ASTM A387 Grade 22 Class 1 Pressure Vessel Steel Plates

ASTM A387 Grade 22 Class 1 Pressure Vessel Steel Plates

ASTM A387 Grade 22 Class 1 is a chromium-molybdenum (Cr-Mo) alloy steel plate for high-temperature, high-pressure applications like boilers and pressure vessels, featuring 2.25% Chromium and 1.00% Molybdenum, providing strength and corrosion resistance; Class 1 indicates a lower tensile strength range (e.g., 75-100 ksi or 515-690 MPa) compared to Class 2.

The distinct properties of ASTM A387 alloy steel plates are fundamentally dictated by the composition of elements introduced during the manufacturing process. The intricate balance of these elements ensures that the alloy aligns with desired grade specifications and dictates the resultant properties of the final product.

Each added element contributes to specific attributes, which determines the application scope of the material:

Chromium (Cr): A pivotal element in the production of alloy steel. In ASTM A387 Grade 22 Class 1, the chromium content is 2.25%. A higher concentration of chromium significantly bolsters the alloy's resistance against corrosion and oxidation.

Molybdenum (Mo): Introduced at a content of 1.00% for Grade 22, it imparts unique characteristics necessary for performance under stress.

Consequently, alloy grades such as 11, 12, 22, and others exhibit distinct properties tailored to specific needs. ASTM A387 Gr 22 CL 1 is specifically intended for use in welded boilers and pressure vessels designed for elevated temperature service. This diversity underscores the critical role these plates play across industries, where their strategic employment is delineated by their ability to maintain structural integrity in challenging environments.

Production Size: Thickness: 4mm- 400mm; Width: 1000mm- 4000mm; Length: 4000mm- 12000mm.

Production ability:10000 Tons Per Month.

Production Way: Hot Rolled, Annealing, Normalizing, Tempering.

Technical Details:

Heat Treatment: Normalized, Quenched, Tempered, HIC, Impact Test,..( Optional if not provided in rules)

Key Characteristics:

Material Type: Alloy Steel.

Standard: ASTM A387/A387M.

Key Elements: Contains ~2.25% Chromium (Cr) and ~1.00% Molybdenum (Mo).

Performance: Offers good resistance to oxidation and corrosion, with enhanced tensile strength at elevated temperatures due to the molybdenum content.

Applications: Primarily for high-temperature boilers, pressure vessels, heat exchangers, and equipment in the petrochemical and oil/gas industries.

Class 1: Denotes a specific tensile strength range, with Class 2 having a higher strength level.

Which Ultrasonic Testing (UT) standard will be applied to ASTM A387 Grade 22 Class1?

For ASTM A387 Grade 22 Class 1 (Cr-Mo alloy steel plates for pressure vessels), you'll likely use ASTM A435/A435M for basic straight-beam UT, ASTM A577/A577M for angle-beam UT, or ASTM A578/A578M for special straight-beam applications, but the specific standard depends on the project's requirements, often referencing ASME codes like B31.1 for piping or Section VIII for vessels.

What is the testing standard for ASTM A387 Grade 22 Class1?

ASTM A387 Grade 22 Class 1 testing standards involve tensile tests, requiring specific tensile strength (60-85 ksi), yield strength (min 30 ksi), and elongation (min 18% in 2") and reduction of area (min 40%). Key tests also include chemical analysis, hardness, flattening, and bending, ensuring the chromium-molybdenum alloy meets requirements for high-temperature pressure vessels, with specific heat treatment (tempering) also mandatory.

How does ASTM A387 Grade 22 Class 1 differ from ASTM A387 Grade 11 Class 1 ?

ASTM A387 Grade 22 Class 1 has significantly higher chromium (Cr) and molybdenum (Mo) content (around 2.25% Cr, 1% Mo) than Grade 11 Class 1 (around 1.25% Cr, 0.5% Mo), providing Grade 22 with superior high-temperature strength, creep resistance, and corrosion resistance, making it suitable for more severe conditions in power plants and chemical processing compared to Grade 11's moderate applications like boilers. Both are chromium-molybdenum alloy steels for elevated temperatures, but Grade 22 is the stronger, more robust choice for demanding environments

Equivalents for ASTM A387 Grade 22 Alloy Steel Plates

Specifications for ASTM A387 Grade 22 Alloy Steel Plates

Chromium & Molybdenum content (according to the ASME specification)

Tensile Requirements for ASTM A387 Grade 22 Alloy Steel Plates Class 1 Plates

Chemical Requirements for ASTM A387 Grade 22 Alloy Steel Plates

1What is ASTM A387 Grade 22 Class 1 material?

ASTM A387 Grade 22 Class 1 is a chromium-molybdenum (Cr-Mo) alloy steel plate, part of the ASTM A387 standard, designed for high-temperature applications in welded boilers and pressure vessels, offering good oxidation and corrosion resistance, especially in the oil, gas, and petrochemical industries, with its Class 1 designation indicating a specific tensile strength level within the grade. It contains approximately 2.25% Chromium and 1.00% Molybdenum, providing enhanced strength at elevated temperatures.

2What is ASTM A387 Grade 22 Class1 equivalent to ?

ASTM A387 Grade 22 Class equivalents include ASME SA387 Grade 22 Class 2, BS 622-515B, EN 10 CrMo9-10, and DIN 10 CrMo9-10, all representing a chromium-molybdenum alloy steel for elevated temperature service. The key difference between A387 Grade 22 Class 1 and Class 2 lies in their mechanical properties (tensile strength), not chemical composition, with Class 2 having higher strength.

3What is the chemical composition of ASTM A387 Grade 22 Class1 ?

ASTM A387 Grade 22 Class 1 is a chromium-molybdenum alloy steel for high-temperature pressure vessels, primarily containing about 2.25% Chromium (Cr) and 1.00% Molybdenum (Mo), with controlled amounts of Carbon (C), Manganese (Mn), Phosphorus (P), Sulfur (S), and Silicon (Si), balancing strength, corrosion resistance, and weldability for elevated temperature service.

4What are the primary advantages of ASTM A387 Grade 22 Class1 ?

The primary advantages of ASTM A387 Grade 22 Class 1 steel are its excellent high-temperature strength, superior corrosion and oxidation resistance (due to chromium and molybdenum content), good weldability, and enhanced formability compared to Class 2, making it ideal for weldable pressure vessels, boilers, heat exchangers, and equipment in oil, gas, and petrochemical applications, offering long service life and cost-effectiveness over time.

5What are the typical application fields of ASTM A387 Grade 22 Class1 ?

ASTM A387 Grade 22 Class 1 steel is primarily used in high-temperature, high-pressure applications like welded boilers, pressure vessels, heat exchangers, and petrochemical equipment, offering excellent corrosion and oxidation resistance due to its chromium-molybdenum alloy composition. Key industries include oil & gas, power generation, and chemical processing, where it serves in components like reactors, furnaces, and storage tanks needing superior heat resistance and strength.

6What precautions should be taken when welding ASTM A387 Grade 22 Class1 ?

When welding ASTM A387 Grade 22 Class 1 (a Cr-Mo steel), key precautions involve thorough surface cleaning, preheating the material, using low-hydrogen consumables, controlling interpass temperatures, and performing essential post-weld heat treatment (PWHT) to prevent cracking from its hardenability and hydrogen embrittlement, alongside standard welding safety for fumes, radiation, and electrical hazards.

7What are Common Testing Requirements ASTM A387 Grade 22 Class1 ?

Common testing requirements for ASTM A387 Grade 22 Class 1 steel plates focus on chemical composition (Carbon, Molybdenum) and mechanical properties, primarily tensile strength (60-85 ksi), yield strength (min 30 ksi), and elongation (min 18% in 2 in.), with tests including tensile, impact (optional), NDE, and Charpy V-notch for elevated temps, ensuring suitability for high-temperature pressure vessels.

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