ASTM A387 Grade 22 High Strength Chromium Molybdenum Steel Plate for High

ASTM A387 Grade 22 is a specification for pressure vessel plates made of chromium-molybdenum alloy steel, engineered to excel in elevated temperature service conditions. This grade is one of the higher-strength options within the ASTM A387 specification, combining robust mechanical properties with exceptional corrosion and oxidation resistance—key attributes for withstanding the harsh conditions of oil, gas, petrochemical, and power generation applications. Available in two classes (Class 1 and Class 2), this steel plate caters to diverse project needs, with Class 1 supplied in the normalized and tempered condition and Class 2 in the quenched and tempered condition, enhanced by vanadium to boost toughness and high-temperature strength.

Our ASTM A387 Grade 22 steel plate adheres strictly to ASTM standards and ISO certification, ensuring consistent quality and reliability. With a thickness range of 3-20mm (0.185-3.60 inches), it is supplied in strip packaging, ready for immediate delivery. Whether for boiler manufacturing, pressure vessel fabrication, or other high-temperature equipment, this alloy steel plate delivers the durability and performance required for long-term, safe operation.

Notes: 1) Refer to ASTM A20/A20M for Elongation adjustments based on plate thickness. 2) Reduction of Area is measured on a flat specimen.

ASTM A387 Grade 22 steel plate consists of key alloy elements that contribute to its exceptional performance, including carbon (C), manganese (Mn), phosphorus (P), sulfur (S), silicon (Si), chromium (Cr), and molybdenum (Mo). Class 2 plates additionally contain vanadium (V), which enhances toughness and high-temperature strength. The precise composition is strictly controlled to meet ASTM standards, ensuring consistent quality and performance across all batches.

ASTM A387 Grade 22 steel plate is engineered for high-temperature and high-pressure applications, making it indispensable in the following industries and scenarios:

• Oil & Gas Industry: Ideal for pressure vessels, pipelines, and equipment used in oil extraction, refining, and natural gas processing, where resistance to corrosion and high temperatures is critical. It performs exceptionally well in sour service environments, resisting hydrogen-induced damage and sulfide corrosion.
• Petrochemical Industry: Used in the fabrication of reactors, heat exchangers, and storage tanks for chemical processing, capable of withstanding harsh corrosive media and elevated temperatures.
• Power Generation Industry: Suitable for welded boilers, boiler drums, and high-temperature steam pipelines in thermal power plants, where long-term operation under high pressure and temperature is required.
• Other High-Temperature Applications: Applied in nuclear power auxiliary systems, marine engineering pressure equipment, and industrial boilers, where reliability and durability are non-negotiable.

ASTM A387 Grade 22’s performance is rooted in its carefully formulated chromium-molybdenum alloy composition and precise heat treatment process. Chromium enhances oxidation and corrosion resistance, forming a protective oxide layer on the surface to prevent degradation in harsh environments. Molybdenum improves high-temperature strength and creep resistance, allowing the steel plate to maintain structural integrity even when exposed to long-term stress at elevated temperatures (up to approximately 600°C).

The two classes of ASTM A387 Grade 22 are tailored to different fabrication needs: Class 1 (normalized and tempered) is designed for applications where the final vessel will undergo full post-weld heat treatment (PWHT), while Class 2 (quenched and tempered with vanadium) delivers higher pre-tempered strength for vessels that cannot be fully heat-treated after fabrication. This flexibility ensures the material can adapt to diverse project requirements while maintaining optimal performance.

ASTM A387 Grade 22 is a chromium-molybdenum alloy steel plate primarily used for welded boilers and pressure vessels in elevated temperature and high-pressure applications. It is widely used in the oil, gas, petrochemical, and power generation industries, as well as other sectors requiring corrosion and high-temperature resistance.

The key differences lie in their heat treatment and composition: Class 1 is supplied in the normalized and tempered condition, while Class 2 is quenched and tempered and contains vanadium. Class 2 offers higher minimum tensile strength (85 ksi vs. 75 ksi for Class 1) and yield strength (55 ksi vs. 45 ksi for Class 1), as well as improved toughness and high-temperature strength.

Yes, we maintain a large inventory of ASTM A387 Grade 22 steel plate, with a thickness range of 3-20mm. It is ready for immediate delivery to meet your project timelines.

Our ASTM A387 Grade 22 steel plate strictly complies with the ASTM standard (ASTM A387) and is ISO certified, ensuring it meets the highest quality and safety requirements for pressure vessel applications.

Yes, while our standard width range is 60-131.9 inches and length range is 73-590 inches, we can supply custom widths and lengths upon request. Please contact us for detailed inquiries about custom specifications.

As a professional manufacturer, our annual production capacity for ASTM A387 Grade 22 steel plate is 100,000 tons, ensuring we can meet large-volume orders efficiently.

We use strip packaging for ASTM A387 Grade 22 steel plate to ensure safe transportation and prevent damage during transit. Custom packaging options are available upon request.