17-4PH (UNS S17400 /1.4542) Precipitation-Hardening Stainless Steel Round Bar

• Classic precipitation hardening stainless steel grade 17-4PH (UNS S17400, W.Nr 1.4542, SUS630)
• Adjustable ultra-high strength & hardness via different aging heat treatments (H900/H1025/H1150/H1075)
• Balanced corrosion resistance equivalent to 304 stainless steel against atmosphere, fresh water and mild acid
• Low carbon composition with Cu & Nb alloy elements, stable mechanical performance after aging hardening
• Good machinability in solution annealed state, custom CNC machining strictly per customer drawings
• Excellent dimensional stability with minimal deformation after heat treatment
• Manufactured in full compliance with ASTM A564, ASTM A705 and EN 10272 international standards
• Long service life for high-load precision components, low maintenance cost

This series of 17-4PH round bars are hot rolled / hot forged solid precipitation hardening stainless steel rods made from premium UNS S17400 raw material. After solution annealing treatment, the bars own uniform internal grain structure, stable dimensional tolerance and great processing performance. Different aging heat treatments can be customized to achieve targeted tensile strength, yield strength and hardness to meet high-load service demands.

17-4PH is the most widely used martensitic precipitation hardening stainless steel. It fills the performance gap between ordinary austenitic stainless steel and alloy steel: much higher strength than 304/316L while retaining decent anti-corrosion capacity, perfectly suited for precision mechanical parts that require both high strength and rust resistance.

• Martensitic PH stainless steel containing chromium, nickel, copper and niobium strengthening elements
• Copper precipitates during aging treatment to greatly boost tensile strength, yield strength and surface hardness
• Corrosion resistance comparable to 304 stainless steel, resistant to atmospheric corrosion, fresh water and dilute acid media
• Multiple heat treatment conditions available to balance strength, hardness and toughness
• Magnetic property after aging, good wear resistance and fatigue performance for fasteners, shafts and valve parts
• Low carbon design avoids carbide precipitation, reliable performance for long-term cyclic load working conditions

Note: Higher strength & hardness can be customized via H900 / H1025 / H1150 aging heat treatment.

We also supply a full range of stainless steel and special alloy round bars & forgings for different working conditions:

• Precipitation Hardening Stainless Steel: 15-5PH, 17-7PH, PH13-8Mo, XM-12
• Austenitic stainless steel: 304,316L,310S,321,347,904L,254SMo,253Ma,A286(Gr.660)
• Duplex stainless steel: 2205,2507,S32750,S32760,F51,F55,F60
• Special nickel alloys: Monel 400/K-500, Inconel 600/625/718, Hastelloy C22/C276, Incoloy 800/825/925
• Alloy steel: 4140, 4340, F11, F22, F91,42CrMo
• Carbon steel:A105,A516 Gr.70,A36,S235JR,P235GH,P355GH

1. Tunable Ultra-High Mechanical Strength

   Adjustable hardness and tensile strength through different aging processes; H900 treatment achieves maximum hardness for wear-resistant parts, H1150 improves toughness for heavy load components.

2. Moderate Corrosion Resistance

   Corrosion performance close to grade 304 stainless steel, resistant to atmospheric, freshwater and mild chemical corrosion, far superior to common alloy steel 4140/4340.

3. Stable Dimensional Performance

   Minimal distortion and residual stress after aging heat treatment, ideal for precision machined parts requiring tight tolerance.

4. Excellent Machinability & Fabrication

   Easy turning, milling, drilling and threading under solution annealed state; supports full CNC precision custom processing per drawings.

5. Outstanding Fatigue & Wear Resistance

   High surface hardness after aging reduces abrasion, long service life for cyclic load transmission components with low maintenance cost.

• Aerospace precision structural parts, fasteners and landing gear accessories
• Oil & gas wellhead valve stems, pump shafts, wear rings and couplings
• Food & beverage high-pressure processing equipment components
• Chemical industry mild acid medium valve trim, bushings and fittings
• Marine mechanical high-strength corrosion resistant bolts and studs
• Nuclear, paper making and textile heavy-duty transmission shafts
• Medical precision equipment, hydraulic actuator and load cell parts

We provide integrated hot rolling, forging and full precision machining services, and can produce finished components strictly according to customer drawings:

• Cutting to fixed length, peeling, surface grinding & polishing
• CNC Turning, Milling, Planing, Drilling, Boring, Threading
• Custom aging heat treatment (H900/H1025/H1075/H1150)
• Gear cutting, special profile forming and surface passivation

We have supplied a wide range of machined parts including shafts, piston blanks, fasteners, valve cores, sleeves and bearing components to customers worldwide.

We have a professional QC inspection team and complete testing equipment to ensure stable and reliable product quality:

• Ultrasonic testing (UT) for internal rolling/forging defects
• Tensile and hardness testing for mechanical property verification
• High-precision dimensional measuring instrument for tolerance inspection
• Spectrometer for full chemical composition verification
• Metallographic microscope for grain structure inspection

Every batch of products undergoes strict inspection before delivery. Mill Test Certificate (MTC) can be provided upon request.

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

Please send us your required bar diameter, length, heat treatment condition, machining drawing and order quantity. Our professional technical team will provide competitive factory direct price within 24 hours. Free material selection consultation and technical support for all clients.