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SA387 Gr11 / Gr22 / Gr91

The chrome moly plates are generally available in two specifications ASME SA387 and ASTM A387. The chemical and mechanical properties for ASME and ASTM plates are same and are described as "Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum"

SA 387 Grade Plate

SA 387 Grade Plate

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The chrome moly plates are generally available in two specifications ASME SA387 and ASTM A387. The chemical and mechanical properties for ASME and ASTM plates are same and are described as "Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum" 

Application

  • These plates are commonly used in the high temperature conditions for welded boilers and pressure vessels


Plates are available under these specifications in several grades each having different nominal Chromium (Cr) and Molybdenum (Mo) contents as follows :

GradeNominal Cr Content (%)Nominal Mo Content (%)
20.50.5
1210.5
111.250.5
22, 22L2.251
21, 21L31
550.5
9, 9191


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. 

The following tables give information on the chemical and mechanical properties of all of the grades :

Chemical Requirements

(cast analysis, % by mass, maximum permitted unless indicated otherwise)


Gr. 2Gr. 12Gr. 11Gr. 22Gr. 22LGr. 21Gr. 21LGr. 5 Gr. 9Gr. 91*
C0.05-0.210.05-0.170.05-0.170.05-0.150.10.05-0.15 0.10  0.15 0.150.08-0.12 
Mn0.55-0.800.40-0.65 0.40-0.650.30-0.60 0.30-0.60 0.30-0.60 0.30-0.60 0.30-0.60 0.30-0.60 0.30-0.60 
P0.0250.025 0.0250.0250.025 0.025 0.025 0.025 0.025 0.020 
S0.0250.025 0.025 0.025 0.025 0.025 0.025 0.025 0.025 0.010 
Si0.15-0.400.15-0.40 0.50-0.800.50.50 0.50.50.51.00 0.20-0.50 
Cr0.50-0.800.80-1.15 1.00-1.50 2.00-2.502.00-2.502.75-3.252.75-3.254.00-6.008.00-10.00 8.00-9.50
Mo0.45-0.600.45-0.60 0.45-0.650.90-1.10 0.90-1.100.90-1.100.90-1.100.45-0.650.90-1.100.85-1.05 
V - - -- - - --0.04 0.18-0.25



Tensile Requirements


Class 1 Plates锟�

GradeTensile (MPa)Yield (MPa)Elong. (50mm)Reduc'n of Area*
2, 12380 - 550230 min22% min-
11415 - 585240 min22% min-
22, 21, 5, 9415 - 585205 min18% min40% min
21L, 22L 415 - 585205 min18% min40% min


Class 2 Plates

GradeTensile (MPa)Yield (MPa)Elong. (50 mm)Reduc'n of Area*
 2485 - 620310 min22% min-
11515 - 690310 min22% min -
12450 - 585275 min22% min-
22, 21, 5, 9515 - 690310 min18% min40% min
91585 - 760415 min18% min-


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