ATI 17-4™
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ATI 17-4™ Precipitation Hardening Stainless Steel (UNS S17400) INTRODUCTION ATI 17-4™ precipitation hardening stainless steel (S17400), Type 630, 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, although slightly less than that of alloys like S17700 or S15700. The latter precipitation hardening stainless steels generally require more steps to complete heat treatment. SPECIFICATIONS & CERTIFICATES The ATI 17-4™ precipitation hardening stainless steel (S17400) is covered by the following wrought product specifications. PRODUCT FORMS ATI 17-4™ precipitation hardening stainless steel is furnished as plate, sheet, strip and long products. In all forms, the material is furnished in the annealed condition. Allegheny Technologies Incorporated 1000 Six PPG Place Pittsburgh, PA 15222-5479 U.S.A. www.ATImetals.com Data are typical, are provided for informational purposes, and should not be construed as maximum or minimum values for specification or for final design, or for a particular use or application. The data may be revised anytime without notice. We make no representation or warranty as to its accuracy and assume no duty to update. Actual data on any particular product or material may vary from those shown herein. TM is trademark of and ® is registered trademark of ATI Properties, Inc. or its affiliated companies. ® The starburst logo is a registered trademark of ATI Properties, Inc. © 2014 ATI. All rights reserved.

$-ATI Element Typical Composition (Weight Percent) CORROSION RESISTANCE Tests have shown that the corrosion resistance of ATI 17-4™ precipitation hardening stainless steel is comparable to that of Type 304 stainless steel in most media. In general, the corrosion resistance of ATI 17-4™ alloy is superior to that of the hardenable 400 series stainless steels. As with other precipitation hardening stainless steels, ATI 17-4™ precipitation hardening stainless steel is more susceptible to stress corrosion cracking at peak strength. Consequently, in applications where chloride stress...

PHYSICAL PROPERTIES Allegheny Technologies Incorporated 1000 Six PPG Place Pittsburgh, PA 15222-5479 U.S.A. www.ATImetals.com Data are typical, are provided for informational purposes, and should not be construed as maximum or minimum values for specification or for final design, or for a particular use or application. The data may be revised anytime without notice. We make no representation or warranty as to its accuracy and assume no duty to update. Actual data on any particular product or material may vary from those shown herein. TM is trademark of and ® is registered trademark of ATI...

MECHANICAL PROPERTIES Allegheny Technologies Incorporated 1000 Six PPG Place Pittsburgh, PA 15222-5479 U.S.A. www.ATImetals.com Data are typical, are provided for informational purposes, and should not be construed as maximum or minimum values for specification or for final design, or for a particular use or application. The data may be revised anytime without notice. We make no representation or warranty as to its accuracy and assume no duty to update. Actual data on any particular product or material may vary from those shown herein. TM is trademark of and ® is registered trademark of ATI...

Technical Data Sheet HEAT TREATMENT SUMMARY OF HEAT TREATING ATI 17-4™ ALLOYMinimum Properties Specified in Aerospace Material Specification (AMS) 5604 Heat Treat to Produce Martensitic Structure The ATI 17-4™ precipitation hardening stainless steel is furnished in the annealed condition. This is also called the solution heat treated condition, or Condition A. Annealing is conducted by heat treating at approximately 1900°F (1040°C) to 1950°F (1065°C) and cooling to room temperature. In this condition, the material possesses a martensitic structure. As a martensitic structure, the Allegheny...

ATI 17-4™ alloy possesses a relatively high strength and hardness in the annealed condition. The strength and hardness of the material is generally somewhat lower in the H 1150 overaged condition. To develop further increase in strength, the annealed material is precipitation hardened by heat treatments at 900°F (482°C). These precipitation hardening heat treatments increase ductility and toughness while they harden the material. Heat treatments above 1075°F (579°C) generally result in material softer than material in the annealed condition. The heat treatments are usually specified as...

ATI 17-4™ Technical Data Sheet FORMABILITY The tensile data for the ATI 17-4™ precipitation hardening stainless steel indicate that the alloy does not possess the high tensile elongation characteristic of the austenitic stainless steels. The material is capable of being mildly formed but is not capable of being severely formed. Forming is more easily accomplished in the overaged (such as H 1150-M from SA 693) condition than in the annealed condition. CUTTING Water jet or saw cutting are the safest methods for cutting. Wet abrasive cutting is typically acceptable, but may produce small...