| Customization: | Available |
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| Type: | Alloy Steel Bar |
| Standard: | AISI, ASTM, GB, JIS, DIN |
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17-4PH(630) stainless is an age-hardening martensitic stainless combining high strength with the corrosion resistance of stainless steel. Hardening is achieved by a short-time, simple low-temperature treatment. Unlike conventional martensitic stainless steels, such as type 410, 17-4PH(630) is quite weldable. The strength, corrosion resistance and simplified fabrication can make 17-4 stainless a cost-effective replacement for high strength carbon steels as well as other stainless grades.
At the solution treating temperature, 1900°F, the metal is austenitic but undergoes transformation to a low-carbon martensitic structure during cooling to room temperature. This transformation is not complete until the temperature drops to 90°F. Subsequent heating to temperatures of 900-1150°F for one to four hours precipitation strengthens the alloy. This hardening treatment also tempers the martensitic structure, increasing ductility and toughness.
Chemical composition
The chemical composition of grade 17-4PH(630) stainless steel is outlined in the following table.
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The mechanical properties of grade 317L stainless steel are displayed in the following table.
| Material | Condition | Ultimate Tensile Strength (ksi) | 0.2 % Yield Strength (ksi) | Elongation % in 2D | % Reduction of Area | Rockwell C Hardness |
| Alloy 17-4PH Bar AMS 5643 |
Cond A | - | - | - | - | 363 HB max |
| Alloy 17-4PH Bar AMS 5643 |
H900 | 190 | 170 | 10 | 40 | 388-444 |
| Alloy 17-4PH Bar AMS 5643 |
H925 | 170 | 155 | 10 | 44 | 375-429 |
| Alloy 17-4PH Bar AMS 5643 |
H1025 | 155 | 145 | 12 | 45 | 331-401 |
| Alloy 17-4PH Bar AMS 5643 |
H1075 | 145 | 125 | 13 | 44 | 311-375 |
| Alloy 17-4PH Bar AMS 5643 |
H1100 | 140 | 115 | 14 | 45 | 302-363 |
| Alloy 17-4PH Bar AMS 5643 |
H1150 | 135 | 105 | 16 | 50 | 277-352 |
| Grade | UNS | DIN | EN | AMS | ASTM | JIS | |
| 17-4PH(630) |
UNS S17400 |
- | 1.4548 | AMS 5604 AMS 5643 AMS 5825 |
ASTM A564 |
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Technology
Stainless Steel 17-4PH reacts best to hot forming at 1742 to 2192 °F (950 to 1200 °C), with annealing at 76 °F (25 °C) and aging. The alloy can also be cold-formed in limited form, primarily to plates in the annealed condition. However, stress corrosion resistance can be improved with re-aging.
Furthermore, 17-4PH can be cut using mechanical operations, such as abrasive waterjets, machining, bandsaw, and shearing. However, plasma cutting isn't recommended on this alloy.
17-4PH has the best welding characteristics of competing stainless steel alloys. Moreover, it can be welded using all standard techniques, including gas tungsten arc, gas metal arc, shielded metal arc, and plasma arc. To achieve desired mechanical properties, pre-weld and post-weld heat treatments are recommended. For the best results, we recommend the AMS 5643 wire.
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