The 1.4460 Duplex Stainless Steel Round Bar (UNS S32900 / AISI 329) is supplied in a bright black finish, offering a high-strength, corrosion-resistant solution for demanding industrial applications. Combining ferritic and austenitic microstructures, this duplex grade delivers excellent mechanical performance and resistance to stress corrosion cracking.

• High yield strength and tensile strength from duplex microstructure
• Excellent resistance to stress corrosion cracking and pitting
• Good weldability and machinability for fabrication processes
• Bright black finish suitable for precision and decorative applications
• Reliable performance in chemical, marine, and process industries

1.4460 Round Bar

EN: 1.4460, X3CrNiMoN27‑5‑2 | UNS S32900 | AISI 329 | JIS SUS329J1 | GB: 0Cr26Ni5Mo2 / 00Cr25Ni5Mo2 Duplex stainless steel round bar (austenitic‑ferritic), supply standard: EN 10088‑3 / ASTM A276; available in hot rolled, forged, peeled / bright turned, ground finish, with 3.1 / 3.1B certificate

Chemical Composition (wt.%, max unless range)

PREN ≥ 31, good resistance against pitting & crevice corrosion in chloride mediaMade-in-Ch...

Mechanical Properties (room temp, solution annealed)

Compared with common 316L, it delivers roughly double yield strength and far better chloride stress corrosion cracking resistance; machinability is better than 1.4462, while weldability is moderate (requires proper welding procedure)Alleima

Applications

• Marine: propeller shafts, pump shafts, seawater pump & valve components
• Petrochemical & chemical: agitators, compressor parts, phosphoric acid equipment
• Fasteners: high‑strength bolts, nuts for corrosive service
• Offshore, desalination, pressure vessel fittings

1.4460 FAQ

Grade: 1.4460｜X3CrNiMoN27‑5‑2｜UNS S32900｜AISI 329, first‑generation duplex stainless steel

Q1: What is 1.4460?

A: 1.4460 is an austenitic‑ferritic duplex stainless steel, commonly called AISI 329 / UNS S32900. It features roughly 50/50 austenite + ferrite microstructure, high yield strength and good chloride corrosion resistance; it is famous for better machinability than 1.4462 (2205)Fushun Spe....

Q2: What are its equivalent grades?

A:

• EN: X3CrNiMoN27‑5‑2, W.Nr. 1.4460
• UNS: S32900
• AISI: 329
• JIS: SUS329J1
• GB: 0Cr26Ni5Mo2 / 00Cr25Ni5Mo2
• Standard: EN 10088‑3, ASTM A276 (round bar), ASTM A479, EN 10216‑5 (pipe)

Q3: PREN value of 1.4460?

 A: PREN ≥ 31. It offers reliable resistance to pitting, crevice corrosion and chloride stress corrosion cracking, higher than 316L but lower than 2205 / 254SMO.

Q4: 1.4460 vs 1.4462 (2205), which one to pick?

A:

• ✅ 1.4460: Higher Cr, lower Mo; better machinability, easier for heavy machining; good choice for shafts, bolts, pump parts.
• ✅ 1.4462 (2205): Higher Mo & N, higher PREN, superior pitting resistance, better weldability; more popular for general duplex piping. If your part requires lots of turning / milling, 1.4460 is preferred; if heavy chloride corrosion is the main risk, choose 2205.

Q5: What is the typical heat treatment?

A: Solution anneal at 1020–1100 °C, hold thoroughly then rapid water quench, to keep balanced two‑phase structure. Important: Avoid long holding between 300–900 °C; σ‑phase and 475 °C embrittlement will sharply drop toughness and corrosion resistance. Hot forging range: 950–1200 °C; re‑solution treatment is required after hot working.

Q6: Can 1.4460 be welded?

A: Yes, but less forgiving than 2205.

• Recommended methods: GTAW / TIG, GMAW; avoid oxy‑acetylene.
• Use matching or over‑alloyed duplex filler wire/rod.
• Control heat input and interpass temperature; slow cooling must be prevented.
• Critical service: post‑weld pickling & passivation; re‑solution annealing may be specified by project standard.

Q7: How about its machinability?

 A: Moderate to good among duplex steels, the main advantage over 1.4462. Still work‑hardening. Use carbide tools, low cutting speed, ample coolant and stable feed. Sharp tools reduce built‑up edge. That is why it is widely used for heavily machined pump shafts and fastenersFushun Spe....

Q8: What forms can you supply?

 A: Round bar (hot rolled, forged, peeled, bright turned, ground), flat bar, plate, seamless pipe, forgings, fastener blanks. Standard certificate: EN 10204 3.1 / 3.1B; PMI, UT, MT available on request.

Q9: Typical applications?

 A: Marine propeller & pump shafts, seawater valves, agitators, compressor components, high‑strength duplex bolts & nuts, phosphoric acid equipment, desalination fittings, corrosion fatigue parts for offshore and petrochemical serviceFushun Spe....

Q10: What is the limitation of 1.4460?

 A: Not suitable for continuous high‑temperature service above ~300 °C due to embrittlement risk. Its pitting resistance is lower than modern duplex / super duplex grades. Not recommended for very aggressive hot brine where 254SMO or super duplex is specified.

Q11: Mechanical properties (solution annealed, RT)

 A:

• Rp0.2 ≥ 450 MPa
• Rm: 620–880 MPa
• Elongation A ≥ 20%
• Hardness ≤ 260 HB
• Density: 7.8 g/cm³

Q12: HS code for 1.4460 round bar?

A: 7222200000 (stainless steel bar, common tariff code; confirm with local customs before shipment).

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