ASME SA387 GR.11 CL2 Pressure Vessel Steel plate

Pressure vessel used alloy steel plate SA387 Grade 11 CL 1,SA387 Grade 11 CL 2,A387 Grade 11 CL 1 and A387 Grade 11 CL 2 are with Chromium-Molybdenum alloy elements.Pressure vessel steel plate SA387 Grade 11 CL 1 and SA387 Grade 11 CL 2 are in American standard ASME SA 387/SA 387M.Boiler steel plate A387 Grade 11 Cl 1 and A387 Grade 11 Cl 2 are according to ASTM A387/A387M.These steel materials also shall conform to steel specification A 20/A 20M.These requirements outline the testing and retesting methods and procedures,permissible variations in dimensions and weight,quality and repair of defects,marking,loading,etc.
 
In addition to the basic requirements of this specification for steel plate SA387 Grade 11 CL 1,SA387 Grade 11 CL 2,A387 Grade 11 CL 1 and A387 Grade 11 CL 2 ,certain supplementary requirements are available whenadditional control, testing, or examination is required to meetend use requirements. These include:1 Vacuum treatment,2 Additional or special tension testing,3 Impact testing, 4 Nondestructive examination

SA387 Gr.11 CL.2 Chemical Composition
Grade	The Element Max (%)
	C	Si	Mn	P	S	Cr	Mo
SA387 Gr.11 Cl.2	0.04-0.17	0.44-0.86	0.35-0.73	0.035	0.035	0.94-1.56	0.40-0.70

 

Grade	SA387 Gr.11 CL.2 Mechanical Property
	Thickness	Yield	Tensile	Elongation
SA387 Gr.11 Cl.2	mm	Min Mpa	Mpa	Min  %
	t≦50	310	515-690	18
	50<t≦200	-	-	-

Refered Standards for ASME SA387 Alloy Steel Plate

ASTM

• SA20/A20M: General requirements for pressure vessel plates.
• SA370: Test specification for mechanical properties of steel
• SA435/A435M: For straight-beam ultrasonic examination of steel plates
• SA577/A577M: For ultrasonic angle beam examination of steel plates
• SA578/A578M: For straight beam UT examination of rolled steel plates in special applications
• SA1017/A1017M: Specification for pressure vessle plates of alloy steel, chromium-molybdenum-tungsten

AWS Specification

• A5.5/A5.5M: Low alloy steel electrodes for shield metal arc welding.
• A5.23/A5.23M: Low alloy steel electrodes for fulxes for submerged arc welding.
• A5.28/A5.28M: For gas shielded arc welding
• A5.29/A5.29M: For flux cored arc welding.

Heat Treatment for SA387 Chrom Moly Alloy Steel Plate 

Chrome moly alloy steel plate under ASME SA387 shall be killed steel, with thermally treated either by annealing, normarlizing and tempering. Or in case agreed by buyer, accelerated cooling from the austenitizing temperature by air blasting or liquid quenching, followed by tempering, minimum tempering temperatures shall be as below table:

Grade	Temperature, °F [°C]
2, 12 and 11	1150 [620]
22, 22L, 21, 21L and 9	1250 [675]
5	1300 [705]