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Chrome Moly Plate ASME SA387 and ASTM A387
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Both SA387 and A387 are described as a "Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum". The specification covers alloy steel plates intended primarily for welded boilers and pressure vessels designed for elevated temperature use.
Plates are available under these specifications in several grades each having different nominal Chromium (Cr) and Molybdenum (Mo) contents as follows:
| Grade | Nominal Cr Content (%) | Nominal Mo Content (%) | ||
| 2 | 0.5 | 0.5 | ||
| 12 | 1 | 0.5 | ||
| 11 | 1.25 | 0.5 | ||
| 22, 22L | 2.25 | 1 | ||
| 21, 21L | 3 | 1 | ||
| 5 | 5 | 0.5 | ||
| 9, 91 | 9 | 1 | ||
Each grade except Grades 21L, 22L, and 91 is available in two classes of tensile strength described as Class 1 and Class 2.
The most regularly specified grades and hence those that are most readily available from stock are Grades 12, 11, 22, 5, and 9 and in most case stock plates will be produced to the tensile requirements of Class 2.
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