17-7PH Forged Ring & Hollow Bar – ASTM A564 / AMS 5644 Certified

• 17‑7PH (AISI 631) aluminium‑containing precipitation‑hardening stainless steel ring & hollow bar, UNS S17700 / W.Nr 1.4568, complies with ASTM A693 and AMS 5644 aerospace‑industrial specifications
• Ni‑Cr‑Al alloy system; multiple standard heat‑treatment routes: TH1050 / RH950 / CH900, achieves ultra‑high strength via γ′ Ni₃Al precipitation strengthening after conditioning & aging cycles
• Good fatigue performance and moderate corrosion resistance comparable to 304 stainless steel; low dimensional shift after full heat‑treatment for precision ring‑hollow‑bar components
• Supplied in Condition‑A solution‑annealed soft austenitic blank for full‑range CNC turning, boring and groove‑machining prior to multi‑step conditioning plus aging heat‑treatment
• Custom OD, ID, wall‑thickness, height / length; full‑scope CNC processing strictly per customer CAD/PDF drawings
• Premium raw stock for aerospace spring retainer rings, high‑strength hollow‑bar preforms, elastic‑component blanks, high‑load fastener forgings and precision mechanical‑equipment ring‑shaped hardware

This series of 17‑7PH rings and hollow bars are manufactured by hot forging / hot‑piercing extrusion, followed by solution annealing to produce soft Condition‑A austenitic microstructure. Standard delivery is solution‑annealed Condition‑A soft blank ready for rough‑and‑finish CNC machining. Unlike 17‑4PH, 17‑7PH requires dedicated austenite‑conditioning + cooling transformation step before final precipitation aging to reach target high‑strength mechanical properties.

17‑7PH (AISI 631, UNS S17700 / 1.4568) is well‑known aluminium‑type precipitation‑hardening stainless steel. Strength comes from Ni₃Al gamma‑prime precipitates. Multiple qualified heat‑treatment sequences (TH1050, RH950, CH900) can be selected to adjust strength‑ductility‑fatigue balance. It delivers outstanding elastic‑fatigue performance, making it ideal for spring‑type and high‑stress precision components. Widely processed into seamless rolled rings, hollow‑bar sleeves, elastic‑retainer‑ring forgings and high‑strength fastener preforms for aerospace, defense, precision‑machinery and high‑performance mechanical‑equipment industries.

• Aluminium‑modified precipitation‑hardening PH stainless steel; high‑strength properties rely on complete multi‑step conditioning‑transformation‑aging heat‑treatment cycle
• Condition‑A as‑supplied state is fully austenitic, soft and machinable; cannot reach high strength without subsequent dedicated thermal processing
• TH1050 for balanced strength‑ductility; RH950 for higher strength; CH900 delivers maximum tensile strength with limited ductility for spring‑type applications
• Excellent fatigue and stress‑relaxation behaviour; moderate corrosion resistance comparable to 304, suitable for atmosphere and fresh‑water service, not for heavy‑chloride / strong‑acid environments
• Minimal dimensional distortion after complete heat‑treatment, well‑suited for tight‑tolerance precision ring‑hollow‑bar forgings
• Welding needs careful procedure; post‑weld full solution‑anneal plus complete conditioning‑aging sequence is mandatory to restore full mechanical‑properties
• Magnetic status changes after martensite transformation & aging; non‑magnetic in Condition‑A, becomes magnetic after completed heat‑treatment

表格

表格

Unified Base Delivery Standard: Hot Forged / Hot Pierced, Solution Annealed(Condition A), Air Quenched, Stress‑Relieved, Pickled

• PH Stainless Steel:17‑7PH,17‑4PH,15‑5PH
• Martensitic Stainless Steel: 410,420,431,440C
• Duplex / Super Duplex: 2205, S32750, S32760
• Super‑Austenitic: 904L, 254SMO
• Inconel Series: 600, 601, 625, 718, X‑750
• Incoloy Series: 800H / 800HT, 825, 925
• Hastelloy Series: C‑4, C22, C276, B3
• Heat‑Resistant Stainless: 253MA, 310S
• Alloy Steel:4140, F22, F91, A105

1 Multiple Specialized Heat‑Treatment RoutesTH1050 / RH950 / CH900 multi‑route thermal processes available, freely balance strength, ductility and fatigue‑resistance for ring‑hollow‑bar elastic‑component design requirements.

2 Excellent Fatigue & Stress‑Relaxation Performance
Gamma‑prime Ni₃Al precipitates deliver outstanding anti‑relaxation and fatigue‑life properties, excellent material for spring‑retainer rings and pre‑loaded hollow‑bar hardware.

3 Low Distortion After Full Heat‑Treatment
Well‑controlled dimensional change after conditioning‑aging cycles, suitable for precision‑tolerance forged ring‑hollow‑bar parts.

4 Good Formability In Condition‑A State
Solution‑annealed Condition‑A soft austenitic starting blank supports complex CNC machining for intricate ring‑groove and hollow‑bar profiles prior to hardening heat‑treatment.

5 Aerospace‑Qualified PH Grade
Widely‑accepted aerospace‑grade precipitation‑hardening stainless steel for high‑stress elastic‑type ring‑shaped forgings with abundant service data.

• Aerospace Industry: Spring‑retainer rolled‑ring forgings, elastic‑clip hollow‑bar preforms, high‑strength structural‑ring component blanks
• Precision Mechanical Equipment: Pre‑loaded sealing‑ring forgings, high‑fatigue‑load hollow‑bar sleeves, elastic‑hardware raw stock
• High‑Strength Fastener Manufacturing: High‑stress bolt‑and‑stud ring‑hollow‑bar forging pre‑forms
• Defense & Special‑Purpose Hardware: High‑fatigue‑performance ring‑shaped structural forgings
• General‑Industrial High‑Elastic‑Components: Circlip‑preform blanks, high‑stress spring‑seat ring‑hollow‑bar parts

We provide integrated hot‑forging / hot‑pierced hollow‑bar & seamless rolled‑ring production, full custom CNC machining per customer CAD/PDF drawings:

• Cut‑to‑length / ring‑height sizing, facing, centering, OD turning, ID boring, chamfering
• Precision threading, internal‑external groove‑machining, cylindrical grinding & surface polishing for ring‑hollow‑bar parts
• Custom full‑sequence heat‑treatment service: TH1050 / RH950 / CH900 multi‑step conditioning‑aging cycles
• Pickling, passivation anti‑corrosion surface finishing

We supply 17‑7PH ring forgings, hollow‑bar blanks and fully‑machined components for aerospace, precision‑machinery and global industrial clients.

• 100% UT ultrasonic + eddy‑current inspection for forging / piercing internal segregation, inclusion and surface crack defects
• Full‑batch tensile, yield, elongation & hardness mechanical‑property testing for each heat lot & full heat‑treatment sequence
• Spectrometer full‑spectrum chemical‑composition verification per heat number (strictly monitor critical Al‑Cr‑Ni alloying‑elements)
• Metallographic inspection: verify austenite / martensite / gamma‑prime precipitate status after conditioning‑aging cycles
• High‑precision micrometer & CMM inspection for OD, ID, wall‑thickness, height / length and dimensional‑tolerance control

Mill Test Certificate EN 10204 3.1 / 3.2 can be issued and delivered together with shipment documents before delivery.

Packing ‑ Inner: Independent anti‑rust plastic sleeve + waterproof film full wrap for ring / hollow‑bar surface scratch protection ‑ Outer: Reinforced fumigated wooden pallet / wooden case with separation blocks to avoid collision & deformation ‑ Custom heavy‑duty export packaging for large‑diameter rings & heavy‑wall hollow bars available upon request

Lead Time
Normally 25‑65 working days after receiving advance payment. Exact lead time depends on ring / hollow‑bar dimension, wall‑thickness, order quantity and custom multi‑step heat‑treatment / machining demands.

Please specify part type (ring / hollow bar), required heat‑treatment condition (Condition‑A / TH1050 / RH950 / CH900), OD‑ID‑wall‑thickness dimension and engineering drawings. Our PH‑stainless‑steel metallurgy team will provide competitive factory price within 24 hours. Free heat‑treatment‑route‑selection technical consultation for your elastic‑ring‑hollow‑bar application!