ASME SA387 and ASTM A387 Chrome Moly Plate

  • Asme

Most commonly used steel specifications for Chrome Moly plate are ASME SA387 and ASTM A387

  • Chemical and mechanical properties of the ASME and ASTM specifications are the same.
  • Brown McFarlane supplies Chrome Moly plates to ASME SA387 and ASTM A387 both from stock and, where required by the customer, cut to size and shape.
  • SA387 and A387 are described as a "Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum.

Properties

GradeNominal Cr Content (%)Nominal Mo Content (%)
2 0.50 0.50
12 1.00 0.50
11 1.25 0.50
22, 22L 2.25 1.00
21, 21L 3.00 1.00
5 5.00 0.50
9, 91 9.00 1.00

Requirements

Chemical Requirements

 Gr. 2Gr. 12Gr. 11Gr. 22Gr. 22LGr. 21Gr. 21LGr. 5Gr. 9Gr. 91*
C 0.05-0.21 0.05-0.17 0.05-0.17 0.05-0.15 0.10 0.05-0.15 0.10 0.15 0.15 0.08-0.12
Mn 0.55-0.80 0.40-0.65 0.40-0.65 0.30-0.60 0.30-0.60 0.30-0.60 0.30-0.60 0.30-0.60 0.30-0.60 0.30-0.60
P 0.025 0.025 0.025 0.025 0.025 0.025 0.025 0.025 0.025 0.020
S 0.025 0.025 0.025 0.025 0.025 0.025 0.025 0.025 0.025 0.010
Si 0.15-0.40 0.15-0.40 0.50-0.80 0.50 0.50 0.50 0.50 0.50 1.00 0.20-0.50
Cr 0.50-0.80 0.80-1.15 1.00-1.50 2.00-2.50 2.00-2.50 2.75-3.25 2.75-3.25 4.00-6.00 8.00-10.00 8.00-9.50
Mo 0.45-0.60 0.45-0.60 0.45-0.65 0.90-1.10 0.90-1.10 0.90-1.10 0.90-1.10 0.45-0.65 0.90-1.10 0.85-1.05
V - - - - - - - - 0.04 0.18-0.25

Tensile Requirements

Class 1 Plates
GradeTensile (MPa)Yield (MPa)Elong. (50mm)Reduc'n of Area*
2, 12 380 - 550 230 min 22% min -
11 415 - 585 240 min 22% min -
22, 21, 5, 9 415 - 585 205 min 18% min 40% min
21L, 22L 415 - 585 205 min 18% min 40% min
Class 2 Plates
GradeTensile (MPa)Yield (MPa)Elong. (50 mm)Reduc'n of Area*
2 485 - 620 310 min 22% min -
11 515 - 690 310 min 22% min -
12 450 - 585 275 min 22% min -
22, 21, 5, 9 515 - 690 310 min 18% min 40% min
91 585 - 760 415 min 18% min -