SA 387 Gr.22 Cl.1 refers to a chromium-molybdenum alloy steel plate compliant with the ASTM A387/ASME SA-387 standard, specifically engineered for welded pressure vessels operating under high-temperature conditions. Its formulation centers on chromium and molybdenum as core alloying elements, which endow the steel plate with balanced mechanical strength and robust corrosion resistance. This grade also boasts excellent weldability and high-temperature creep resistance, making it a reliable choice for critical industrial applications that demand long-term structural integrity and stable performance under harsh thermal and corrosive environments.
Chemical Requirements for ASME SA387 Grade 22 Alloy Steel Plates
| Element | Chemical Composition (%) | |
| SA387 Grade 22 | ||
| Carbon: | Heat Analysis: | 0.05 - 0.15 |
| Product Analysis: | 0.04 - 0.15 | |
| Manganese: | Heat Analysis: | 0.30 - 0.60 |
| Product Analysis: | 0.25 - 0.66 | |
| Phosphorus: | Heat Analysis: | 0.035 |
| Product Analysis: | 0.035 | |
| Sulphur (max): | Heat Analysis: | 0.035 |
| Product Analysis: | 0.035 | |
| Silicon: | Heat Analysis: | 0.50 max |
| Product Analysis: | 0.50 max | |
| Chromium: | Heat Analysis: | 2.00 - 2.50 |
| Product Analysis: | 1.88 - 2.62 | |
| Molybdenum: | Heat Analysis: | 0.90 - 1.10 |
| Product Analysis: |
0.85 - 1.15 |
Key Applications
Pressure VesselsIt serves as a core material for fabricating welded boilers and pressure vessels dedicated to elevated-temperature service, delivering exceptional structural integrity and creep resistance to withstand prolonged exposure to high heat and pressure in critical industrial systems.
Heat ExchangersIt is widely adopted in the manufacturing of heat exchanger components involved in high-temperature heat transfer processes, effectively resisting thermal fatigue and media corrosion to ensure efficient and stable heat exchange performance.
Piping & TubingIt is an ideal choice for high-temperature fluid and gas transport piping and tubing systems, capable of enduring the harsh conditions of high-temperature media transmission while maintaining reliable sealing and structural stability.
Industrial EquipmentIt is extensively used to build key equipment in refineries, chemical plants, and power plants that handle hot gases and liquids, providing robust resistance to high-temperature oxidation and corrosive media erosion for long-term operational reliability.
Ducting & FlangesIt is also applied to produce high-temperature industrial ducting, heavy-duty pipe clamps, and pressure-bearing flanges, meeting the strict requirements of high-temperature working environments for dimensional stability and connection tightness.
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1.What is SA 387 GR 22 material?
The SA 387 Grade 22 Steel is a pressure vessel steel made up of high-quality raw material and high technology. Commonly used for high-temperature tasks based on its high heat tolerance this steel plate can be exposed up to 600° while maintaining superb oxidation and corrosion resistance.
2.What is the difference between SA 387 Grade 11 CL 1 and Class 2?
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.