ASTM A387 Grade 11 Class 2 steel plates are high-strength chromium-molybdenum alloy steel designed for pressure vessels and boilers used in elevated temperature service.
ASTM A387 Grade 11 Class 2 steel plates
This grade is widely applied in industries such as oil, gas, petrochemical, power generation, and chemical processing, where liquids and gases are often stored under high temperature and pressure conditions.
The elevated chromium content provides excellent corrosion and oxidation resistance, making it ideal for sour gas applications and other environments with aggressive media.
Key Features of ASTM A387 Grade 11 Class 2 Plates
- High tensile and yield strength: Suitable for high-pressure service
- Corrosion and oxidation resistance: Chromium-molybdenum alloy ensures long-term durability in elevated temperatures
- Good ductility and toughness: Meets elongation requirements for safe pressure vessel operation
- Weldable and formable: Supports cutting, welding, milling, and other fabrication processes
- Reliable performance: Designed for boilers, pressure vessels, and industrial equipment exposed to heat and corrosive environments
ASTM A387 Grade 11 Class 2 Steel Plate Technical Specifications
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| BS | 621 B |
| EN | ––– |
| ASTM/ASME | A387 Grade 11 Class 2 |
| DIN | ––– |
Chromium & Molybdenum Content
| Designation | Nominal Chromium Content (%) | Nominal Molybdenum Content (%) |
|---|---|---|
| ASTM A387 Grade 11 | 1.25 | 0.50 |
Mechanical Properties
| Designation | Tensile Strength (ksi / MPa) | Yield Strength (ksi / MPa) | Elongation 8 in. [%] | Elongation 2 in. [%] |
|---|---|---|---|---|
| ASTM A387 Grade 11 | 75–100 / 515–690 | 43 / 310 | 18 | 22 |
Chemical Composition
| Element | Heat Analysis (%) | Product Analysis (%) |
|---|---|---|
| Carbon (C) | 0.05–0.17 | 0.04–0.17 |
| Manganese (Mn) | 0.40–0.65 | 0.35–0.73 |
| Phosphorus (P) | 0.035 | 0.035 |
| Sulfur (S) | 0.035 | 0.035 |
| Silicon (Si) | 0.50–0.80 | 0.44–0.86 |
| Chromium (Cr) | 1.00–1.50 | 0.94–1.56 |
| Molybdenum (Mo) | 0.45–0.65 | 0.45–0.70 |
Applications of ASTM A387 Grade 11 Class 2 Alloy Steel Plates
Welded Boilers – Steam and hot water boilers for industrial and power generation applications
Pressure Vessels – Chemical, petrochemical, and oil & gas storage vessels
High-Temperature Components – Industrial equipment exposed to elevated temperatures and high pressure
Sour Gas Service – Ideal for environments requiring resistance to oxidation and corrosion
Why Choose ASTM A387 Grade 11 Class 2 Steel Plates
Superior mechanical properties: Withstand high pressure and temperature service
- Corrosion and oxidation resistance: Ensures long-term reliability in harsh environments
- Versatile fabrication: Supports welding, cutting, and other processing methods
- Compliance with standards: Meets ASTM A387, ASME specifications, and internationally recognized equivalents
- Trusted by industry: Used globally in critical applications for oil, gas, and chemical industries
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What is A387 material?
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.
What is a A387 steel equivalent to?
Other designations that are equivalent to AISI A387 grade 22-PVQ alloy steel include the following: ASTM A182 (F22-1) ASTM A199 (T22)
What is A387 grade 22 material?
ASTM A387 Grade 22 (ASME SA387 Grade 22) is Chrom-Moly steel plate used for making boilers and pressure vessles designed for high temperature high pressure serivce, chrome content at 2.00% to 2.50%, and Moly 0.90% to 1.10% for SA387 GRADE 22 material.
What is the chemical composition of ASTM A387 Grade 12?
ASTM A387 GR 12 CL 2 Plates is designed with chemical components such as silicon, chromium, vanadium, molybdenum, sulfur, phosphorus, carbon, and manganese. Alloy Gr 12 has some tensile requirements, such as tensile strength, area reduction, elongation, and yield strength.
What is the difference between ASTM A182 and A387?
Both ASTM A182 grade F11 class 2 and ASTM A387 grade 22 steel are iron alloys. They have a very high 99% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.