Overview
ASTM B443-26 covers rolled UNS N06625 and UNS N06219 nickel-alloy plate, sheet and strip. N06625 includes distinct heat-treatment grades for different service-temperature intent. Buyers must specify alloy, grade/condition, product form, dimensions, surface, tests, B906 general requirements and equipment-code acceptance.
Designation and acceptance
B443 is not a universal nickel-alloy flat-product standard. For N06625, Grade 1 is annealed and normally associated with lower service temperatures, while Grade 2 is solution annealed for service where creep and rupture resistance are required; N06219 is solution annealed. Hot working or reannealing can change properties, so delivered condition and subsequent fabrication heat exposure must remain controlled.
Members and selection
| Designation | Selection context |
|---|---|
| N06625 Grade 1 | Annealed condition selected for the intended temperature/corrosion/fabrication regime, not by alloy trade name alone. |
| N06625 Grade 2 | Solution-annealed condition used where the design requires its elevated-temperature property basis. |
| N06219 | Solution-annealed nickel-chromium-molybdenum-silicon alloy within the standard's specific scope. |
| Plate / sheet / strip | State exact form because dimensions, flatness, edge, coil handling and sampling expectations differ. |
Comparison framework
| Criterion | Decision context |
|---|---|
| Alloy scope | B443 covers named UNS alloys; other corrosion-resistant nickel alloys use other B specifications. |
| Grade/heat treatment | N06625 Grade 1 and Grade 2 are condition/service distinctions, not interchangeable certificate labels. |
| Product geometry | Plate, sheet and strip require separate dimensional, edge, flatness and packaging decisions. |
| General requirements | B906 supplies common flat-product requirements, while B443 and the purchase order control conflicts. |
Performance
- Acceptance under ASTM B443 Nickel Flats depends on the exact alloy or grade, delivered condition, product geometry and specified test basis rather than the standard number alone.
- Heat-treatment history, surface contamination, hot cracking control and fabrication heat exposure can govern final performance.
- Service suitability remains an engineering decision: the Nickel 625 name does not identify B443 form, Grade 1/2 condition, thickness, inspection or pressure-code acceptance.
Orderable product scope
- N06625 or N06219 plate with thickness, width, length, flatness and cut-edge controls.
- Nickel-alloy sheet for forming and welding with declared surface and condition.
- Nickel-alloy strip in coils with width, edge, coil geometry and telescoping protection.
Processing
- Prevent carbon steel contamination and use dedicated clean tools during cutting and forming.
- Qualify welding consumables, heat input and interpass control for alloy, thickness and service.
- Track any hot working, solution annealing, pickling or descaling that could change delivered properties.
Applications
- Chemical-process vessels, internals and ducting using qualified N06625/N06219 flat products.
- Marine, pollution-control and high-temperature fabrications after code and corrosion review.
- Formed or welded components where the selected B443 condition survives the fabrication route.
Selection
- Confirm that ASTM B443 Nickel Flats actually covers the required product form and manufacturing route before comparing grades or quotations.
- Select alloy or grade and delivered condition from service, fabrication, section size and required property evidence; do not infer condition from a trade name.
- Require a written technical comparison and responsible-engineer approval before substituting another standard, alloy, condition or product route.
Procurement
- State ASTM B443-26, UNS alloy, N06625 Grade 1/2 or N06219 condition and plate/sheet/strip form.
- State thickness, width, length or coil data, quantity, tolerances, flatness, edge and surface requirements.
- Define tensile, chemistry/product analysis, grain size or supplementary examination and fabrication heat-treatment limits.
- Invoke ASTM B906-22 and require inspection report, heat/lot traceability, low-contamination marking and protected packing.