Duplex Stainless Steel 329 Round Bar
➡️ Alloy 329 | UNS S32900 | AISI 329 | SUS329J1 | EN 1.4460
➡️ ASTM, EN, JIS & International Standards
➡️ Supply Conditions
➡️ Multiple Diameters & Supply Lengths
➡️ Global Export & International Delivery
Country of Origin:
Europe, Japan, USA
Material Type:
Duplex Stainless Steel
UNS Number:
S32900
Wr. No.:
1.4460
MTC Available:
EN 10204 3.1
Product Description for Duplex Stainless Steel 329 Round Bar
Duplex Stainless Steel 329 Round Bar (UNS S32900,EN 1.4460) is one of the earliest commercially established duplex (ferritic-austenitic) stainless steel grades, predating the modern standard-duplex family represented by 2205 (S31803/S32205). It is a chromium-nickel-molybdenum alloy without a guaranteed nitrogen addition, giving it a lower Pitting Resistance Equivalent Number (PREN, approximately 26–32) than 2205, and correspondingly more limited use in aggressive seawater or high-chloride service. Its higher permitted carbon content compared with later duplex grades reflects its earlier development and narrower application window.
329 is produced as hot-rolled or forged round bar, then solution annealed (typically in the range of approximately 950–1100°C) and water quenched to develop a balanced two-phase microstructure, typically 55–75% ferrite in the annealed condition. It is covered by ASTM A276 (general bar and shapes) and ASTM A479 (pressure-vessel bar), with EN 10088-3 as the corresponding European bar and forging standard. A distinguishing commercial characteristic of 329 is its formulation with optimized sulfide inclusion morphology for improved machinability relative to many other duplex grades, making it a practical choice where moderate corrosion resistance is combined with a requirement for extensive machining.
Typical applications include pump and compressor components, marine shafts, heat exchangers, chemical storage tanks, and general engineering parts operating in mildly to moderately corrosive, chloride-containing environments — but not in the more aggressive seawater or high-chloride-process conditions where 2205 or super duplex grades are specified. Design stress values for S32900 in recognized pressure-vessel codes are typically not extended above approximately 260°C, reflecting a susceptibility to embrittlement at moderate-to-high service temperatures with slow cooling. Purchasers should confirm the governing bar standard (A276 vs. A479), required delivery condition (solution annealed), and should not assume 329 is a drop-in substitute for 2205, since its lower guaranteed corrosion resistance is a substantive engineering distinction rather than a minor grade variation.
Common Applications of Duplex Stainless Steel 329 Round Bar
➡️ Machined shafts, spindles, valve stems, pump sleeves and pins for food, beverage, dairy and pharmaceutical equipment, where the passive chromium oxide film resists both product acids and caustic clean-in-place chemicals.
➡️ Fasteners, studs, bolts, threaded rod and anchor components produced from bar stock, chosen for corrosion resistance combined with the ductility needed for cold heading and thread rolling.
➡️ Chemical, water treatment and general process plant parts such as agitator shafts, flange blanks, nozzles and support components handling water, steam and mildly corrosive media free of significant chlorides.
➡️ Architectural and structural hardware including handrail stanchions, balustrade fittings, tension rods and bollards, where a bright ground or polished bar finish provides both appearance and low maintenance.
International Equivalent Grade for Alloy 329 Round Bar
Standard
Country / Region
Grade
UNS
USA
UNS S32900
ASTM / AISI / SAE
USA
AISI/ASTM Type 329; ASTM A276 / A479 (bar); A240
JIS
Japan
SUS329J1
EN
Europe
1.4460, X3CrNiMoN27-5-2 (EN 10088-3)
BS
United Kingdom
EN 10088-3 1.4460
KS
South Korea
STS329J1
AFNOR
France
Z5CND27-05Az (Z2 CND 27.05Az)
Technical Specification for Duplex Stainless Steel 329 Round Bar
Specification
Value
Unit
Material
Duplex stainless steel
-
Grade
UNS S32900
-
Standard
ASTM A276, ASTM A479, EN 10088-3
-
Product Form
Round bar (hot-rolled or forged)
-
Diameter
25 – 185
mm
Length
Typically mill lengths; cut lengths available to order
mm
Manufacturing Process
Hot rolled or forged, then solution annealed and water quenched
-
Surface Finish
Black/hot-rolled (as-forged/rolled + pickled) or turned; bright cold-drawn bar
-
Heat Treatment
Solution annealed and quenched
-
Delivery Condition
Solution annealed and quenched (Condition A)
-
Tolerance Standard
EN 10060 (hot-rolled round bar) or ASTM A484 (cold-finished), per ordering standard
-
Dimensional Tolerance
Depends on finish class — confirm against ordering standard
mm
Straightness
Typically ≤ 1–3 mm/m, per applicable dimensional standard
mm/m
Carbon Equivalent (CEV)
Not applicable
-
Density
7.80
g/cm³
Magnetic Properties
Ferromagnetic
-
Corrosion Resistance
Good resistance to pitting, crevice corrosion, and stress corrosion cracking in mild-to-moderate chloride environments; PREN ≈ 26–32
-
Thermal Conductivity
Not consistently published across producer sources for this grade; distributor data is limited confirm with supplier
-
Electrical Resistivity / Conductivity
Not consistently published across producer sources for this grade confirm with supplier
-
Specific Heat
~460 (0–100°C, one producer source)
J/kg·K
Coefficient of Thermal Expansion
~14.4 × 10⁻⁶
/K
Melting Range
Not consistently published for this grade in available producer/distributor sources confirm with supplier
°C
Technical Specifications
Get the key technical specifications for Duplex Stainless Steel 329 Round Bar
329 round bar is identified by UNS S32900, EN 1.4460, or the legacy AISI/ASTM “Type 329” designation, and by the Japanese SUS329J1 designation — buyers should take care not to confuse this with the visually similar SUS329J3L (which is the JIS equivalent of 2205, a different and higher-alloy grade). As with other duplex bar, the governing bar standard should be specified: ASTM A276 for general bar and shapes, or ASTM A479 (ASME SA-479) where boiler/pressure-vessel documentation and end hardness testing are required. EN 10088-3 is the corresponding European standard.
Because 329 predates the standard-duplex family represented by 2205, published mechanical and physical property data is less consistently available across independent producer sources than for 2205 — several physical properties (notably melting range and electrical resistivity) are not reliably published in the distributor literature reviewed for this content and should be confirmed directly with the supplying mill before being relied upon for design purposes. Bar is always supplied solution annealed and water quenched; no secondary hardening heat treatment applies. Dimensional tolerances follow the ordered finish class (hot-rolled/forged black bar vs. turned or bright bar) under EN 10060 or ASTM A484, and should be confirmed against the specific ordering standard referenced on the purchase order.
Chemical Composition for Duplex Stainless Steel 329 Round Bar
Element
Symbol
Min
Max
Unit
Carbon
C
-
0.08
%
Chromium
Cr
23.00
28.00
%
Nickel
Ni
2.50
6.5
%
Molybdenum
Mo
1.00
2.00
%
Manganese
Mn
-
2
%
Silicon
Si
-
1
%
Phosphorus
P
-
0.040
%
Sulfur
S
-
0.030
%
Nitrogen
N
0.05
0.20
%
Iron
Fe
-
Balance
%
Chemical Composition
View the chemical composition and applicable material limits for Alloy 329 Round Bar
Chromium is present at a notably higher level (23–28%) than in 2205 (21–23%), which on its own would suggest strong corrosion resistance; however, 329 does not carry a guaranteed nitrogen addition, and its molybdenum range (1.0–2.0%) is lower than 2205’s (2.5–3.5%). The net effect, captured in the PREN calculation, is a lower overall pitting resistance equivalent (approximately 26–32) than 2205 (approximately 34–36), despite the higher chromium content — illustrating why chromium content alone should not be used to infer corrosion performance across duplex grades. Nickel (2.5–5.0%) is present mainly to balance the ferrite/austenite ratio rather than to independently drive corrosion resistance.
The higher permitted carbon content (0.08% max, versus 0.03% max for 2205) is a legacy characteristic of this earlier-generation grade and makes 329 somewhat more prone to chromium carbide precipitation at grain/phase boundaries during welding or extended thermal exposure, which can locally reduce corrosion resistance in the heat-affected zone compared with the very-low-carbon modern duplex grades. This grade is commercially known for optimized sulfide inclusion morphology, which improves machinability relative to many other duplex grades without a significant sacrifice in mechanical properties, making it a practical choice for parts requiring extensive machining. Phosphorus and sulfur are controlled to protect toughness and hot workability, consistent with standard duplex-grade practice.
Mechanical Properties for Duplex Stainless Steel 329 Round Bar
Mechanical Property
Value
Unit
Tensile Strength
620–880
MPa
Yield Strength (0.2% Proof)
450-485 min
MPa
Elongation
15-20 min
%
Hardness
260-290
HB
Impact / Charpy Properties
85 min
J
Proof Stress / 0.2% Proof Strength
450-485 min
MPa
Ultimate Tensile Strength
620–880 min
MPa
Mechanical Properties
Check the key mechanical properties and performance requirements of Alloy 329 Round Bar
329’s guaranteed 450 MPa minimum yield strength gives it load-bearing capacity comparable to 2205 and roughly double that of standard austenitic stainless steels, supporting its use in shafts, pump components, and other moderately loaded mechanical parts. Elongation of approximately 20% minimum indicates adequate ductility for a high-strength duplex grade, though — as with all duplex stainless steels — the material work-hardens more than austenitic grades during cold forming and machining, which should be accounted for in tooling selection.
Toughness is high at room temperature but, as with other duplex grades, is sensitive to thermal history: 329 is documented as prone to embrittlement when exposed to moderate-to-high temperatures with slow cooling, and design stress values in recognized pressure codes are typically not extended above approximately 260°C for this grade. The proportion and orientation of ferrite in welds and base material can significantly affect toughness at sub-zero temperatures, so low-temperature service should be qualified by impact testing rather than assumed from room-temperature data. Hardness in the solution-annealed condition (≤260 HB typical) reflects a machinable, non-wear-resistant delivery condition consistent with this grade’s marketed advantage in machinability relative to other duplex alloys.
Dimension / Sizes for Duplex Stainless Steel 329 Round Bar
Dimension / Size
Value
Unit
Diameter
25 - 185
mm
Standard Length
Typically mill lengths (supplier-dependent)
mm
Custom Length
Cut-to-length available to order
mm / m
Diameter Tolerance
Per EN 10060 (hot-rolled) or ASTM A484 (cold-finished), depending on ordered finish
mm
Length Tolerance
Per ordering standard
mm
Straightness Tolerance
Typically ≤ 1–3 mm/m per applicable standard
mm/m
End Condition
Saw cut (standard); other end conditions to order
-
Surface Finish
Hot-rolled/forged black bar or turned bar; bright cold-drawn bar less commonly stocked for this grade
-
Out-of-Roundness
Per applicable dimensional standard for the ordered finish class
mm
Ovality
Per applicable dimensional standard for the ordered finish class
mm
Dimensions & Sizes
Explore available diameters, lengths, and dimensional requirements for Alloy 329 Round Bar
Pricing for Duplex Stainless Steel 329 Round Bar
Round Bar Prices are generally quoted per kilograms or meters tonnes and can fluctuate with the global raw material and market prices. The final price will depend on a variety of factors, including the grade size, diameter, length, surface finish, the quantity and whether the bars are cut to length or in standard lengths.
For smaller quantities, we can also quote per metre or per piece basis once the required dimensions have been confirmed. Container-loads or orders that are larger in size are typically priced per tonne, based upon the specifications required and the supply conditions.
Please provide your desired dimensions, grades, length number, and end for a current quote including the lead time applicable and details for certification.
Pricing
Get current Duplex Stainless Steel 329 Round Bar pricing based on size, quantity, grade, finish, and delivery requirements.
Why Choose Us
Euro Steel Bars is an international distributor, stockist and exporter of stainless round steel bars that cover carbon, stainless alloy, special grades. We stock a variety of sizes and grades. We guarantee every order with mill test certificates as well as full quality-assurance documentation. Our name speaks to our roots: European-sourced materials that is backed by the certificates and rigor that buyers from Asia as well as the Gulf and Africa are looking for.
Each bar we deliver is accompanied by EN 10204 3.1 mill test certificates as well as complete documentation of quality, so what you receive corresponds to what’s written in the documents. We carry a selection of sizes and grades ready for transport, and cut length upon the request of customers, which results in quicker lead times, whether you’re ordering just a one-off spec or a complete project tonnage.
We operate an actual wholesale business that is that is supported with an internationally-operated supply chain therefore we are able to serve fabricators sourcing one grade the same way in the same way as an EPC contractor who is placing a large order. Our clients include manufacturers, fabricators EPC construction companies, engineers oil and gas projects as well as construction companies. we design our inventory as well as documentation to show what buyers need to bring projects forward.
Our customers trust us across Qatar, Oman, Bahrain, Kuwait, Jordan, Malaysia, Singapore, Thailand, Taiwan, Turkey, Italy and South Africa. If you’re looking to source an Gulf energy project, or a construction project within Southeast Asia, you get the same quality of certified material, the exact documentation, and the exact delivery procedure.
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