2304STAINLESS Steel Plate Applications & Ordering Guide

ASTM A240 / ASME SA240 duplex 2304 (UNS S32304 / EN 1.4362) 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 A240 / ASME SA240 duplex 2304 with EN 10204 mill test certificates.

Typical Applications and Service Conditions

ASTM A240 / ASME SA240 duplex 2304 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 Solution annealed should be stated explicitly on the purchase order.

Industry Use Cases

Pressure equipment and process: shells, heads, and related platework when drawings name ASTM A240 / ASME SA240 duplex 2304. 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 A240 / ASME SA240 duplex 2304)

Heat/cast analysis for UNS S32304 (2304). EN 1.4362 windows are similar but not identical (e.g. Mn max 2.00 in EN) - confirm ordered book on MTC.

Element	Min %	Max % / requirement
C	-	<=0.030
Mn	-	<=2.50
Si	-	<=1.00
P	-	<=0.040
S	-	<=0.030
Cr	21.5	24.5
Ni	3.0	5.5
Mo	0.05	0.60
N	0.05	0.20
Cu	0.05	0.60

Mechanical Properties - Supporting Data (ASTM A240 / ASME SA240 duplex 2304)

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

Property	Requirement
Tensile strength, min (A240 annealed)	600 MPa (87 ksi)
Yield strength (0.2% offset), min	400 MPa (58 ksi)
Elongation in 50 mm, min	25%
Hardness, max	290 HBW / 32 HRC
Delivery	Solution annealed

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
UNS	S32304	2304 designation
EN	1.4362 / X2CrNiN23-4	European lean duplex
ASTM	S32205 (2205)	Higher Mo duplex sister - not substitute

Frequently Asked Questions

Where is ASTM A240 / ASME SA240 duplex 2304 typically applied?

ASTM A240 / ASME SA240 duplex 2304 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 ASTM A240 / ASME SA240 duplex 2304?

Design temperature and pressure, toughness or creep allowables, weldability, corrosion or process media, and the governing code edition drive selection. Delivery condition Solution annealed must align with the ordered specification.

Can a near-equivalent replace ASTM A240 / ASME SA240 duplex 2304 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 A240 / ASME SA240 duplex 2304.

What fabrication notes matter for ASTM A240 / ASME SA240 duplex 2304?

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 A240 / ASME SA240 duplex 2304.

How should I RFQ ASTM A240 / ASME SA240 duplex 2304 plate from Gangsteel for a project?

Send ASTM A240 / ASME SA240 duplex 2304 (UNS S32304 / EN 1.4362), 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 A240 / ASME SA240 duplex 2304 (UNS S32304 / EN 1.4362), 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.