The practical points
Condition A is solution-treated and commonly purchased for later aging.
H900 through H1150 conditions represent different aging schedules and property ranges.
Specify condition, hardness or mechanical requirements, and governing specification together.
“17-4” is not a complete condition
17-4 PH / UNS S17400 can be supplied solution treated or in multiple precipitation-hardened conditions. The condition changes hardness and mechanical behavior and can change the machining and downstream processing plan. The order must align the product specification, revision, condition, required properties, heat-treatment responsibility, dimensions, and documents.
| Buying route | Questions to resolve |
|---|---|
| Condition A bar; age after machining | Is Condition A permitted for the application? Who performs aging? What stock allowance, distortion plan, testing, traceability, and final certification are required? |
| Buy an aged condition | Which H-condition and property range? Does the supplied condition fit machining, finish, straightness, and final-part requirements? |
| Customer-specific heat-treatment route | What specification/revision, process approval, test coupon, lot definition, furnace record, and document package are required? |
Cross-check the paperwork
- The PO and accepted quote name the same alloy, product specification, revision, condition, size, and document flow-down.
- The order acknowledgement carries the accepted requirement and any approved change.
- The MTR and heat-treatment evidence identify the delivered heat/lot and report the properties required by the order.
- Physical tags and receiving records preserve the link to the shipped material.
Grade-specific position: Exact Bar’s 17-4 differentiation is condition, hardness, dimensional route, and document consistency—not a proprietary chemistry-band promise.
Related: 17-4 PH round bar, round-bar MTR review, and the incoming inspection checklist.
Put it on the purchase description
If diameter tolerance, straightness, roundness, surface finish, hardness, chemistry, origin, or documentation can affect acceptance or machining performance, state it explicitly. A familiar grade name is not a complete purchasing specification.
Reviewed by the Exact Bar technical sourcing team. Last reviewed August 17, 2026. The review checks primary sources, separates grade-specific claims from general guidance, and identifies what still requires machine, print, source, or lot validation. This is procurement guidance—not permission to substitute material or bypass the drawing, purchase order, accepted quote, order acknowledgement, incorporated specifications, or machine-specific validation.