P355QH STEEL PLATE Steel Plate Applications & Ordering Guide

EN 10028-6 P355QH (1.8867) 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 EN 10028-6 P355QH (1.8867) with EN 10204 mill test certificates.

Typical Applications and Service Conditions

EN 10028-6 P355QH (1.8867) 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 Quenched and tempered (+QT) should be stated explicitly on the purchase order.

Industry Use Cases

Pressure equipment and process: shells, heads, and related platework when drawings name EN 10028-6 P355QH (1.8867). 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 (EN 10028-6 P355QH (1.8867))

Cast analysis maxima for P355QH under EN 10028-6. Confirm ordered edition; some reprints list S max 0.010.

Element / rule	Requirement
C, max	0.16
Si, max	0.40
Mn, max	1.50
P, max	0.025
S, max	0.015
N, max	0.015
Cr, max	0.30
Mo, max	0.25
Cu, max	0.30
Ni, max	0.50
Nb, max	0.05
V, max	0.06
Ti, max	0.03
B, max	0.005

Mechanical Properties - Supporting Data (EN 10028-6 P355QH (1.8867))

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

Property	Requirement
Yield ReH, min (t<=50 mm)	355 MPa
Yield ReH, min (50 < t <=100 mm)	335 MPa
Yield ReH, min (100 < t <=150 mm)	315 MPa
Tensile Rm (t<=100 mm)	490-630 MPa
Tensile Rm (100 < t <=150 mm)	450-590 MPa
Elongation A, min	22%
Impact KV at -20 C (QH), min	27 J (transverse typical)

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
EN	P355Q / P355QL1 / P355QL2	Same strength, different impact quality
EN	P460QH family	Higher yield QT sister

Frequently Asked Questions

Where is EN 10028-6 P355QH (1.8867) typically applied?

EN 10028-6 P355QH (1.8867) 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 EN 10028-6 P355QH (1.8867)?

Design temperature and pressure, toughness or creep allowables, weldability, corrosion or process media, and the governing code edition drive selection. Delivery condition Quenched and tempered (+QT) must align with the ordered specification.

Can a near-equivalent replace EN 10028-6 P355QH (1.8867) 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 EN 10028-6 P355QH (1.8867).

What fabrication notes matter for EN 10028-6 P355QH (1.8867)?

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 EN 10028-6 P355QH (1.8867).

How should I RFQ EN 10028-6 P355QH (1.8867) plate from Gangsteel for a project?

Send EN 10028-6 P355QH (1.8867), 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 EN 10028-6 P355QH (1.8867), 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.