ASTM A387 Steel Plate Applications & Ordering Guide

ASTM A387 / ASME SA387 chromium-molybdenum pressure-vessel plate family 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 A387 / ASME SA387 chromium-molybdenum pressure-vessel plate family with EN 10204 mill test certificates.

Typical Applications and Service Conditions

ASTM A387 / ASME SA387 chromium-molybdenum pressure-vessel plate family 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 Annealed, N+T, or accelerated cool + temper per grade should be stated explicitly on the purchase order.

Industry Use Cases

Pressure equipment and process: shells, heads, and related platework when drawings name ASTM A387 / ASME SA387 chromium-molybdenum pressure-vessel plate family. 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 A387 / ASME SA387 chromium-molybdenum pressure-vessel plate family)

Overview entry for ASTM A387 family pages. Example chem/mech are Grade 11 Class 2. Do not treat as a single chem for all A387 grades; confirm ordered Grade and Class on the MTC.

Element / rule	Requirement
Family	Grade-specific (Gr2/11/12/22/91 etc.) - see ordered grade
Example Gr11 Cl2 Cr	1.00-1.50
Example Gr11 Cl2 Mo	0.45-0.65
P, max (modern editions)	0.025
S, max (modern editions)	0.025

Mechanical Properties - Supporting Data (ASTM A387 / ASME SA387 chromium-molybdenum pressure-vessel plate family)

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

Property	Requirement
Example Gr11 Cl2 tensile	75-100 ksi [515-690 MPa] (Class 2)
Example Gr11 Cl2 yield, min	45 ksi [310 MPa]
Note	Always confirm the ordered Grade and Class on the MTC

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	SA387 same grade/class	ASME twin
EN 10028-2	13CrMo4-5 / 10CrMo9-10 family	Approximate European Cr-Mo

Frequently Asked Questions

Where is ASTM A387 / ASME SA387 chromium-molybdenum pressure-vessel plate family typically applied?

ASTM A387 / ASME SA387 chromium-molybdenum pressure-vessel plate family 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 A387 / ASME SA387 chromium-molybdenum pressure-vessel plate family?

Design temperature and pressure, toughness or creep allowables, weldability, corrosion or process media, and the governing code edition drive selection. Delivery condition Annealed, N+T, or accelerated cool + temper per grade must align with the ordered specification.

Can a near-equivalent replace ASTM A387 / ASME SA387 chromium-molybdenum pressure-vessel plate family 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 A387 / ASME SA387 chromium-molybdenum pressure-vessel plate family.

What fabrication notes matter for ASTM A387 / ASME SA387 chromium-molybdenum pressure-vessel plate family?

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 A387 / ASME SA387 chromium-molybdenum pressure-vessel plate family.

How should I RFQ ASTM A387 / ASME SA387 chromium-molybdenum pressure-vessel plate family plate from Gangsteel for a project?

Send ASTM A387 / ASME SA387 chromium-molybdenum pressure-vessel plate family, 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 A387 / ASME SA387 chromium-molybdenum pressure-vessel plate family, 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.