Super Duplex Stainless Steel 2507 Round Bar
➡️ Alloy 2507 | UNS S32750 | EN/DIN 1.4410 | ASTM A182 Grade F53 | AF 2507, UR 2507, NAS 74N
➡️ 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:
S32750
Wr. No.:
1.4410
MTC Available:
EN 10204 3.1
Product Description for Super Duplex Stainless Steel 2507 Round Bar
2507 Super Duplex Round Bar is a super duplex (austenitic-ferritic) stainless steel bar produced to UNS S32750, EN 1.4410 (X2CrNiMoN25-7-4), and equivalent national standards. It is supplied hot rolled or forged, solution annealed at approximately 1050–1125°C, and rapidly water quenched to produce a balanced two-phase microstructure of roughly 35–55% ferrite and the remainder austenite. This structure is what gives duplex grades their combination of high strength and corrosion resistance relative to standard austenitic stainless steels.
The alloy’s high chromium (24–26%), molybdenum (3–5%) and nitrogen (0.24–0.32%) content produces a Pitting Resistance Equivalent (PREN = %Cr + 3.3×%Mo + 16×%N) of 40 or higher, placing it in the “super duplex” category. This gives excellent resistance to pitting, crevice corrosion and chloride stress corrosion cracking, along with mechanical strength roughly double that of standard 300-series austenitic bar in the annealed condition.
2507 round bar is manufactured to ASTM A276 (bars and shapes) and ASTM A479 (bars for boilers and pressure vessels), with EN 10088-3 covering the equivalent European bar specification. It is commonly supplied in solution-annealed, peel-turned or machined condition, and is listed under NACE MR0175 / ISO 15156 for sour (H₂S-containing) service.
Typical applications include subsea and topside oil and gas equipment, seawater-handling pumps and valves, desalination plant components, chemical processing equipment, and other applications where 316L or standard duplex 2205 do not provide sufficient corrosion resistance or strength. Purchasers should confirm the required product standard (A276 vs A479 vs EN 10088-3), diameter-dependent mechanical property requirements, heat treatment condition, and any supplementary requirements such as NACE compliance, impact testing temperature, or third-party material certification (EN 10204 3.1 or 3.2) before ordering.
Common Applications of Super Duplex Stainless Steel 2507 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 2507 Round Bar
Standard
Country / Region
Grade
UNS
USA
UNS S32750
ASTM / AISI / SAE
USA
ASTM A276, A479 / ASTM A182 Grade F53
JIS
Japan
SUS329J4L
EN
Europe
1.4410 / X2CrNiMoN25-7-4
BS
United Kingdom
BS EN 10088-3 / 1.4410
GB / GB/T
China
022Cr25Ni7Mo4N
KS
South Korea
STS329J4L
Technical Specification for Super Duplex Stainless Steel 2507 Round Bar
Specification
Value
Unit
Material
Super duplex stainless steel
-
Grade
UNS S32750 / EN 1.4410 (2507)
-
Standard
ASTM A276 / A479; EN 10088-3
-
Product Form
Round bar (hot rolled, forged, or peel-turned)
-
Diameter
6-500
mm
Length
3-7
m
Manufacturing Process
Hot rolled or forged, then solution annealed and water quenched
-
Surface Finish
Black hot-rolled, peeled/turned, or machined bright
-
Heat Treatment
Solution annealed at approx. 1050–1125°C, water quenched
°C
Delivery Condition
Solution annealed and quenched (Condition A per ASTM A276)
-
Tolerance Standard
ASTM A484 / A480 (general requirements) or EN 10060 / EN 10278
-
Dimensional Tolerance
Standard mill tolerance per governing standard; confirm per diameter and finish
mm
Straightness
Typically ≤2 mm/m for larger diameters (producer-dependent)
mm/m
Carbon Equivalent (CEV)
Not applicable
-
Density
7.80 (0.282)
g/cm³ (lb/in³)
Magnetic Properties
Moderately magnetic
-
Corrosion Resistance
PREN (%Cr + 3.3×%Mo + 16×%N) minimum 40; excellent resistance to pitting, crevice corrosion and chloride SCC
-
Thermal Conductivity
14 (at 20°C)
W/(m·K)
Electrical Resistivity / Conductivity
0.83 (at 20°C)
µΩ·m
Specific Heat
490 (at 20°C)
J/(kg·K)
Coefficient of Thermal Expansion
13.5 (30–100°C, mean)
×10⁻⁶/°C
Melting Range
1410–1460 (2570–2660)
°C (°F)
Technical Specifications
Get the key technical specifications for Super Duplex Stainless Steel 2507 Round Bar
2507 round bar is normally ordered against ASTM A276 (general bar/shapes) or ASTM A479 (bar intended for pressure-retaining/boiler applications); the two standards carry the same nominal chemistry but differ in supplementary testing and certification requirements, so the purchase order should state which standard governs. Delivery condition is solution annealed and water quenched this is essential, since it dissolves intermetallic phases and sets the 35–55% ferrite balance that gives the grade its corrosion resistance; the bar should never be supplied or used in the as-hot-worked (non-annealed) condition.
Mechanical properties, particularly yield strength, can vary with bar diameter under ASTM A276 Table 2, so the applicable size bracket must be checked against the certificate. Surface condition ranges from black hot-rolled to peeled or machined bright bar; peeled bar is typical for large-diameter stock intended for further machining. Impact toughness (Charpy V-notch) is not mandated by base ASTM A276 but is commonly specified as a supplementary requirement for offshore or sour-service orders, often tested at −46°C or lower.
Buyers specifying NACE MR0175/ISO 15156 compliance for sour service should confirm hardness is controlled within the sour-service limit in addition to the base standard’s hardness ceiling.
Chemical Composition for Super Duplex Stainless Steel 2507 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
5.00
%
Manganese
Mn
-
1.20
%
Silicon
Si
-
0.80
%
Phosphorus
P
-
0.035
%
Sulfur
S
-
0.020
%
Nitrogen
N
0.24
0.32
%
Copper
Cu
-
0.50
%
Iron
Fe
Balance
Balance
%
Chemical Composition
View the chemical composition and applicable material limits for Alloy 2507 Round Bar
Chromium and molybdenum are the primary passive-film formers responsible for 2507’s resistance to chloride pitting and crevice corrosion, while nitrogen is deliberately alloyed at 0.24–0.32% both to boost pitting resistance disproportionately to its concentration and to strengthen and stabilize the austenite phase, offsetting the tendency of high-chromium/high-molybdenum duplex steels to form excess ferrite.
The combined effect is captured by the PREN formula, and the 40-minimum requirement is what distinguishes “super duplex” grades like 2507 from standard duplex grades such as 2205 (PREN ~35). Nickel content (6–8%) is lower than in comparable austenitic grades because its role here is primarily to balance the ferrite/austenite ratio near 50/50 rather than to carry corrosion resistance. Carbon is held very low (0.030% max) to minimize the risk of chromium carbide precipitation at grain boundaries during welding or improper heat treatment, which would otherwise cause sensitization and localized corrosion.
Manganese and silicon are largely residual/deoxidation elements, controlled to avoid promoting unwanted intermetallic (sigma) phase formation. Because duplex grades are more susceptible than austenitic grades to embrittling intermetallic phases if held too long in the 600–1000°C range, both alloy design and subsequent thermal processing (welding, hot forming) require closer control than for conventional austenitic stainless steels.
Mechanical Properties for Super Duplex Stainless Steel 2507 Round Bar
Mechanical Property
Value
Unit
Tensile Strength (min, ASTM A276, ≤50.8 mm dia.)
800
MPa
Yield Strength / 0.2% Proof Strength (min)
550
MPa
Elongation (min, ASTM A276 baseline)
15
%
Elongation (typical producer guarantee, e.g. Alleima SAF 2507)
≥25
%
Reduction of Area (min, typical)
25
%
Hardness (max, ASTM A276)
310 HBW / 32
HBW / HRC
Hardness
28 max
HRC
Impact Energy, Charpy V-notch (typical, at 20°C, large-diameter bar)
≥100 avg / 70 min single
J
Impact Energy, Charpy V-notch (typical, at −50°C, large-diameter bar)
≥45 avg / 35 min single
J
Mechanical Properties
Check the key mechanical properties and performance requirements of Alloy 2507 Round Bar
2507’s 550 MPa minimum yield strength is roughly double that of annealed 316L (min. 170 MPa), which allows designers to reduce section size and weight for a given load-bearing requirement a common justification for specifying this grade over standard austenitic stainless in structural and pressure-containing components.
The relatively high elongation (typically ≥25% in practice, versus a 15% ASTM floor) and good Charpy impact values, including at sub-zero temperatures, reflect the austenite phase’s ductility and toughness, which balances the strength contributed by the ferrite phase; this combination is what allows duplex bar to be used in cold marine and subsea environments without the brittle-fracture concerns associated with plain ferritic stainless steels.
The controlled maximum hardness (310 HBW under ASTM A276, often tightened to 28 HRC / ~270 HB or lower for NACE MR0175 sour-service compliance) is a corrosion-related limit, not primarily a wear consideration: excessive hardness in duplex stainless correlates with increased susceptibility to sulfide stress cracking in H₂S-containing service.
For machining, the same high strength and work-hardening behavior that gives 2507 its mechanical advantage also increases cutting forces and tool wear relative to 316L, so slower speeds, rigid setups, and sharp, positive-rake tooling are typically recommended.
Dimension / Sizes for Super Duplex Stainless Steel 2507 Round Bar
Dimension / Size
Value
Unit
Diameter
Small to large diameter round bar; specific stock range varies by mill (confirm current availability)
mm
Standard Length
Random mill lengths, commonly 3,000–7,000
mm
Custom Length
Cut-to-length available on request
mm
Diameter Tolerance
Per standard (e.g., EN 10060 or ASTM A484); tighter tolerance available as a special order
mm
Length Tolerance
Per standard / customer specification
mm
Straightness Tolerance
Typically ≤2 mm/m for larger stock diameters (producer-dependent)
mm/m
End Condition
As-cut (saw cut); chamfered or center-drilled on request
-
Surface Finish
Hot rolled (black), 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 2507 Round Bar
Pricing for Super Duplex Stainless Steel 2507 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 2507 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
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