ASTM A387 Grade 2 Class 2: compare the complete tensile requirement
For a Gangsteel enquiry, ASTM A387 Grade 2 Class 2 should be evaluated on its own material requirements, not on a stronger-looking row from another alloy. Its independently checked Class 2 tensile range differs from several familiar A387 grades, even where the yield minimum is shared. Keeping that distinction visible helps purchasers compare the plate they actually specified instead of an assumed family-wide strength package.
The Grade 2 Class 2 row has its own tensile range
| Property | Reference value | Acceptance-review note |
|---|---|---|
| Tensile strength | 70–90 ksi [485–620 MPa] | Grade-specific Class 2 range |
| Yield strength, minimum | 45 ksi [310 MPa] | Minimum, not the tensile lower bound |
| Elongation, minimum; 8 in. [200 mm] gauge | 18% | Keep the longer gauge identified |
| Elongation, minimum; 2 in. [50 mm] gauge | 22% | Keep the shorter gauge identified |
The mechanical set was independently confirmed on two dated Grade 2 compilations, one from September 2026 and one dated May 2024. It is not inferred from an existing supplier body or from another grade’s values. Official Tensile Requirements tables were not inspected, and paid full text was not read. The figures above are a labelled compilation restatement to check against the ordered documents, including applicable specimen and adjustment provisions.
A matching yield minimum does not make two tensile ranges interchangeable. In a document comparison, retain tensile strength, yield strength and specimen information as separate entries. A row headed simply “strength” can hide which property is being discussed. If a proposed alternative uses a different tensile range, request an explicit material-deviation review rather than treating the common yield value as evidence that the purchase requirement is unchanged.
The elongation figures are gauge-length minima, not thickness bands. Both gauges are established in these Grade 2 references, so both are retained. Inch-pound and SI values are independent unit systems rather than exact conversions; the governing system should be clear on the order. Avoid applying a percentage or rounded conversion from an unrelated comparison row without its original basis.
Low nominal chromium does not remove the grade-and-class requirements
The current official public edition identified is A387/A387M-25. Its Scope covers chromium-molybdenum plates intended primarily for elevated-temperature welded boilers and pressure vessels. Grade 2 is listed at nominal 0.50% chromium and 0.50% molybdenum. It is available in two tensile classes, and this page addresses Class 2. Neither the low nominal chromium description nor a chemistry result selects the class on the purchaser’s behalf.
| Field | Purchaser input | Clarification needed when missing |
|---|---|---|
| Specification and class | A387 or A387M, Grade 2, Class 2, ordered edition | Which exact material is being quoted? |
| Size and quantities | Thickness, width, length, quantity and governing units | Does each size belong to this requirement? |
| Required condition | Thermal delivery state and relevant project notes | What condition should the results represent? |
| Inspection | Tests, specimen requirements and acceptance criteria | Which additional requirements are agreed? |
| Documents | Required certificate form and plate/heat identification | What evidence is needed for receiving review? |
This information is useful before price comparison because a quotation with an undefined condition or inspection basis may not cover the same requirement as a complete offer. Send the controlling material-schedule revision and identify purchaser additions separately. If quantity, dimensions or document requirements change, retain the grade and Class 2 designation in the revised request so the technical basis remains traceable.
Add heat analysis without overstating the product manganese evidence
| Element | Heat analysis | Product analysis |
|---|---|---|
| Carbon | 0.05–0.21 | 0.04–0.21 |
| Manganese | 0.55–0.80 | 0.50–0.86 |
| Silicon | 0.15–0.40 | 0.13–0.45 |
| Chromium | 0.50–0.80 | 0.46–0.85 |
| Molybdenum | 0.45–0.60 | 0.40–0.65 |
| Phosphorus, max | 0.025 | 0.025 |
| Sulfur, max | 0.025 | 0.025 |
| Ni, V, Nb, B, N, Al, W |
Official Table 1 was not inspected. The chemical split is a labelled compilation reference and must be confirmed in the ordered edition. In particular, product manganese at 0.50–0.86% is printed in one reviewed September 2026 compilation only; the second Grade 2 source provides no product-analysis column. It is therefore not presented as a twice-confirmed official limit. Resolve the applicable product manganese requirement before using it for acceptance.
The heat manganese band of 0.55–0.80% is independently supported by both Grade 2 references. Keep that basis distinct from the product band. Silicon, chromium and molybdenum likewise have separate heat and product intervals. This matters when an attachment contains a single compressed composition row: the reviewer needs the analysis heading, not just a collection of percentages that appears broadly consistent with the alloy shorthand.
Phosphorus and sulfur at 0.025% maximum are dated-compilation figures to verify in the ordered specification, not a quotation from an unread official table. Unassigned element cells remain blank and do not mean zero content. Chemistry is grade-based rather than class-based, but a satisfactory chemical comparison alone cannot establish the selected tensile class, thermal condition or complete material acceptance.
Specify a Class 2 delivery route, not a generic grade treatment list
Official abstract states that the steel is killed and thermally treated. The reviewed Class 2 compilation describes usual delivery as normalized and tempered, or accelerated cooling followed by tempering, and states that the Class 2 tensile basis is not applicable to annealed plate. This is a compilation restatement, not the official heat-treatment clause. A generic list of treatments for the grade should not be mistaken for a Class 2 delivery instruction.
Confirm the required route in the ordered edition and record the agreed condition. No normalizing or tempering temperatures are prescribed here. Any required impact testing, additional examination or fabrication-related testing condition needs the purchaser’s express criteria; none is guaranteed by this product description. A requested certificate form is similarly a contract-review item rather than an assumed default.
Official Scope makes maximum thickness dependent on the composition’s capacity to meet specified mechanical properties. That is not a numerical cap or a claim of available rolling sizes. For related higher-chromium family topics, see Grade 5 Class 2 plate and Grade 9 Class 2 plate. These links are navigation only, not technical sources or approval to replace Grade 2.
Buyer questions
Should the tensile range be changed because another Class 2 grade has higher values?
No. The independently checked Grade 2 Class 2 reference is 70–90 ksi [485–620 MPa]. Class 2 is a class within a particular grade, not one universal tensile row across the family. Any proposed material change needs its own review.
Does the shared 45 ksi yield minimum establish equivalence?
No. The labelled yield minimum is only one mechanical property. Tensile range, chemistry, specimen basis, delivery condition and all ordered requirements still matter. A single matching result cannot establish that a different plate is an acceptable substitute.
How should product manganese be treated during enquiry review?
The displayed 0.50–0.86% band is a single-compilation product reference, while heat 0.55–0.80% has two-source support. Confirm the product requirement in the ordered edition; do not describe it as an inspected official limit or silently use a different unconfirmed band.
Why must both elongation gauges remain on the comparison?
The Grade 2 Class 2 references provide 18% in 8 in. [200 mm] and 22% in 2 in. [50 mm]. They are different specimen gauge lengths. Retaining both prevents a report from being assessed against a percentage detached from its test basis.
Can SA-387 documentation automatically replace the ASTM requirement?
No. An ASTM certificate alone does not establish SA-387 acceptance, and the reverse is not automatic. If the order needs both, agree the governing specifications, relevant Code edition and evidence for each without assuming automatic dual certification.
Enquire about Grade 2 Class 2 on the project basis
Send the material schedule, specification edition, dimensions, quantity and governing units. Include thermal-condition instructions, required tests and certificate form, and identify any product-analysis questions so Gangsteel can review the enquiry without substituting another grade’s requirements.