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SA387 GR.11 CL 1 Cr-Mo Alloy Pressure Vessel Steel Plate

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SA387 GR.11 CL 1 Alloy Pressure Vessel Steel Plate Descriptions: Chemical Composition and Mechanical Properties:
SA387 GR.11 CL 1 Alloy Pressure Vessel Steel Plate Descriptions:
ASME SA387 Gr 11 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 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, 12,22, 5, 9 and 91.
Chemical Composition and Mechanical Properties:
SA387 Gr.11 CL.1Chemical Composition
Grade The Element Max (%)
C Si Mn P S Cr Mo
SA387 Gr.11 Cl.1 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.1Mechanical Property
Thickness Yield Tensile Elongation
SA387 Gr.11 Cl.1 mm Min Mpa Mpa Min  %
t≦50 240 415-585 22
50<t≦200 240 415-585 19
 

Refered Standards for ASTM A387 Alloy Steel Plate

ASTM

  • A20/A20M: General requirements for pressure vessel plates.
  • A370: Test specification for mechanical properties of steel
  • A435/A435M: For straight-beam ultrasonic examination of steel plates
  • A577/A577M: For ultrasonic angle beam examination of steel plates
  • A578/A578M: For straight beam UT examination of rolled steel plates in special applications
  • A1017/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 A387 Chrom Moly Alloy Steel Plate 

Chrome moly alloy steel plate under ASTM A387 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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