SA387Gr91CL2 pressure vessel plate and SA387Gr22CL2 pressure vessel plate are two types of chromium-molybdenum alloy steel plates, commonly used in boilers and pressure vessels operating under high temperature and high pressure. They differ significantly in composition, performance, and applications.
Below are the main distinctions between the two materials:
Chemical Composition and Mechanical Properties Between SA387Gr91CL2 and SA387Gr22CL2
| Category | SA387Gr91CL2 pressure vessel plate | SA387Gr22CL2 hot-rolled plate |
|---|---|---|
| Chromium (Cr) | 8.0–9.5% (higher content, provides superior oxidation & corrosion resistance) | 2.0–2.5% (lower, moderate oxidation resistance) |
| Molybdenum (Mo) | 0.85–1.05% | 0.9–1.1% |
| Other Elements | Contains small amounts of V, W, N → improve creep resistance & high-temp strength | Mainly ferrite + pearlite structure, simpler composition |
| Creep Strength | Higher, suitable for continuous service under elevated temperatures | Lower, not as durable under long-term high-temp service |
| Tensile & Yield Strength | Higher tensile and yield strength | Moderate tensile and yield strength |
| Best Application Range | High-temp, high-pressure (supercritical boilers, nuclear power, petrochemicals) | Medium temp & pressure (conventional boilers, pressure vessels, exchangers) |
Application Fields
SA387Gr91CL2:
Widely used in supercritical and ultra-supercritical boilers, nuclear power equipment, and other high-temperature, high-pressure environments.
Best suited for applications requiring high strength and long-term durability.
SA387Gr22CL2:
Commonly applied in conventional boilers and pressure vessels, ideal for medium temperature and pressure conditions.
Used in petrochemical plants, heat exchangers, and similar equipment.
Manufacturing and Processing
SA387Gr91CL2:
Due to its high alloy content, it is more difficult to process and requires stricter heat treatment and welding procedures.
Careful control of heat treatment temperature is necessary to ensure desired material properties.
SA387Gr22CL2:
Easier to process, with relatively good weldability.
Heat treatment requirements are lower, though still important to maintain performance.
Conclusion
SA387Gr91CL2 and SA387Gr22CL2 each have their unique advantages and application ranges. Gr91CL2 is suitable for higher temperature and higher pressure environments, while Gr22CL2 is more appropriate for medium temperature and pressure applications. The choice of material should be based on specific working conditions and performance requirements.
FAQ
Q: What is SA 387 material?
A: A high quality chrome molybdenum alloy steel plate intended specifically for use in weldable carbon steel pressure vessels at elevated temperatures. Added molybdenum gives the material greater temperature tensile strength and the chromium provides improved corrosion resistance.
Q: What is SA387 grade 11 equivalent to?
A: 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.
Q: What is the difference between SA387 Grade 11 Class 1 and Class 2?
A: The difference between SA 387 Grade 11 Class 1 and Class 2 Plate lies in their mechanical properties. However, they both have the same chemical composition. The tensile strength and yield strength of class 2 material is higher than that of class 1, whereas the elongation for class 1 is higher compared to class 2.
Q: What is the temperature range for SA 387 GR 11?
A: 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.
Q: What is SA 387 GR 9 material?
A: SA 387 GR 9 is a chromium-molybdenum alloy steel widely used in high-temperature applications such as pressure vessels and power generation equipment and it provides excellent resistance to oxidation and creep, making it ideal for long-term service at elevated temperatures.
Q: What is the chemical composition of SA 387 GR 22?
A: 22 CL. 2 plate chemical composition includes Chromium (Cr) 2%, Molybdenum (Mo) 1%, Manganese (Mn) 0.5%, Silicon (Si) 0.5%, Phosphorus (P) 0.03%, Sulfur (S) 0.03%, and Carbon (C) 0.1%.
Q: What is the equivalent material of SA 387 GR 12?
A: Sa 387 Gr 12 Equivalent Material can be classified as Asme SA 387 for the USA, for the European Union, the equivalent grade to this material is EN 13CrMo4-5. In Germany and England, the equivalent grades are DIN 13CRM044 and BS 620B, respectively. Apart from this, the equivalent grade for France is AFNOR 36206 15CD2.
Q: What is a A387 Grade 5 equivalent to?
A: Other Designations. Other designations that are equivalent to AISI A387 grade 5-PVQ alloy steel include the following: ASME SA387 (5) ASTM A314 (502)
Q: What is SA 387 GR 5 material?
A: chrome molybdenum alloy steel plate
SA387 GR 5 CLASS 2
A high quality chrome molybdenum alloy steel plate intended specifically for use in weldable carbon steel pressure vessels at elevated temperatures. Added molybdenum gives the material greater temperature tensile strength and the chromium provides improved corrosion resistance.
Besides commonly used A387/SA387, we also offer more targeted steel plate types as shown in the table below: high-strength low-alloy plates for heavy engineering loads, wear-resistant plates to reduce equipment wear, weather-resistant plates for long-term outdoor use, and marine plates that meet shipbuilding requirements. You can always contact us for more information on any of the types that interest you.
Email: info@gneesteels.com
| Other steel plate | ||||
| Name | Material | Specification (mm) | Tons | Remark |
| Low Alloy | Q345A, Q345B, Q345C, Q345D, Q345E, Q390, Q420, Q460C, ST52-3, S355J2+N, SS400, SA302GrC, S275NL, 35CrMo | 6 - 350 | 5788.56 | Normalizing, tempered ,controlled rolling, hot rolling , Hot rolling,1st inspection, 2nd inspection, 3rd inspection |
| Pressure Vessel Plate | Q245R, Q345R, Q370R, 16MnDR, 09MnNiDR, 15CrMoR, 14Cr1MoR, 12Cr2Mo1R, SA516Gr60, SA516Gr70, SA516Gr485, SA285, SA387Gr11, SA387Gr12, SA387Gr22, P265,P295,P355GH,Q245R(R-HIC),Q345R(R-HIC) | 3 - 300 | 8650 | Normalizing, tempered ,controlled rolling, hot rolling , Hot rolling,1st inspection, 2nd inspection, 3rd inspection |
| High-Strength Plate | WH785D/E,Q960D/E, Q890D/E,WH60D/E,WH70B,Q550D,Q590D,Q690D/E | 8 - 120 | 3086.352 | Quenched and tempered |
| Wear-Resistant Plate | NM360, NM400, NM450, NM500 | 6 - 150 | 3866.297 | Quenched and tempered |
| Bridge Plate | Q235qC, Q345qC, Q370qC, Q420qC, Q345qDNH, Q370qDNH, A709 - 50F - 2, A709 - 50T - 2 | 8 - 200 | 2853.621 | Hot rolling, normalized ,hot rolling controlled rolling, quenched and tempered + toughness and brittleness |
