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17-7PH Stainless Steel (AMS / AMS / AMS )

Technical Data Sheet

Alloy 17-7PH a precipitation hardening stainless steel that provides high strength and hardness, excellent fatigue properties, good corrosion resistance, good formability, and minimum distortion upon heat treatment. 

Alloy 17-7PH provides valuable property combinations particularly well suited for aerospace applications. This special alloy also provides benefits for other applications requiring high strength and good corrosion resistance, as well as excellent properties for flat springs at temperatures up to 315°C (600°F ).

Corrosion Resistance
17-7PH stainless steel provides corrosion resistance in conditions TH and RH 950 is generally superior to that of the standard hardenable chromium types of stainless steels such as Types 410, 420 and 431, but is not quite as good as chromium-nickel Type 304. Corrosion resistance in Condition CH 900 approaches that of Type 304 in most environments.

Formability
In Condition A, Alloy 17-7 PH can be formed comparably to Type 301. It work hardens rapidly and may require intermediate annealing in deep drawing or in forming intricate parts. Spring-back is similar to that of Type 301. Alloy 17-7 PH is extremely hard and strong in Condition C. Therefore, fabrication techniques for such materials must be used.

Chemical Composition Limits Weight% C Mn Si P S Cr Ni Al 17-7PH 0.09 max 1.00 max 1.00 max 0.040 max 0.030 max 16.00-18.00 6.50-7.75 0.75-1.50

Typical Mechanical Properties

 

Material Condition

Ultimate Tensile Strength (ksi) 0.2 % Yield Strength (ksi) Elongation % in 2D % Reduction of Area Rockwell C Hardness 17-7 Sheet / Strip
AMS Cond A 105 max 65 20 - 92 HRB max 17-7 Sheet / Strip
AMS TH 180-120 150 4-6 - 38-46 17-7 Sheet / Strip RH950 220 200 9 - 46 17-7 Sheet / Strip
AMS Cond C 200 min 175 min 1 - 41 min 17-7 Sheet / Strip
AMS CH 900 240 min 230 min 1 - 46 min 17-7 Bar
AMS Cond A 170 min 140 min 6 25 363 HB min

Availability
Alloy 17-7PH is available in Sheet, Strip, Plate, Bars (Round Bars), Tube, Forgings and Welding Wire. 17-7PH Foil (Shim) is available in various thicknesses. View stock list for further information. Foil Stock List, Sheet Stock List, Plate Stock List. or contact Sales.

Specifications
Type 17-7 PH Stainless Steel is covered by the following specifications:
AMS Sheet, Strip and Plate
AMS Sheet, Strip Cold Rolled
AMS Welded Tubing
AMS Bars and Forgings (Cap. ASTM A 564 Type 631)
AMS Wire
AMS Welding Wire
MIL-S- Cond. C, Sheet, Strip and Plate
ASTM A 693, ASTM A 313, ASTM A 564, ASTM A 579 and ASTM A 705
ASME SA 564, SA 693 and SA 705
UNS S

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Disclaimer
Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.

 

17-7 - UNS S:

Type 17-7 PH is a semi-austenitic precipitation hardening alloy that provides high strength and hardness, excellent fatigue properties, good corrosion resistance, and minimum distortion upon heat treatment. Corrosion resistance is similar to AISI Type 304 stainless steel; having good resistance to staining and pitting under normal atmospheric conditions with a Pitting Resistance Equivalent Number (PREN) of 17. These properties make it an ideal material choice for aerospace applications and products requiring high strength and good corrosion resistance. It retains remarkable mechanical and physical properties at high temperatures.

Type 17-7 PH is a semi-austenitic precipitation hardening alloy that provides high strength and hardness, excellent fatigue properties, good corrosion resistance, and minimum distortion upon heat treatment. Corrosion resistance is similar to AISI Type 304 stainless steel; having good resistance to staining and pitting under normal atmospheric conditions with a Pitting Resistance Equivalent Number (PREN) of 17. These properties make it an ideal material choice for aerospace applications and products requiring high strength and good corrosion resistance. It retains remarkable mechanical and physical properties at high temperatures.

17-7 precipitation hardening alloy may be formed in a soft austenitic condition and hardened to a high strength level by low temperature heat treatments. The low temperature allows minimum distortion compared to conventional quench and temper hardening processes. In the soft austenitic annealed condition, 17-7 is highly formable and ideal for operations such as tube drawing, bending, and end forming. 17-7 is readily weldable in both the annealed and heat treated conditions.

Physical Properties:

• Melting Point: - °F ( &#; °C)
• Density: 0.282 lbs/in

  3

  / 7.8 g/cm

  3

• Modulus of Elasticity in Tension (RH 950 & TH ): 29.6 X 10

  6

   psi / 204 GPa

Mechanical Properties:

Condition: Annealed
• Tensile Strength Minimum (psi): 130,000
• Yield Strength Minimum 0.2% offset (psi): 40,000
• % Elongation in 2&#; Typical: 35%
• Hardness: Rockwell B85

Condition: Hardened + Aged (TH)
• Tensile Strength Typical (psi): 200,000
• Yield Strength Typical 2% offset (psi): 185,000
• % Elongation in 2": 9%
• Hardness: Rockwell C40

Condition: Hardened, Cryogenic Quench + Aged (RH950)
• Tensile Strength Typical (psi): 235,000
• Yield Strength Typical 2% offset (psi): 220,000
• % Elongation in 2": 6%
• Hardness: Rockwell C48

Condition: Cold Rolled/Worked + Aged (CH900)
• Tensile Strength Typical (psi): 265,000
• Yield Strength Typical 2% offset (psi): 260,000
• % Elongation in 2": 2%
• Hardness: Rockwell C49

Composition:

• Carbon: 0.09 max
• Manganese: 1.00 max
• Phosphorus: 0.040 max
• Sulfur: 0.030 max
• Silicon: 1.00 max
• Chromium: 16.00 - 18.00
• Nickel: 6.50 - 7.75
• Aluminum: 0.75 - 1.50
• Iron: Balance

Heat Treatments:

17-7 requires three essential steps in heat treating:

1. Austenite conditioning.
2. Cooling to transform the austenite to martensite
3. Precipitation hardening to Condition TH or RH 950
4. Alternatively, to obtain the highest mechanical properties from the alloy, Condition A material is transformed to martensite at the mill by cold reduction to Condition C. Hardening to Condition CH 900 is accomplished with a single, low-temperature aging heat treatment.

Corrosion Resistance:

17-7 requires three essential steps in heat treating:

Corrosion resistance in Conditions TH and RH 950 is generally superior to that of the standard hardenable chromium types of stainless steels such as Types 410, 420 and 431. Corrosion resistance in Condition CH 900 approaches that of Type 304 in most environments.

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