17-4 PH Stainless Steel Casting: Properties, Specs & Uses
17-4 PH stainless steel casting is the go-to choice for components that need both high strength and good corrosion resistance. At Uni Tritech, India’s NADCAP-certified foundry, we pour the cast grade CB7Cu-1 to net shape with full traceability.
This guide explains 17-4 PH stainless steel casting properties, the heat treatment it needs, and how it differs from 15-5 PH. See our investment casting process page and this precipitation hardening reference.
What Is 17-4 PH Stainless Steel Casting?
17-4 PH stainless steel casting produces parts from a martensitic stainless containing about 17% chromium, 4% nickel, and 4% copper. The cast designation is CB7Cu-1 (ASTM A747). 17-4 PH stainless steel casting balances strength, hardness, and corrosion resistance.
17-4 PH stainless steel casting delivers high-strength, corrosion-resistant precipitation hardening stainless parts. This guide covers 17-4PH heat treatment conditions, properties, and 17-4 PH vs 15-5 PH casting.
Precipitation Hardening Stainless Casting Explained
Precipitation hardening stainless casting develops strength through copper-rich precipitates formed during aging. This is why a precipitation hardening stainless casting can reach far higher strength than standard austenitic grades while keeping good corrosion resistance.
Why engineers specify 17-4 PH:
- High strength and hardness with a simple, low-distortion age.
- Good corrosion resistance, close to 304 stainless steel.
- Service temperatures up to roughly 300°C without losing strength.
- Near-net-shape casting reduces machining of this tough alloy.
- Strength tunable by aging condition to suit the application.
17-4PH Heat Treatment Conditions
The 17-4PH heat treatment conditions decide the final strength and toughness. Parts are solution treated, then aged at a chosen temperature. Lower aging temperatures give higher strength; higher temperatures give more toughness. Pick 17-4PH heat treatment conditions to match the load case.
Common 17-4PH aging conditions:
- H900: highest strength, near 1,310 MPa, hardness about 44 HRC.
- H1025: balanced strength and toughness for general parts.
- H1075: lower strength with improved ductility and impact.
- H1150: highest toughness, used for shock-loaded components.
- Condition A: solution treated only, machined before aging.
17-4 PH vs 15-5 PH Casting: How to Choose
In 17-4 PH vs 15-5 PH casting, both are copper-strengthened martensitic grades. The 17-4 PH vs 15-5 PH casting choice comes down to toughness: 15-5 PH (CB7Cu-2) has lower delta ferrite, giving better transverse toughness for thick sections.
- Choose 17-4 PH for general high-strength corrosion-resistant parts.
- Choose 15-5 PH where transverse toughness is critical.
- Both use similar aging conditions like H900 to H1150.
- Both cast cleanly to net shape using investment casting.
Why Choose Uni Tritech for 17-4 PH Stainless Steel Casting
Uni Tritech is a NADCAP-certified, AS9100D foundry. We deliver 17-4 PH stainless steel casting with in-house CNC machining, controlled heat treatment, and full non-destructive testing, and also cast Inconel 718 superalloys.
- In-house solution treatment and aging to any H-condition.
- NADCAP NDT: radiography, FPI, and ultrasonic testing.
- AS9102 first-article inspection with full CMM reports.
- One-stop casting, heat treatment, and machining in India.
Frequently Asked Questions
It depends on the load. H900 gives the highest strength, H1025 balances strength and toughness, and H1150 gives the most toughness. Choose 17-4PH heat treatment conditions to match service stresses.
Both are copper-strengthened martensitic stainless grades. 15-5 PH has lower delta ferrite for better transverse toughness, while 17-4 PH is the general-purpose high-strength choice.
Yes. 17-4 PH stainless steel casting offers corrosion resistance close to 304 stainless while delivering much higher strength after precipitation hardening.
It is used for valve and pump parts, aerospace fittings, shafts, gears, and marine components that need high strength with good corrosion resistance.
Yes. Uni Tritech exports NADCAP-certified 17-4 PH stainless steel casting to aerospace, defence, and industrial OEMs worldwide, with full traceability and AS9102 documentation.
Need 17-4 PH stainless steel casting for high-strength corrosion-resistant parts? Uni Tritech delivers NADCAP-certified, heat-treated castings with full traceability. Contact our team today.
Looking for a trusted 17-4 PH stainless steel casting manufacturer in India?
Uni Tritech casts high-strength precipitation hardening stainless components for aerospace, defence, and industrial use. Talk to us about your 17-4 PH castings today.
