ASME SA387 Grade 11 Class 2 Steel Plate is a chromium-molybdenum (Cr-Mo) alloy steel plate specifically engineered for elevated temperature pressure vessel applications.
ASME SA387 Grade 11 Class 2 Steel Plate
Compared with conventional carbon steels, SA387 Grade 11 CL2 offers superior oxidation resistance, high-temperature strength, and long-term durability, making it an ideal material for critical equipment in oil & gas, petrochemical, and power industries.
Chemical Composition of SA387 Grade 11 CL2
The balanced Chromium and Molybdenum content ensures excellent thermal stability and corrosion resistance:
| Element | Content (%) |
|---|---|
| Chromium (Cr) | 1.00 – 1.50 |
| Molybdenum (Mo) | 0.45 – 0.65 |
| Carbon (C) | ≤ 0.15 |
| Manganese (Mn) | 0.40 – 0.70 |
The Cr-Mo alloy system enhances oxidation resistance and creep strength, allowing the material to perform reliably under prolonged high-temperature service.
Mechanical Properties of SA387 Grade 11 Class 2
| Property | Value |
|---|---|
| Yield Strength | ≥ 205 MPa |
| Tensile Strength | ≥ 415 MPa |
| Elongation | ≥ 18% (typical) |
Class 2 plates undergo additional heat treatment, resulting in improved strength, toughness, and stability compared to Class 1.
Heat Treatment Requirements
To achieve optimal mechanical performance, SA387 Grade 11 CL2 must be properly heat treated:
| Grade | Minimum Tempering Temperature |
|---|---|
| SA387 Gr.11 CL2 | 620°C (1150°F) |
Comparison of SA387 Grades (Cr-Mo Content)
| Grade | Chromium (%) | Molybdenum (%) |
|---|---|---|
| 11 | 1.25 | 0.50 |
| 22 / 22L | 2.25 | 1.00 |
| 5 | 5.00 | 0.50 |
| 9 | 9.00 | 1.00 |
| 91 | 9.00 | 1.00 |
Among these, SA387 Grade 11 CL2 provides a balanced combination of cost, strength, and heat resistance, making it one of the most widely used grades.
Applications of SA387 Grade 11 CL2
This alloy steel plate is widely used in high-temperature and high-pressure environments, including:
Pressure vessels in oil & gas industry
Boilers and steam systems
Heat exchangers
High-temperature pipelines
Sour service and corrosive environments
Thanks to its chromium content, SA387 Grade 11 CL2 also delivers excellent resistance to oxidation and corrosion, suitable for long-term service in harsh conditions.
| Item | Details |
|---|---|
| Product | ASME SA387 Alloy Steel Plate |
| Grades | Gr.11, Gr.22, Gr.12, Gr.5, Gr.9, Gr.91 |
| Thickness | 5 – 150 mm |
| Width | 600 – 3000 mm |
| Length | 6000 mm, 12000 mm, customized |
| Delivery Condition | Hot rolled + Heat treated |
| Surface | Natural / Painted |
| Processing | Laser cutting, Plasma cutting, CNC cutting |
| Packing | Standard seaworthy packing |
Why Choose SA387 Grade 11 CL2 Instead of SA516?
- Better high-temperature resistance (up to 600°C+)
- Superior creep strength and oxidation resistance
- Longer service life in harsh environments
- Reduced maintenance and replacement costs
For critical pressure vessel applications, SA387 Grade 11 CL2 is a more reliable and cost-effective long-term solution.
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What is SA 387 GR 12 material?
Engineered for use in elevated temperature service, ASME SA387 Grade 12 is a chrome molybdenum carbon alloy steel for use in weldable pressure vessels and industrial boilers.
What is the difference between A387 GR 11 and A387 GR 22?
Grade 11: Contains approximately 1% chromium and 0.5% molybdenum. Grade 22: Contains about 2.25% molybdenum and 1% chromium. This higher molybdenum content enhances its strength and resistance to high temperatures.
Is SA 387 low alloy steel?
ASTM A387, ASME SA 387, is one of our most popular products. It is a Low Alloy sSteel pressure vessel quality steel for high temperatures. We have a wide range of plate sizes available and Thickness range from 6 - 100mm.
What is SA 387 GR 11 Cl 2 equivalent material?
Sa 387 Gr 11 Equivalent Material is the ASME SA387 in the US markets with the European Union having modules in 13CrMoSi5-5 grade. The Sa 387 Gr 11 Cl 2 Equivalent Material is the SA387-11-2 of the ASME and ASTM standard.
What is the temperature range for SA 387 GR 11?
In the lower end of the temperature range SA 387 Gr 11 (1150 °F min tempering temperature) , and SA 387 Gr 22 (1250 °F min tempering temperature) are used. These grades can be specified in either class 1 or 2 and can also be provided in the Normalized & Tempered or Quenched and Tempered.