ASTM A387 Grade 11 Class 1 is a specific type of chromium-molybdenum (Cr-Mo) alloy steel plate designed for welded boilers and pressure vessels used in high-temperature, high-pressure applications, common in the oil & gas, petrochemical, and power generation industries. This material offers excellent high-temperature strength, creep resistance, and oxidation resistance due to its alloying elements (around 1.25% Chromium and 0.5% Molybdenum).
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A387 Gr.11 CL.1Chemical Composition |
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Grade |
The Element Max (%) |
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C |
Si |
Mn |
P |
S |
Cr |
Mo |
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A387 Gr.11 Cl.1 |
0.04-0.17 |
0.44-0.86 |
0.35-0.73 |
0.035 |
0.035 |
0.94-1.56 |
0.40-0.70 |
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Grade |
A387 Gr.11 CL.1Mechanical Property |
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Thickness |
Yield |
Tensile |
Elongation |
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A387 Gr.11 Cl.1 |
mm |
Min Mpa |
Mpa |
Min % |
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t≦50 |
240 |
415-585 |
22 |
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50<t≦200 |
240 |
415-585 |
19 |
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Equivalent steel grade of A387 Gr.11 Cl.1 |
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Europe |
Belgium |
Germany |
France |
Italy |
Sweden |
India |
Japan |
U.K |
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621 gr. A,B |
Application Industries Of Alloy Steel ASTM A387 Grade 11 Class 1 Plate
Power Generation
Petrochemicals
Gas Processing
Specialty Chemicals
Pharmaceuticals
Chemical Equipment
Sea Water Equipment
Heat Exchangers
Condensers
Pulp and Paper Industry
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1.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.
2.What is A387 grade 11 material?
The ASTM A387 specification is the Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum intended primarily for use in welded boilers and pressure vessels designed for elevated temperature service. SSAB can supply A387 Grade 11 to the tension test requirements for Class 1 and/or Class 2.
3.What is the chemical composition of ASTM A387 Grade 11 Class 1?
ASTM A387 Grade 11 Class 1 is a chromium-molybdenum alloy steel with key elements including approximately 1.00-1.50% Chromium (Cr), 0.45-0.65% Molybdenum (Mo), and limited Carbon (C) (0.05-0.17%), designed for high-temperature pressure vessels, offering good creep, oxidation, and corrosion resistance. Other elements like Silicon (Si), Manganese (Mn), Phosphorus (P), and Sulfur (S) are also present within specified ranges.