Chemistry and PSD
Ask for the certificate of analysis, particle-size distribution, and the test-method date on the 316L lot that will feed the nest. A catalog grade name is not a lot.
QUOTE DESK
Additive manufacturing metal powder suppliers
This desk compares additive manufacturing metal powder suppliers when a 316L DMLS bracket nest includes powder as a cost line, and it also compares print houses that consume that powder. Custom Metal 3D Printing Sourcing does not warehouse drums and does not certify a mill. A cheaper drum is not compared against a fully certified heat unless both bidders answer the same chemistry, PSD, reuse, and document questions.
Write ASTM / AMS or customer spec for 316L, whether virgin-only powder is mandatory, reuse-cycle limit, and whether the purchase is powder only, printed coupons, or production brackets with powder inside the piece price. Destination, Incoterm, and optional budget sit in the same brief so freight is visible beside HIP. The as-built vs HIP density note still belongs on the printed-part line even when powder is quoted separately.
SIX CHECKS EVERY BIDDER ANSWERS
What additive manufacturing metal powder suppliers must put on one sheet
Reuse and blending
Record virgin-only versus blended reuse, the sieve rule, and who owns unused powder after the bracket campaign.
Packaging and moisture
Confirm drum size, inert backfill, humidity limits, and whether opened drums can be returned to the mill.
Print-route ownership
Separate powder merchants from DMLS print houses. A broker paragraph is not a machine envelope or a HIP furnace list.
Documents and export
Request CoC, SDS, conflict-mineral notes, and any ITAR or dual-use statement before a US destination is locked.
Cost exclusions
List HIP, heat treatment, support removal, machining, FAI, and freight outside the drum or piece price. Density test method is an extra unless it is written as included.
SAME-SCOPE COMPARE
Powder-lot buy versus printed 316L bracket buy
Use the table as a question matrix for the bracket buyer. Values are prompts, not factory promises. Lead time, MOQ, Cpk, and density remain unconfirmed until the named supplier writes them against your revision. Industry published DMLS bands such as 20–60 μm layer class and 250×250×320 mm envelope are questions to ask, not machines this desk owns.
| Comparison line | Powder-lot RFQ | Printed-part RFQ |
|---|---|---|
| Primary unit | Kilogram or drum, 316L + PSD | Bracket piece or nest, 316L + DMLS route |
| Revision lock | Powder specification and test method | Drawing revision plus GD&T datums on the bracket |
| Build volume / layer class | Not applicable unless coupons are included | Ask machine envelope and 20–60 μm DMLS class if used |
| Inspection | Chemistry, PSD, flow, and moisture | FAI, CMM or 3D scan, as-built vs HIP density note, hardness HRC/HV |
| Typical extras | Freight, duties, unused-powder return | HIP, machining stock, support removal, packing |
| Documents | CoA, SDS, lot genealogy | CoC, powder cert, FAI pack, density method |
CHECKLISTS YOU CAN REQUEST
Compact list of buyer worksheets
These are requestable outlines for a 316L DMLS nest, not hosted factory brochures. Use the form if you want the worksheet attached to your RFQ thread.
- RFQPowder lot comparison sheet1 page
Chemistry, PSD, reuse, packaging, Incoterm.
- RFQPrinted-part acceptance sheet2 pages
Datums, as-built vs HIP density note, machining stock, FAI photos.
- RFQLanded-cost split sheet1 page
Piece, HIP NRE, inspection, packing, freight, duties.
Send one powder or 316L bracket brief we can circulate
Name the product, drawing or powder spec, quantity, US destination, and the exclusions you want listed. We circulate that pack so factories can return wholesale quotations. Unconfirmed capacity and unused HIP furnaces stay off the sheet until a named site writes them.
- Virgin versus reuse written as a 316L powder rule, not a slogan
- Optional budget merged into the existing requirement field
- High-end, mid-range, or economy recorded as preference only