LR GRADE DH3 Steel Plate Applications & Ordering Guide

LR Grade DH36 (IACS higher-strength) [queue key LR-GRADE-DH3 interpreted as DH36] 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 LR Grade DH36 (IACS higher-strength) [queue key LR-GRADE-DH3 interpreted as DH36] with EN 10204 mill test certificates.

Typical Applications and Service Conditions

LR Grade DH36 (IACS higher-strength) [queue key LR-GRADE-DH3 interpreted as DH36] 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 N / CR / TM / QT per thickness and society approval; killed and fine grain treated should be stated explicitly on the purchase order.

Industry Use Cases

Pressure equipment and process: shells, heads, and related platework when drawings name LR Grade DH36 (IACS higher-strength) [queue key LR-GRADE-DH3 interpreted as DH36]. 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 (LR Grade DH36 (IACS higher-strength) [queue key LR-GRADE-DH3 interpreted as DH36])

IACS higher-strength D36 ladle rules; society stamp required for class use. Queue title/key says DH3; mapped to LR DH36 (IACS D36, -20 deg C, 355 MPa). If the ordered grade is a different DH* designation, correct on MTC/PO - do not invent alternate chem.

Element / rule	Requirement
C, max	0.18%
Mn	0.90-1.60% (AH t<=12.5 mm Mn min may be 0.70%)
Si, max	0.50%
P, max	0.035%
S, max	0.035%
Al (acid soluble), min	0.015% (or total Al >=0.020%)
Nb	0.02-0.05% when used (Nb+V+Ti <=0.12%)
V	0.05-0.10% when used
Ti, max	0.02%
Cu, max	0.35%
Cr, max	0.20%
Ni, max	0.40%
Mo, max	0.08%
Deoxidation	Killed and fine grain treated

Mechanical Properties - Supporting Data (LR Grade DH36 (IACS higher-strength) [queue key LR-GRADE-DH3 interpreted as DH36])

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

Property	Requirement
Yield strength ReH, min	355 MPa
Tensile strength Rm	490-630 MPa
Elongation A5, min	22%
Impact	-20 deg C (typically 34 J long / 24 J trans up to 50 mm)
Delivery	N/CR/TM/QT per thickness and society approval

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
ABS / LR / BV / DNV / NK	DH36 family	Same IACS D36 band
ASTM	A131 Grade DH36	US twin
Related	AH36 / EH36	0 / -40 deg C impact ladder

Frequently Asked Questions

Where is LR Grade DH36 (IACS higher-strength) [queue key LR-GRADE-DH3 interpreted as DH36] typically applied?

LR Grade DH36 (IACS higher-strength) [queue key LR-GRADE-DH3 interpreted as DH36] 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 LR Grade DH36 (IACS higher-strength) [queue key LR-GRADE-DH3 interpreted as DH36]?

Design temperature and pressure, toughness or creep allowables, weldability, corrosion or process media, and the governing code edition drive selection. Delivery condition N / CR / TM / QT per thickness and society approval; killed and fine grain treated must align with the ordered specification.

Can a near-equivalent replace LR Grade DH36 (IACS higher-strength) [queue key LR-GRADE-DH3 interpreted as DH36] 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 LR Grade DH36 (IACS higher-strength) [queue key LR-GRADE-DH3 interpreted as DH36].

What fabrication notes matter for LR Grade DH36 (IACS higher-strength) [queue key LR-GRADE-DH3 interpreted as DH36]?

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 LR Grade DH36 (IACS higher-strength) [queue key LR-GRADE-DH3 interpreted as DH36].

How should I RFQ LR Grade DH36 (IACS higher-strength) [queue key LR-GRADE-DH3 interpreted as DH36] plate from Gangsteel for a project?

Send LR Grade DH36 (IACS higher-strength) [queue key LR-GRADE-DH3 interpreted as DH36], 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 LR Grade DH36 (IACS higher-strength) [queue key LR-GRADE-DH3 interpreted as DH36], 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.