Key Features of 17-4PH Stainless Steel
At vastmaterial, we recognize that 17-4PH stainless steel is the definitive choice for applications requiring a precise balance of high strength and moderate corrosion resistance. Also known as Type 630, this martensitic PH stainless grade is the undisputed workhorse of the precipitation hardening stainless family. We stock this alloy because it effectively solves the trade-off between durability and structural integrity that engineers often face.
Here is why 17-4PH stands out in the market:
- Exceptional Strength: Through simple low-temperature heat treatments, this alloy achieves high tensile strength and hardness levels that standard austenitic grades cannot match.
- Korozyon Direnci: It significantly outperforms standard hardenable stainless steels (like 410) and rivals 304 stainless in most environments.
- Heat Handling Capabilities: The material maintains excellent mechanical properties and oxidation resistance up to approximately 600°F (316°C).
- Processing Versatility: It can be machined in the solution-annealed condition and then hardened to meet specific design requirements, minimizing distortion.
Neden Önemlidir
| Özellik | Fayda |
|---|---|
| Yüksek Dayanıklılık | Ideal for heavy-duty aerospace and structural components. |
| Korozyon Direnci | Suitable for chemical processing and marine environments. |
| Simple Heat Treatment | Allows for adjustable strength levels (e.g., H900, H1150). |
Would you like me to detail the specific chemical composition breakdown next?
Equivalent Grades and Standards
When sourcing materials for critical projects, matching the exact specification on your blueprint is non-negotiable. While most of us in the industry simply call it 17-4PH, you will often see it listed under various designations depending on the governing body or location. At vastmaterial, we ensure our inventory meets these rigorous global standards to keep your supply chain running smoothly.
In the United States, the most common call-outs are UNS S17400 ve AISI 630 (or Type 630 stainless). For our aerospace clients, we strictly adhere to AMS 5643, which dictates tighter controls for bars, forgings, and rings.
Here is a quick breakdown of how 17-4 PH steel translates across international standards:
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|---|---|
| cURL Too many subrequests. | UNS S17400 |
| cURL Too many subrequests. | Type 630 |
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| cURL Too many subrequests. | AMS 5643 |
| cURL Too many subrequests. | 1.4542 cURL Too many subrequests. |
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| Element | cURL Too many subrequests. | cURL Too many subrequests. |
|---|---|---|
| Krom (Cr) | cURL Too many subrequests. | cURL Too many subrequests. |
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| Karbon (C) | 0.07 max | Kept low to maintain toughness and weldability. |
Key Takeaways on Chemistry:
- Balance is Key: The specific ratio of Chrome to Nickel gives it the corrosion resistance of 304 but the strength of 410.
- Trace Control: We keep Sulfur (S) and Phosphorus (P) extremely low to ensure the material remains clean and machinable.
- Stabilization: The inclusion of Niobium (Columbium) helps stabilize the carbides, making this an excellent choice for parts requiring high reliability.
We don’t just mix metal; we engineer it. By maintaining tight control over this composition, we guarantee that every bar or plate meets the rigorous demands of aerospace and industrial applications.
Would you like me to detail the mechanical properties and strength data for H900 and H1150 conditions next?
17-4PH Mechanical Properties and Strength Data
cURL Too many subrequests. 17-4PH mechanical properties, we are looking at one of the most versatile datasets in the stainless world. The real magic of UNS S17400 (Type 630) lies in its ability to be heat-treated to a wide range of strength levels. Unlike standard austenitic grades that rely solely on cold working for strength, we can dial in the specific hardness and tensile specs you need through simple precipitation hardening.
Whether you need the brute force of the H900 condition or the improved ductility of H1150, understanding these numbers is critical for application success. Below is a breakdown of the typical strength capabilities we see in our stock material, compliant with cURL Too many subrequests..
Typical Mechanical Specs by Condition
We supply 17-4PH in the Solution Annealed (Condition A) state, but most of our US clients machine it and then age it to one of the following conditions.
| Koşul | Tensile Strength (min) | Yield Strength (0.2% Offset) | Elongation | Hardness (Rockwell C) |
|---|---|---|---|---|
| Condition A (Annealed) | ~ 150 ksi (1035 MPa) | ~ 110 ksi (760 MPa) | – | ~ 30-33 HRC |
| H900 Condition | 190 ksi (1310 MPa) | 170 ksi (1170 MPa) | 10% | 40-47 HRC |
| H1025 Condition | 155 ksi (1070 MPa) | 145 ksi (1000 MPa) | 12% | 35-42 HRC |
| H1150 Heat Treatment | 135 ksi (930 MPa) | 105 ksi (725 MPa) | 16% | cURL Too many subrequests. |
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| Koşul | Sıcaklık | cURL Too many subrequests. | Key Characteristic |
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| cURL Too many subrequests. | cURL Too many subrequests. | cURL Too many subrequests. | Balanced Properties |
| H1150 | 1150°F | cURL Too many subrequests. | Max Toughness & Ductility |
By controlling these variables, we ensure that the 17-4PH stainless steel you receive is perfectly tuned for its specific environment, whether that’s an aircraft engine or an offshore rig.
Physical Properties of 17-4PH Stainless Steel
When selecting a material like 17-4PH stainless steel, looking beyond just yield strength is critical. The physical characteristics of UNS S17400 often dictate whether the material can withstand specific environmental stresses like heat cycles or magnetic fields. Because this is a martensitic PH stainless, it behaves quite differently than the common 300-series austenitic grades you might be used to.
Magnetic Permeability
One of the most frequent questions we field is about magnetism. Unlike Type 304, Type 630 stainless is ferromagnetic. This means 17-4PH is magnetic in all heat-treated conditions (including annealed and hardened states). This property is vital if you are designing for magnetic sorting systems or need to avoid interference with sensitive instrumentation. For a deeper dive into this behavior, understanding whether 17-4 stainless steel is magnetic is essential for precision applications.
Density and Modulus
For weight calculations in aerospace and machinery, relying on accurate data is non-negotiable.
- Yoğunluk: 0.280 lb/in³ (7.75 g/cm³)
- Modulus of Elasticity: 28.5 x 10⁶ psi (196 GPa) in tension.
Thermal Properties
17-4PH offers decent thermal conductivity, but like most stainless steels, it is lower than carbon steel. If your parts will be exposed to fluctuating temperatures, you must account for thermal expansion to prevent seizing or warping.
Key Physical Data Points:
| Özellik | Value (Approx) |
|---|---|
| cURL Too many subrequests. | 2560°F – 2625°F (1404°C – 1440°C) |
| Specific Heat | 0.11 BTU/lb-°F (0.46 kJ/kg-°K) |
| cURL Too many subrequests. | 124 BTU-in/hr-ft²-°F (at 300°F) |
| Electrical Resistivity | 800 nΩ·m (Annealed) |
Would you like me to outline the specific stock options and forms available at vastmaterial next?
Available Forms of 17-4PH at vastmaterial
At vastmaterial, we understand that sourcing aerospace grade steel requires flexibility and reliability. We don’t just list products; we maintain a robust inventory of 17-4PH stainless steel cURL Too many subrequests.
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İşleme 17-4PH cURL Too many subrequests. cURL Too many subrequests. cURL Too many subrequests. cURL Too many subrequests. condition. In this overaged state, the material behaves similarly to 304 stainless but with better chip control.
- Coolant is Key: Always use a high-quality lubricant or coolant to manage heat and prevent work hardening.
- Tooling: Use carbide tools with positive rake angles to cut cleanly through the tough structure.
- Speed Control: Keep speeds moderate and feeds consistent. Dwelling in the cut will cause the material to glaze and harden instantly.
Welding and Forming
One of the standout features of cURL Too many subrequests. is its excellent weldability. Unlike many martensitic stainless steels, it does not typically require preheating before welding.
- Welding: It handles Shielded Metal Arc Welding (SMAW) and Gas Tungsten Arc Welding (GTAW) effectively. We suggest using a matching filler metal to maintain the mechanical properties across the weld zone.
- Forming: Cold forming should be done in Condition A. However, be prepared for significant springback due to the alloy’s high yield strength. For complex shapes, hot forming between 1742°F and 2192°F (950°C and 1200°C) is often the better route.
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Do you need specific speed and feed charts for your CNC setup or advice on post-weld heat treatment? Let me know, and I can provide detailed parameters for your machine shop.
Corrosion Resistance: 17-4PH vs. 304 and 410
One of the biggest selling points of 17-4PH stainless steel is that it doesn’t force you to choose between raw strength and longevity. In the steel business, we usually see a trade-off: as you harden stainless steel (like standard martensitic grades), you typically sacrifice corrosion resistance. 17-4PH (UNS S17400) disrupts that rule, giving you the durability needed for harsh industrial environments without rotting away.
How It Stacks Up Against the Standards
We frequently replace standard grades with 17-4PH when customers face premature failure in the field. Here is how it compares to the two most common alternatives:
- Vs. 410 Stainless: Type 410 is a standard martensitic grade known for hardness. However, in humid atmospheres or mild chemical environments, 410 tends to rust relatively quickly. 17-4PH offers vastly superior resistance compared to 410. It is the clear winner for components like pump shafts or valve stems that need to survive moisture.
- Vs. 304 Stainless: Type 304 is the “kitchen sink” standard for corrosion resistance. In most mild environments, 17-4PH stands toe-to-toe with Type 304. The major difference is mechanical: while 304 yields easily under high stress, 17-4PH maintains structural integrity.
For projects involving extreme saltwater exposure or highly aggressive chloride environments where even precipitation-hardening grades might be pushed to their limit, you might consider stepping up to dupleks paslanmaz çelik for maximum pitting resistance. However, for most high-strength aerospace and oil & gas applications, 17-4PH is the sweet spot.
Performance at a Glance
| Özellik | 410 Stainless | 304 Paslanmaz | 17-4PH (Type 630) |
|---|---|---|---|
| Korozyon Direnci | Low (Basic) | High (Standard) | cURL Too many subrequests. |
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Quality Assurance and Certifications
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- Competitive Economics: We offer mill-direct pricing without the hassle, keeping your material costs down without sacrificing quality.
- Certified Quality: All material meets AMS 5643 ve cURL Too many subrequests. standards with full traceability.
cURL Too many subrequests. Would you like a rapid quote for a specific size or condition of 17-4PH today?
Frequently Asked Questions About 17-4PH Stainless Steel
At vastmaterial, we handle inquiries about 17-4PH daily. Whether you are an engineer specifying materials for an aerospace project or a machinist trying to figure out the best feed rate, getting the details right matters. Here are the answers to the most common questions we receive.
What is the difference between H900 and H1150 conditions?
This is the most frequent question we get regarding ısıtma işlemi. The difference lies in the trade-off between strength and ductility (toughness) based on the aging temperature.
- cURL Too many subrequests. The material is aged at 900°F. This produces the maximum tensile strength and hardness but offers the lowest ductility. It is brittle compared to other conditions.
- cURL Too many subrequests. The material is aged at 1150°F. This reduces the strength slightly but significantly increases the impact toughness and ductility.
Quick Comparison:
| Özellik | H900 Condition | H1150 Condition |
|---|---|---|
| Dayanıklılık | Ultra-High | Moderate-High |
| Toughness | Düşük | Yüksek |
| Uygulama | Gears, Aircraft Structures | Valve Stems, Heavy Shafting |
Is 17-4PH difficult to machine?
17-4PH stainless steel is generally machineable, but the condition of the material dictates how easy the job will be. In the annealed state (Condition A), it behaves similarly to Type 304, though it can be somewhat “gummy” and tough on tools.
For the best surface finish, many of our US clients prefer machining material that has already undergone the cURL Too many subrequests.. It breaks chips better than the annealed condition. If you need complex shapes created with high precision, our investment casting steel alloy services can often reduce the need for extensive machining by delivering near-net-shape parts right out of the gate.
How does 17-4PH hold up in seawater?
UNS S17400 offers excellent corrosion resistance, generally superior to the 400-series hardenable stainless steels and comparable to Type 304 in most environments.
- Flowing Seawater: It performs very well and is a standard choice for marine propeller shafts.
- Stagnant Water: Like many stainless grades, it can be susceptible to pitting or crevice corrosion if left in stagnant seawater for long periods.
Is 17-4PH magnetic?
Yes. Unlike the austenitic 300-series (like 304 or 316) which are non-magnetic, 17-4PH is martensitic. This means it is magnetic in all conditions cURL Too many subrequests.
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