17-4 PH stainless steel (UNS S17400) is a chromium-nickel-copper precipitation-hardening alloy prized for its high strength, hardness, and corrosion resistance. When heat treated, it develops remarkable mechanical properties suitable for demanding industries such as aerospace, medical, energy, and precision machining.
At Mozaic Precision Metals, we specialize in centerless grinding and precision finishing of 17-4 PH stainless in every heat treat condition, producing bar stock and components with exceptional straightness and micro finish quality.
All 17-4 Heat Treat Conditions Explained
Each heat treatment condition alters the hardness, strength, and toughness of the material. Below are all the 17-4 heat treat conditions and their uses.
| Condition | Heat Treatment Process | Hardness (Rc) | Typical Applications |
|---|---|---|---|
| Condition A (Annealed) | Solution treated at 1900°F, air cooled | 28–32 | Ideal for machining before final hardening |
| H900 | Aged at 900°F for 1 hr, air cooled | 44–47 | Maximum hardness and tensile strength |
| H925 | Aged at 925°F for 1 hr | 42–45 | Slightly improved ductility over H900 |
| H1025 | Aged at 1025°F for 4 hrs | 38–42 | Balanced strength and toughness |
| H1075 | Aged at 1075°F | 34–38 | Good corrosion resistance and grindability |
| H1100 | Aged at 1100°F | 31–35 | Common for aerospace and machining bars |
| H1150 | Aged at 1150°F for 4 hrs | 28–32 | Excellent toughness and machinability |
| H1150-M (Modified) | Double age: 1400°F + 1150°F | 26–30 | Improved resistance to stress-corrosion cracking |
| H1150-D (Double Aged) | Two 1150°F cycles of 4 hrs each | 28–30 | Stable structure for long service |
| H1150-DA (Double Aged Alternate) | 1400°F 2 hrs + 1150°F 4 hrs | 28–32 | High toughness and corrosion resistance |
Centerless Grinding of 17-4 Heat Treated Bar Stock
Heat treatment significantly impacts how 17-4 grinds.
Harder states (H900–H1025): Require slower feed rates and specific wheel compositions to avoid thermal damage.
Softer states (H1100–H1150): Offer smoother microfinishes and higher removal rates.
At Mozaic Precision Metals, we grind bars from 0.06″ to 8″ diameter and up to 24 feet long. Our in-house expertise ensures every lot meets tolerance, straightness, and finish requirements for Swiss machining and medical manufacturing.
Grinding Advantages:
Roundness and straightness within ±0.0005″
Surface finishes down to 8 Ra
Controlled dimensional stability for all heat treat states
Optional chamfering, polishing, and packaging solutions
Selecting the Right Heat Treat Condition
H900–H1025: Maximum strength for shafts, pins, and small parts
H1075–H1150: Balanced strength and corrosion resistance for general machining
H1150-M, H1150-DA: Best for marine, medical, or high-temperature environments
Swiss machine customers often prefer H1075 or H1100 17-4 bar for reliable cutting performance and reduced tool wear.
Why Choose Mozaic Precision Metals
With decades of combined grinding experience, Mozaic Precision Metals provides ISO-grade quality, consistent material tracking, and tight process control. We handle every 17-4 PH condition with precision — from sourcing to final inspection.
Our in-house systems ensure you get:
Certified material traceability
Custom packaging and marking
Quick turnaround and technical support
Heat Treated Bar Stock at Mozaic Precision Metals
17-4 heat treated stainless steel remains one of the most trusted materials for high-performance machining and corrosion-resistant applications. Whether you require precision ground bar stock or finished components, Mozaic Precision Metals ensures quality, consistency, and optimal grind performance across all conditions.