Table of Contents
- Super Duplex Steel S32750 Overview
- Technical Specifications
- Chemical Composition & Mechanical Properties
- Types of UNS S32750 Hex Bars
- Key Advantages of Super Duplex Steel S32750 Hex Bars
- Key Applications of Super Duplex Steel S32750 Hex Bars
- Quality Assurance & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
Super Duplex Steel S32750 Overview
Precision cold-drawing and solution annealing give UNS S32750 Hex Bars exact dimensional accuracy for high-speed CNC machining. Aurum Overseas is an established Super Duplex Steel S32750 Hex Bars Supplier, stocking high-precision hexagon stock engineered for severe marine and acidic processing environments.
As a trusted Super Duplex Steel S32750 Hex Bars Exporter, we stock precision Super Duplex S32750 Bright Hex Bars for CNC machining and heavy Super Duplex S32750 Forged Hex Bars for pressure-retaining hardware. Every bar is solution-annealed and supplied with EN 10204 3.1 mill test certificates.
We export certified Super Duplex Steel 2507 Hex Bars and Super Duplex Steel F53 Hex Bars directly to offshore platforms, subsea manifolds, chemical plants, and desalination units across the USA, Germany, UK, UAE, Saudi Arabia, and global markets.
Technical Specifications
| Technical Parameter | Specification Standard |
|---|---|
| Material Specifications | ASTM A276, ASTM A479, ASME SA276, ASME SA479, EN 10088-3 |
| UNS Designation | UNS S32750 (Dual Certified with Grade 2507 / F53) |
| Across-Flats (AF) Size Range | 6.0 mm to 100.0 mm (1/4" to 4" Hexagon) |
| Length Options | 1,000 mm to 6,000 mm, Precision Sawing Cut-to-Length |
| Surface Finishes | Cold Drawn, Centerless Ground, Bright Annealed, Hot Forged, Rough Machined |
| Heat Treatment Condition | Solution Annealed (1050 °C to 1120 °C, Water Quenched) |
| Dimensional Tolerances | ASTM A484 / ISO 286-2 (h9, h10, h11 hex profile tolerances) |
Chemical Composition & Mechanical Properties
Equivalent Standards
| UNS Designation | Werkstoff Nr. | EN Symbol | Common Name |
|---|---|---|---|
| S32750 | 1.4410 | X2CrNiMoN25-7-4 | SAF 2507 / F53 |
Chemical Composition (%)
| Element | Specification Range (UNS S32750) |
|---|---|
| Carbon (C) | 0.030 max |
| Manganese (Mn) | 1.20 max |
| Silicon (Si) | 0.80 max |
| Phosphorus (P) | 0.035 max |
| Sulfur (S) | 0.020 max |
| Chromium (Cr) | 24.00 – 26.00 |
| Molybdenum (Mo) | 3.00 – 5.00 |
| Nickel (Ni) | 6.00 – 8.00 |
| Nitrogen (N) | 0.24 – 0.32 |
| Iron (Fe) | 58.095 min |
Mechanical & Physical Properties
| Property Parameter | Value (Metric / Imperial) |
|---|---|
| Density | 7.80 g/cm³ (0.281 lb/in³) |
| Melting Point | 1350 °C (2460 °F) |
| Tensile Strength (Min) | 750 MPa (116,000 Psi) |
| Yield Strength (0.2% Offset, Min) | 550 MPa (80,000 Psi) |
| Elongation (Min) | 15 % |
| Hardness (Max) | 310 HBW / 32 HRC |
Types of UNS S32750 Hex Bars
Aurum Overseas supplies Super Duplex Steel S32750 (2507 / F53) hex bars in precision bright and heavy forged conditions for severe marine and acidic environments.
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Super Duplex S32750 Bright Hex Bars
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Super Duplex S32750 Forged Hex Bars
Key Advantages of Super Duplex Steel S32750 Hex Bars
Exceptional Strength
High 550 MPa yield strength allows for thinner, lighter, and more efficient component designs.
Stress Corrosion Immunity
Resists stress-related cracking in high-temperature, high-chloride environments up to 300 °C.
Superior Pitting Resistance (PREN ≥ 42)
High molybdenum and nitrogen content prevents localized pitting and crevice corrosion in stagnant seawater.
Wear & Erosion Protection
Exceptional mechanical hardness protects moving parts against physical wear and fluid erosion.
Key Applications of Super Duplex S32750 Hex Bars
| Industry | Applications | Operational Benefit |
|---|---|---|
| Subsea & Offshore | Subsea tree bolts, manifold tie rods, riser couplings | High strength and resistance to sour gas (H2S) and extreme underwater pressures. |
| Desalination Plants | RO pump shafts, energy recovery system fittings | High PREN rating prevents pitting corrosion in concentrated salt brine streams. |
| Chemical Processing | Acid valves, agitator shafts, threaded hex plugs | Long-term structural integrity under cyclic thermal and corrosive loads. |
| Marine Hardware | Propeller shafting bolts, rudder assembly fasteners | Superior fatigue resistance and durability in marine splash zones. |
Quality Assurance & Inspection
As a trusted Super Duplex Steel S32750 Hex Bars Exporter, every batch undergoes rigorous quality testing to meet strict international standards:
- Microstructure & Phase Balance: Tested per ASTM E562 to guarantee a 45–55% ferrite phase balance free of harmful sigma phases.
- Critical Pitting Temperature (CPT): Evaluated per ASTM G48 Method C to ensure superior pitting resistance in high-temperature environments.
- Positive Material Identification (PMI): 100% XRF chemical verification to confirm exact alloying elements (Cr, Mo, Ni, N).
- Ultrasonic Inspection (NDT): Tested per ASTM A388 to detect and prevent internal flaws, cracks, or inclusions.
Global Export Markets
As an established Super Duplex Steel S32750 Hex Bars Exporter, Aurum Overseas supplies fully certified UNS S32750 / 2507 / F53 Hex Bars to global subsea, desalination, and marine engineering centers:
USA
Canada
Mexico
Germany
United Kingdom
France
Italy
Netherlands
Belgium
Spain
Poland
UAE
Saudi Arabia
Qatar
Kuwait
Oman
Bahrain
Frequently Asked Questions
UNS S32205 is a 22% Cr duplex steel with a PREN of ~35, while UNS S32750 (2507) is a super duplex steel with 25% Cr, higher Mo/N content, a higher yield strength (550 MPa), and a PREN ≥ 42.
UNS S32750 hex bars are manufactured in accordance with ASTM A276 and ASTM A479 standards for structural, boiler, and pressure vessel applications.
Hexagonal profiles feature pre-formed parallel flat faces that eliminate extra milling steps when machining high-torque bolts, valve stems, and hydraulic couplings.
Yes, UNS S32750 offers good weldability using matching 2509 filler metals when heat input is controlled to preserve the 50/50 ferrite-austenite phase balance.
All orders from Aurum Overseas include certified EN 10204 3.1 Mill Test Certificates detailing heat numbers, chemical PMI, mechanical test values, and corrosion reports.
Contact Aurum Overseas
Partner with a premier Super Duplex Steel S32750 Hex Bars Supplier and Super Duplex Steel S32750 Hex Bars Exporter for certified stock, custom cut-to-length services, and prompt international delivery.