ASTM A387 Plates

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.

Champak Industries 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, and Chromium-Molybdenum.

Chrome Moly Plate
ASME SA / ASTM A387 Gr 11 Cl. 2, ASME SA / ASTM A387 Gr 22 Cl. 2, ASME SA / ASTM A387 Gr 5 Cl. 2, ASME SA / ASTM A387 Gr 9 Cl. 2.

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, 91 and 9 and in most case stock plates will be produced to the tensile requirements of Class 2.

As with all ASME and ASTM pressure vessel steels, Chrome Moly to SA387 and A387 is produced in conformity to SA20 / A20 which outlines the testing and retesting methods and procedures, permissible variations in dimensions and weight, quality and repair of defects, marking, loading, and ordering information.

GRADE	NOMINAL 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

Chemical Requirements

	GR. 2	GR. 12	GR. 11	GR. 22	GR. 22L	GR. 21	GR. 21L	GR. 5	GR. 9	GR. 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 For Class 1 Plates

GRADE	TENSILE (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

Tensile Requirements For Class 2 Plates

GRADE	TENSILE (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	-

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ASTM A387 Plates

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