If your project requires ASTM A387 Grade 11 Class 1 alloy steel plate for elevated temperature and pressure vessel service, GNEE is your reliable manufacturer and global supplier.
ASTM A387 Grade 11 Class 1 alloy steel plate
ASTM A387 Grade 11 Class 1 alloy steel plates are specially designed for high-temperature applications where strength, oxidation resistance, and corrosion resistance are critical. As a professional pressure vessel steel supplier, we provide full mill test certification and support third-party inspection.
Applications of ASTM A387 Grade 11 Class 1 Alloy Steel Plate
ASTM A387 Grade 11 Class 1 is widely used in industries operating under high temperature and pressure conditions:
- Oil & gas processing equipment
- Petrochemical reactors and heat exchangers
- Boilers and pressure vessels
- Sour gas and hydrogen service environments
- Refinery storage tanks and separators
The chromium and molybdenum alloying system ensures excellent performance under long-term thermal exposure.
Why Choose ASTM A387 Grade 11 for High-Temperature Service
Excellent Heat and Oxidation Resistance
- Chromium content enhances oxidation resistance at elevated temperatures
- Molybdenum improves creep strength and thermal stability
- Ideal for continuous high-temperature pressure vessel operation
Superior Corrosion Resistance for Sour Gas Applications
- Chromium improves resistance to sulfidation and corrosion
- Suitable for aggressive chemical and sour gas environments
- Proven performance in petrochemical service
ASTM A387 Grade 11 Class 1 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 |
| Sulphur (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 |
Mechanical Properties of ASTM A387 Grade 11 Class 1 Plate
| Property | Requirement |
|---|---|
| Tensile Strength | 75–100 ksi (515–690 MPa) |
| Yield Strength (0.2% offset) | ≥ 43 ksi (310 MPa) |
| Elongation (200 mm) | ≥ 18% |
| Elongation (50 mm) | ≥ 22% |
These mechanical properties ensure reliable performance under pressure and thermal stress.
Chromium & Molybdenum Content of ASTM A387 Grade 11
| Grade | Nominal Chromium (%) | Nominal Molybdenum (%) |
|---|---|---|
| A387 Grade 11 | 1.25 | 0.50 |
The Cr-Mo alloy system is essential for maintaining strength and corrosion resistance at high temperatures.
ASTM A387 Grade 11 Steel Plate Equivalents
| Standard | Grade |
|---|---|
| BS | 621 B |
| ASTM / ASME | A387 Grade 11 Class 1 |
| EN | ––– |
| DIN | ––– |
Supply Capabilities of ASTM A387 Grade 11 Alloy Steel Plate
- Plates in normalized or normalized & tempered condition
- Full EN / ASTM / ASME compliance
- Third-party inspection: SGS, BV, TUV, LR
- Custom cutting, heat treatment, and surface processing
As a trusted manufacturer, GNEE supplies certified ASTM A387 Grade 11 Class 1 alloy steel plates for pressure vessels and high-temperature service worldwide.Our products meet strict petrochemical and refinery standards, ensuring safety, durability, and cost efficiency.
Contact us for the latest ASTM A387 Grade 11 Class 1 alloy steel plate price list and technical datasheets today.
Contact us for latest ASTM A387 Grade 11 Class 1 alloy steel plate 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.