An SA-516 Grade 55 purchase needs a defined acceptance basis
Gangsteel handles enquiries for ASME SA-516 Grade 55 pressure vessel plate. For Code work, specify the material standard and edition required by the project, not only a commercial grade description. The purchase should connect the plate schedule, delivery condition, test requirements and certificate to the same agreed basis.
Grade 55 is the lowest strength level in this SA-516 family. That does not reduce the need for the specified documentation. Use SA-516 or SA-516M, identify the inch-pound Grade 55 or SI Grade 380 unit system, and provide the governing construction Code section and year where applicable.
Make the requisition and certificate agree before acceptance
| Purchase item | Evidence to address |
|---|---|
| Material specification | Required SA designation, grade and edition consistent with the governing Code. |
| Plate schedule | Dimensions, quantities, identification and dimensional tolerances. |
| Delivery condition | Required condition and the condition actually supplied. |
| Tests and supplementary requirements | Heat analysis, tensile results and any ordered impact, ultrasonic, product-analysis or simulated-PWHT records. |
| Dual certification, if requested | Both ASTM and ASME designations and editions agreed on the order and named in the certificate. |
Match heat identity and plate identification to the documents submitted for the supplied material. An ASTM-only certificate, a different SA edition or a mill’s multiple-standard product description is not automatically acceptable against an order naming a specific SA edition. Follow the project or Code approval route required by the contract for any proposed alternative.
Use the Grade 55 family chemistry references on the right basis
The mass-percent tables below draw on the ASTM Grade 55 public-reference sources for the A516 / SA-516 family. They are not an official extract of any named ASME BPVC Section II, Part A edition and are not a dual-certification guarantee. Acceptance follows the SA designation, edition and unit system named in the order and certificate.
Carbon is a thickness-dependent maximum, not a single minimum-to-maximum range. The manganese requirements are also Grade-55-specific: the thicker-plate heat range starts at 0.60%, and the separate Grade 60 thin-plate option does not apply here. Keep heat and product-analysis results on their respective bases.
| Plate thickness | Heat analysis | Product analysis |
|---|---|---|
| ½ in. [12.5 mm] and under | 0.18 | 0.18 |
| Over ½ in. to 2 in. [12.5 to 50 mm], incl. | 0.20 | 0.20 |
| Over 2 in. to 4 in. [50 to 100 mm], incl. | 0.22 | 0.22 |
| Over 4 to 8 in. [100 to 200 mm], incl. | 0.24 | 0.24 |
| Over 8 in. [200 mm] | 0.26 | 0.26 |
| Plate thickness | Heat analysis | Product analysis |
|---|---|---|
| ½ in. [12.5 mm] and under | 0.60–0.90 | 0.55–0.98 |
| Over ½ in. [12.5 mm] | 0.60–1.20 | 0.55–1.30 |
| Element | Heat analysis | Product analysis |
|---|---|---|
| Silicon | 0.15–0.40 | 0.13–0.45 |
| Phosphorus, maximum | 0.025 or 0.035; see source note | 0.025 or 0.035; see source note |
| Sulfur, maximum | 0.025 or 0.035; see source note | 0.025 or 0.035; see source note |
Select the thickness row within the ordered unit system. In the public reference rule, each 0.01 percentage point reduction below the carbon maximum for that thickness permits 0.06 percentage point additional manganese above its specified maximum, up to 1.50% by heat analysis and 1.60% by product analysis. Its use must remain consistent with the specified SA edition.
P/S reference values do not select the SA edition for you
Phosphorus and sulfur each have two maxima in the public references, applying to both heat and product analysis:
- 0.035% is recorded in public tables identified with ASTM A516/A516M-06 and SA-516 described as identical with that edition.
- 0.025% appears in the January 2022 PipingMart compilation without a printed ASTM year, and in compilations citing A516/A516M-25. This is a public reference, not a confirmed official value of any named current ASTM or ASME edition. The sources do not establish which edition introduced the figure.
Acceptance must use the edition on the order. Neither a published compilation nor a mill’s tighter product chemistry changes that contractual basis.
Mechanical references for reviewing the proposed material
ASTM’s A516/A516M-25 public Scope supports the family tensile ranges. The 30 ksi yield minimum and the two elongation minima are public-compilation figures from Ferrobend and PipingMart, rather than a Grade 55 mill required-property table. Use the required SA edition to establish the applicable acceptance requirements.
| Property | Published reference value | Source basis / conditions |
|---|---|---|
| Tensile strength, Grade 55 | 55–75 ksi | Inch-pound; official ASTM A516/A516M-25 public Scope. |
| Tensile strength, Grade 380 | 380–515 MPa | SI; official ASTM A516/A516M-25 public Scope. |
| Minimum yield strength | 30 ksi | Inch-pound; Ferrobend and PipingMart public compilations. |
| Minimum elongation, 2 in. [50 mm] gauge | 27% | Public compilations; A20/A20M or corresponding SA-20 thickness adjustments apply. |
| Minimum elongation, 8 in. [200 mm] gauge | 23% | Same public-compilation and adjustment basis. |
The inch-pound and SI values are independent, not exact conversions. Take the SI yield requirement from the ordered SA edition rather than converting 30 ksi. The reported elongation must retain its gauge length and the applicable A20/A20M or corresponding SA-20 thickness adjustments.
Delivery instructions and impact requirements must remain explicit
The public family compilations state that plate over 1.50 in. [40 mm] shall be normalized. Plate at and below that thickness is normally as-rolled unless ordered otherwise; thinner plate requiring notch-toughness testing is described as normalized unless the purchaser specifies otherwise. Establish the applicable provisions from the ordered SA edition, not from a supplier’s general delivery practice.
Require the actual delivery condition in the material documents. If impact testing is ordered, define temperature, orientation, acceptance criteria and the governing requirement, and request the corresponding results. A heat-treatment condition and an impact-test result are separate items of evidence.
Corresponding names and higher strength grades
| Related material | Purchase consequence |
|---|---|
| ASTM A516 Grade 55 steel plate | Corresponding ASTM family designation, not a substitute for the required SA certificate. |
| ASME SA516 Grade 60 steel plate | A higher strength level, with different Grade 60 chemistry provisions; requires an approved grade change. |
| ASME SA516 Grade 65 steel plate | A different ASME grade, not a way to leave a Grade 55 order unchanged. |
| ASME SA516 Grade 70 steel plate | Another higher strength selection. A common family name does not remove design or Code review requirements. |
Acceptance questions for SA-516 Grade 55
Which material designation belongs on a Code purchase order?
Use the SA designation and edition required by the governing construction Code and project documents, with the grade and unit system. A combined commercial A516/SA516 description is not a complete instruction. Resolve the required edition and certification before accepting an offer or reviewing a proposed alternative.
Can a public Grade 55 table certify the SA edition?
No. Public family references help identify the likely requirements to address, but they do not certify material to a named ASME edition. Review the certificate, reported results and ordered tests against the SA specification and project requirements actually named in the contract.
Why does the chemical review need both thickness and analysis type?
Carbon maxima and manganese ranges depend on the plate thickness, while manganese and silicon also have different heat and product-analysis limits. Keep those details with the reported results. A chemistry number without its applicable thickness and analysis basis is not enough to decide acceptance.
What must an agreed dual certificate identify?
It must evidence both specified designations and editions for the material supplied, tied to the heat and plate identification. Request dual certification explicitly in the order. The presence of both names in a mill catalogue or on a product page does not establish it for an individual plate.
Does ordering SA-516 Grade 55 settle the impact-test conditions?
The grade name does not provide a test temperature or absorbed-energy criterion. Where the project requires impact testing, put the full conditions on the order and obtain results on that basis. Record the delivery condition separately rather than treating normalizing as proof that the impact requirement has been met.
Send the SA-516 Grade 55 material requisition
Please include the documentation requirements as well as the plate dimensions:
- SA designation, grade, required edition, unit system and applicable Code details.
- Plate schedule, identification, tolerances and delivery condition.
- Supplementary tests with methods, acceptance criteria and report scope.
- Certificate content and any ASTM/ASME dual-certification requirement.
- Destination, requested delivery date and project approval conditions.
Gangsteel can assess the stated purchase requirements for an order-specific offer.
Availability, document scope and delivery terms are subject to the quotation for the specific order.