A precipitation hardenable chromium-nickel-copper grade, Alloy 17-4 offers excellent corrosion resistance, high creep rupture strength and high tensile strength.
Most commonly used in the oil and gas, aerospace and motorsport markets, Alloy 17-4 offers excellent corrosion resistance, high creep rupture strength, high tensile strength and hardness.
We stock Alloy 17-4 in a variety of product forms to suit different applications and fabrication methods, including plate, round bar and sheet. To view available sizes and submit an inquiry, use the dropdown selector below.
| % | Ni | Cr | Mo | Mn | Cu | Si | C | Cb+Ta | S | P | Fe |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | 3 | 15 | - | - | 3 | - | - | 5 x c | - | - | - |
| Max | 5 | 17.5 | 0.05 | 1 | 4 | 1 | 0.07 | 0.45 | 0.03 | 0.04 | Balance |
Alloy 17-4 is an age-hardening martensitic stainless combining high strength with the corrosion resistance of stainless steel.
The alloy maintains high tensile strength and hardness up to 316°C and excellent oxidation resistance up to 593°C. Alloy 17-4 has good creep-stress rupture properties up to 482°C.
Hardening is achieved by a short-time, simple low-temperature treatments. Unlike conventional martensitic stainless steels, such as type 410, Alloy 17-4 is more weldable.
The strength, corrosion resistance and simplified fabrication can make Alloy 17-4 stainless a cost-effective replacement for high strength carbon steels as well as other stainless grades.
For more information on 17-4 Stainless, or to enquire about our inventory then please contact us, alternatively fill in our online quote form and we’ll get right back to you.
| Mechanical & Physical Properties | 21°C | 100°C | 200°C | 300°C |
|---|---|---|---|---|
| Coefficient of Thermal Expansion µm/m⁰C | 13 | 13.5 | 14 | |
| Thermal Conductivity/kcal/(hr.m.°C) | 12.8 | 13.7 | 14.6 | 15.5 |
| Modulus of Elasticity/ x105 MPa | 2 | 1.94 | 1.86 | 1.8 |
| H900 | H925 | H1025 | H1075 | H1100 | H1150 | H1150-M | |
|---|---|---|---|---|---|---|---|
| Ultimate Tensile Strength, ksi | 200 | 190 | 170 | 165 | 150 | 145 | 125 |
| 0.2% Yield Strength, ksi | 185 | 175 | 165 | 150 | 135 | 125 | 85 |
| Elongation % in 2″ or 4XD | 14 | 14 | 15 | 16 | 17 | 19 | 22 |
| Reduction of Area, % | 50 | 54 | 56 | 58 | 58 | 60 | 68 |
| Hardness, Brinell (Rockwell) | 420 (C44) | 409 (C42) | 352 (C38) | 341 (C35) | 332 (C35) | 311 (C33) | 277 (C27) |
| Impact Charpy V-Notch, ft – lbs | 15 | 25 | 35 | 40 | 25 | 30 | 100 |
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