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.
GRADE
Type | Grade | Standard | Application |
Steel plates for boilers and pressure vessels |
Q245R/20g,Q345R (S)A299M |
ASTM,ASME,DIN,JIS,GB |
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. |
CHEMICAL COMPOSITION-ASTM A387 Alloy Steel Plates,%
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 |
HEAT TREATMENT :
INSPECTION AND TEST:
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.