| Alloy identity |
NiCr 70/30 is a nominal nickel-chromium alloy designation, generally referring to approximately 70 wt% nickel and 30 wt% chromium. The exact grade, UNS designation, product form, and chemistry limits must be stated in the purchase specification. |
Material grade or UNS designation, product description, heat number, and approved purchase specification. |
Prevents substitution with a similar-looking nickel-chromium alloy that has different chemistry or service performance. |
| ASTM B344 applicability |
ASTM B344/B344M is a specification for nickel and nickel-alloy welding materials, including applicable wire and rod products. It should be cited only when the supplied product form and grade fall within the standard’s scope. |
A certificate of conformity identifying ASTM B344/B344M, the applicable edition, product form, grade, and any supplementary requirements. |
Creates a common technical reference for suppliers, inspectors, customs documentation, and end users in different countries. |
| Chemical composition |
Verify nickel, chromium, iron, carbon, manganese, silicon, and other elements against the exact applicable grade limits. “70/30” is nominal and does not replace grade-specific chemistry requirements. |
Heat-analysis report or material test report with measured values, applicable limits, test method, heat number, and authorized approval. |
Reduces the risk of corrosion, weldability, conductivity, or high-temperature performance problems caused by chemistry variation. |
| Product form and size |
Confirm whether the material is supplied as welding wire, welding rod, spool, straight length, or another form. Diameter, dimensional tolerance, length, and surface condition must be defined by the order. |
Dimensional inspection report, product drawing, packing list, and purchase-order cross-reference. |
Improves interchangeability with automated welding equipment and reduces receiving inspection delays. |
| Mechanical and usability tests |
Where required by the applicable grade or purchase order, verify mechanical, surface, weldability, and other specified acceptance tests. Test requirements should not be assumed solely from the 70/30 designation. |
Test results, sampling plan, laboratory identification, test date, acceptance criteria, and nonconformance status. |
Provides objective evidence that the shipment is suitable for the intended fabrication process. |
| Material certification |
A complete certificate should identify the material, applicable standard, grade, size, quantity, heat number, actual test results, and conformity statement. |
Material Test Report, Certificate of Conformance, certificate revision, authorized signature, and document-control reference. |
Supports technical review, customer approval, regulatory files, and cross-border quality audits. |
| Batch-level traceability |
Each package, spool, coil, or bundle should remain linked to a unique heat, lot, or batch number from production through shipment and final use. |
Permanent package label, heat or lot number, barcode or QR reference where used, packing list, production record, and shipment record. |
Enables targeted containment, recall, root-cause analysis, and replacement without placing unrelated batches on hold. |
| Segregation and identification |
Different grades, heats, diameters, and production conditions should be physically or electronically segregated to avoid mixed lots. |
Warehouse procedure, identification photographs, receiving checklist, and lot-control records. |
Reduces the likelihood of mislabeling or accidental use of the wrong alloy during international distribution. |
| Packaging and preservation |
Packaging should protect the wire or rod from moisture, contamination, deformation, and label loss during storage and ocean or air transport. |
Packaging specification, moisture-protection method, package weight, external identification, and export packing record. |
Maintains surface condition and documentation integrity across long supply chains. |
| Inspection and verification |
Use risk-based incoming inspection covering identity, package labels, dimensions, surface condition, documentation, and sampling requirements defined in the purchase order. |
Inspection plan, receiving report, sampling records, calibrated equipment records, and nonconformance report when applicable. |
Provides independent confirmation that delivered material matches the certified and ordered specification. |
| Purchase-order controls |
State the exact grade, product form, size, ASTM edition, supplementary tests, certification requirements, traceability requirements, packaging, and change-notification rules. |
Approved purchase order, technical data sheet, quality clause, and controlled change record. |
Turns general alloy terminology into measurable acceptance criteria for international procurement. |
| Acceptance decision |
Accept only when the product form is within ASTM B344/B344M scope, the specified grade is confirmed, certification is complete, and each package can be traced to the supporting batch records. |
Document review checklist, inspection release, deviation approval, and final shipment release record. |
Creates a consistent, auditable decision process for suppliers and receiving locations worldwide. |
