Super Duplex Stainless Steel Zeron 100 Round Bar
➡️ Alloy 32760 | Zeron 100 Super Duplex | UNS S32760 | EN/DIN 1.4501
➡️ ASTM, EN, JIS & International Standards
➡️ Supply Conditions
➡️ Multiple Diameters & Supply Lengths
➡️ Global Export & International Delivery
Country of Origin:
Europe, Japan, USA
Material Type:
Super Duplex Stainless Steel
UNS Number:
S32760
Wr. No.:
1.4501
MTC Available:
EN 10204 3.1
Product Description for Super Duplex Stainless Steel Zeron 100 Round Bar
ZERON® 100 is a tungsten- and copper-bearing super duplex (austenitic-ferritic) stainless steel round bar covered by UNS S32760 and EN 1.4501 (X2CrNiMoCuWN25-7-4). ZERON 100 is a registered trademark now held by Rolled Alloys, Inc. (formerly developed by Weir Materials, originating from earlier work by Mather + Platt); the underlying UNS S32760 chemistry is also produced by other mills under generic “Alloy 32760” or similar designations.
Zeron 100 shares the same base 25% chromium, 7% nickel, 3.5–4% molybdenum core chemistry as 2507 (UNS S32750), but adds deliberate tungsten (0.5–1.0%) and copper (0.5–1.0%) alloying. The tungsten addition is claimed by the producer to selectively enhance localized (pitting and crevice) corrosion resistance, while the copper addition improves resistance to reducing acid environments relative to tungsten-free duplex grades, though to a lesser degree than the higher-copper Ferralium 255. The alloy carries a guaranteed minimum Pitting Resistance Equivalent (PREN = %Cr + 3.3×%Mo + 16×%N) of 40, placing it firmly in the super duplex category alongside 2507 and Ferralium 255.
Zeron 100 round bar is supplied solution annealed and rapidly quenched to develop a balanced ferritic-austenitic microstructure (nominally 50:50). It is produced to ASTM A276 (bars/shapes) and ASTM A479 (bars for pressure vessels), with ASTM A182 Grade F55 covering the equivalent forged product form, and EN 10088-3 as the corresponding European bar standard. Zeron 100 is listed under NACE MR0175 / ISO 15156 for sour (H₂S) service and is referenced in NORSOK MDS specifications used widely in the offshore oil and gas sector.
Typical applications include subsea manifolds and pipework, wireline and umbilical tubing components, seawater reverse-osmosis desalination equipment, flue gas desulfurization systems, and sulfuric acid plant equipment. Because the alloy loses toughness with extended exposure above roughly 300°C (572°F), and because tensile/hardness limits can be size-dependent, buyers should confirm the governing product standard, service temperature range, and any NACE hardness restriction before ordering.
Common Applications of Super Duplex Stainless Steel Zeron 100 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 32760 Round Bar
UNS
USA
UNS S32760
ASTM / AISI / SAE
USA
ASTM A276, A314, A473, A479, A815
ASTM
USA
ASTM A1082
ASTM
USA
ASTM A182 Grade F55
EN
Europe
1.4501 / X2CrNiMoCuWN25-7-4
BS
United Kingdom
BS EN 10088-3 / 1.4501
Technical Specification for Super Duplex Stainless Steel Zeron 100 Round Bar
Specification
Value
Unit
Material
Tungsten/copper-bearing super duplex stainless steel
-
Grade
UNS S32760 / EN 1.4501 (ZERON 100)
-
Standard
ASTM A276 / A314 / A473 / A479 / A815; EN 10088-3
-
Product Form
Round bar (hot rolled or forged, solution annealed)
-
Diameter
Producer-dependent; commonly available from small diameters up to several hundred mm, confirm current stock range
mm
Length
Random mill lengths; cut lengths available on request
m
Manufacturing Process
Hot rolled or forged, then solution annealed and water quenched
-
Surface Finish
Black hot-rolled/forged, peeled, or machined bright
-
Heat Treatment
Solution annealed and rapidly quenched
°C
Delivery Condition
Solution annealed and quenched
-
Tolerance Standard
ASTM A484 / A480 or EN 10060 / EN 10278
-
Dimensional Tolerance
Per standard; confirm per diameter and finish
mm
Straightness
Per standard / producer specification
mm/m
Carbon Equivalent (CEV)
Not applicable
-
Density
7.84 (0.283)
g/cm³ (lb/in³)
Magnetic Properties
Moderately magnetic (ferromagnetic ferrite phase, nominally ~50% by volume in the duplex microstructure)
-
-
Guaranteed minimum PREN of 40 (%Cr + 3.3×%Mo + 16×%N); excellent resistance to chloride pitting, crevice corrosion, and stress corrosion cracking; enhanced resistance to sulfuric acid versus tungsten-free duplex grades
-
Thermal Conductivity
Approx. 13-18
W/(m·K)
Electrical Resistivity / Conductivity
0.85 (at 20°C)
µΩ·m
Coefficient of Thermal Expansion
Approx. 12.6–13.9
×10⁻⁶/°C
Melting Range
1377–1454 (2510–2650)
°C (°F)
Technical Specifications
Get the key technical specifications for Super Duplex Stainless Steel Zeron 100 Round Bar
Zeron 100 round bar is ordered to ASTM A276 or A314 for general bar/shapes use, or ASTM A479 where the bar is intended for a pressure-retaining application; the forged equivalent is covered by ASTM A182 Grade F55. All product forms require solution annealing and rapid quenching after hot working, since this dissolves intermetallic phases formed during hot deformation and establishes the balanced ferrite/austenite microstructure that gives the alloy its corrosion resistance bar must never be placed into service in the un-annealed, as-hot-worked condition. The producer (Rolled Alloys) publishes a guaranteed minimum PREN of 40 for Zeron 100, which is generally tighter than the calculated minimum implied by the bare compositional ranges alone, reflecting in-house melt-chemistry control beyond the base ASTM/EN specification. Zeron 100 is not recommended for continuous service above approximately 300°C (572°F), since extended exposure in this range promotes intermetallic (sigma) phase precipitation, substantially reducing toughness even though the material may still meet short-term strength requirements at that temperature. For sour-service (NACE MR0175 / ISO 15156) orders, hardness must be verified against the sour-service limit, which is typically more restrictive than the general ASTM A276 hardness ceiling. Welding should use ZERON 100X (or an equivalent matching duplex) filler metal to preserve the phase balance and corrosion performance of the weld metal.
Chemical Composition for Super Duplex Stainless Steel Zeron 100 Round Bar
Element
Symbol
Min
Max
Unit
Carbon
C
-
0.030
%
Chromium
Cr
24.00
26.00
%
Nickel
Ni
6.00
8.00
%
Molybdenum
Mo
3.00
4.00
%
Manganese
Mn
-
1.00
%
Silicon
Si
-
1.00
%
Phosphorus
P
-
0.030
%
Sulfur
S
-
0.010
%
Nitrogen
N
0.20
0.30
%
Copper
Cu
0.50
1.00
%
Tungsten
W
0.50
1.00
%
Iron
Fe
Balance
Balance
%
Chemical Composition
View the chemical composition and applicable material limits for Alloy 32760 Round Bar
Zeron 100’s chemistry builds on the same chromium-molybdenum-nitrogen base that gives 2507 its chloride pitting resistance, then adds two further alloying elements not present in 2507: tungsten (0.5–1.0%) and copper (0.5–1.0%).
Tungsten behaves similarly to molybdenum in stabilizing the passive film against localized attack and is reported by the producer to give a selective improvement in pitting and crevice corrosion resistance beyond what the PREN formula (which does not account for tungsten) alone would predict meaning two grades with an identical calculated PREN can perform differently if one contains tungsten and the other does not.
The copper addition, while smaller than in Ferralium 255 (0.5–1.0% versus 1.5–2.5%), still measurably improves resistance to non-oxidizing/reducing acids such as dilute sulfuric acid relative to copper-free super duplex grades. Nitrogen (0.20–0.30%) performs its usual dual role of boosting pitting resistance and stabilizing/strengthening the austenite phase to maintain the ferrite/austenite balance despite the high chromium and molybdenum content.
As with other super duplex grades, carbon is held low (0.030% max) to minimize sensitization risk during welding, and manganese/silicon are controlled primarily as residual/deoxidation elements rather than deliberate corrosion-resistance alloying additions.
Mechanical Properties for Super Duplex Stainless Steel Zeron 100 Round Bar
Mechanical Property
Value
Unit
Tensile Strength
750
MPa
Yield Strength / 0.2% Proof Strength
550
MPa
Elongation
25
%
Reduction of Area
25
%
Hardness
310
HBW
Impact / Charpy Properties
Producer typically guarantees good Charpy V-notch toughness at ambient and sub-zero temperature; specific minimum energy should be agreed as a supplementary requirement
J
Proof Stress / 0.2% Proof Strength
552
MPa
Ultimate Tensile Strength
751
MPa
Mechanical Properties
Check the key mechanical properties and performance requirements of Alloy 32760 Round Bar
Zeron 100’s 550 MPa minimum yield strength roughly twice that of annealed 316L supports the same section-size and weight reduction benefits common to the super duplex family, which is a major reason it is specified for offshore structural, piping, and pressure-containing components where both strength and corrosion resistance are required simultaneously. The 25% minimum elongation and the alloy’s generally good Charpy impact performance, including in cold and sub-zero service (a requirement in many offshore and Arctic/North Sea specifications), reflect the toughness contribution of the austenite phase balancing the harder, more brittle ferrite phase. As with other super duplex grades, this toughness advantage is temperature-limited: prolonged service above roughly 300°C promotes embrittling intermetallic phases and reduces impact toughness even though short-term strength may remain acceptable, so continuous high-temperature service should be avoided. The controlled maximum hardness (310 HBW under current ASTM A276, tightened further for NACE MR0175 sour-service qualification) is primarily a safeguard against sulfide stress cracking in H₂S service rather than a wear-resistance specification. Machinability is broadly similar to other super duplex grades high strength and work-hardening behavior require slower cutting speeds, rigid setups, and appropriate tooling compared with standard austenitic stainless steel.
Dimension / Sizes for Super Duplex Stainless Steel Zeron 100 Round Bar
Dimension / Size
Value
Unit
Diameter
Producer-dependent; small to large diameter bar generally available, confirm current stock range
mm
Standard Length
Random mill lengths; typically several meters
m
Custom Length
Cut-to-length available on request
mm
Diameter Tolerance
Per standard (e.g., ASTM A484 or EN 10060); confirm with supplier
mm
Length Tolerance
Per standard / customer specification
mm
Straightness Tolerance
Per standard / producer specification
mm/m
End Condition
As-cut (saw cut); chamfered on request
-
Surface Finish
Black hot-rolled/forged, peeled, or machined bright
-
Out-of-Roundness
Per dimensional standard
mm
Ovality
Per dimensional standard
mm
Dimensions & Sizes
Explore available diameters, lengths, and dimensional requirements for Alloy 32760 Round Bar
Pricing for Super Duplex Stainless Steel Zeron 100 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 Super Duplex Stainless Steel Zeron 100 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.
Frequently Asked Questions
What is Zeron 100?
What standard does Zeron 100 round bar comply with?
What are Zeron 100's international equivalent grades?
What is the difference between Zeron 100 (S32760) and 2507 (S32750)?
What heat treatment condition is Zeron 100 round bar supplied in?
Is Zeron 100 suitable for welding?
What is Zeron 100's corrosion resistance?
Can custom sizes or lengths be supplied?
Request A Quote
Need a specific grade, size or quantity? Get pricing and availability for your requirement.