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P355nl1 Boiler Pressure Vessel Steel Plate Astm 285 C ASTM A387 Cr-Mo Alloy Steel

Place of Origin Jiangsu,China
Certification ISO 9001 ,CE
Minimum Order Quantity 1 PCS
Delivery Time 7~10 working days
Payment Terms L/C, T/T, Western Union
Supply Ability 5000 Ton/Tons per Month

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Product Details
Product Name Pressure Vessel Plates Delivery Conditon HR,CR,AR,Q+T,N+T,N,TMCP,UT,Z Direction
Thickness 6mm~200mm Width 2000mm/2200mm/2500mm
Length 9000mm~12000mm
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p355nl1 steel 1.0347


boiler steel plate 1.0347


p355nl1 pressure vessel steel plate 1.0347

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Product Description
ASTM A387 Cr-mo alloy steel pressure vessel plates 

ASTM A387 is the standard specification for pressure vessel plates, alloy steel, chromium-molybdenum. These Cr-Mo alloy steel plates are primarily manufactured for welded boilers and pressure vessels for elevated temperature service.



Type Grade Standard Application
Steel plates for boilers and pressure vessels




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 reactor pressure shells, boiler drums, liquefied petroleum gas cylinders, Equipment and components such as high-pressure water pipes and turbine volutes of hydropower stations.




Element C Mn P S Si Cr Mo
Grade 2 0.04~0.21 0.50~0.88 0.025 0.025 0.13~0.45 0.46~0.85 0.40~0.65
Grade 12 0.04~0.17 0.35~0.73 0.025 0.025 0.13~0.45 0.74~1.21 0.40~0.65
Grade 11 0.04~0.17 0.35~0.73 0.025 0.025 0.44~0.86 0.94~1.56 0.40~0.70
Grade 22 0.04~0.15 0.25~0.66 0.025 0.025 ≤0.05 1.88~2.62 0.85~1.15
Grade 22L ≤0.12 0.25~0.66 0.025 0.025 ≤0.05 1.88~2.62 0.85~1.15
Grade 21 0.04~0.15 0.25~0.66 0.025 0.025 ≤0.05 2.63~3.37 0.85~1.15
Grade 21L 0.12 0.25~0.66 0.025 0.025 ≤0.05 2.63~3.37 0.85~1.15
Grade 5 ≤0.15 0.25~0.66 0.025 0.025 ≤0.55 3.90~6.10 0.40~0.70
Grade 9 ≤0.15 0.25~0.66 0.025 0.025 ≤1.05 7.90~10.10 0.85~1.15
Grade 91 0.06~1.15 0.25~0.66 0.025 0.012 0.18~0.56 7.90~9.60 0.80~1.10




  • Except for Grade 91, all ASTM A387 plates shall be thermally treated either by annealing, normalizing and tempering, or, when permitted by the purchaser, accelerated cooling from the austenitizing temperature by air blasting or liquid quenching, followed by tempering. The minimum tempering temperatures for grades (2, 12 & 11), grades(22, 22L, 21, 21L & 9), grades 5 are respectively 1150°F[620°C], 1250°F[675°C], 1300°[705°C].
  • Grade 91 plates shall be thermally treated, either by normalizing and tempering or by accelerated cooling from the austenitizing temperature by air blasting or liquid quenching, followed by tempering. Grade 91 plates shall be austenitized at 1900 to 1975°F [1040 to 1080°C] and shall be tempered at 1350 to 1470°F [730 to 800°C].



The inspection and tests that shall be alternately performed on ASTM A387 alloy steel plates include: tension test, Charpy V-Notch impact test, drop weight test, high-temperature tension test, ultrasonic examination, magnetic particles examination.