SA 387 Gr 11: Characteristics, Properties, and Analogues

  ↵

SA 387 Grade 11 is a chromium-molybdenum (Cr-Mo) alloy steel plate specifically designed for pressure vessels and equipment operating at elevated temperatures. Thanks to its excellent heat resistance, mechanical strength, and long-term stability, it is widely used in refineries, petrochemical plants, power generation, and chemical processing industries.

As a professional pressure vessel steel plate expert and supplier, GNEE Steel provides this comprehensive guide to the characteristics, properties, and international analogues of SA 387 Gr 11, helping engineers and buyers make confident, code-compliant material choices.

Overview of SA 387 Grade 11 Steel Plate

SA 387 is the ASME specification corresponding to ASTM A387 and is listed in ASME Section II, Part A for pressure vessel applications.

Grade 11: 1.25% Chromium – 0.5% Molybdenum alloy steel

Available in:

Class 1: As-rolled or normalized

Class 2: Normalized and tempered (N+T)

📌 Engineering Note:
Class 2 is more commonly specified for high-temperature and high-pressure service due to its superior strength and toughness.

Key Characteristics of SA 387 Gr 11

SA 387 Gr 11 is engineered to perform reliably under demanding thermal and pressure conditions.

Main Characteristics:

Excellent high-temperature strength

Good creep resistance during long-term service

Strong oxidation and corrosion resistance

Good resistance to hydrogen attack

Stable microstructure after post-weld heat treatment (PWHT)

These characteristics make SA 387 Gr 11 an ideal material for ASME-coded pressure vessels.

Chemical Composition (Typical, %)

Mechanical Properties (Typical)

SA 387 Gr 11 Class 2 (N+T)

Temperature and Service Performance

Recommended service temperature: up to 540°C (1000°F)

Suitable for continuous high-temperature operation

Maintains strength better than carbon steel pressure vessel plates

Reliable performance in refinery and petrochemical environments

For higher-temperature applications, higher-alloy grades such as SA 387 Gr 22 or Gr 91 may be considered.

Typical Applications of SA 387 Gr 11

SA 387 Grade 11 steel plates are widely used in:

Pressure vessel shells and heads

Shell & tube heat exchangers

Reactors and separators

Boilers and steam drums

Petrochemical and refinery process units

Hydrogenation and high-temperature service equipment

International Analogues (Equivalent Grades)

SA 387 Gr 11 has several well-recognized international equivalents, making it suitable for global EPC projects.

📌 Important:
While these grades are chemically and mechanically similar, formal substitution must always be approved by the governing design code and end user.

Why Choose GNEE Steel for SA 387 Gr 11 Plates?

As a trusted 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

Global export experience since 2008

We provide technical support and material selection guidance to ensure compliance with ASME and international standards.

Contact GNEE Steel – Your Reliable SA 387 Gr 11 Supplier

Understanding the characteristics, properties, and analogues of SA 387 Gr 11 is essential for safe and efficient pressure vessel design.
Let GNEE Steel support your project with high-quality materials and expert service.

Request A Quote

📩 Contact us today for pricing, datasheets, or a professional technical consultation.

GNEE Steel – Progress a Little Every Day.

GNEE Steel also supplies a variety of boilers and pressure vessel steel plates, such as A204 Grade B,A515 Grade 70,A537 Class 1,SA387 Grade 11 Class 1,P265GH,S537 Class 2,P355Q,P275N,P355N,P690Q,Q345R, etc. If you want to know more about other types of steel plates, you can call the consultation hotline at +8615824687445 or send an email to alloy@gneesteelgroup.com. You are welcome to consult us, and we are very willing to answer your questions.