SA387Gr11CL2 Steel Plate Applications & Ordering Guide

ASME SA387 / ASTM A387 Grade 11 Class 2 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 ASME SA387 / ASTM A387 Grade 11 Class 2 with EN 10204 mill test certificates.

This page is a standalone technical article. For the primary overview on the original URL, see ASME SA387 / ASTM A387 Grade 11 Class 2 primary specification page.

Typical Applications and Service Conditions

ASME SA387 / ASTM A387 Grade 11 Class 2 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 Per A387/SA387; Grade 11 tempering generally >=620 deg C should be stated explicitly on the purchase order.

Industry Use Cases

Pressure equipment and process: shells, heads, and related platework when drawings name ASME SA387 / ASTM A387 Grade 11 Class 2. 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 (ASME SA387 / ASTM A387 Grade 11 Class 2)

Heat analysis for Grade 11. Product analysis tolerances apply per A387/SA387.

Element / rule	Requirement
C	0.05 to 0.17
Mn	0.40 to 0.65
P	<=0.025
S	<=0.025
Si	0.50 to 0.80
Cr	1.00 to 1.50
Mo	0.45 to 0.65

Mechanical Properties - Supporting Data (ASME SA387 / ASTM A387 Grade 11 Class 2)

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

Property	Requirement
Tensile strength	75 to 100 ksi [515 to 690 MPa]
Yield strength, min	45 ksi [310 MPa]
Elongation in 50 mm, min	22%
Elongation in 200 mm, min	18%
Delivery / HT	Per A387/SA387; Grade 11 tempering generally >=620 deg C

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
ASTM	A387 Grade 11 Class 2	Base ASTM product form
ASME	SA387 Grade 11 Class 2	ASME twin used on Section VIII vessels
ASTM / ASME	A387 / SA387 Grade 11 Class 1	Same chemistry family, lower tensile class
EN 10028-2	13CrMoSi5-5 (approx.)	1.25Cr-Mo-Si European pressure family - confirm edition
ASTM	A387 Grade 12 / 22 Class 2	Related Cr-Mo; different Cr/Mo band - not interchangeable

Frequently Asked Questions

Where is ASME SA387 / ASTM A387 Grade 11 Class 2 typically applied?

ASME SA387 / ASTM A387 Grade 11 Class 2 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: ASME SA387 / ASTM A387 Grade 11 Class 2.

What service conditions drive selection of ASME SA387 / ASTM A387 Grade 11 Class 2?

Design temperature and pressure, toughness or creep allowables, weldability, corrosion or process media, and the governing code edition drive selection. Delivery condition Per A387/SA387; Grade 11 tempering generally >=620 deg C must align with the ordered specification.

Can a near-equivalent replace ASME SA387 / ASTM A387 Grade 11 Class 2 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 ASME SA387 / ASTM A387 Grade 11 Class 2.

What fabrication notes matter for ASME SA387 / ASTM A387 Grade 11 Class 2?

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 ASME SA387 / ASTM A387 Grade 11 Class 2.

How should I RFQ ASME SA387 / ASTM A387 Grade 11 Class 2 plate from Gangsteel for a project?

Send ASME SA387 / ASTM A387 Grade 11 Class 2, 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 ASME SA387 / ASTM A387 Grade 11 Class 2, 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.