1. Simple Description: 1) ASTM Standard A387/A387M-11 Chromium-Molybdenum Alloy Steel Sheets for Pressure Vessels Chemical Composition Impact Temperature Delivery Condition Normalized + Tempered/Annealed. 2) Each grade excepi Grades 21L 22L and 9 is available intolasses of tensile srength levels as defined in the Tensile Requirements tables. Grades 21L and 22L are available only as Class 1 Grade 91 is available only as Class 2. NOTE 1- Grade 911, previously covered by this specification, is now covered by Specification A1017/A1017M. 3) The maximum thickness of plates is limited only by the capacity of the composition to meet the specified mechanical property requirements. 2. Chemical Composition:

Grade	Analysis	Chemical  Composition (Max %)
		C	Si	Mn	P	S	Cr	Mo
Gr11	Heat	0.05-0.17	0.5-0.8	0.4-0.65	0.025	0.025	1.0-1.5	0.45-0.65
	Product	0.04-0.17	0.44-0.86	0.35-0.73	0.025	0.025	0.94-1.56	0.40-0.70
Gr22	Heat	0.05-0.15	≤0.50	0.3-0.6	0.025	0.025	2.0-2.5	0.9-1.1
	Product	0.05-0.15	≤0.50	0.35-0.73	0.025	0.025	1.88-2.62	0.85-1.15

3. Mechanical Properties:

Grade	Class	Mechanical Property
		Yield Strength (N/mm2)/(Mpa)	Tensile Strength (N/mm2)/(Mpa)	Elongtation (%)
Gr11	Class 1	≥240	415-585	≥19
	Class 2	≥310	515-690	≥18
Gr22	Class 1	≥205	415-585	≥18
	Class 2	≥310	515-690	≥18

4. Picture Show: 5. Delivery: 6. Container Loading: 7. Application: The main purpose of American standard container plate: widely used in petroleum, chemical, power station, boiler and other industries, used to make reactors, heat exchangers, separators, spherical tanks, oil and gas tanks, liquefied gas tanks, nuclear energy reactor pressure shells, boilers Steam drums, liquefied petroleum gas cylinders, high-pressure water pipes of hydropower stations, turbine volutes and other equipment and components.