ASTM A302GR.A|A302 Grade A pressure vessel steel plate supplier

The official public listing reviewed for this page is ASTM A302/A302M-17(2022). Its Scope identifies Grade A with tensile strength of 75–95 ksi [515–655 MPa] and describes the specification as particularly intended for welded boilers and other pressure vessels. That scope establishes the material category, not approval for every vessel service. The design specification, ordered edition and agreed acceptance documents still govern the purchase.

Read the Grade A property line before comparing quotations

A useful quotation comparison separates the tensile range, minimum yield and elongation gauge. Grade A’s public-reference minimum yield is 45 ksi [310 MPa]; this is not an error to be replaced with a Grade B number. Equally, a plate with higher reported yield is not automatically an acceptable different grade. Check the full specification identity and the actual requirement, rather than ranking offers by one test result.

Use inch-pound and SI systems independently. The bracketed values are not a set of exact conversions from which to create mixed acceptance criteria. Identify the chosen unit system on the enquiry and maintain it on the order and report review. Neither elongation gauge defines a plate-thickness range. A certificate that gives only an elongation percentage without the gauge basis needs clarification before comparison with the requirement.

Chemistry review starts with Grade A manganese

This table is a public-reference compilation, not the paid official chemical table. The heat/product separation follows a dated Grade A trader compilation, checked against an undated compilation with compressed product-style ranges. Those compressed manganese, silicon and molybdenum ranges must not be treated as heat limits. Carbon’s thickness-dependent maxima apply to both analyses in the compilation note. Product phosphorus and sulfur limits are left blank because separate values were not established.

“Not specified” for nickel does not mean a guarantee of zero residual nickel. It means this reference does not assign a Grade A nickel range. Do not insert the specified nickel band of another grade into the blank requirement. For a purchaser’s restricted chemistry, provide the proposed restriction and its analysis basis for review rather than assuming it is covered by the standard grade designation.

Carbon changes with the stated thickness intervals, while manganese is a range rather than a single maximum. When checking a multi-size material list, identify the carbon row for each line and keep heat and product results labelled. A wider product range cannot be used to excuse a heat result outside its own applicable band. This distinction makes a chemical review more useful than an undifferentiated list of element percentages.

Define the delivery condition without inventing a size cap

The official public Scope limits maximum thickness by the capacity of the composition to meet the specified mechanical properties. It does not provide a universal numerical thickness cap for this page. A commercial rolling range is a different matter and must be reviewed for the actual dimensions; neither that range nor a familiar thickness in an old catalogue should be presented as the specification’s coverage limit.

A dated public compilation restates the delivery pattern as normally as-rolled at 2 in. [50 mm] and under, with normalizing or stress relieving, or both, possible when ordered; above 2 in. [50 mm], normalized. This is a labelled compilation restatement requiring confirmation in the ordered edition, not a quotation from a paid official heat-treatment clause. Agree the condition explicitly, particularly if the fabrication plan includes a later thermal cycle. No treatment temperatures are prescribed here.

Killed steel and conformity to fine-grain requirements appear in the official family abstract and are not exclusive to the nickel grades. Detailed general-requirement references and inspection provisions need review in the governing documents. An ultrasonic examination is not promised as a universal base requirement on this page; if required, identify the method, acceptance level, coverage and reporting expectations in the enquiry.

Build a purchase line that can be checked on receipt

Resolve deviations while the offer is being reviewed. If an offer names another grade, another edition or only an SA designation, ask for the proposed documentary basis and the purchaser’s decision before treating it as compliant. Keep dimensions, required condition and inspection extras visible on the revised order. A vague “equivalent” description does not establish conformity to the specified ASTM Grade A requirement.

The related ASME SA302 Grade A page explains the separate Code-delivery topic. For another ASTM family topic, see ASTM A302 Grade B plate. These links are navigation for distinct procurement questions, not sources for this page’s numerical tables. ASTM and ASME certificates do not establish each other’s acceptance automatically; any dual certification needs explicit agreement.

Buyer questions

Which edition should an ASTM Grade A enquiry identify?

The official public listing reviewed here is A302/A302M-17(2022). State the edition required by the contract rather than leaving the year implicit. This page uses official public Scope for type, tensile range and thickness principle; chemistry, yield, elongation and delivery details are labelled public references.

Is Grade A a nickel-alloy plate?

The official Scope calls Grade A manganese-molybdenum. Nickel is not specified in the Grade A reference table. Do not interpret that as zero residual nickel, or use a nickel-bearing family member’s chemistry as if it belonged to Grade A.

Is 310 MPa the correct Grade A yield reference?

Yes. The Grade A compilations independently support 45 ksi [310 MPa] minimum yield. They also give 15% elongation in 8 in. [200 mm] and 19% in 2 in. [50 mm]. Preserve the gauge information when reviewing a test report.

Can an SA-302 Grade A document replace the ASTM certificate requirement?

Not automatically. The order and supporting evidence must establish conformity to the required ASTM designation and edition. The converse also applies for ASME acceptance. A combined certification route must be agreed and supported, not inferred from similar material names.

Should a thin Grade A plate always be ordered as-rolled?

Not simply because of thickness. The public compilation describes ordinary delivery at 2 in. [50 mm] and under as as-rolled but allows normalizing or stress relieving as ordered. Confirm the applicable edition and the condition required for the project before agreeing the purchase line.