17-4PH
17-4 PH is a precipitation-hardening stainless steel with a martensitic structure. It offers a remarkable combination of high strength, hardness, and corrosion resistance. This versatile material possesses favorable fabricating properties and can be efficiently age hardened through a single-step, low-temperature treatment. As a result, 17-4 PH finds extensive use in industries such as aerospace, chemical, petrochemical, food processing, paper, and general metalworking.
Chemical Composition Limits
| Weight% | C | Si | Mn | P + S max | Cr | Ni | Cb + Ta | Cu |
| AMS 5643 | 0.07 | 1.0 max | 1.0 max | 0.04 P 0.03 S | 15.0 – 17.5 | 3.0 – 5.0 | 5 X C / 0.45 | 3.0 – 5.0 |
| AISI 630 | 0.07 | 1.0 max | 1.0 max | 0.04P 0.03 S | 15.0 – 17.5 | 3.0 -5.0 | 0.15 – 0.45 | 3.0 – 5.0 |
Mechanical Properties
| Material | Condition | Ultimate Tensile Strength (ksi) | 0.2 % Yield Strength (ksi) | Elongation % in 2D | % Reduction of Area | Rockwell C Hardness |
| Alloy 17-4 PH Bar AMS 5643 | Cond A | – | – | – | – | 363 HB max |
| Alloy 17-4 PH Bar AMS 5643 | H900 | 190 | 170 | 10 | 40 | 388-444 |
| Alloy 17-4 PH Bar AMS 5643 | H925 | 170 | 155 | 10 | 44 | 375-429 |
| Alloy 17-4 PH Bar AMS 5643 | H1025 | 155 | 145 | 12 | 45 | 331-401 |
| Alloy 17-4 PH Bar AMS 5643 | H1075 | 145 | 125 | 13 | 44 | 311-375 |
| Alloy 17-4 PH Bar AMS 5643 | H1100 | 140 | 115 | 14 | 45 | 302-363 |
| Alloy 17-4 PH Bar AMS 5643 | H1150 | 135 | 105 | 16 | 50 | 277-352 |
| Material | Condition | Ultimate Tensile Strength (ksi) | 0.2 % Yield Strength (ksi) | Elongation % in 2D (Values are for sheet <0.1874″ thick) | % Reduction of Area | Rockwell C Hardness |
| Alloy 17-4PH Sheet/Plate AMS 5604 | Cond A | – | – | – | – | 38 max |
| Alloy 17-4PH Sheet/Plate AMS 5604 | H900 | 190 | 170 | 5 | – | 40-47 |
| Alloy 17-4PH Sheet/Plate AMS 5604 | H925 | 170 | 155 | 5 | – | 38-45 |
| Alloy 17-4PH Sheet/Plate AMS 5604 | H1025 | 155 | 145 | 5 | – | 35-42 |
| Alloy 17-4PH Sheet/Plate AMS 5604 | H1075 | 145 | 125 | 5 | – | 33-39 |
| Alloy 17-4PH Sheet/Plate AMS 5604 | H1100 | 140 | 115 | 5 | – | 32-38 |
| Alloy 17-4PH Sheet/Plate AMS 5604 | H1150 | 135 | 105 | 8 | – | 28-37 |