Compare ASTM and EN steel specifications with a record that preserves both requirement sets and shows the evidence for the offered product. A grade cross-reference can identify a candidate for investigation. The release decision needs the actual requirements, unresolved differences and the responsible technical approval.
This guide assumes that two specifications have already been proposed for one purchase. Use the strength-grade selection guide when choosing the material initially. The working record below addresses a narrower question: what supports this particular comparison, and what remains unproved?
1. Fix the comparison boundary
Give the record a revision and identify the purchase item, product form, dimensions, full grade designation and delivery condition. Record each standard’s complete designation, edition and applicable options. Keep the customer’s required specification in one column and the supplier’s offered specification in another; identify which is ASTM and which is EN. Either may be the contractual requirement.
List referenced general requirements, dimensional documents and project additions. Use the standards directory to locate the right family, then obtain the applicable documents. The official source notes identify public catalogue starting points; those pages do not replace licensed texts. Stop the comparison if the offered product falls outside a selected document’s scope. A change of thickness, delivery condition or order revision requires a fresh applicability check.
2. Keep requirements, results and claims separate
Use three evidence layers. First record what the contractual documents require. Next record what the offered product is declared to satisfy and the supporting certificate or test report. Finally retain the supplier’s commercial statement, including any claimed substitution. Keep document identifiers, revisions and the relevant clause or report location beside each entry.
A certificate result belongs to its identified heat, lot or product and stated test basis. Ask how that identity connects to the offered stock. A supplier statement of “equivalent” needs supporting evidence for each affected requirement. A previous accepted delivery can help locate records, but cannot approve a new unidentified lot. If the applicable text or traceability is missing, mark the affected entry as not established and name the person who will obtain it.
3. Build the requirement-by-requirement matrix
Create one row per applicable requirement, with separate required and offered columns. Add the acceptance basis, evidence reference, finding and action owner. The following editorial worksheet suggests comparison fields; it supplies no material limits or standard equivalence.
| Requirement group | Preserve on both sides | Evidence question |
|---|---|---|
| Product and delivery | Form, dimensions, grade suffixes and delivery condition | Do both entries describe the offered item? |
| Chemical requirements | Specified elements, analysis basis and applicable limits | Does the report support the required analysis basis? |
| Mechanical requirements | Property, thickness range, specimen and test conditions | Can the result be assessed against this requirement? |
| Dimensions and surface | Governing document, tolerance class and agreed options | Is the relevant inspection evidence available? |
| Inspection and identity | Sampling, document requirement and product traceability | Do the records identify the material being offered? |
| Project additions | Drawing requirements, supplementary tests and approved exceptions | Who may resolve each open difference? |
Scroll within the table to see all columns →
Split a broad row whenever it contains several acceptance decisions. Chemistry may need multiple entries; mechanical properties may need separate strength, elongation and impact entries where applicable. Retain requirements that are absent from the other specification as visible gaps. Do not silently drop them to make the two columns look symmetrical.
4. Preserve units and test conditions
Keep original units and the governing acceptance values in the record. Put any convenience conversion in a separate, clearly labelled field with its basis. ASTM A6/A6M treats its two unit systems independently; avoid mixing their acceptance values. See the official source . Check the applicable edition before using any conversion in an order decision.
For mechanical evidence, compare the specified method, specimen dimensions, orientation, location and temperature wherever relevant. Record a difference even when the reported numbers appear similar. A stronger-looking result does not close a missing test-condition entry. Ask the responsible technical reviewer whether the evidence is comparable, whether another record is needed, or whether an agreed additional test is appropriate. Do not invent a conversion between incompatible test bases.
5. Resolve differences without inventing equivalence
Use explicit findings: supported on the verified basis; different; not established; or awaiting project approval. Keep factual findings separate from release authorization. “Different” may lead to an accepted deviation, rejection or further evidence; the article cannot choose that outcome for a project. Record who is authorized to decide and what evidence they used.
For example, suppose a supplier’s report lists strength results while the required record also calls for an impact assessment. If the relevant impact evidence is absent, keep that entry open and request the specified evidence or a formally authorized disposition. Do not infer the missing result from strength. In a second hypothetical case, both sides contain elongation figures but the specimen basis is not recorded on one side. Obtain the missing basis before treating those figures as comparable. Neither example identifies an equivalent grade pair.
6. Release a bounded decision record
Attach the completed matrix, document list, supplier confirmations and signed or otherwise controlled dispositions to the purchase specification . Record the approved product identity, scope, decision date and responsible approver. State any conditions that still govern supply or receiving inspection. Material comparison alone does not establish permission under the project’s design code or contractual approval process.
Keep the original requirements visible after an exception is approved. Record the exception alongside them, including its limits and applicability to this order. Reopen the affected entries when the product, source document or delivery condition changes. The useful output is a traceable decision for an identified purchase, with its remaining conditions available to procurement and inspection.