Product Overview
304 Stainless Steel Elbows are essential pipe fitting components designed for changing pipeline direction in fluid and gas transmission systems. Manufactured from premium 304 stainless steel (UNS S30400 / EN 1.4301), these elbows offer excellent corrosion resistance, superior mechanical properties, and exceptional hygienic performance across a wide range of industrial applications.
Also known as SS 304 Elbow, AISI 304 Elbow, 304 Pipe Elbow, or Stainless Steel 90-Degree Elbow, our 304 elbows are engineered to withstand pressures up to 20 MPa and temperatures from -196°C to 800°C, making them the preferred choice for plumbing, food processing, chemical, and pharmaceutical industries worldwide.
What is 304 Stainless Steel?
304 stainless steel is the most widely used austenitic stainless steel grade globally. Composed of approximately 18% chromium and 8% nickel, it offers outstanding corrosion resistance, excellent formability, and superior weldability. As part of the 18/8 stainless steel family, 304 is non-magnetic in annealed condition and cannot be hardened by heat treatment.
The “L” variant — 304L stainless steel elbow — contains lower carbon content (≤ 0.03%) for enhanced resistance to intergranular corrosion after welding, making it ideal for welded pipeline systems in corrosive environments.
Key Features
- Excellent Corrosion Resistance: Superior resistance to oxidation, corrosion, and staining in most atmospheric and chemical environments
- High Temperature Performance: Reliable service from cryogenic temperatures to 870°C in intermittent use, up to 925°C continuously
- Smooth Interior Surface: Mirror-like inner wall minimizes flow resistance and prevents bacterial growth — ideal for hygienic applications
- Full Range of Angles: Available in 45°, 90°, 90° Short Radius (SR), 90° Long Radius (LR), 135°, and 180° configurations
- Multiple Connection Types: Butt weld, socket weld, threaded, and flanged ends for versatile installation
- Cost-Effective: Optimal balance between performance and cost compared to higher-grade alloys (316, 321, 904L)
- Easy Fabrication: Excellent formability, weldability, and machinability for custom configurations
Chemical Composition
| Element | Content |
|---|---|
| Chromium (Cr) | 18.0 – 20.0% |
| Nickel (Ni) | 8.0 – 10.5% |
| Carbon (C) | ≤ 0.08% (304) / ≤ 0.03% (304L) |
| Manganese (Mn) | ≤ 2.00% |
| Silicon (Si) | ≤ 0.75% |
| Phosphorus (P) | ≤ 0.045% |
| Sulfur (S) | ≤ 0.030% |
| Nitrogen (N) | ≤ 0.10% |
| Iron (Fe) | Balance |
Mechanical Properties
| Property | Annealed Condition |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2%) | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 92 HRB (Rockwell B) |
| Modulus of Elasticity | 193 GPa |
Dimensions & Specifications
Elbow Types
| Type | Description | Application |
|---|---|---|
| 90° Short Radius (SR) | Center-to-end = 1.5 × Nominal Pipe Size (NPS) | Space-constrained installations |
| 90° Long Radius (LR) | Center-to-end = 1.5 × Nominal Pipe Size (NPS) | Standard applications, lower pressure drop |
| 45° Elbow | Center-to-end = 1.5 × NPS | Gradual direction changes |
| 180° Return Bend | Center-to-end = 3 × NPS | U-bend configurations |
| Reducing Elbow | Changes both direction and pipe diameter | Branch connections |
Size Range
- NPS: 1/8″ – 48″ (DN6 – DN1200)
- Schedule: SCH 5S, 10S, 20S, 40S, 80S, 160S, XXS
- Wall Thickness: Per ANSI B36.19 / B36.10
Connection Types
- Butt Weld (BW): Standard for high-pressure and high-temperature systems
- Socket Weld (SW): For small-diameter high-pressure applications
- Threaded (NPT/BSPT): Easy installation for low-pressure systems
- Flanged: Removable connections for maintenance access
Compliance Standards
- ASTM A403 / ASME SA403 (Standard Wrought Austenitic)
- ASTM A774 (Standard for Wrought Austenitic Piping Fittings)
- ANSI B16.9 (Factory-Made Wrought Buttwelding Fittings)
- ANSI B16.28 (Short Radius Wrought Buttwelding Fittings)
- MSS SP-43 (Standard Practice for Stainless Steel)
- EN 10253-3 / EN 10253-4
- JIS B2312, JIS B2313
- ISO 5251, ISO 6708
Pressure Ratings
| Class | Max Working Pressure (approx.) | Typical Use |
|---|---|---|
| Class 150 (PN20) | 20 bar @ 38°C | Low-pressure water, air |
| Class 300 (PN50) | 50 bar @ 38°C | Medium-pressure steam, oil |
| Class 600 (PN110) | 110 bar @ 38°C | High-pressure systems |
Surface Finishes
- Annealed & Pickled: Standard industrial finish, optimum corrosion resistance
- Mirror Polish (MP): Bright polished, Ra ≤ 0.8μm — ideal for food, dairy, biotech
- Satin Finish: Semi-polished, Ra 0.8 – 1.6μm
- Sand Blast: Matte surface for decorative or non-critical applications
- Electropolished (EP): Ultra-smooth surface for ultra-pure systems
Applications
| Industry | Use Cases |
|---|---|
| Plumbing & Water Supply | Potable water piping, water treatment plants, building services |
| Food & Beverage | Dairy processing, brewery, beverage production, food-grade piping |
| Pharmaceutical & Biotech | Pure water systems, sterile process piping, CIP/SIP systems |
| Chemical Processing | Mild chemical transport, tank farms, process piping |
| Architecture & Construction | Handrails, structural supports, façade systems |
| HVAC & Refrigeration | Air conditioning, chilled water, steam systems |
| Automotive | Exhaust systems, fuel lines (304L) |
| Oil & Gas | Low-pressure transmission, refining auxiliary systems |
Why Choose 304 vs 316 Stainless Steel Elbows?
| Property | 304 SS Elbow | 316 SS Elbow |
|---|---|---|
| Corrosion Resistance | Good (general purpose) | Excellent (marine/chloride) |
| Molybdenum Content | None | 2-3% |
| Cost | Lower | ~20-30% higher |
| High-Temp Strength | Good up to 870°C | Slightly better |
| Best For | Food, dairy, water, architecture | Marine, chloride, medical |
Recommendation: Choose 304 stainless steel elbows for most general-purpose applications where cost efficiency and standard corrosion resistance are priorities. Opt for 316 stainless steel elbows only when facing chloride-rich or marine environments.
Quality Assurance
✓ Mill Test Certificate (MTC) with chemical and mechanical test results
✓ Hydrostatic Pressure Test for leak-free performance
✓ Positive Material Identification (PMI) verification
✓ Dimensional Inspection per applicable standards
✓ Surface Roughness Testing for hygienic applications
✓ Third-Party Inspection by SGS, BV, TÜV, DNV available
✓ Full Traceability: Heat number stamped on every fitting
Packaging & Shipping
- Plastic end caps on both sides for protection
- Bubble wrap + cardboard wrapping for individual pieces
- Wooden pallet or crate for container shipments
- Polywood cases for sea freight (FCL/LCL)
- Shipping marks and documents per customer requirements
- Delivery: Stock items 5-7 business days; custom orders 15-30 days
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Inquiry Form
To receive a competitive quotation, please provide:
- Product: 304 / 304L Stainless Steel Elbow
- Size: NPS (e.g., 2″, 4″, 6″) or DN
- Type: 90° LR / 90° SR / 45° / 180° Return / Reducing
- Connection: Butt Weld / Socket Weld / Threaded / Flanged
- Schedule: SCH 10 / SCH 40 / SCH 80 / etc.
- Quantity: Pieces or metric tons
- Standard: ASTM A403 / ANSI B16.9 / EN / JIS
- Surface Finish: Pickled / Polished / Electropolished
- Certification Required: MTC / PMI / Third-party inspection
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