ASTM A387GR2CL1|ASTM A387GR.2CL.1 Steel Plate supplier

Establish which requirements must survive a quotation revision

The current official public specification identified for this page is A387/A387M-25. Official Scope describes chromium-molybdenum plates intended primarily for elevated-temperature welded boilers and pressure vessels. Grade 2 is nominally 0.50% chromium and 0.50% molybdenum. The grade has two tensile classes; Class 1 needs to remain explicit wherever the material is named, even if the dimensions or quantities are later revised.

A change in quantity is not necessarily a change in material requirement. A change in class, delivery condition or acceptance scope is a different matter and should be visible to the purchaser. Supply the controlling schedule revision and identify any conflicting drawing note for clarification. An alternative should not become the base requirement merely because it appears in a later commercial attachment.

Include dimensions and quantities in the enquiry, but do not assume that a published grade description confirms a rolling size or delivery commitment. Official Scope limits maximum thickness by the composition’s capacity to meet specified mechanical properties. This is not a numerical specification cap or a claim about manufacturing capability. The requested size and the full acceptance basis need to be considered together.

Review the two chemical analysis columns separately

Official Table 1 was not inspected, and the figures above are not presented as its current text. They are compilation references for confirmation in the ordered edition. The heat manganese band of 0.55–0.80% has support from two independently reviewed Grade 2 references. Product manganese at 0.50–0.86% comes from one dated September 2026 compilation only; the second source has no product-analysis column. That narrower evidence basis must remain visible during review.

The product manganese entry is therefore not a twice-confirmed official requirement. Resolve the applicable product limit in the ordered specification rather than filling the gap with a value found in an older supplier table. The same edition check applies to the compilation phosphorus and sulfur maxima. Blank element cells are deliberately unassigned and do not certify that those elements are absent.

Carbon illustrates the importance of preserving the headings: heat 0.05–0.21% and product 0.04–0.21% are different analysis ranges. Silicon, chromium and molybdenum also have separate bands. A single unlabelled composition row can lose those distinctions when transferred between documents. Chemistry is organized by grade, not class, so it cannot by itself establish the selected tensile level or the condition in which the plate is delivered.

Use the independently confirmed Grade 2 Class 1 mechanical set

This Class 1 set was independently confirmed in two dated Grade 2 compilations, one from September 2026 and one dated May 2024. It is not an assumed family-wide row, and matching numbers on a different grade would not make that grade the evidence source. Official Tensile Requirements tables were not read. Use the ordered documents to establish the complete specimen provisions and applicable adjustments before accepting test results.

The tensile range and yield minimum should each remain visible. A result in one category cannot substitute for a missing result in another, and a different alloy’s stronger-looking range is not an automatic correction to the purchase requirement. If a quotation proposes a different class or grade, raise it as an alternative for technical review rather than overwriting the original row in a comparison worksheet.

Both elongation gauges are retained because these Grade 2 Class 1 references establish both. They are specimen gauge lengths, not thickness bands. Likewise, ksi and MPa are independent unit systems, not exact conversions to combine during acceptance. State the governing system and preserve it consistently across the enquiry, size schedule and test-result comparison.

Make thermal condition an agreed field, not an unstated assumption

The official abstract states that the steel is killed and thermally treated. The reviewed Class 1 compilation describes usual delivery options as annealed, normalized and tempered, or accelerated cooling followed by tempering, with annealed plate described as Class 1 only. This is a compilation restatement, not the official heat-treatment clause. Confirm the selected route in the ordered edition and project instructions rather than importing a generic treatment list.

An as-rolled description does not establish the required thermal condition. No treatment temperatures are prescribed on this page. Any purchaser-required impact tests, additional examinations, fabrication-related testing conditions or certificate form need explicit criteria and agreement. The material name alone does not establish those items, and this product reference offers no welding or impact guarantee.

ASTM and ASME acceptance must also remain distinct: an ASTM certificate alone is not SA-387 acceptance, and the reverse is not automatic. Specify the governing documents and Code edition if both are required. For related family topics, visit Grade 5 Class 1 and Grade 9 Class 1. These links are navigation only, not technical sources or substitution approval.

Buyer questions

Which details should remain on a revised Grade 2 quotation?

Keep the complete specification, grade, Class 1 designation and ordered edition attached to the revised size and quantity schedule. Show any material, condition or inspection change separately so the purchaser can review it explicitly.

Is 380–550 MPa a reason to replace this row with another grade’s values?

No. The independently checked Class 1 reference is 55–80 ksi [380–550 MPa], with yield minimum 33 ksi [230 MPa]. The selected grade-and-class basis should not be overwritten to make a family comparison appear uniform.

What qualification applies to the product manganese band?

The displayed 0.50–0.86% is a single-compilation product reference. Heat 0.55–0.80% has two-source support, but the second source supplies no product column. Confirm the product limit in the ordered edition before using it for acceptance.

Does Class 1 mean that one specific thermal route is compulsory?

Not on the basis of this page. The labelled Class 1 compilation includes annealed, normalized-and-tempered and accelerated-cooling-plus-temper options. Resolve the required condition against the governing specification and project needs.

Can a certificate request be left until receiving inspection?

It is better to identify the required document form and plate/heat linkage in the enquiry. Receiving review needs evidence against the agreed order, not an assumption about which certificate or additional tests accompany every plate.