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17-4PH Solid Shaft / Hollow Shaft

Product Highlights

17-4PH martensitic precipitation hardening solid shaft & hollow shaft, UNS S17400, EN 1.4542, comply with ASTM A564 bar standard
Cu & Nb alloyed precipitation strengthening system, adjustable strength & hardness via different aging heat treatments
Multiple standard aging grades: H900 / H1025 / H1075 / H1150 / H1150D for diverse load & toughness demands
Corrosion performance equivalent to 304 stainless steel, far superior to regular 410/440C martensitic steel
Fully magnetic after heat treatment, low distortion after aging, ideal precision high-strength shaft blanks
Two stock forms: solid round shaft & seamless hollow shaft, save deep boring processing cost for hollow parts
Custom diameter, wall thickness, length & full CNC turning, boring, threading, splining per CAD drawings
Core material for aerospace, oil & gas, valve, mold, medical and high-strength mechanical spindles

Product Overview

This series of 17-4PH solid and hollow shafts are produced via hot rolling + cold drawing seamless piercing forming process. Base material is supplied under Condition A (Solution Annealed soft state) for easy CNC machining; customers can select target aging specification to achieve customized hardness and toughness.

17-4PH (AISI 630 / 1.4542) is the most widely used precipitation hardening stainless steel. It combines medium corrosion resistance and ultra-high mechanical strength, filling the gap between common martensitic stainless steel and high-cost nickel superalloys. Solid shaft is for solid spindle, bolt and shaft core; seamless hollow shaft eliminates deep boring operation on solid bar, greatly reducing material waste and machining cycle. Both stock types are widely machined into pump shafts, valve stems, aerospace structural spindles, oilfield downhole components, mold core shafts and medical instrument rotating parts for aerospace, petroleum, chemical, medical and mold industries.

Material Grade Characteristics – 17-4PH (UNS S17400 / 1.4542)

Martensitic PH stainless steel strengthened by copper-niobium precipitates after low-temperature aging
Condition A soft solution state for all machining workpieces before aging heat treatment
H900 aging delivers maximum hardness & tensile strength for heavy wear components
H1150 / H1150D double aging obtains optimal toughness & anti-SCC performance for sour gas service (NACE compliant)
Balanced corrosion resistance comparable to 304, better than 410/420/440C martensitic grades
Low thermal distortion after aging, stable dimensional accuracy for precision equipment shafts
Good weldability, can be aged after welding without large deformation

Chemical Composition (Weight %)

Grade	EN No.	C ≤	Si ≤	Mn ≤	P ≤	S ≤	Cr	Ni	Cu	Nb+Ta	Mo ≤	Fe
17-4PH	1.4542	0.07	1.00	1.00	0.040	0.030	15.0–17.5	3.0–5.0	3.0–5.0	0.15–0.45	0.60	Balance

Mechanical Properties (ASTM A564 Standard Heat Treatment States)

Delivery Condition	Min Tensile MPa	Min Yield MPa	Min Elongation %	Hardness Reference
Condition A (Solution Annealed)	1040	690	18	≤38 HRC
H900 (Aged 482℃)	1310	1170	10	40–47 HRC
H1025 (Aged 552℃)	1070	1000	12	35–42 HRC
H1075 (Aged 579℃)	1000	860	14	33–39 HRC
H1150 (Aged 621℃)	930	725	16	28–37 HRC
H1150D Double Aged	860	725	18	26–33 HRC

Unified Base Delivery Condition: Hot Rolled / Cold Drawn, Solution Annealed (Condition A), Stress‑Relieved, Pickled

Related Material Grades

PH Stainless Steel: 17-4PH, 15-5PH, 17-7PH
Martensitic Stainless Steel: 410, 420, 431, 440C
Austenitic Stainless Steel: 304, 316L, 321, 904L
Duplex Stainless Steel: 2205, 2507, S32750
Ferritic Stainless Steel: 409, 430, 444
Nickel Alloys: Monel400/K500, Inconel600/625, Hastelloy C276
Alloy Steel: 4140, F22, F91, A105

Key Advantages

1 Adjustable Hardness via Aging Treatment

Start from soft Condition A blank for full CNC machining, then age to H900~H1150 grades to match strength/toughness requirements of different working loads.

2 Better Corrosion Than Regular Martensite

Chromium-nickel-copper composite formula delivers corrosion resistance equivalent to 304, far outperforming 410/440C in atmospheric and weak acid environments.

3 Low Deformation After Aging

Minimal dimensional shift during precipitation hardening, perfectly suitable for precision shaft and mold core parts with tight tolerance.

Double Stock Option: Solid & Hollow Shaft

Seamless hollow shaft avoids heavy deep boring on solid bar, greatly cuts processing time and raw material loss for hollow spindle products.

NACE Qualified H1150D Grade

Double aged state improves sulfide stress cracking resistance, approved for oil & gas sour well downhole shaft components.

Typical Applications

Aerospace: Landing gear spindles, engine high-strength rotating shafts, aircraft fastener blanks
Oil & Gas: Sour well pump shafts, wellhead valve stems, downhole tubular spindles (H1150D)
Mold Industry: High-strength mold core shafts, injection mold ejector pins
Chemical Equipment: High-pressure valve spindles, agitator shafts, medium-corrosion pump rods
Medical Instrument: Surgical equipment shafts, precision medical fixture blanks
General Machinery: High-load gear shafts, hydraulic cylinder rods, bearing mandrels

Processing Service

We provide integrated hot rolling & seamless piercing hollow shaft production, full custom CNC processing per customer CAD drawings:

Fixed-length cutting, centering, external turning, hollow inner boring, chamfering
Threading, spline machining, cylindrical precision grinding, mirror polishing
Full aging heat treatment service: H900 / H1025 / H1075 / H1150 / H1150D
Pickling, passivation surface anti-corrosion finishing

We supply 17-4PH solid shaft & seamless hollow shaft blanks and finished machined spindles for aerospace, oil gas, mold and medical global industrial clients.

Quality Assurance

100% UT & Eddy Current inspection for rolling & piercing internal defects
Full batch tensile, yield, hardness mechanical test for each aging grade
High-precision micrometer & CMM to control diameter, wall thickness, straightness tolerance
Spectrometer full chemical composition test per heat lot
Metallographic martensite-precipitate microstructure inspection after aging

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

Packing & Delivery

Packing

Inner: Individual anti-rust plastic sleeve + waterproof film full wrap
Outer: Reinforced fumigated wooden pallet with separation strips to prevent scratch & bending
Custom heavy-duty export packaging for large-diameter long shafts available upon request

Lead Time

Normally 10 – 45 working days after receiving advance payment. Exact lead time depends on shaft type (solid/hollow), diameter, length, order quantity and custom aging/machining demands.

17-4PH Solid Shaft / Hollow Shaft

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Categories	Precision Shaft
Standard:	ASTM A564 / A693 AMS 5643 / AMS 5604
Tolerance:	h6, g6, or as required
Place of Origin:	China
Delivery Time:	10–30 Working Days
Dia (mm):	Solid: 6 – 500 Hollow: OD 50 – 600, WT 10 – 150
Grade:	UNS S17400 / 1.4542 AISI 630
Surface Finish:	Solid: Ground / Peeled / Turned / Polished Hollow: As forged / Rough bored / Finish bored
Packaging Details:	Waterproof polybag + Export wooden pallet / wooden case
MOQ:	1 Piece / Small trial order acceptable
Payment Terms:	T/T,L/C AT SIGHT
Length Range:	Solid: 1000 – 6000 (Standard) Hollow: Customizable
Brand Name:	HA Steel