What is ASTM A387 Grade 11 Class 2 Steel Plate?
ASTM A387 Grade 11 Class 2 is a chromium-molybdenum (Cr-Mo) alloy steel plate designed for high-temperature pressure vessels. Following ASTM A387/A387M standards, this steel contains 1.00–1.50% chromium and 0.45–0.65% molybdenum, providing excellent creep resistance, corrosion resistance, and durability.
Delivered in a normalized and tempered state with a minimum tempering temperature of 620 °C, A387 Gr 11 Cl.2 plates have:
- Tensile strength: ≥ 440 MPa
- Yield strength: ≥ 295 MPa
- Impact energy: ≥ 94 J
Compared to Class 1 plates, Class 2 achieves higher strength through stricter heat treatment processes, making it ideal for reactors, heat exchangers, and other critical equipment.
ASTM A387 Grade 11 Class 2
GNEE Steel is a professional manufacturer and supplier of ASTM A387 Grade 11 Class 2 plates, providing high-quality plates with fast global delivery.
Applications of A387 Grade 11 Class 2 Alloy Steel Plate
ASTM A387 Gr 11 Cl.2 plates are widely used in:
- Hydrogenation reactors and high-pressure vessels
- Boiler drums and heat exchangers
- Petrochemical and refinery equipment
- Power generation plants and industrial boilers
- Environments with medium-high temperatures (350–480 °C)
- Hydrogen-rich atmospheres requiring low temper brittleness
- Domestic equivalent: 14Cr1MoR
Chemical Composition (%)
| 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) | 1.00 – 1.50 |
| Molybdenum (Mo) | 0.45 – 0.65 |
Mechanical Properties
| Property | ASTM A387 Gr 11 Cl.2 Requirement |
|---|---|
| Tensile Strength | ≥ 440 MPa |
| Yield Strength | ≥ 295 MPa |
| Impact Energy | ≥ 94 J |
| Operating Temperature | 350 – 480 °C |
Why Choose GNEE Steel for ASTM A387 Grade 11 Cl.2 Plates
- Premium quality alloy steel with high creep and corrosion resistance
- Large stock and fast delivery worldwide
- Fully certified, traceable, and tested
- Supports custom sizes, cutting, and fabrication
- Expert technical support for petrochemical and power applications
For ASTM A387 Grade 11 Class 2 alloy steel plates suitable for high-temperature pressure vessels, boilers, and reactors, GNEE Steel is a reliable manufacturer and global supplier.
📩 Contact us today for the latest ASTM A387 Gr 11 Cl.2 price list and detailed 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.