ATI 17-4™ / ATI 17-4-MIL™ Precipitation Hardening Stainless Steel
UNS S17400
ATI 17-4™ precipitation hardening stainless steel (S17400), ATI 17-4 is a chromium-nickel-copper precipitation hardening stainless steel used for applications requiring high strength and a moderate level of corrosion resistance. High strength is maintained to approximately 600°F (316°C). This alloy is designated Grade or Type 630 in several specifications
The S17400 alloy is martensitic in structure in the annealed condition and is further strengthened by a low temperature treatment which precipitates a copper containing phase in the alloy. In comparison to many alloys in the precipitation hardening family, the S17400 alloy requires a simple heat treatment; a one step process conducted at a temperature in the range 900°F (482°C) to 1150°F (621°C) depending on the combination of strength and toughness desired. A wide range of properties can be produced by this one step heat treatment. Heat treatment in the 900°F (482°C) range produces highest strength. ATI produces ATI 17-4 in sheet, strip, and plate product forms. ATI 17-4 is produced in compliance with aerospace specifications such as AMS 5604 and standard industrial specifications such as ASTM A693 and ASME SA-693.
Product Documents
Documents
Product Specifications By Form
Bar
Composition
| Element | Minimum (weight %) | Maximum (weight %) | Typical (weight %) |
|---|
| Cr | | 16.3 | |
| Cu | | 4.0 | |
| Ni | | 4.0 | |
| Mn | | 0.5 | |
| Si | | 0.5 | |
| Cb | | 0.3 | |
| C | | 0.035 | |
| P | | 0.02 | |
| S | | 0.015 | |
Density
Tensile Strength
| ksi | MPa |
|---|
| 115 min - 190 (Hardened) max | 515 min - 1170 (Hardened) max |
Yield Strength
| ksi | MPa |
|---|
| 75 min - 170 (Hardened) max | 790 min - 1310 (Hardened) max |
Hardness
| 26-47 HRC (Hardened) typical |
Elongation
Specifications
ASTM A693, ASME SA-693, AMS 5604
Composition
| Element | Minimum (weight %) | Maximum (weight %) | Typical (weight %) |
|---|
| Cr | | 16.3 | |
| Cu | | 4.0 | |
| Ni | | 4.0 | |
| Mn | | 0.5 | |
| Si | | 0.5 | |
| Cb | | 0.3 | |
| C | | 0.035 | |
| P | | 0.02 | |
| S | | 0.015 | |
Density
Tensile Strength
| ksi | MPa |
|---|
| 115 min - 190 (Hardened) max | 515 min - 1170 (Hardened) max |
Yield Strength
| ksi | MPa |
|---|
| 75 min - 170 (Hardened) max | 790 min - 1310 (Hardened) max |
Hardness
| 26-47 HRC (Hardened) typical |
Elongation
Specifications
ASTM A693, ASME SA-693, AMS 5604
ATI 17-4™ is typically supplied in the solution annealed condition with a hardness maximum of 38 HRC. The properties shown below are for the H900 heat treated condition. Please refer to the data sheet for properties in other heat treated conditions.
Composition
| Element | Minimum (weight %) | Maximum (weight %) | Typical (weight %) |
|---|
| Cr | 15.0 | 17.5 | |
| Cu | 3.0 | 5.0 | |
| Ni | 3.0 | 5.0 | |
| Si | | 1.00 | |
| Mn | | 1.00 | |
| Cb | 0.15 | 0.45 | |
| C | | 0.07 | |
| P | | 0.040 | |
| S | | 0.030 | |
| Fe | Balance | | |
Density
Tensile Strength
Yield Strength
Hardness
Elongation
Specifications
ASTM A693, ASME SA-693, AMS 5604
ATI 17-4™ is typically supplied in the solution annealed condition with a hardness maximum of 38 HRC. The properties shown below are for the H900 heat treated condition. Please refer to the data sheet for properties in other heat treated conditions.
Composition
| Element | Minimum (weight %) | Maximum (weight %) | Typical (weight %) |
|---|
| Cr | 15.0 | 17.5 | |
| Cu | 3.0 | 5.0 | |
| Ni | 3.0 | 5.0 | |
| Si | | 1.00 | |
| Mn | | 1.00 | |
| Cb | 0.15 | 0.45 | |
| C | | 0.07 | |
| P | | 0.040 | |
| S | | 0.030 | |
| Fe | Balance | | |
Density
Tensile Strength
Yield Strength
Hardness
Elongation
Specifications
ASTM A693, ASME SA-693, AMS 5604
ATI 17-4™ is typically supplied in the solution annealed condition with a hardness maximum of 38 HRC. The properties shown below are for the H900 heat treated condition. Please refer to the data sheet for properties in other heat treated conditions.
Composition
| Element | Minimum (weight %) | Maximum (weight %) | Typical (weight %) |
|---|
| Cr | 15.0 | 17.5 | |
| Cu | 3.0 | 5.0 | |
| Ni | 3.0 | 5.0 | |
| Si | | 1.00 | |
| Mn | | 1.00 | |
| Cb | 0.15 | 0.45 | |
| C | | 0.07 | |
| P | | 0.040 | |
| S | | 0.030 | |
| Fe | Balance | | |
Density
Tensile Strength
Yield Strength
Hardness
Elongation
Specifications
ASTM A693, ASME SA-693, AMS 5604
Contact
Contact
