Table of Contents
- Super Duplex Steel S32750 Washers Overview
- Technical Specifications
- Technical Properties & Chemical Composition
- Types of Super Duplex Steel S32750 Washers
- Key Technical Advantages
- Key Applications of Super Duplex Steel S32750 Washers
- Quality Testing & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
Super Duplex Steel S32750 Washers Suppliers & Exporters
If your subsea umbilical systems, marine desalination plants, or high-pressure chemical scrubbers face extreme localized pitting and crevice corrosion, you've reached the right source. As a leading Super Duplex Steel S32750 Washers Supplier and Super Duplex Steel S32750 Washers Exporter, Aurum Overseas manufactures precision Plain, Spring, Lock, Square, and Conical fasteners to ASME B18.21.1, DIN 125, and ISO 7089 standards.
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Our UNS S32750 Washers feature a 25% chromium alloy composition delivering an exceptionally high Pitting Resistance Equivalent Number (PREN 42 min) and 550 MPa proof strength. Complete with full EN 10204 3.1 MTR certifications, we maintain extensive stock of Super Duplex F53 Washers ready for rapid global dispatch.
Technical Specifications
| Parameter | Technical Specification / Standard Range |
|---|---|
| Material Grade | Super Duplex Steel S32750 (2507 Grade Family) |
| Forging Designation | ASTM A182 Grade F53 |
| UNS Designation | UNS S32750 |
| Manufacturing Standards | ASTM A240, ASME SA240, ASTM A182, ASME SA182 |
| Dimensional Specifications | ASME B18.21.1, DIN 125 A/B, DIN 127, DIN 9021, ISO 7089, ISO 7090 |
| Washer Types | Plain Washers, Spring Washers, Lock Washers, Square Washers, Conical Washers |
| Size Capability | Imperial: #4 to 4" NB | Metric: M3 to M100 |
| Thickness Range | 0.5 mm to 12 mm |
| Hardness Limit | 32 HRC max / 310 HB max |
Technical Properties & Chemical Composition
Equivalent Grades of UNS S32750 Washers
| STANDARD | WERKSTOFF NR. | UNS |
|---|---|---|
| Super Duplex Steel S32750 | 1.4410 | S32750 |
Chemical Composition of UNS S32750 Washers
| Element | Composition (%) |
|---|---|
| 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 Properties of UNS S32750 Washers
| Property | Metric Value | Imperial Value |
|---|---|---|
| Ultimate Tensile Strength | 750 MPa min | 116,000 psi min |
| Yield Strength (0.2% Proof Stress) | 550 MPa min | 80,000 psi min |
| Elongation (%) | 15% min | 15% min |
| Hardness (Rockwell C / Brinell) | 32 HRC max | 310 HB max |
| Density | 7.8 g/cm³ | 0.281 lb/in³ |
| Melting Point | 1350°C | 2460°F |
Types of Super Duplex Steel S32750 Washers
Aurum Overseas supplies a comprehensive range of super duplex steel washer configurations manufactured according to standard DIN, ASME, and ISO dimensional tolerances for multiple engineering assemblies.
Super Duplex Steel S32750 Plain Washers
Super Duplex Steel S32750 Spring Washers
Super Duplex Steel S32750 Lock Washers
Super Duplex Steel S32750 Square Washers
Super Duplex Steel S32750 Conical Washers
Key Technical Advantages
Extremely High PREN Rating (42 min)
High 25% Cr and 4% Mo fractions prevent pitting and crevice oxidation in warm stagnant seawater.
Superior Proof Strength
Yield strength of 550 MPa allows compact bolt sizing while accommodating high joint clamping preloads.
High Resistance to Stress Corrosion Cracking
Dual-phase ferrite-austenite matrix prevents transgranular cracking propagation under high stress.
Low Thermal Expansion Coefficient
Matches carbon steel thermal response more closely than standard austenitic grades, minimizing bolt loosening.
Key Applications of Super Duplex Steel S32750 Washers
| Industry Sector | Application | Operating Environment |
|---|---|---|
| Reverse Osmosis Desalination | High-pressure seawater pump casings, manifold flanges, and energy recovery devices | Concentrated high-velocity brine streams and continuous chloride exposure |
| Subsea Marine & Offshore | Subsea umbilical connection hardware, flowlines, and riser clamp bolting | Deep-water marine environments subject to high hydrostatic pressure |
| Chemical Processing | Sulphuric acid cooling systems, organic acid plants, and chlorination tanks | Highly concentrated acidic solutions and elevated temperatures |
| Pulp & Paper Bleaching | Chlorine dioxide bleaching towers, digester vessels, and washer drums | Harsh oxidising bleach liquors and acidic process chemicals |
| Marine Scrubber Systems | Exhaust gas cleaning scrubbers, discharge piping, and ductwork joints | Acidic marine exhaust condensate mixed with hot seawater spray |
Quality Testing & Inspection
As a certified Super Duplex Steel S32750 Washers Supplier, Aurum Overseas subjects all production batches to strict material quality control:
- Positive Material Identification (PMI): Spectrometric verification confirms precise chemical composition including Cr, Ni, Mo, and N fractions.
- Intergranular Corrosion Testing: ASTM A262 Practice E testing verifies immunity to intergranular chromium carbide precipitation.
- Pitting Resistance & Microstructure Audit: ASTM G48 Method A testing and metallographic evaluation confirm a balanced ferrite-austenite phase structure.
- Mechanical & Hardness Verification: Tensile and hardness testing guarantees compliance with 32 HRC maximum limits for severe service.
- Dimensional Conformance: Optical comparator inspections confirm exact tolerances against DIN, ISO, and ASME specifications.
Global Export Markets
Aurum Overseas supplies fully certified Super Duplex Steel S32750 Washers to industrial projects across:
USA
Canada
Mexico
Germany
United
Kingdom
France
Italy
Netherlands
Norway
UAE
Saudi
Arabia
Qatar
Kuwait
Oman
Singapore
Malaysia
Australia
Frequently Asked Questions
Grade 2507 contains higher chromium (25%) and molybdenum (4%), raising its PREN to 42 min compared to 2205's PREN of 34.
Continuous operating temperature should remain below 250°C (482°F) to avoid embrittlement from 475°C phase formation.
Yes. UNS S32750 washers satisfy NACE MR0175 / ISO 15156 requirements for severe H2S sour gas environments.
Yes. Their high yield strength (550 MPa min) prevents permanent deformation or yield under specified initial bolt loads.
Every shipment includes EN 10204 3.1 MTRs verifying chemical analysis, mechanical testing, hardness limits, and PMI checks.
Contact Aurum Overseas
Aurum Overseas provides rapid delivery of certified Super Duplex Steel S32750 Washers for high-specification global infrastructure.
Contact our sales engineering team for technical assistance, material certifications, and rapid pricing.