ASME SA387 Grade 12 Class 1 is a chromium-molybdenum alloy steel plate designed for use in pressurevessels and boilers working in elevated temperatures, This material combines the corrosion resistance of chromiumwith the high strength and heat resistance of molybdenum. It belongs to the family of alloy steels specified under theASME SA387 and ASTM A387 standards.
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SA387 Gr.12 CL.1 Chemical Composition |
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Grade |
The Element Max (%) |
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C |
Si |
Mn |
P |
S |
Cr |
Mo |
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SA387 Gr.12 Cl.1 |
0.04-0.17 |
0.13-0.45 |
0.35-0.73 |
0.035 |
0.035 |
0.74-1.21 |
0.40-0.65 |
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Grade |
SA387 Gr.12 CL.1Mechanical Property |
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Thickness |
Yield |
Tensile |
Elongation |
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SA387 Gr.12 Cl.1 |
mm |
Min Mpa |
Mpa |
Min % |
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t≦50 |
230 |
380-550 |
22 |
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50<t≦200 |
- |
- |
18 |
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Equivalent steel grade of SA387 Gr.12 Cl.1 |
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Europe |
Belgium |
Germany |
France |
Italy |
Sweden |
India |
Japan |
U.K |
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621 gr. A,B |
Applications
Boiler Components: Key parts like boiler drums and headers that endure long-term thermal cycling and pressure.
Pressure Vessels: Pressure-bearing vessels for storing and transporting high-temperature and high-pressure media.
Heat Exchangers: Core components for efficient heat transfer in chemical and oil refining processes.
Oil Refineries: Critical equipment adapting to the harsh high-temperature, high-pressure refining environment.
Gas Processing Units: Equipment for natural gas purification, dehydration and separation.
Chemical Reactors: Vessels for conducting high-temperature and high-pressure chemical reactions.
Thermal Power Plants: Major components supporting stable operation of thermal power generation systems.
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1.What is SA 387 Grade 12 CL 1 material?
SA 387 Grade 12 Class 1 is a chromium-molybdenum (Cr-Mo) alloy steel plate, specified by ASME (American Society of Mechanical Engineers) for use in welded boilers, pressure vessels, and other equipment designed for elevated temperature service, offering good corrosion resistance, especially in oil and gas applications. The "Grade 12" indicates its specific Cr/Mo content (around 1% Cr, 0.5% Mo), while "Class 1" signifies lower tensile strength and yield strength compared to Class 2, with specific mechanical properties like a yield strength of 230 MPa (33 ksi).
2.What is the difference between Class 1 and Class 2 steel?
Class 1 is normalized, with a tensile strength of 70-90 ksi and a minimum yield of 50 ksi. Class 2 has a tensile strength of 80-100 ksi and minimum yield strength of 60 ksi.