A302 Grade D Steel Plate Applications & Ordering Guide

ASTM A302 / A302M Grade D (ASME SA302 Grade D) 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 ASTM A302 / A302M Grade D (ASME SA302 Grade D) with EN 10204 mill test certificates.

This page is a standalone technical article. For the primary overview on the original URL, see ASTM A302 / A302M Grade D (ASME SA302 Grade D) primary specification page.

Typical Applications and Service Conditions

ASTM A302 / A302M Grade D (ASME SA302 Grade D) 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 As required by A302/A20 (killed, fine grain); heat treatment per ordered edition / A20 should be stated explicitly on the purchase order.

Industry Use Cases

Pressure equipment and process: shells, heads, and related platework when drawings name ASTM A302 / A302M Grade D (ASME SA302 Grade D). 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 (ASTM A302 / A302M Grade D (ASME SA302 Grade D))

Heat and product analyses per A302/A302M. Grade D is the higher-nickel Mn-Mo-Ni grade.

Element / rule	Requirement
C, max (t<=25 mm)	0.20
C, max (25 < t <= 50 mm)	0.23
C, max (t>50 mm)	0.25
Mn	1.07-1.62
P, max	0.025
S, max	0.025
Si	0.13-0.45
Mo	0.41-0.64
Ni	0.67-1.03

Mechanical Properties - Supporting Data (ASTM A302 / A302M Grade D (ASME SA302 Grade D))

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

Property	Requirement
Tensile strength	80-100 ksi [550-690 MPa]
Yield strength, min	50 ksi [345 MPa]
Elongation in 200 mm, min	17%
Elongation in 50 mm, min	20%
Min thickness	0.25 in [6.5 mm]

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
ASME	SA302 Grade D	ASME twin
ASTM	A302 Grade C	Lower Ni band; same tensile class
ASTM	A302 Grade B	No Ni requirement

Frequently Asked Questions

Where is ASTM A302 / A302M Grade D (ASME SA302 Grade D) typically applied?

ASTM A302 / A302M Grade D (ASME SA302 Grade D) 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. Primary overview: ASTM A302 / A302M Grade D (ASME SA302 Grade D).

What service conditions drive selection of ASTM A302 / A302M Grade D (ASME SA302 Grade D)?

Design temperature and pressure, toughness or creep allowables, weldability, corrosion or process media, and the governing code edition drive selection. Delivery condition As required by A302/A20 (killed, fine grain); heat treatment per ordered edition / A20 must align with the ordered specification.

Can a near-equivalent replace ASTM A302 / A302M Grade D (ASME SA302 Grade D) 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 ASTM A302 / A302M Grade D (ASME SA302 Grade D).

What fabrication notes matter for ASTM A302 / A302M Grade D (ASME SA302 Grade D)?

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 ASTM A302 / A302M Grade D (ASME SA302 Grade D).

How should I RFQ ASTM A302 / A302M Grade D (ASME SA302 Grade D) plate from Gangsteel for a project?

Send ASTM A302 / A302M Grade D (ASME SA302 Grade D), 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 ASTM A302 / A302M Grade D (ASME SA302 Grade D), 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.