What is ASTM A20/A20M?
ASTM A20/A20M is the Standard Specification for General Requirements for Steel Plates for Pressure Vessels. It serves as a common requirement specification that applies to a wide range of pressure vessel steel plates.
Rather than defining a specific material grade, it acts as a "master standard" that outlines the mandatory technical requirements for manufacturing, testing, and inspection. It is almost always used in conjunction with specific material specifications (such as A516, A387, or A240).
Key Features and Scope
ASTM A20 establishes the baseline rules for:
General Requirements: Guidelines for manufacturing processes, heat treatment, and chemical composition limits.
Testing and Inspection: Standardized procedures for tension testing, impact testing (Charpy V-notch), hardness testing, and non-destructive examination (e.g., Ultrasonic Testing).
Dimensions and Tolerances: Permissible variations in thickness, width, length, and flatness of steel plates.
Marking and Packaging: Requirements for product identification, coating, packing, and loading to ensure traceability and safety during shipment.
Applicable Materials
This specification covers a broad family of rolled steel plates, including:
Carbon and low-alloy steel plates
Alloy steel plates (e.g., Chromium-Molybdenum)
Stainless steel clad plates
Nickel alloy steel plates
Industry Value
For supply chain professionals, ASTM A20 is the foundation of compliance. It ensures that pressure vessel plates meet rigorous safety and quality benchmarks from production to delivery. Whenever a specific product standard lacks detailed provisions, ASTM A20 serves as the default reference for execution and acceptance.
