17-4PH vs 316 Stainless Steel: Price, Strength, and Application Differences
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Are you comparing 17-4PH stainless steel versus 316 stainless steel for your next project and need a clear, data-driven decision guide?
Choosing the right stainless steel grade is critical for performance, cost control, and long-term reliability. While both 17-4PH and 316 are popular, they differ significantly in mechanical strength, corrosion resistance, cost structure, and application suitability.
What are the advantages of 316 stainless steel?
316 stainless steel's advantages are superior corrosion resistance (especially to chlorides/saltwater), excellent strength and durability, high-temperature performance, and biocompatibility, thanks to added molybdenum, making it ideal for marine, medical, chemical, and food processing environments where harsh conditions demand reliability and longevity. It's also easy to form, weld, and clean, with good recyclability.
What Are The Advantages Of 17-4PH stainless steel ?
17-4PH (EN 1.4542, UNS S17400) combines exceptional strength (peak-aged H900: tensile ≥ 1310 MPa, yield ≥ 1170 MPa), moderate corrosion resistance (PREN ≈ 24–30, comparable to 304 in many environments), and good toughness (elongation ≥ 10 %, impact energy up to 60 J in H1025 temper), along with machinability in solution-annealed states (hardness ~277 HB) and magnetic properties useful for specific applications, making it ideal for aerospace, medical, and high-stress industrial components where high strength-to-weight ratio and corrosion resistance are required.
17-4PH vs 316 Stainless Steel: chemical Composition
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CHEMICAL COMPOSITION |
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GRADES |
SS316 |
17-4PH |
| Carbon | 0.05 | 0.06 |
| Manganese | 2 | 0.9 |
| Phosphorous | 0.045 | 0.03 |
| Sulfur | 0.03 | 0.02 |
| Silicon | N/A | 0.9 |
| Copper, columbium, and Tantalum | N/A | 4 |
| Molybdenum | 2.1 | N/A |
| Nickel | 8 | 4 |
| Chromium | 18 | 17.5 |
*It can be clearly examined that chemical composition for the two grades are bit different in terms of molybdenum, copper, columbium, and Tantalum etc.
17-4PH vs 316 Stainless Steel: Mechanical Properties
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MECHANICAL PROPERTIES & STRENGTH |
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GRADES |
SS316 |
17-4PH |
| Tensile Strength Mpa | 545 | 1276 |
| Yield Strength Mpa | 275 | 1170 |
| Hardness (HB) | 220 | 350 |
| Elongation % | 50% | 8% |
17-4PH vs 316 Stainless Steel: Strength
17-4PH (peak aged H900) has a tensile strength of ≥ 1310 MPa and a yield strength of ≥ 1170 MPa, significantly higher than 316 stainless steel (tensile strength 515–620 MPa, yield strength ≥ 205 MPa). Its strength is approximately 2–2.5 times that of 316, making it suitable for high-stress structural components.
17-4PH vs 316 Stainless Steel: Corrosion Resistance
316 contains 2–3% Mo, with a PREN of approximately 24–26, offering superior resistance to pitting and crevice corrosion in chloride environments (such as seawater) compared to 17-4PH (PREN ≈ 24–30, but without Mo). 17-4PH performs slightly better in reducing acids (such as dilute sulfuric acid) due to copper microalloying, but overall, 316 has more comprehensive corrosion resistance.
17-4PH vs 316 Stainless Steel: Applications
17-4PH is used in high-strength applications such as aerospace components (landing gear, turbine shafts), surgical instruments, and high-performance valves; 316 is used in chemical containers, offshore platforms, food processing equipment, and other areas requiring corrosion resistance and good weldability.
17-4PH vs 316 Stainless Steel: Price
The raw material cost of 17-4PH is approximately 15–25% higher than 316 (due to the inclusion of Cu and complex heat treatment), but due to its higher strength, the cross-sectional dimensions can be reduced, potentially resulting in similar overall costs in some applications; 316 is more widely available, with less price fluctuation (approximately $3000–$4000/ton), while 17-4PH is approximately $3800–$5000/ton (depending on condition and specifications).
GNEE is a trusted supplier of precipitation-hardening stainless steel and specialty alloys in China. We supply 17-4 PH, 15-5 PH, and 17-7 PH alloys in various forms including bars, plates, profiles, and forgings. All products are sourced from certified steel mills and undergo rigorous chemical composition and mechanical property testing to ensure reliable quality.Email: info@gneestainless.com
Whether you are in the aerospace, oil and gas, marine engineering, or defense industry, we ensure that every batch of our products meets international standards and your specific application requirements.
Click here to view our complete range of precipitation-hardening alloys: PH Alloys.
