ASME SA387 is a chromium molybdenum alloy steel plate intended primarily for welded boiler and pressure vessels designed of elevated temperature service. The Cr content 1.25% and the Mo content 0.5%. Chrome moly plate under ASME SA387 in serveral grades that has different alloy contents as below, common use grades are Gr 11, 12,21,22, 5, 9 and 91.

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SA387 GR.21 CL1 Pressure vessel steel plate Descriptions:

ASTM A387 Gr 21 CL 1 is a chromium molybdenum alloy steel plate intended primarily for welded boiler and pressure vessels designed of elevated temperature service. The Cr content 3.00 % and the Mo content 1.00 %. Each grade except grade 21L, Grade 22L, Grade 91 and Grade 911 is available in two classes of tensile strength levels.ASTM A387 GRADE 5 Class 1 - Alloy steelASTM A387 GRADE 5 Class 1 A high quality ASTM A387 GRADE 5 Class 1 or chrome molybdenum alloy steel plate intended specifically for use in weldable carbon steel pressure vessels at elevated temperatures. Added molybdenum gives the material greater temperature tensile strength and the chromium provides improved corrosion resistance.ASTM A387 Grade 11 Class 1 steel plates for pressure somalia a387 grade 5 class1ASTM A387 Grade 11 Class 1 is in the standard ASTMA-387 SA-387M .A387 Grade 11Class 1 is a kind of Cr-Mo-alloy steel plates material used to fabric high temperature pressure vessels.A387 have ten grades or levels. They are grade 2 , grade 12 , grade 11 , grade 22 , grade 22L , grade 21 , grade 21L , grade 5 , grade 9 , grade 91.

Chemical Composition and Mechanical Properties:

SA387 Gr.21L CL.1 Chemical Composition
Grade	The Element Max (%)
Grade	C	Si	Mn	P	S	Cr	Mo
SA387 Gr.21L Cl.1	0.12	0.50	0.25-0.66	0.035	0.035	2.63-3.37	0.85-1.15

Grade	SA387 Gr.21L CL.1 Mechanical Property
Grade	Thickness	Yield	Tensile	Elongation
SA387 Gr.21L Cl.1	mm	Min Mpa	Mpa	Min %
	t≦50	205	415-585	18
	50<t≦200	-	-	-

Refered Standards for ASME SA387 Alloy Steel Plate

ASME

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]

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Shandong Chengshun Metal Materials Co., Ltd. is located in Jinan City, Shandong Province. It is a comprehensive company dealing in high-quality steel products, with a superior geographical location and very convenient transportation. The company has a complete and scientific quality system, and has been recognized by the industry for its integrity, strength and product quality.

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Boiler Pressure Vessel Steel