Alloy Steel ASTM A387 Plate

Types of Alloy Steel ASTM A387 Plate:

ASTM A387 specifies various grades of alloy steel plates primarily intended for elevated temperature service in welded boilers and pressure vessels. Common grades include A387 Grade 11, Grade 12, Grade 22, and Grade 91.

ASTM A387 Grade 11 Plate

ASTM A387 Grade 12 Plate

ASTM A387 Grade 22 Plate

ASTM A387 Tensile Requirements for Class 2 Plates

Sizes:

Alloy Steel ASTM A387 plates come in various thicknesses ranging from 5mm to 150mm and widths typically ranging from 1000mm to 4500mm. Lengths can be customized according to customer requirements.

Manufacturing Process:

These plates are typically manufactured through hot rolling or controlled rolling followed by heat treatment. The process involves melting alloy steel ingots, casting them into slabs, and then hot rolling the slabs into plates. Heat treatment processes such as normalization or tempering may follow to achieve desired mechanical properties.

Surface Treatments:

After manufacturing, Alloy Steel ASTM A387 plates may undergo surface treatments such as shot blasting, pickling, or machining to improve surface finish and remove any surface defects.

Packaging:

Alloy Steel ASTM A387 plates are usually packed in wooden cases or pallets to prevent damage during transportation. They are wrapped with moisture-proof material and secured with steel bands to ensure safe delivery.

Applications:

Alloy Steel ASTM A387 plates are commonly used in industries such as petrochemical, oil and gas, power generation, and chemical processing. They are specifically designed to withstand high temperatures and pressures in boilers, pressure vessels, and heat exchangers.

Q&A:

Q: What are the welding considerations for Alloy Steel ASTM A387 plates?

A: Welding of these plates requires careful consideration of preheating, post-weld heat treatment, and selection of compatible welding consumables to avoid issues such as hydrogen cracking and reduced toughness.

Q: Are Alloy Steel ASTM A387 plates suitable for sour service applications?

A: Certain grades of A387 plates with enhanced corrosion resistance, such as Grade 22 and Grade 91, may be suitable for sour service applications in the oil and gas industry. However, compatibility with specific sour environments should be verified.

Q: What are the mechanical properties of Alloy Steel ASTM A387 plates?

A: Mechanical properties vary depending on the grade and heat treatment condition. Generally, these plates exhibit high tensile strength, excellent toughness, and good creep resistance at elevated temperatures.

Q: Can Alloy Steel ASTM A387 plates be used in cryogenic applications?

A: These plates are not typically recommended for use in cryogenic applications due to the risk of embrittlement at low temperatures. Alternative materials with better low-temperature toughness should be considered for such applications.

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