RINA GRADE D620 Equivalents & Cross-Reference

RINA Grade D620 (Registro Italiano Navale extra-high-strength shipbuilding steel) is frequently cross-referenced to related ASTM/ASME, EN, and other designations. This equivalents page leads with that cross-reference map, then summarizes chemistry and mechanical limits used to judge dual marking. Near-equivalents are not automatic code substitutes.

Equivalents and Cross-Reference Map

Use the table for RFQ orientation and dual-cert discussions. True dual certification exists only when one heat meets every chemical and mechanical limit of each named specification on the same MTC. Class society, PED, or ASME dossier wording still controls acceptance.

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

Substitution caveat: Do not swap grades based on marketing strength bands alone. Chemistry, heat treatment, impact temperature, and product form must be reviewed by the responsible engineer before any concession.

Chemical Composition - Base Grade (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 (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)

Frequently Asked Questions

What are the common equivalents for RINA Grade D620 (Registro Italiano Navale extra-high-strength shipbuilding steel)?

Buyers typically cross-reference RINA Grade D620 (Registro Italiano Navale extra-high-strength shipbuilding steel) with the related designations listed in the map above. Related grades in the same family are not automatic substitutes.

Is a near-equivalent always acceptable on an ASME or PED dossier?

No. The material specification listed on the calculation sheet, PED appraisal, or purchaser material list controls acceptance. Certificate marks must match unless a formal concession is approved.

How should dual marking be requested for RINA Grade D620 (Registro Italiano Navale extra-high-strength shipbuilding steel)?

List every required standard on the purchase order and ask the mill to print all approved designations on one MTC only when the heat qualifies against each. Gangsteel confirms which heats can honestly carry those marks before allocation.

What is a safe way to compare RINA Grade D620 (Registro Italiano Navale extra-high-strength shipbuilding steel) with near-equivalents?

Compare chemistry ranges, tensile/yield windows, impact temperature if specified, delivery/heat-treatment practice, and product form side by side. Name-alike grades can still fail dossier acceptance.

Does a sibling class or grade count as an equivalent?

Sibling classes (for example Class 1 vs Class 2, or Grade A vs B) share a family but intentionally different strength or toughness tiers. Ordering the wrong tier undercuts the design assumption.

How do I RFQ RINA Grade D620 (Registro Italiano Navale extra-high-strength shipbuilding steel) when equivalents are also named?

State RINA Grade D620 (Registro Italiano Navale extra-high-strength shipbuilding steel) as the governing grade, then list any dual marks required. Include dimensions, quantity, delivery condition, optional tests, certificate type, destination, and which mark governs acceptance.

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.