ASTM A387 Grade 9 Class Steel Plates are known for their excellent resistance to high temperatures, strong mechanical properties, and long service life. They have become a preferred material for industries that operates under extreme heat and pressure, so selecting the right material is essential for safety and long-term performance. They are the best choice for many engineers.
What Is ASTM A387 Grade 9 Class 2 Steel Plate?
Grade 9 Class 2 Steel Plate is an alloy steel plate which is a result of two mixtures i.e., chromium and molybdenum under Chrome Moly Plates series. It contains approximately 9% chromium and 1% molybdenum, which gives them excellent heat resistance, superior strength, oxidation protection.
The Class 2 designation indicates a higher strength level achieved through heat treatment, making the plate suitable for more severe pressure and temperature conditions than Class 1. These properties make Grade 9 Class 2 an excellent choice for critical industrial equipment that must operate safely over long periods.
Why choose ASTM A387 Grade 9 Class 2 Steel Plate?
Choosing Alloy Steel ASTM A387 Grade 9 Class 2 Steel Plate comes up with several key features. The key features are:
• Excellent resistance to high temperatures and thermal fatigue
• High strength and improved creep resistance due to Class 2 heat treatment
• Strong protection against oxidation and scaling
• Good weldability and ease of fabrication
• Long service life with reduced maintenance requirements
• Reliable performance in harsh industrial environments
Applications of ASTM A387 Grade 9 Class 2 Steel Plate
They are suitable for the equipment that are exposed to continuous high-temperature service and corrosive operating conditions.
• Pressure vessels and boilers
• Petrochemical and refinery equipment
• Heat exchangers and reactors
• Power generation plants
• Chemical processing units
• Industrial furnaces and heaters
ASTM A387 Grade 9 Class 2 Steel Plate Grade:
ASTM A387 Grade 5 Class 2, Grade 9 Class 2, Grade 11 Class 2, Grade 12 Class 2, Grade 22 Class 2, Grade 91 Class 2.
ASME SA387 Grade 5 Class 2, Grade 9 Class 2, Grade 11 Class 2, Grade 12 Class 2, Grade 22 Class 2, Grade 91 Class 2.
EN 10028:16Mo3,13CrMo45,10CrMo910
BS 1501:620B, 621B,622B
Specifications of ASTM A387 Grade 9 Class 2 Steel Plate:
Chromium & Molybdenum content
Designation Nominal Chromium
Content (%) Nominal Molybdenum
Content (%)
SA387 Grade 9 9% 1%
Chemical Properties of ASTM 387 Grade 9 Class 2 Steel Plate:
Element Chemical Composition (%)
SA 387 Grade 9
Carbon: Heat Analysis: 0.15 max
Product Analysis: 0.15 max
Manganese: Heat Analysis: 0.30 – 0.60
Product Analysis: 0.25 – 0.66
Phosphorus: Heat Analysis: 0.030
Product Analysis: 0.030
Sulphur (max): Heat Analysis: 0.030
Product Analysis: 0.030
Silicon: Heat Analysis: 1.00 max
Product Analysis: 1.05 max
Chromium: Heat Analysis: 8.00 – 10.00
Product Analysis: 7.90 – 10.10
Molybdenum: Heat Analysis: 0.90 – 1.10
Product Analysis: 0.85 – 1.15
Vanadium: Heat Analysis: 0.04 max
Product Analysis: 0.05 max
Mechanical Properties of ASTM 387 Grade 9 Class 2 Steel Plate:
Designation: Requirement: Grade 9
SA 387 Grade 9 Tensile strength, ksi [MPA] 75 to 100 [515 to 690]
Yield strength, min, ksi [MPa] / (0.2% offset) 45 [310]
Elongation in 8 in. [200mm], min % –
Elongation in 2 in. [50mm], min, % 18
Reduction of area, min % 45 (measured on round specimen) 40 (measured on flat specimen)
Conclusion: For high-temperature and high-pressure applications, ASTM A387 Grade 9 Class 2 steel plates have proven to be a reliable material. Their remarkable strength, heat resistance, and long-term dependability are provided by their chromium-molybdenum composition. Grade 9 Class 2 steel plates continue to be a reliable option that promotes effective operations and a long service life for industries that require reliable performance, safety, and durability.
ASTM A387 Grade 9 Class 2 Steel Plates: A Trusted Choice for High-Temperature Applications