Type 17-7PH® Precipitation Hardening Alloy is a semi-austenitic stainless steel which is austenitic in the annealed condition, but martensitic in the hardened condition. Type 17-7PH® provides high strength and hardness, excellent fatigue properties, good corrosion resistance and minimum distortion upon heat treatment. It is easily formed in the annealed condition, then hardened to high strength levels by simple heat treatments to Conditions RH 950 and TH . The exceptionally high strength of Condition CH 900 offers many advantages where limited ductility and workability are permissible. In its heat treated condition, this alloy provides exceptional mechanical properties at temperatures up to 900 °F (482 °C).
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Carbon: 0.090 max
Manganese: 1.00 max
Silicon: 1.00 max
Chromium: 16.00- 18.00
Nickel: 6.50- 7.75
Aluminum: 0.75-1.50
Phosphorus: 0.040 max
Sulfur: 0.030 max
Iron: Balance
Density: (Cond. A): 0.282 lbs/in3 7.80 g/cm3
Electrical Resistivity: (microhm-cm) (all conditions): 60 °F (20 °C): 80
Thermal Conductivity: BTU/hr/ft2/ft/°F (W/m&#;K)
At 300 °F (149 °C): 9.5 (16.5)
Mean Coefficient of Thermal Expansion: in/inl°F (µm/m&#;K): (Cond. A):
70 -200 °F (21 -93 °C): 8.5 x 10-5 (15.3)
70 -400 °F (21 -204 °C): 9.0 x 10-5 (16.2)
70 -600 °F (21 -315 °C): 9.5 x 10-5 (17.1)
70 -800 °F (21 -427 °C): 9.6 x 1 o-6 (16.0)
Modulus of Elasticity: ksi (MPa)
29 x 103 (200 x 103) in tension
Magnetic Permeability:
Annealed: Weakly ferromagnetic
Heat treated: Strongly ferromagnetic
Strip Coil
Wire Products
Gauge Range:<.010 inches
Ultimate Tensile Strength: 150 KSI max ( MPa max)
Yield Strength (0.2% offset): 65 KSI max (450 MPa max)
Elongation: Consult Ulbrich Technical Services
Gauge Range: > .010 inches
Ultimate Tensile Strength: 150 KSI max ( MPa max)
Yield Strength (0.2% offset): 55 KSI max (380 MPa max)
Elongation: 20% min
Hardness: Rb 92 max
Typical Condition C
Ultimate Tensile Strength: 200 KSI min ( MPa min)
Yield Strength (0.2% offset): 175 KSI min ( MPa min)
Elongation: 1 % min
Hardness: Re 41 min (aim)
Consult Ulbrich Technical Services if tempers other than Condition C are required.
TH Typical
Ultimate Tensile Strength: 180 KSI min ( MPa min)
Yield Strength: (0.2% Offset) 150 KSI min ( MPa min)
Elongation: Consult Ulbrich Technical Services
Hardness: Re 38 min
RH950 Typical
Ultimate Tensile Strength: 210 KSI min ( MPa min)
Yield Strength: (0.2 Offset) 190 KSI min ( MPa min)
Elongation: Consult Ulbrich Technical Services
Hardness: Re 44 min
CH900 Typical
Ultimate Tensile Strength: 240 KSI min ( MPa min)
Yield Strength: (0.2% Offset) 230 KSI min ( MPa min)
Elongation: 1 % min
Hardness: Re 46 min (aim)
Refer to NACE (National Association of Corrosion Engineers) for recommendations.
# 1 - Hot rolled annealed and descaled. It is available in strip, foil and ribbon. It is used for applications where a smooth decorative finish is not required.
# 2D - Dull finish produced by cold rolling, annealing and descaling. Used for deep drawn parts and those parts that need to retain lubricants in the forming process.
# 2B - Smooth finish produced by cold rolling, annealing and descaling. A light cold rolling pass is added after anneal with polished rolls giving it a brighter finish than 2D.
#BA- Bright annealed cold rolled and bright annealed
#CBA- Course bright annealed cold rolled matte finish and bright anneal
#2 - Cold Rolled
# 2BA- Smooth finish produced by cold rolling and bright annealing. A light pass using highly polished rolls produces a glossy finish. A 2BA finish may be used for lightly formed applications where a glossy finish is desired in the formed part.
Polished - Various grit finish for specific polish finished requirements.
* Not all finishes are available for all alloys - Contact Ulbrich Sales for more information.
XC - Extra clean bright annealed or bright annealed and cold rolled Grease - Ultra-bright finish (for decorative applications)
Soap - Soap is not removed from tempered wire to act as a lubricant.
* Contact Ulbrich Wire for custom wire finishes.
Type 17-?PH® can be hardened by:
Heat treatment from "Condition A" (RH950 or TH)
Cold rolling: Condition 1/2 C, 3/4 C, C
Heat treatment of Condition C (CH900)
For best results refer to: SSINA's "Welding of Stainless Steels and Other Joining Methods".
Limitation of Liability and Disclaimer of Warranty: In no event will Ulbrich Stainless Steels & Special Metals, Inc., be liable for any damages arising from the use of the information included in this document or that it is suitable for the 'applications' noted. We believe the information and data provided to be accurate to the best of our knowledge but, all data is considered typical values only. It is intended for reference and general information and not recommended for specification, design or engineering purposes. Ulbrich assumes no implied or express warranty in regard to the creation or accuracy of the data provided in this document.
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Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
Machinability
Heat Treatment
Forming
Welding
Annealing
Aging
Applications
The two main properties of precipitation-hardened stainless steels are high corrosion resistance and high strength. Stainless steel grade 17-7 PH is a precipitation hardened stainless steel that possesses high strength and hardness, excellent fatigue properties, good formability, good corrosion resistance, and minimal distortion upon heat treatment. The properties of this alloy are well suited for aerospace applications.
Stainless steel grade 17-7 PH is suitable for use in fresh water and industrial atmospheres, and mild chemical and oxidizing environments. It is recommended that 17-7 PH should not be used in salt water or reducing environments.
The following sections will discuss in stainless steel grade 17-7 PH in further detail.
The chemical composition of stainless steel grade 17-7 PH is outlined in the following table.
Element Content (%) Chromium, Cr 16-18 Nickel, Ni 6.50 - 7.75 Manganese, Mn 1 max Silicon, Si 1 max Aluminum, Al 0.75 - 1.50 Carbon, C 0.09 max Phosphorous, P 0.040 max Sulfur, S 0.030 max Iron, Fe BalanceThe physical properties of stainless steel grade 17-7 PH are tabulated below.
Properties Metric Imperial Density 7.80 g/cm3 0.282 lb/in3The following table shows mechanical properties of stainless steel grade 17-7 PH (TH, bar and forgings).
Properties Metric Imperial Tensile strength MPa psi Yield strength 965 MPa psi Modulus of elasticity 204 GPa ksi Poisson&#;s ratio 0.27-0.30 0.27-0.30 Elongation at break 6% 6% Hardness, Rockwell C 38 38The thermal properties of stainless steel grade 17-7 PH are given in the following table.
Properties Metric Imperial Thermal conductivity 16.4 W/mK 114 BTU in/hr.ft2.°F Thermal expansion co-efficient (@0.000-100°C/32-212°F) 11 µm/m°C 6.11 µm/m°COther designations that are equivalent to stainless steel grade 17-7 PH include the following.
AISI 631 AMS AMS AMS AMS AMS ASTM A313 (631) ASTM A564 (631) ASTM A579 (631) ASTM A693 (631) ASTM A705 (631) DIN 1. MIL S- DIN 1. AMS AMS ASME SA705 ASTM A579 (grade 62) MIL SPEC MIL-W- SAE J217 SAE J467Let us source quotes for you for X-Ray Fluorescence Analyzers, Optical Emission Spectrometers, Atomic Absorption Spectrometers or any other analysis instrument you are looking for.
Request a Quote HereMachinability of stainless steel grade 17-7 PH is rated at 75 % of B. On machining, this alloy displays long gummy chips and requires chip breakers. It is recommended that slow speeds and constant feeds while machining will provide excellent results.
For heat treating stainless steel grade 17-7 PH, three important steps need to be carried out - austenite conditioning, cooling to transform the austenite to martensite, and precipitation hardening to condition TH or RH 950.
Forming characteristics of stainless steel grade 17-7 PH are similar to stainless steel grade 301. For radical forming operations, intermediate annealing may be required.
Common arc and resistance methods can be used with stainless steel grade 17-7 PH. It is recommended that during fusion welding inert gas shielding should be performed to reduce the oxidation of aluminum during the process.
Annealing of stainless steel grade 17-7 PH is performed at °C (°F) for 3 min for every 0.1 inch (2.5 mm) of thickness, and then air cooled.
Stainless steel grade 17-7 PH is solution annealed at °C (°F) for 4 h and air cooled. Same step is performed at °C (°F) for 4h and air cooled, then at 843°C (°F) for 24h and air cooled, and at 760°C (°F) for 16h and air cooled. This completed the precipitation hardening process. For excellent results and performance, the material should be clean and free from scale and impurities.
Stainless steel grade 17-7 PH is primarily used for applications requiring corrosion resistance, good strength, and mechanical properties up to 427°C (800°F) in operation. It is also commonly used for intricate parts due to its low distortion in heat treatment.
Stainless steel grade 17-7 PH finds uses in the following:
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