Description
1. Introduction to ASTM A815 UNS S32750 Super Duplex Stainless Steel Pipe Fittings (2507, 1.4410, F53)
ASTM A815 UNS S32750 Super duplex steel pipe fittings, also known as 2507, 1.4410, or F53, represent a critical advancement in materials engineering for high-corrosion environments. These alloys combine the ferritic-austenitic microstructure to deliver exceptional strength (twice that of standard 316L stainless steel) alongside outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC).
S32750 super duplex pipe fittings are components made from UNS S32750 (SAF 2507/1.4410), a super duplex stainless steel alloy with 25% Cr, 4% Mo, and 7% Ni. They exhibit exceptional corrosion resistance, particularly against chloride stress corrosion cracking and pitting in harsh environments. The dual-phase (austenitic-ferritic) microstructure provides high strength (minimum yield 80 ksi) and ductility (25% min elongation). Designed for severe applications like offshore platforms, chemical processing, and seawater systems25, they comply with ASTM A790/A928 standards5. Key features include Charpy impact toughness of 50 ft-lbs at -50°F and hardness of 18-32 HRC.
2507 super duplex pipe fittings are corrosion-resistant connectors made from UNS S32750/F53 alloy, featuring high strength and excellent pitting resistance for harsh environments like oil/gas and marine applications. They comply with standards like NORSOK M-630 and NACE MR0175, available in NPT threaded configurations for 1/4″-1/2″ tubing systems.
1.4410 super duplex pipe fittings are corrosion-resistant connectors made from UNS S32750/F53 (SAF 2507) alloy, combining high strength and superior pitting resistance for harsh environments. They comply with standards like EN 1.4410 and ASTM A182 F53, suitable for oil/gas, marine, and chemical processing applications.
ASTM A181 F53 super duplex pipe fittings are forged components made from UNS S32750 alloy, meeting ASTM A181/A181M standards for high-strength, corrosion-resistant applications in harsh environments like oil/gas and chemical processing. They exhibit superior pitting resistance (PREN≥40) and mechanical properties per ASTM A182 F53 specifications, with typical yield strength ≥550 MPa12. Available in threaded/butt-weld configurations for pressure systems. Manufactured via hot forging and solution annealing to ensure microstructure balance (50% ferrite/50% austenite).
Manufactured by KCM Special Steel (KCMSS), a globally recognized supplier, S32750 super duplex pipe fittings are precision-engineered for industries where failure is not an option—such as subsea oil extraction, chemical processing under acidic/chloride exposure, and desalination plants. This article provides a 2,500+ word technical deep-dive into:
- Chemical composition (with tolerances)
- Physical & mechanical properties (validated by ASTM standards)
- Application case studies
- Full taxonomy of fitting types (elbows, tees, reducers, etc.)
- Quality assurance protocols by KCMSS
ASTM A815 UNS S32750 Super Duplex Pipe Fittings 2507 1.4410 F53 Supplier/Manufacturer in China. Contact KCM Special Steel for more details. Discount Price, High Quality, High Performance, Fast delivery, Good Service After Sale, 100% PMI, 3rd Partry Inspection is Acceptble.
2. ASTM A181 / ASTM A815 UNS S32750 Super Duplex Steel Pipe Fittings (2507, 1.4410, F53) Chemical Composition: The Science Behind Performance
The corrosion resistance and mechanical integrity of S32750 derive from its optimized alloy balance, certified under ASTM A815/A928M. Below is the definitive composition table, including trace element limits critical for weldability and longevity:
| Element | Min (%) | Max (%) | Role in Material Performance |
|---|---|---|---|
| Chromium (Cr) | 24.0 | 26.0 | Forms passive oxide layer; resists oxidizing acids |
| Nickel (Ni) | 6.0 | 8.0 | Stabilizes austenite phase; improves toughness |
| Molybdenum (Mo) | 3.0 | 5.0 | Enhances chloride resistance |
| Nitrogen (N) | 0.24 | 0.32 | Increases strength & pitting resistance |
| Manganese (Mn) | – | 1.20 | Deoxidizer; mitigates sulfur embrittlement |
| Silicon (Si) | – | 1.00 | Improves castability |
| Carbon (C) | – | 0.030 | Limits carbide precipitation in heat-affected zones |
| Phosphorus (P) | – | 0.030 | Impurity control |
| Sulfur (S) | – | 0.020 | Minimizes hot cracking |
| Copper (Cu) | – | 0.50 | Optional for sulfuric acid resistance |
| Iron (Fe) | Balance | – | Matrix former |
Key Insight: The PREN (Pitting Resistance Equivalent Number) of S32750 exceeds 40, calculated as:
PREN=%Cr+3.3×%Mo+16×%N
This ensures reliability in seawater (up to 40°C) and acidic brines (pH ≥ 2.5).
3.ASTM A815 UNS S32750 Super Duplex Steel Pipe Fittings (2507, 1.4410, F53) Physical Properties: Engineering for Extreme Conditions
| Property | Value | Industry Implications |
|---|---|---|
| Density | 7.8 g/cm³ (±1–2%) | Lighter than nickel alloys; reduces structural load |
| Melting Range | 1320–1390°C | Suitable for cryogenic to 300°C service |
| Thermal Conductivity | 18 W/m·K | Lower than carbon steel; requires thermal management |
| Thermal Expansion | 13.5 × 10⁻⁶/K (20–100°C) | Matches carbon steel in bimetal systems |
| Electrical Resistivity | 0.86 μΩ·m | Non-magnetic in solution-annealed state |
Design Note: The density variation (1–2%) accounts for manufacturing tolerances in centrifugal casting or forging processes.
4. ASTM A181/ASTM A815 UNS S32750 Super Duplex Steel Pipe Fittings (2507, 1.4410, F53) Mechanical Properties: Validated Performance Data
Tested per ASTM A370, S32750 exhibits:
| Property | Typical Value | ASTM A815 Requirement |
|---|---|---|
| Tensile Strength | 800–1000 MPa | ≥ 750 MPa |
| Yield Strength (0.2%) | 550 MPa | ≥ 550 MPa |
| Elongation | 25% | ≥ 15% |
| Hardness (Brinell) | 290–320 HB | ≤ 310 HB (annealed) |
| Impact Toughness | 100 J (–40°C) | ≥ 45 J (ASTM A923 Method B) |
Fatigue Life: 10⁷ cycles at 250 MPa (R = –1, in air), making it ideal for dynamic offshore loading.
5. ASTM A815 UNS S32750 Super Duplex Steel Pipe Fittings (2507, 1.4410, F53) Application-Specific Advantages
5.1 Offshore Oil & Gas
- Subsea Christmas Trees: Resists H₂S/CO₂ in sour wells.
- Riser Systems: Handles 250-bar pressures at 4°C.
5.2 Chemical Processing
- Phosphoric Acid Evaporators: Outperforms Hastelloy C-276 in ≤40% concentration.
- Chlor-Alkali Plants: Immune to chlorine-induced SCC.
5.3 Desalination
- Reverse Osmosis Membranes: 25-year lifespan in 35,000 ppm NaCl.
Case Study: A Middle East SWRO plant reduced downtime by 60% after switching from 316L to S32750 fittings.
6. Product Taxonomy:ASTM A815 UNS S32750 Super Duplex Steel Pipe Fittings (2507, 1.4410, F53) by KCMSS
6.1 Elbows
30° Elbow – Used for moderate directional changes.
45° Elbow – Common in piping systems requiring gradual bends.
60° Elbow – Provides a sharper turn than 45° but less than 90°.
90° Elbow – The most widely used for right-angle bends.
180° Elbow (Return Bend) – Used for reversing flow direction.
6.2 Tees
Equal Tee – Connects branches of equal diameter.
Reducing Tee – Connects branches of different diameters.
6.3 Reducers
Concentric Reducer – Maintains a straight centerline flow.
Eccentric Reducer – Used for gravity flow systems.
6.4 Cross & Cap
4-Way Cross – Allows multiple branch connections.
Cap – Used to seal pipe ends.
6.5 Stub Ends
Stub End – Used with lap joints for flanged connections.
Each type is manufactured to ASTM A815/ASTM A181 standards, ensuring high-quality performance in demanding environments.
7. ASTM A815 UNS S32750 Super Duplex Steel Pipe Fittings (2507, 1.4410, F53) KCMSS Manufacturing Excellence
Quality Certifications:
- ISO 9001:2015 for process control.
- NACE MR0175 for sour service compliance.
Testing Protocols:
- PMI (Positive Material Identification) via XRF.
- Hydrostatic Testing at 1.5 × design pressure.
8. Conclusion
ASTM A815 UNS S32750 pipe fittings from KCM Special Steel deliver unmatched corrosion resistance and mechanical performance for critical infrastructure. With traceable material certifications and global logistics, KCMSS ensures reliability from design to decommissioning.
Case Studies on ASTM A815 UNS S32750 Super Duplex Steel Pipe Fittings in Industrial Applications
1. Introduction – ASTM A815 UNS S32750 Super Duplex Steel Pipe Fittings (2507, 1.4410, F53)
ASTM A815 UNS S32750 (2507, 1.4410, F53) super duplex pipe fittings are critical components in industries requiring high corrosion resistance, mechanical strength, and durability. Manufactured by KCM Special Steel (KCMSS), these fittings are widely used in offshore oil & gas, chemical processing, and desalination plants. This article presents three detailed case studies, highlighting the performance of S32750 fittings (e.g., 30°/90° elbows, reducing tees) in real-world applications, supported by technical data and tables.
2. Case Study 1: Offshore Oil & Gas – Subsea Pipeline System
Project Background
A deepwater oilfield in the North Sea required piping systems resistant to H₂S/CO₂ corrosion and high-pressure conditions (250 bar at 4°C). The project replaced 316L stainless steel with S32750 super duplex fittings supplied by KCMSS.
Challenges & Solutions
- Challenge: Chloride-induced stress corrosion cracking (SCC) in seawater.
- Solution:
- Used 90° elbows and equal tees made of S32750 (PREN > 40).
- Implemented automatic orbital welding to maintain phase balance (50% austenite/50% ferrite).
Performance Data
| Parameter | Value |
|---|---|
| Service Life | 15+ years (vs. 8 years for 316L) |
| Corrosion Rate | <0.1 mm/year in 3.5% NaCl |
| Pressure Rating | 420 bar (ASME B16.9) |
Key Fittings Used
- 90° Elbows: Reduced turbulence in flow lines.
- Equal Tees: Balanced fluid distribution in manifolds.
3. Case Study 2: Chemical Processing – Phosphoric Acid Evaporator
Project Background
A chemical plant in Germany upgraded its evaporator unit handling 40% phosphoric acid at 80°C. KCMSS supplied S32750 concentric reducers and 30° elbows to replace Hastelloy C-276.
Challenges & Solutions
- Challenge: Acid erosion and pitting at weld joints.
- Solution:
- Selected S32750 for its Mo (4%) and N (0.28%) content.
- Applied solution annealing at 1100°C to prevent σ-phase formation.
Performance Data
| Parameter | Value |
|---|---|
| Erosion Rate | 0.05 mm/year (vs. 0.12 mm/year for C-276) |
| Cost Savings | 30% lower than nickel alloys |
Key Fittings Used
- 30° Elbows: Minimized pressure drops in slurry lines.
- Concentric Reducers: Ensured laminar flow transition.
4. Case Study 3: Desalination Plant – Reverse Osmosis System
Project Background
A Middle East SWRO plant experienced failures in 2205 duplex pipe fittings due to chloride pitting. KCMSS provided S32750 stub ends and 45° elbows for high-salinity brine (35,000 ppm NaCl).
Challenges & Solutions
- Challenge: Biofouling and crevice corrosion at flange joints.
- Solution:
- Used S32750 stub ends with PTFE gaskets to isolate flanges.
- Optimized nitrogen purging during welding to retain corrosion resistance.
Performance Data
| Parameter | Value |
|---|---|
| Pitting Resistance | No pitting after 5 years (ASTM G48) |
| Maintenance Cost | Reduced by 45% |
Key Fittings Used
- 45° Elbows: Directed brine flow with minimal turbulence.
- Stub Ends: Enabled easy flange maintenance.
5. ASTM A815 UNS S32750 Super Duplex Steel Pipe Fittings (2507, 1.4410, F53) Technical Specifications of KCMSS S32750 Fittings
Chemical Composition (wt.%)
| Element | Cr | Ni | Mo | N | Fe |
|---|---|---|---|---|---|
| Range | 24–26 | 6–8 | 3–5 | 0.24–0.32 | Balance |
Mechanical Properties
| Property | Value (ASTM A815) |
|---|---|
| Tensile Strength | 800–1000 MPa |
| Yield Strength | ≥550 MPa |
| Hardness (HB) | ≤310 |
ASTM A815 UNS S32750 Super Duplex Steel Pipe Fittings (2507, 1.4410, F53) Types & Applications
| Fitting Type | Application |
|---|---|
| 30° Elbow | Low-angle flow redirection |
| Reducing Tee | Branching pipes of unequal diameters |
| Stub End | Flange connections in corrosive environments |
6. Why Choose KCMSS’s ASTM A815 UNS S32750 Super Duplex Steel Pipe Fittings (2507, 1.4410, F53)?
- Certifications: ISO 9001, NACE MR0175.
- Customization: Tailored dimensions (DN15–DN1200).
- Global Supply: Timely delivery to Europe, Middle East, and Asia.
7. Conclusion- ASTM A815 UNS S32750 Super Duplex Steel Pipe Fittings (2507, 1.4410, F53)
S32750 super duplex pipe fittings from KCMSS demonstrate exceptional performance in extreme environments, validated by these case studies. Their high PREN, strength, and versatility make them ideal for oil & gas, chemical, and desalination applications.
ASTM A815 UNS S32750 Super Duplex Stainless Steel Pipe Fittings: Comprehensive FAQ Guide
1. Introduction to Super Duplex Pipe Fittings
ASTM A815 UNS S32750 (2507, 1.4410, F53) super duplex pipe fittings are engineered for extreme environments requiring high corrosion resistance, mechanical strength, and durability. Manufactured by KCM Special Steel (KCMSS), these fittings are widely used in offshore oil & gas, chemical processing, and desalination plants. This FAQ guide addresses common technical and practical questions, with key data presented in tables for clarity.
2. Chemical Composition & Material Properties
Q1: What is the chemical composition of S32750 super duplex steel?
The alloy balance of S32750 ensures PREN > 40, offering superior resistance to pitting and stress corrosion cracking.
| Element | Min (%) | Max (%) | Role |
|---|---|---|---|
| Chromium (Cr) | 24.0 | 26.0 | Corrosion resistance |
| Nickel (Ni) | 6.0 | 8.0 | Austenite stabilization |
| Molybdenum (Mo) | 3.0 | 5.0 | Chloride resistance |
| Nitrogen (N) | 0.24 | 0.32 | Strength enhancement |
| Iron (Fe) | Balance | – | Matrix formation |
Note: Trace elements (C, Mn, Si) are controlled to optimize weldability.
Q2: What are the key physical properties of 2507 Super Duplex Pipe Fittings S32750/1.4410/F53?
| Property | Value |
|---|---|
| Density | 7.8 g/cm³ (±1–2%) |
| Melting Point | 1320–1390°C |
| Thermal Conductivity | 18 W/m·K |
3. ASTM A815 UNS S32750 Super Duplex Steel Pipe Fittings (2507, 1.4410, F53) Mechanical Performance & Standards
Q3: What mechanical properties does ASTM A815 require?
| Property | Value | ASTM A815 Standard |
|---|---|---|
| Tensile Strength | 800–1000 MPa | ≥750 MPa |
| Yield Strength | 550 MPa | ≥550 MPa |
| Hardness (HB) | 290–320 | ≤310 |
Additional Tests:
- Impact Toughness: ≥45 J at –40°C (per ASTM A923).
- Hydrostatic Pressure: 1.5× design pressure.
4. Applications & Industry Use Cases
Q4: Where are S32750 fittings typically used?
- Offshore Oil & Gas: Subsea manifolds, risers (resists H₂S/CO₂).
- Chemical Plants: Phosphoric acid evaporators (replaces Hastelloy C-276).
- Desalination: Reverse osmosis systems (35,000 ppm NaCl resistance).
Case Example: A North Sea oilfield extended pipeline lifespan from 8 to 15 years by switching from 316L to S32750.
5.ASTM A815 UNS S32750 Super Duplex Steel Pipe Fittings (2507, 1.4410, F53) Types & Technical Specifications
Q5: What types of fittings does KCMSS supply?
| Fitting Type | Angle/Size | Application |
|---|---|---|
| Elbows | 30°/45°/90°/180° | Flow direction change |
| Tees | Equal/Reducing | Pipeline branching |
| Reducers | Concentric/Eccentric | Diameter transition |
| Stub Ends | Lap joint | Flange connections |
ASTM A815 UNS S32750 Super Duplex Steel Pipe Fittings (2507, 1.4410, F53) Key Parameters:
- Wall Thickness: SCH40 to SCH160 (ASME B16.9).
- Pressure Rating: Up to 420 bar for 90° elbows.
6. ASTM A815 UNS S32750 Super Duplex Steel Pipe Fittings (2507, 1.4410, F53) Installation & Maintenance FAQs
Q6: What are the welding requirements for S32750?
- Preheat: Not required (avoid >150°C interpass temperature).
- Filler Metal: ER2594 or E2594 (match PREN > 40).
- Post-Weld Heat Treatment: Solution annealing at 1100°C.
Q7: How to maintain S32750 fittings?
- Inspection: Annual ultrasonic testing for crack detection.
- Cleaning: Use nitric acid (10%) to remove chloride deposits.
7. ASTM A815 UNS S32750 Super Duplex Steel Pipe Fittings (2507, 1.4410, F53) Quality Control & Certifications
Q8: What quality standards does KCMSS follow?
- Material Traceability: PMI (Positive Material Identification) via XRF.
- Certifications: ISO 9001, NACE MR0175 for sour service.
Testing Protocols:
- Pitting Test: ASTM G48 Method A (pass criteria: no pitting at 50°C).
- Dimensional Checks: Laser scanning for ±0.5 mm tolerance.
8. Why Choose KCM Special Steel (KCMSS)?
- Customization: Tailored dimensions (DN15–DN1200).
- Global Logistics: Timely delivery to Europe/Middle East/Asia.
- Technical Support: Welding procedure specifications (WPS) provided.
9. Conclusion
ASTM A815 S32750 fittings from KCMSS combine corrosion resistance, strength, and longevity, making them ideal for critical infrastructure. This FAQ covers technical specs, installation, and maintenance—ensuring optimal performance.
Summary of ASTM A815 UNS S32750 Super Duplex Steel Pipe Fittings
1. Overview of S32750 Super Duplex Steel
ASTM A815 UNS S32750 (2507, 1.4410, F53) super duplex pipe fittings represent a pinnacle of engineering for demanding industrial environments. Characterized by exceptional corrosion resistance, high mechanical strength, and superior durability, these fittings are indispensable in sectors like offshore oil & gas, chemical processing, and desalination. Manufactured by KCM Special Steel (KCMSS), they combine a balanced microstructure of 50% austenite and 50% ferrite, ensuring optimal performance in aggressive media such as chloride-rich seawater, acidic solutions, and high-pressure hydrocarbon systems.
The alloy’s PREN (Pitting Resistance Equivalent Number) exceeding 40—attributed to its 24–26% chromium, 3–5% molybdenum, and 0.24–0.32% nitrogen—makes it resistant to pitting, crevice corrosion, and stress corrosion cracking (SCC). Notably, its tensile strength (800–1000 MPa) and yield strength (≥550 MPa) surpass conventional duplex and austenitic grades, while maintaining hardness below 310 HB to facilitate machining and welding.
2. Key Applications and Performance Advantages of ASTM A815 UNS S32750 Super Duplex Steel Pipe Fittings (2507, 1.4410, F53)
ASTM A815 UNS S32750 Super Duplex Steel Pipe Fittings (2507, 1.4410, F53) Industrial Use Cases
- Offshore Oil & Gas:
S32750 fittings (e.g., 90° elbows, equal tees) are deployed in subsea pipelines where resistance to H₂S/CO₂ corrosion and high-pressure conditions (up to 420 bar) is critical. Case studies demonstrate a service life extension from 8 to 15 years compared to 316L stainless steel. - Chemical Processing:
In phosphoric acid evaporators, S32750 concentric reducers and 30° elbows outperform nickel alloys like Hastelloy C-276, reducing erosion rates by 60% and lowering costs by 30%. - Desalination Plants:
45° elbows and stub ends in reverse osmosis systems withstand 35,000 ppm NaCl brine, eliminating biofouling and crevice corrosion issues prevalent with 2205 duplex steel.
ASTM A815 UNS S32750 Super Duplex Steel Pipe Fittings (2507, 1.4410, F53) High Performance Metrics
| Parameter | S32750 | Competitor Grades |
|---|---|---|
| Corrosion Rate | <0.1 mm/year (3.5% NaCl) | 0.3 mm/year (316L) |
| Pressure Rating | 420 bar (ASME B16.9) | 300 bar (316L) |
| Maintenance Cost | 45% lower | Higher (frequent replacements) |
3. Technical and Manufacturing Excellence by KCMSS
ASTM A815 UNS S32750 Super Duplex Steel Pipe Fittings (2507, 1.4410, F53) Product Range and Customization
KCMSS supplies a comprehensive portfolio of S32750 fittings, including:
- Elbows (30°/45°/60°/90°/180°) for directional flow control.
- Tees (equal/reducing) and crosses for pipeline branching.
- Reducers (concentric/eccentric) and caps for diameter transitions.
- Cross (4-way pipe fittings)
- Cap
- Stub ends (long/short)
All fittings adhere to ASME B16.9/B16.11 standards, with wall thicknesses from SCH40 to SCH160 and custom dimensions (DN15–DN1200).
ASTM A815 UNS S32750 Super Duplex Steel Pipe Fittings (2507, 1.4410, F53) Quality Assurance
KCMSS employs rigorous testing protocols:
- Material Traceability: XRF-based Positive Material Identification (PMI).
- Welding Compliance: ER2594 filler metal and solution annealing at 1100°C to prevent σ-phase formation.
- Certifications: ISO 9001, NACE MR0175, and ASTM G48 pitting resistance validation.
4. Conclusion: Why S32750 Fittings Stand Out
The ASTM A815 S32750 super duplex pipe fittings from KCMSS offer unmatched corrosion resistance, mechanical robustness, and cost efficiency for critical infrastructure. Their success in offshore, chemical, and desalination applications is underpinned by:
- Superior alloy design (Cr-Mo-N synergy).
- Proven performance in extreme conditions (validated by case studies).
- KCMSS’s technical expertise in customization and global supply chain reliability.
For industries prioritizing long-term asset integrity and operational safety, S32750 fittings represent a future-proof investment.
