S17400 (17-4PH / UNS S17400) – Comprehensive Technical Overview from ZYTC Alloy
When precision meets performance, S17400 stands as the benchmark. ZYTC Alloy has just completed a successful export order of S17400 Stainless Steel Sheet to South Korea – specification 0.2 × 300(+12) × 300 mm, cold-rolled, produced to ASTM A693-24. This is not just another shipment; it is a testament to ZYTC Alloy's mastery of one of the most reliable precipitation hardening stainless steels in the industry. Our S17400 is trusted across multiple countries and continues to set the standard for quality and performance.
S17400, also widely known as 17-4PH and designated as UNS S17400 (AISI Grade 630), is a martensitic precipitation hardening stainless steel that delivers an outstanding combination of high strength, good corrosion resistance, and excellent toughness. What sets S17400 apart is its ability to maintain high strength up to approximately 600°F (316°C). The alloy is martensitic in structure in the annealed condition and is further strengthened through a simple, low-temperature heat treatment that precipitates a copper-containing phase. This one-step process – conducted between 900°F (482°C) and 1150°F (621°C) – allows for a wide range of mechanical properties depending on the combination of strength and toughness desired. As a result, S17400 is one of the most versatile materials in the precipitation hardening family.
Chemical Composition of S17400 (UNS S17400)
The carefully balanced chemistry of S17400 is what gives it its remarkable properties. Below is the typical and specification composition range for S17400:
The chromium-nickel-copper composition of S17400 provides exceptional corrosion resistance, comparable to Type 304 stainless steel in most media, while outperforming the standard hardenable 400 series stainless steels. This makes S17400 the material of choice for applications where both strength and corrosion resistance are critical.
Mechanical Properties of S17400
The mechanical performance of S17400 can be tailored through various heat treatment conditions. The table below summarizes typical mechanical properties for S17400 across different heat treatment conditions (Condition A – solution annealed; H900, H1025, H1075, H1150 – precipitation hardened):
| Condition | Heat Treatment | 0.2% YS (ksi / MPa) | UTS (ksi / MPa) | Elongation (%) | Hardness (Rc) |
|---|---|---|---|---|---|
| A (Annealed) | 1900°F (1038°C), air cool | 145 / 1000 | 160 / 1103 | – | – |
| H900 | 900°F (482°C), 1 hr, air | 200 / 1379 | 210 / 1448 | 15 | 44 |
| H1025 | 1025°F (551°C), 4 hrs, air | 170 / 1172 | 185 / 1276 | 16 | 38 |
| H1075 | 1075°F (580°C), 4 hrs, air | 164 / 1131 | 175 / 1207 | 17 | 36 |
| H1150 | 1150°F (621°C), 4 hrs, air | 144 / 993 | 160 / 1103 | 20 | 33 |
These properties make S17400 ideal for high-strength, high-toughness, and fatigue-resistant applications. The ability to fine-tune mechanical properties through heat treatment gives engineers and designers exceptional flexibility when specifying S17400 for their projects.
Applications of S17400
S17400 is one of the most widely used precipitation hardening stainless steels across a diverse range of industries. Key application areas include:
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Turbine Manufacturing – turbine blades and engine components
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Chemical Processing – valves, pumps, and processing equipment
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Petrochemical & Oil & Gas – production equipment, helicopter decks, and offshore structures
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Food Processing – processing equipment and paper mill machinery
ZYTC Alloy's S17400 is available in multiple product forms including sheet, strip, wire, bar, Pipe, tube, forgings, and custom profiles. We also offer drawing-based custom machining services, strictly adhering to all S17400 specifications.
S17400 vs. S15500 – What's the Difference?
While both S17400 and S15500 belong to the precipitation hardening stainless steel family and are martensitic in structure, they differ significantly in composition and performance characteristics:
| Feature | S17400 (17-4PH) | S15500 (15-5PH) |
|---|---|---|
| Chromium Content | 15.00 – 17.50% | 14.00 – 15.50% |
| Nickel Content | 3.00 – 5.00% | 3.50 – 5.50% |
| Copper Content | 3.00 – 5.00% | 2.50 – 4.50% |
| Columbium + Tantalum | 0.15 – 0.45% | 0.15 – 0.45% |
| Key Advantage | Higher strength in H900 condition | Better toughness and transverse ductility |
| Corrosion Resistance | Comparable to Type 304 | Slightly superior in certain media |
| Typical Use | General high-strength applications | Aerospace and critical structural components requiring higher toughness |
S15500 (also known as 15-5PH) was developed as a modification of S17400 to provide improved toughness and better forgeability, particularly in the transverse direction. However, S17400 remains the more widely used and versatile alloy due to its excellent combination of strength, corrosion resistance, and cost-effectiveness. For applications where maximum strength is the primary requirement, S17400 in the H900 condition delivers superior performance compared to S15500.
ZYTC Alloy – Your Trusted S17400 Partner
S17400 is one of ZYTC Alloy's most mature materials. With years of experience and exports to multiple countries, we have perfected the production of S17400 in all forms. Our recent S17400 shipment to South Korea – produced to ASTM A693-24 – is a prime example of our capability and commitment to quality.
What ZYTC Alloy Offers for S17400:
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Full Product Range – S17400 sheet, strip, wire, bar, pipe, tube, forgings, and related products
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Standard Compliance – Strict adherence to ASTM A693-24, AMS 5604, AMS 5643, ASTM A564, ASTM A705, and other relevant specifications
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Cold-Rolled Delivery – Precision cold-rolled S17400 sheet and strip
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Custom Processing – Drawing-based machining and custom fabrication to your specifications
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Fast Delivery – Competitive lead times without compromising quality
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Competitive Pricing – High-quality S17400 at reasonable prices
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Global Experience – Trusted by customers across multiple countries
Whether you need S17400 for medical devices, turbine manufacturing, aerospace components, or any other demanding application, ZYTC Alloy has the expertise and capacity to deliver. Contact us today to discuss your S17400 requirements.
