What is ASTM A387 Grade 11 Class 2 Steel Plate?
ASTM A387 Grade 11 Class 2 is a chromium-molybdenum alloy steel plate primarily designed for pressure vessels, boilers, and high-temperature service applications.
ASTM A387 Grade 11 Class 2
Supplied in Normalized and Tempered conditions, this steel offers superior tensile strength (75–100 ksi / 515–690 MPa), high yield strength, and excellent resistance to pitting, crevice, and stress corrosion cracking.
GNEE Steel is a leading manufacturer and supplier, providing a wide inventory of ASTM A387 Gr 11 Cl.2 plates globally, including Indonesia, Malaysia, UAE, India, and the USA. Our steel plates meet ASTM, ASME, and API standards and can be supplied with third-party inspection (SGS/BV/Lloyd's).
Applications of ASTM A387 Gr 11 Cl.2 Alloy Steel Plate
- Pressure vessels and industrial boilers
- Heat exchangers and reactors
- Oil & gas processing and refinery equipment
- Petrochemical installations
- High-temperature power plant applications
Specifications & Sizes of ASTM A387 Grade 11 Class 2
Standard: ASTM A387 / ASME SA387
Grade: A387 Gr 11 Class 2
Thickness: 4 – 300 mm
Width: 1500 – 4200 mm
Length: 3000 – 18000 mm
Forms: Coils, foils, rolls, plain sheets, shim sheets, perforated sheets, chequered plates, strips, flats, blank circles, rings/flanges
Surface Finish: Hot rolled (HR), cold rolled (CR), 2B, 2D, BA, Satin, or as per customer request
Heat Treatment: Normalized, Tempered, Quenched & Tempered, Drawing-back
Hardness: Soft, Half-Hard, Hard, Spring-Hard
Chemical Composition of ASTM A387 Grade 11 Cl.2 Plate
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.04 – 0.17 |
| Manganese (Mn) | 0.35 – 0.73 |
| Silicon (Si) | 0.44 – 0.86 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| Chromium (Cr) | 0.94 – 1.56 |
| Molybdenum (Mo) | 0.40 – 0.70 |
Mechanical Properties of ASTM A387 Gr 11 Cl.2
| Property | Class 2 Requirement |
|---|---|
| Tensile Strength | 75–90 ksi / 485–620 MPa |
| Yield Strength | ≥ 45 ksi / ≥ 310 MPa |
| Elongation (200 mm) | ≥ 18% |
| Elongation (50 mm) | ≥ 22% |
Equivalent Grades
| Standard | Equivalent |
|---|---|
| ASTM / ASME | A387 / SA387 Gr 11 Cl.2 |
| UNS | K11789 |
| BS | 621B |
| DIN / EN | – |
Why Choose GNEE for ASTM A387 Gr 11 Cl.2 Plates
- Large global stock ready for immediate delivery
-
Monthly production capacity of 10,000 tons
- Full traceability and inspection reports
- Customized sizes & thickness for OEM projects
- Superior mechanical and chemical consistency
- Fast response and professional technical support
GNEE maintains large inventory for Class 2 plates in all common thicknesses (4 mm – 300 mm), widths (1500 – 4200 mm), and lengths (up to 18,000 mm).
We can supply in Coils, Plates, Shim Sheets, and Chequered Plates with quick shipment to India, UAE, Indonesia, Malaysia, USA, Russia, and more.
For premium quality ASTM A387 Grade 11 Class 2 alloy steel plates with fast delivery, global shipment, and full certification, GNEE Steel is your trusted manufacturer.
Contact us today for the latest ASTM A387 Gr 11 Cl.2 price list and technical datasheet!
Contact us today for the latest ASTM A387 Gr 11 Cl.2 price list
What is ASTM A387 material?
ASTM A387 GR. 91 CL. 2 Alloy Steel Plates manufactured at the world's finest steel mills, this molybdenum-chrome based alloy has excellent resistance to greater working temperatures, making it the right selection for various applications like in gas, oil, chemical, and power generation.
What is ASTM A387 Grade 11 equivalent to?
ASTM A387 grade 11 equivalent steel is ASME SA387 grade 11. ASTM A387 grade 11 covers A387 grade 11 class 1 and A387 grade 11 class 2, which are equivalent to ASME SA387 grade 11 class 1 and SA387 grade 11 class 2 respectively.
What is the difference between ASTM A182 and A387?
A387 is Plate material. A182 is Forging material. You can refer relevant ASTM Book of standards.
What is ASTM A387?
The ASTM A387 specification is the Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum plates used in the application of welded boilers and pressure vessels subjected to elevated temperatures. The two grades SSAB produces are available as Class 1 and/or Class 2.