MSS SP 83 B462 UNS N08020 Pipe Unions
MSS SP-83 B462 UNS N08020 Pipe Unions are high-performance, three-piece coupling devices manufactured from ASTM B462 UNS N08020 (Alloy 20/Carpenter 20) nickel-based alloy. Designed for highly corrosive environments (such as sulfuric acid, phosphoric acid, and chloride media) and high-temperature/pressure systems, they are widely used in chemical processing, pharmaceuticals, oil & gas, and environmental engineering applications.
High Quality MSS SP 83 B462 UNS N08020 Pipe Unions
- Pressure Rating: Class 3000 (~750 psi) and 6000 (~1500 psi)
- Size Range: typically NPS 1/8″ to 4″
- Types: Socket weld (SW), Threaded (NPT)
Key Features
Corrosion Resistance:
- Outstanding performance in boiling sulfuric acid (≤50% concentration)
- Superior pitting and crevice corrosion resistance (PREN ≈33)
Welding Performance:
- Nb-stabilized to prevent sensitization
- Recommended filler: AWS A5.14 ER320LR
Mechanical Properties:
- Maintains strength and ductility across temperature range
Material Specifications (UNS N08020)
Chemical Composition:
- Nickel (Ni): 35%
- Chromium (Cr): 20%
- Molybdenum (Mo): 3.5%
- Copper (Cu): 2.5%
- Niobium (Nb): Stabilizing element
Key Properties:
- Excellent corrosion resistance to sulfuric acid (all concentrations), phosphoric acid, and chloride solutions
- Resistant to intergranular and stress corrosion cracking (SCC)
- Temperature range: -200°C to +400°C (continuous service)
- Tensile strength: ≥550 MPa
- Hardness: ≤200 HB
Structure & Types
Three-Piece Design:
- Consists of two threaded or socket weld ends (male/female) and a central nut for quick assembly/disassembly.
- Sealing: Metal-to-metal contact (no gasket), relying on precision machining for leak-proof performance.
Connection Types:
- Threaded Unions: Use NPT threads for pipe connections.
- Socket Weld Unions: Welded to pipes for higher-pressure applications.
Pressure Ratings:
- Class 3000 (~750 psi) and Class 6000 (~1500 psi). Pressure-temperature ratings are defined in standard tables.
Typical Applications
- Chemical Processing: Sulfuric acid production, phosphoric acid storage
- Pharmaceutical: CIP/SIP systems, API synthesis reactors
- Environmental: Wastewater treatment with chlorides/sulfides
- Oil & Gas: Sour service instrumentation lines
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SSM has significant product advantages in manufacturing MSS SP 83 B462 UNS N08020 Pipe Unions. Whether it’s quality or price, we will meet your needs.
More Information about MSS SP 83 B462 UNS N08020 Pipe Unions
MSS SP-83 Standard
Specifies the design, dimensions, and testing requirements for socket weld (SW) and threaded (NPT) unions, suitable for small-bore high-pressure piping (NPS 1/8″ to 4″).
Pressure ratings: Class 3000 (~750 psi) and Class 6000 (~1500 psi).
ASTM B462
Material standard for nickel alloy forgings, covering the chemical composition, mechanical properties, and manufacturing requirements of UNS N08020 (Alloy 20).
Installation Guidelines
Welding Requirements:
- Control interpass temperature ≤150°C
- Use proper shielding gas
Avoid:
- Fluoride-containing oxidizing acids
- Long-term service >400°C
Maintenance:
- Regular inspection of threaded connections
- Nitric acid or alkaline cleaning recommended
Technical Comparison
| Parameter | Alloy 20 (UNS N08020) | 316L Stainless | Hastelloy C-276 |
| Sulfuric Acid | Excellent (all conc.) | Limited | Good |
| Chloride | Excellent | Moderate | Excellent |
| Cost | Moderate | Low | High |
| Temp. Range | -200°C to +400°C | -50°C to +450°C | -200°C to +1093°C |
FAQ
- PMI Testing: Confirm Ni (~35%), Cr (~20%), Mo (~3.5%), Cu (~2.5%).
- Hardness Check: ≤200 HB (as per ASTM B462).
- Mill Test Reports: Ensure traceability to heat number.
Annual Inspections: Check for thread wear, crevice corrosion, and weld cracks.
Cleaning: Use nitric acid passivation or alkaline solutions; avoid hydrochloric acid.
Standard:
EN 10204 3.1 Material Certificate.
MSS SP-83 Compliance.
Optional:
NACE MR0175: For sour (H₂S) environments.
ASME BPE: For sanitary applications.
For application-specific engineering support or technical drawings, please consult our engineering department. All unions are supplied with complete material certification and can be customized to meet project requirements.
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