17-4 PH Stainless Steel Bar Suppliers
154 vetted U.S. suppliers · 28 states
17-4 PH is the precipitation-hardened stainless of choice for shafts, valves, pump components, and aerospace fittings where high strength + corrosion resistance both matter. Below is our live count of vetted U.S. suppliers, with state distribution and a one-click RFQ flow.
Geographic distribution
Where these suppliers are
Top 8 states by vetted-supplier density. 50 more across 20 additional states — listed below the chart.
Also covered
North Carolina (7) · Michigan (7) · New Jersey (6) · Washington (4) · Georgia (4) · Arizona (3) · Minnesota (3) · Massachusetts (3) · New Hampshire (2) · Louisiana (1) · Virginia (1) · Mississippi (1) · South Carolina (1) · Kansas (1) · Missouri (1) · Wisconsin (1) · Utah (1) · Indiana (1) · Iowa (1) · Oklahoma (1)
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What 17-4 PH stainless steel bar is
17-4 PH (UNS S17400) is a martensitic precipitation-hardenable stainless steel — 17% chromium, 4% nickel, copper-strengthened. Strength is set by aging treatment: H900 (highest strength, lowest toughness) through H1150 (lower strength, highest toughness). Bar is supplied solution-annealed (Condition A) for stock-form, then customer-aged after machining. Common forms: round, square, hex bar from 0.25" through 12" diameter. ASTM A564 covers the bar spec.
What to look for in a supplier
Decide whether you want as-shipped Condition A (most common — buyer ages after machining) or pre-aged to a specific H-condition. Most stocking distributors ship Condition A and call out the customer's heat-treat shop separately; AMS-spec aerospace work usually needs the supplier or a qualified subcontractor to deliver to a specific aged condition with cert. Ask about diameter tolerance — 17-4 is precision-ground for shafting applications, but mill-finished hot-rolled bar is fine for general work. Lead times on uncommon diameters can be long since 17-4 isn't carried by every general-line stockist.
FAQ
Common questions
What's the difference between 17-4 PH and 15-5 PH?
15-5 PH is a refined version with no delta ferrite — slightly better transverse toughness and through-thickness uniformity. For most general applications 17-4 is fine; aerospace and high-cycle fatigue applications often spec 15-5. Mechanical properties are very similar.
What's the difference between H900, H1025, and H1150 conditions?
H900 (aged at 900°F) is the highest strength (~190 ksi tensile) and lowest toughness — used for tooling and high-load static parts. H1025 (~155 ksi) is the most common balance for machinery components. H1150 (~135 ksi) gives the best toughness and is preferred for impact-loaded or low-temperature service.
Is 17-4 PH bar magnetic?
Yes — 17-4 is martensitic (unlike 304/316 which are austenitic and non-magnetic). This catches people off guard; if your application requires non-magnetic stainless, you need a different grade.
Can 17-4 PH be welded?
Yes, but it requires post-weld heat treatment (re-solution and re-age) to restore properties in the heat-affected zone. For non-critical welds where strength can drop locally, weld and use. For load-bearing welded assemblies, plan on the heat-treat step.
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