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Aluminum precipitation strengthening delivers ultra-high tensile strength and outstanding fatigue resistance after aging treatment
Excellent dimensional stability with minimal deformation during heat treatment process
Corrosion performance comparable to 304 stainless steel, superior to ordinary martensitic PH steel
Good formability under solution annealed Condition A state for complex precision machining
Multiple aging heat treatment options (RH950, RH1050, CH900) to match different strength & toughness demands
Manufactured fully compliant with ASTM A564, AMS 5644 international aerospace standards
Long service life for high-load precision components, low maintenance cost
Product Overview
This series of 17-7PH round bars are hot forged & hot rolled solid semi-austenitic precipitation hardening stainless steel rods. After complete solution annealing, the material owns uniform internal grain structure, tight dimensional tolerance and great machinability. Custom aging heat treatment can be arranged to reach targeted high strength, hardness and fatigue performance.
17-7PH is aluminum-strengthened PH stainless steel, widely used in aerospace, precision spring and high-strength fastener fields. It balances superior formability before aging and ultra-high mechanical strength after aging, with less heat treatment distortion than other PH grades, ideal for intricate precision parts that need both rust resistance and extreme load capacity.
Material Grade Characteristics – 17-7PH (UNS S17700 / 1.4568)
Semi-austenitic precipitation hardening stainless steel containing Chromium, Nickel and Aluminum strengthening elements
Forms fine aluminum precipitates during aging to sharply boost tensile strength, yield strength and fatigue resistance
Low thermal deformation rate after heat treatment, perfect for complex thin-walled precision machined parts
Moderate corrosion resistance matching grade 304, stable in atmospheric, fresh water and mild organic acid media
Outstanding high-temperature spring performance, stable mechanical properties up to 316°C service temperature
Available in various aging states to trade off hardness, ductility and impact toughness for diverse working conditions
Chemical Composition (Weight %)
Grade
EN Standard No.
C ≤
Si ≤
Mn ≤
P ≤
S ≤
Cr
Ni
Al
Fe
17-7PH
—
0.09
1.00
1.00
0.040
0.030
16.0–18.0
6.5–7.75
0.75–1.50
Balance
X7CrNiAl17-7
1.4568
0.09
1.00
1.00
0.040
0.015
16.0–18.0
6.5–7.75
0.75–1.50
Balance
Mechanical Properties (Solution Annealed Condition A, ASTM A564)
Property
17-7PH Condition A
Minimum Tensile Strength
≥1170 MPa (170 ksi)
Minimum 0.2% Yield Strength
≥965 MPa (140 ksi)
Minimum Elongation (50mm gauge)
≥6 %
Minimum Brinell Hardness
≥229 HB
Note: RH950/RH1050/CH900 custom aging treatment available for higher hardness & strength requirements.
Ultra-High Strength & Excellent Fatigue Resistance Aluminum precipitation hardening greatly improves tensile strength and fatigue performance, ideal for cyclic load components like springs, fasteners and transmission shafts.
Low Distortion After Heat Treatment Minimal dimensional change during aging, perfectly suited for intricate thin-walled precision parts with tight tolerance demands.
Balanced Corrosion Resistance Corrosion resistance equivalent to 304 stainless steel, far superior to common alloy steel and martensitic stainless steel in mild corrosive environments.
Good Formability & Machinability Soft solution annealed Condition A state supports turning, milling, stamping and complex forming before aging hardening process.
Stable High-Temperature Performance Retain reliable mechanical properties up to 316°C continuous working temperature, widely used for high-temperature spring and sealing components.
Typical Applications
Aerospace airframe fasteners, precision springs and aircraft structural components
Aviation engine sealing parts, high-temperature washers and elastic components
Precision instrument springs, electronic connectors and elastic hardware
Chemical & food machinery high-strength bolts, valve core and wear-resistant sleeves
Coastal marine corrosion resistant fasteners and small structural blanks
Medical precision equipment, hydraulic actuator and load-bearing parts
Automotive high-performance springs and exhaust system fittings
Processing Service
We provide integrated hot forging, hot rolling and full precision machining services, and can produce finished components strictly according to customer drawings:
Cutting to fixed length, peeling, surface grinding & polishing
Gear cutting, special profile forming and surface passivation treatment
We have supplied a wide range of machined parts including shafts, spring blanks, fasteners, valve sleeves and precision hardware to customers worldwide.
Quality Assurance
Ultrasonic testing (UT) for internal rolling & forging defects
Tensile testing machine & hardness tester for mechanical property verification
High-precision dimensional measuring instrument for tolerance inspection
Spectrometer for full chemical composition verification per batch
Metallographic microscope for internal grain structure inspection
Mill Test Certificate (MTC EN 10204 3.1) can be provided together with shipment documents before delivery.
Packing & Delivery
Packing
Inner packaging: waterproof anti-rust polybag for moisture and dust protection
Outer packaging: reinforced fumigated wooden case / wooden pallet, suitable for long-distance sea transportation
Custom special packing solutions available upon customer request
Lead Time
Normally 10 – 45 days after receipt of advance payment. Exact delivery time depends on order quantity, bar diameter, length and customized heat treatment & machining requirements.
Request Custom Quotation
Please send us your required bar diameter, length, target aging condition, machining drawing and order quantity. Our professional engineer team will reply competitive factory direct price within 24 hours. Free material selection consultation and technical support for all clients!
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Distributor/Wholesaler
Year Established:
1998
Total Annual:
>1-2 billion
Employee Number:
>200+
Ecer Certification：
Verified Supplier
HengAn Weiye Steel Group (HA Group) is a leading Chinese supplier of special steel, alloy materials, and precision machining services, with nearly 30 years of industry experience. The company integrates material sourcing, manufacturing, processing, and international trade, providing one-stop solutio... HengAn Weiye Steel Group (HA Group) is a leading Chinese supplier of special steel, alloy materials, and precision machining services, with nearly 30 years of industry experience. The company integrates material sourcing, manufacturing, processing, and international trade, providing one-stop solutio...
