ASTM A612 is a specification for pressure vessel quality (PVQ) steel plate intended for use in moderate and lower temperature service. It is primarily used in the fabrication of welded pressure vessels where improved notch toughness is required.
The A612 grade PVQ steel plate is categorized into three different classes: Class 1, Class 2, and Class 3. Each class has specific requirements for chemical composition, tensile strength, and notch toughness.
A612 Class 1 PVQ steel plate has a minimum yield strength of 345 MPa and a tensile strength ranging from 550 to 690 MPa. It offers good notch toughness at low temperatures.
A612 Class 2 PVQ steel plate has a minimum yield strength of 390 MPa and a tensile strength ranging from 590 to 725 MPa. It provides improved notch toughness compared to Class 1.
A612 Class 3 PVQ steel plate has a minimum yield strength of 450 MPa and a tensile strength ranging from 550 to 690 MPa. It offers the highest notch toughness among the three classes.
When using ASTM A612 grade PVQ steel plate, it is important to adhere to the specified requirements for welding, heat treatment, and fabrication outlined in the standard to ensure proper performance and compliance with industry regulations.
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