Description of SA 387 Gr 11 Hot Rolled Boiler Steel Plate

As a professional pressure vessel steel plate supplier, GNEE Steel provides the following detailed description of SA 387 Grade 11 hot rolled boiler steel plate, helping global buyers and engineers select the right material with confidence.

Overview of SA 387 Gr 11 Hot Rolled Steel Plate

SA 387 Grade 11 is specified under ASME Section II, Part A and is the ASME-approved version of ASTM A387. It is produced by the hot rolling process, ensuring excellent internal quality and uniform mechanical properties.

Material type: Cr-Mo alloy boiler & pressure vessel steel

Alloy system: 1.25% Chromium – 0.5% Molybdenum

Delivery condition:

Class 1 – As-rolled or normalized

Class 2 – Normalized and tempered (N+T)

📌 Industry Practice:
For most boiler and high-temperature pressure vessel applications, Class 2 (N+T) is recommended due to higher strength and better toughness.

Chemical Composition (Typical, %)

The controlled Cr-Mo composition provides excellent heat resistance, oxidation resistance, and creep strength, which are essential for boiler service.

Mechanical Properties (Typical)

SA 387 Gr 11 Class 2

These properties ensure stable performance under high pressure and elevated temperature, even during long-term operation.

Typical Applications

SA 387 Gr 11 hot rolled boiler steel plates are widely used in:

Industrial boilers and steam drums

Pressure vessel shells and heads

Shell & tube heat exchangers

Power plant equipment

Refinery and petrochemical process units

High-temperature piping components

These applications demand materials with proven thermal stability and mechanical reliability.

Equivalent and Comparable Grades

SA 387 Gr 11 is commonly compared with:

ASTM A387 Grade 11

EN 10028-2 13CrMo4-5 (1.7335)

DIN 13CrMo4-5

GB 713 12Cr1MoVR

JIS G3118 SCMV2

Such equivalence enables flexible sourcing for international boiler and pressure vessel projects, subject to code approval.

Why Choose GNEE Steel for SA 387 Gr 11 Plates?

As an experienced boiler and pressure vessel steel plate supplier, GNEE Steel offers:

SA 387 Grade 11 Class 1 & Class 2 plates

Thickness range: 6 mm – 150 mm

Normalized & Tempered (N+T) supply

EN 10204 3.1 / 3.2 mill test certificates

UT, PMI, impact testing, PWHT simulation

Cutting, beveling, and machining services

Reliable global delivery since 2008

We support EPC contractors, boiler manufacturers, and fabricators with technical expertise and stable quality control.

Contact GNEE Steel – Your Trusted Boiler Steel Plate Partner

Understanding the description and performance of SA 387 Gr 11 hot rolled boiler steel plate is essential for safe and efficient boiler and pressure vessel design.

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What is the P number of SA 387 GR 11 material?

The ASME SA-387/ ASTM A387 Gr. 11 steel has the nominal composition of 1.25Cr-0.5Mo-Si with UNS designation number of K11789 and P number of 4.

What is SA 387 GR 11 CL 2 equivalent to?

ASME SA387

Sa 387 Gr 11 Equivalent Material is the ASME SA387 in the US markets with the European Union having modules in 13CrMoSi5-5 grade. The Sa 387 Gr 11 Cl 2 Equivalent Material is the SA387-11-2 of the ASME and ASTM standard.

What is the difference between SA 387 Grade 11 CL 1 and Class 2?

The difference between SA 387 Grade 11 Class 1 and Class 2 Plate lies in their mechanical properties. However, they both have the same chemical composition. The tensile strength and yield strength of class 2 material is higher than that of class 1, whereas the elongation for class 1 is higher compared to class 2.

What is SA 387 material?

The ASME SA387 standard covers the supply of weldable chrome molybdenum alloy steel plates for pressure vessels used in elevated temperature service. The added molybdenum and chromium provides excellent corrosion resistance and high temperature resistance respectively.