Overview
ASTM A516/A516M covers carbon-steel plate intended primarily for welded pressure vessels in moderate- and lower-temperature service. It contains four strength grades, but a safe order also needs plate thickness, heat-treatment condition, impact requirements, ASTM A20 general requirements, construction-code acceptance and traceable inspection documentation.
Designation and acceptance
ASTM A516/A516M-25 is a pressure-vessel plate product specification, not an equipment design code. Grades 55, 60, 65 and 70 identify strength families within stated thickness and condition rules. ASTM A20/A20M supplies general pressure-vessel plate requirements. Coil-derived plate, normalization, impact testing and supplementary requirements must be treated explicitly rather than inferred from the grade number.
Members and selection
| Designation | Selection context |
|---|---|
| Grade 55 | Lowest nominal tensile-strength family; select only after vessel design, thickness and toughness review. |
| Grade 60 | Pressure plate option balancing strength and fabrication needs under the governing code. |
| Grade 65 | Intermediate strength family requiring the same complete condition and test definition as other grades. |
| Grade 70 | Widely requested higher-strength family; the name alone does not guarantee normalization or impact qualification. |
Comparison framework
| Criterion | Decision context |
|---|---|
| Strength grade | The numeric grade differentiates tensile-strength families; thickness-dependent yield and acceptance values remain specification-controlled. |
| Heat treatment | As-rolled, normalized or otherwise permitted condition must be consistent with thickness, order and construction-code requirements. |
| Impact testing | Charpy requirements need explicit test temperature, orientation, specimen rules and acceptance criteria from the project/code basis. |
| Product versus vessel | A516 qualifies plate material; vessel design, welding, forming, NDE and pressure testing remain under the construction specification. |
Performance
- Strength and toughness depend on grade, thickness, heat treatment and test conditions.
- Through-thickness restraint, hydrogen control and heat input can govern weld integrity in thick fabricated joints.
- Low-temperature suitability cannot be concluded from the words pressure vessel plate without the required impact evidence.
Orderable product scope
- Cut-to-length pressure-vessel plate with traceable heat and test identity.
- Normalized plate where required by thickness, order or vessel specification.
- Coil-derived plate only when permitted and processed/tested under the applicable specification rules.
Processing
- Control thermal cutting, edge preparation and forming strain to the approved vessel fabrication procedure.
- Use qualified welding procedures and manage preheat, interpass temperature, heat input and postweld heat treatment.
- Maintain plate-to-component traceability after cutting and transfer markings under controlled procedures.
Applications
- Shells, heads and pressure-retaining parts for moderate- and lower-temperature vessels.
- Storage and process equipment when the construction code accepts the selected grade and condition.
- Welded pressure components requiring carbon-steel plate with specified toughness and inspection.
Selection
- Select the grade from calculated thickness, allowable stress, fabrication and toughness needs.
- Resolve heat treatment and impact requirements before requesting mill quotations.
- Have the vessel designer approve any grade, condition, thickness or manufacturing-route substitution.
Procurement
- State ASTM A516/A516M-25, exact grade, plate dimensions, thickness range, quantity and unit system.
- State heat-treatment condition, including normalization where required, and whether coil-derived plate is acceptable.
- Define impact test temperature, specimen orientation, energy acceptance, through-thickness or supplementary tests.
- Invoke ASTM A20/A20M, construction code, inspection document, heat/piece traceability, marking, surface and packing.