A387 Grade 11 Class 1 Cr-Mo alloy steel plate is a chromium-molybdenum pressure vessel steel specifically developed for welded boilers and pressure vessels operating at elevated temperatures.
A387 Grade 11 Class 1 Cr-Mo alloy steel plate
As a professional steel plate manufacturer and global supplier, GNEE supplies ASTM A387 Grade 11 Class 1 steel plates with stable quality, full certification, and reliable delivery for energy and industrial projects worldwide.
Within the first 100 words, it is important to clarify that GNEE is a manufacturer-oriented supplier, not a trading intermediary. Our A387 Grade 11 Class 1 plates are produced under strict process control and supplied in hot rolled condition with clean surface treatment, ensuring excellent weldability and long-term service stability in high-temperature environments.
A387 Grade 11 Class 1 Steel Plate Metallurgical Characteristics
A387 Grade 11 Class 1 is a fine-grain chromium-molybdenum alloy steel. The alloying elements play a critical role in strengthening and corrosion resistance.
Chromium (Cr) provides solid solution strengthening and significantly improves oxidation and corrosion resistance.
Molybdenum (Mo) enhances high-temperature strength and improves tempering stability.
Fine-grain strengthening improves toughness and long-term structural reliability.
With a typical chromium content around 1.25% and molybdenum content around 0.5%, A387 Grade 11 Class 1 steel plates are particularly suitable for high-temperature pressure equipment, including boilers and pressure vessels in oil, gas, and petrochemical industries.
A387 Grade 11 Class 1 Cr-Mo Alloy Steel Plate Technique
A387 Grade 11 Class 1 Cr-Mo alloy steel plates are manufactured using controlled hot rolling techniques to ensure uniform mechanical performance across the plate thickness.
Technical highlights include:
- Hot rolled production process
- Fine grain strengthening structure
- Stable tempering behavior
- Thickness capability limited only by mechanical property requirements
The maximum plate thickness is determined by the ability of the steel composition and rolling process to meet specified mechanical properties, ensuring consistent performance even in thicker sections.
A387 Grade 11 Class 1 Steel Plate Specifications and Sizes
GNEE supplies A387 Grade 11 Class 1 steel plates in a wide range of dimensions to support different fabrication and engineering needs.
Size Specification Table
| Item | Specification |
|---|---|
| Thickness | 0.3 – 80 mm |
| Width | 2 m / 2.44 m / 3 m / Customized |
| Length | 6 m / 8 m / 10 m / 12 m / Customized |
| Technique | Hot Rolled |
| Surface Treatment | Clean |
| Delivery | Timely and fast |
Processing services such as cutting, drilling, welding, grinding, and machining can be provided upon request.
Chemical Composition of A387 Grade 11 Class 1 Steel Plate
The chemical composition of A387 Grade 11 Class 1 steel plate is strictly controlled to balance strength, weldability, and corrosion resistance.
Chemical Composition (%)
| C | Mn | P | S | Si | Cr | Mo |
|---|---|---|---|---|---|---|
| 0.05–0.17 | 0.40–0.65 | ≤0.035 | ≤0.035 | 0.50–0.80 | 1.00–1.50 | 0.45–0.65 |
This optimized Cr-Mo composition ensures excellent resistance to oxidation, pitting corrosion, crevice corrosion, and stress corrosion cracking.
Applications of A387 Grade 11 Class 1 Cr-Mo Alloy Steel Plate
A387 Grade 11 Class 1 steel plates are primarily intended for welded boilers and pressure vessels designed for elevated temperature service.
Typical applications include:
- Industrial boilers and boiler drums
- Pressure vessels and reactors
- Heat exchangers
- Oil & gas processing equipment
- Petrochemical and refinery installation
These applications require materials that can withstand high temperature, pressure, and corrosive environments over long service periods.
As a reliable manufacturer and exporter, GNEE supplies A387 Grade 11 Class 1 Cr-Mo alloy steel plate with stable chemical composition, controlled rolling quality, and consistent performance for high-temperature pressure vessel applications. We ensure smooth project execution through professional service, flexible sizing, and fast delivery.
Contact us for the latest A387 Grade 11 Class 1 Cr-Mo alloy steel plate price list, technical datasheet, and delivery schedule.
Contact us for latest A387 Grade 11 Class 1 Cr-Mo 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.