspection is ordered). Gangsteel supplies export plate and related products with mill test certificates. Contact Gangsteel for stock and mill production RFQs.