Both A387 Grade 11 Class 1 (A387 Gr.11 Cl.1) and A387 Grade 11 Class 2 (A387 Gr.11 Cl.2) are pressure vessel plates made of Carbon alloy steel.
A387 Grade 11 Class 1
A387 Grade 11 Class 1 is a type of chromium-molybdenum alloy steel plate primarily intended for use in welded boilers and pressure vessels designed for elevated temperature service.
Chemical Composition (%) of A387 Gr.11 Stee
A387 Gr.11 Cl.1 and A387 Gr.11 Cl.2 have identical chemical composition requirements. The details are as follows:
| A387 Gr.11 | Carbon | Manganese | Phosphorus | Sulfur | Silicon | Chromium | Molybdenum |
|---|---|---|---|---|---|---|---|
| Heat Analysis (Max %) | 0.05-0.17 | 0.4-0.65 | 0.025 | 0.025 | 0.50-0.80 | 1.00-1.50 | 0.45-0.65 |
Mechanical Properties of A387 Gr.11 Plates
For A387 Gr.11 Cl.2, the "Class" designation indicates two different tensile strength levels. A387 Gr.11 Cl.1 and Cl.2 have different tensile property requirements. The detailed mechanical properties highlighting the differences are:
| A387 Gr.11 | Tensile Strength ksi (MPa) | Yield Strength ksi (MPa) | Elongation (Min, %) | |
|---|---|---|---|---|
| in 200mm | in 50mm | |||
| Cl.2 | 75-100 (515-690) | 45 (310) | 18 | 22 |
| Cl.1 | 60-85 (415-585) | 35 (240) | 19 | 22 |
Heat Treatment of A387 Gr.11 Steel
A387 Gr.11 alloy steel plates shall be thermally treated by either annealing, normalizing and tempering, or-when permitted by the purchaser-by accelerated cooling from the austenitizing temperature via air blasting or liquid quenching, followed by tempering. The minimum tempering temperature shall be 1150°F (620°C).
Applications of A387 Gr.11 Alloy Steel Plates
A387 Gr.11 Cl.2 steel is also a type of heat-resistant steel. It is commonly used in the petroleum and petrochemical industries, chemical equipment manufacturing, power station construction, and boiler and pressure vessel manufacturing.
Under the ASTM A387 specification, other grades include A387 Grade 5 Class 1, Grade 5 Class 2, Grade 9, Grade 12 Class 1, Grade 12 Class 2, Grade 22 Class 1, Grade 22 Class 2, and Grade 91. These grades have similar applications to A387 Gr.11 steel.
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What is ASTM A387 material?
ASTM A387 GR. 91 CL. 2 Alloy Steel Plates manufactured at the world's finest steel mills, this molybdenum-chrome based alloy has excellent resistance to greater working temperatures, making it the right selection for various applications like in gas, oil, chemical, and power generation.
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.
What is the difference between ASTM A182 and A387?
A387 is Plate material. A182 is Forging material. You can refer relevant ASTM Book of standards.
What is ASTM A387?
The ASTM A387 specification is the Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum plates used in the application of welded boilers and pressure vessels subjected to elevated temperatures. The two grades SSAB produces are available as Class 1 and/or Class 2.