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Model No: 17-4PH H900
17-4PH H900 / UNS S17400 / SUS 630
Lork Group is a leading exporter & stockist of high-strength 17-4PH H900 (UNS S17400, SUS 630). Get premium quality, fast delivery, and request a free sample & quote today.
Delivery :
FOB
minimum order :
50 kilograms
Supply Ability :
5000Tonkilograms / Month
Stock Time :
7-10Day
Country of Origin :
CHINA
Quantity :
Lork Group available upon request: 17-4PH (H900, UNS S17400) in sheet, sheet coil, plate, round bar, processed flat bar and tubular products. Get competitive pricing, fast global shipping, and request your free sample today!
17-4PH H900 is a chromium-copper precipitation hardening stainless steel that is used for applications requiring high strength and a moderate level of corrosion resistance. It is one of the most widely used precipitation hardening grades, as it has high strength hardness up to about 572°F while demonstrating good corrosion resistance in all heat treated conditions.
SUS 630 can be heat treated to a variety of temperatures to develop a wide range of properties. Its mechanical properties can be optimized with heat treatment where very high yield strength up to 180 ksi can be achieved. UNS S17400 should not be used at temperatures above 572°F or at very low temperatures.
Chemical Properties
| TYPE | Cr | Ni | Cu | Cb + Ta | C | Mn | P | S | Si |
|---|---|---|---|---|---|---|---|---|---|
| 17-4 (H900) | min: 15.0 max: 17.5 | min: 3.0 max: 5.0 | min: 3.0 max: 5.0 | min: 0.15 max: 0.45 | 0.07 max | 1.00 max | 0.04 max | 0.03 max | 1.00 max |
Mechanical Properties
| Hardening or Precipitation Treatment at 900°F | ||||||
|---|---|---|---|---|---|---|
| Thickness, inches | Ultimate Tensile Strength, ksi min. | 0.2% Yield Strength, ksi min. | Elongation % in 2″ min. | Reduction in Area min. % | Hardness, Rockwell, min. / max | Hardness, Brinell, min. / max. |
| Under 0.1875″ | 190 | 170 | 5 | — | C40 – C48 | — |
| 0.1875″ to 0.625″ | 190 | 170 | 8 | 25 | C40 – C48 | 388 / 477 |
| 0.625″ to 4.0″ | 190 | 170 | 10 | 30 | C40 – C48 | 388 / 477 |
| Hardening or Aging Treatment at 900°F | ||||||
|---|---|---|---|---|---|---|
| Thickness, inches | Ultimate Tensile Strength, ksi min. | 0.2% Yield Strength, ksi min. | Elongation % in 2″ min. | Reduction in Area min. % | Hardness, Rockwell, min. / max | Hardness, Brinell, min. / max. |
| Up to 3.0 in. incl. | 190 | 170 | 10 | 40 | 40 | 388 |
| Over 3.0 in. to 8.0 in. incl. | 190 | 170 | 8 | 35 | 40 | 388 |
Physical Properties
| Heat Treated Condition | H900 |
|---|---|
| Thermal Conductivity, BTU/hr/ft2/in/°F | |
| Mean Coefficient of Thermal Expansion, in/in/°F | |
| 70 – 900°F | — |
| Specific Heat, BTU/lb/°F (32-212°F) | 0.1 |
| Poisson’s Ratio (all conditions) | 0.272 |
| Density, lbs/in3 | 0.282 |
| -100 to 70°F | 5.8 x 10^-6 |
| 70 – 200°F | 6.0 x 10^-6 |
| 70 – 400°F | 6.0 x 10^-6 |
| 70 – 600°F | 6.3 x 10^-6 |
| 70 – 800°F | 6.5 x 10^-6 |
| Modulus of Rigidity, ksi | 11.2 x 10^3 |
| Modulus of Elasticity, ksi | 28.5 x 10^3 |
| Electrical Resistivity, microhm-cm | 77 |
| 300°F | 124 |
| 500°F | 135 |
| 860°F | 156 |
| 900°F | 157 |
Applications
Alloy 17-4 is commonly used for applications requiring high strength and a moderate level of corrosion resistance. Some applications that frequently use Alloy 17-4 include:
- Aircraft
- Nuclear waste casks
- Paper mills
- Oil fields
- Mechanical components
- Chemical process components
- Food industry
- Aerospace
Weldability
- Successfully welded by most common fusion and resistance methods.
- Should not be joined by oxyacetylene welding.
- Generally no pre-heating required.
- Inter-pass temperature must be limited to 248°F.
- Better toughness is obtained in the weld after a complete heat treatment.
Elevated Temperature Use
- Excellent resistance to oxidation to approximately 1100°F.
- Long-term exposure to elevated temperature can result in reduced toughness in the precipitation hardened conditions.
Processing – Hot Forming
- To forge, heat uniformly to 2150 / 2200°F and hold for half hour per inch.
- Preferred temperature range for hot forming is at 650-900°F, while the steel is still austenitic.
- To ensure the best condition for the hardening operations, the forgings must be re-heat treated at 1875-1925°F.
- Cool forgings to below 90°F to ensure grain refinement.
Processing – Cold Forming
- Alloy 17-4 is limited to mild operations since in the annealed (solution treated) condition the material is hard.
- For severe cold working the material should be heat treated to condition H1150. This will help prevent possible cracking.
- Bend radius in excess of 7T is often required.
- To improve stress corrosion resistance after cold forming, re-aging at the precipitation-hardening temperature is recommended.
Machinability
- Can be machined in both solution-treated and precipitation-hardening conditions.
Lork Group is a premier international exporter and dedicated stockist of high-performance 17-4PH H900 precipitation-hardening stainless steel. Also known as UNS S17400 and SUS 630, this grade is renowned for its exceptional combination of high strength, good corrosion resistance, and mechanical properties maintained at elevated temperatures.
We maintain a rich inventory of 17-4PH H900 in various forms, including wire, bar, and strip, ready for immediate shipment to meet your critical project deadlines and production schedules. This material is ideal for demanding applications in aerospace, defense, chemical processing, oil & gas, and high-stress mechanical components.
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