430 Stainless Steel Round Pipe
Premium seamless ferritic stainless steel round pipe for precision industrial applications
430 stainless steel seamless round pipe offers superior dimensional accuracy, excellent mechanical properties, and reliable corrosion resistance. Ideal for precision machinery, instrumentation, and demanding industrial applications requiring consistent quality and performance.
Quick Specifications
- UNS Designation
- S43000
- Yield Strength (Annealed)
- 240 MPa (35 ksi) minimum
- Tensile Strength (Annealed)
- 430 MPa (62 ksi) minimum
- Elongation (Annealed)
- 22% minimum
- Density
- 7.75 g/cm³
- Wall Thickness Range
- 0.5 mm to 12 mm (custom fabrication available)
Standards & Certifications
Product Description
430 stainless steel round pipe is manufactured using seamless tube production methods that ensure superior dimensional consistency and internal cleanliness compared to welded alternatives. The seamless manufacturing process eliminates the weld seam, providing uniform mechanical properties throughout the pipe cross-section and significantly improved fatigue performance. Hot-rolling and drawing operations create a fine, uniform grain structure with excellent strength-to-weight characteristics and superior surface quality suitable for critical applications.
The seamless production method involves piercing of hollow ingots followed by mandrel rolling and drawing to achieve precise outer diameter and wall thickness specifications. This process creates a dense microstructure with virtually no porosity or inclusions that could initiate fatigue cracks under cyclic loading. The resulting pipe exhibits superior burst pressure ratings and fatigue strength compared to welded tubing, justifying the higher cost for applications where reliability is critical.
430 stainless steel round pipe maintains excellent corrosion resistance in atmospheric, freshwater, and mildly corrosive industrial environments. The ferritic microstructure provides superior oxidation resistance at elevated temperatures up to 540°C, making it suitable for thermal processing systems and heat treatment applications. The material resists corrosion from many organic acids, minerals, and chemical compounds used in food processing, pharmaceutical manufacturing, and laboratory applications.
Standard schedules and dimensions are available from small instrumentation sizes (6 mm outside diameter) to large industrial applications. Custom dimensions and wall thicknesses can be manufactured to exacting specifications for precision machinery and specialized equipment. The material is readily available in common industrial sizes with production lead times significantly shorter than special alloys, allowing for cost-effective inventory management and reduced project delays.
Specifications
| UNS Designation | S43000 |
| Yield Strength (Annealed) | 240 MPa (35 ksi) minimum |
| Tensile Strength (Annealed) | 430 MPa (62 ksi) minimum |
| Elongation (Annealed) | 22% minimum |
| Density | 7.75 g/cm³ |
| Wall Thickness Range | 0.5 mm to 12 mm (custom fabrication available) |
| Outside Diameter Range | 6 mm to 500 mm (standard sizes readily available) |
| Thermal Conductivity | 26 W/m·K at 20°C |
| Coefficient of Linear Expansion | 10.4 × 10⁻⁶ /°C (0-100°C) |
| Modulus of Elasticity | 200 GPa |
| Burst Pressure Rating | Significantly higher than welded equivalents |
| Surface Finish | Polished or brushed finish options available |
Chemical Composition
| Element | Content (%) |
|---|---|
| Chromium (Cr) | 16.0-18.0 |
| Carbon (C) | 0.12 max |
| Manganese (Mn) | 1.0 max |
| Silicon (Si) | 1.0 max |
| Phosphorus (P) | 0.040 max |
| Sulfur (S) | 0.030 max |
| Nickel (Ni) | 0.50 max |
| Nitrogen (N) | 0.10 max |
| Iron (Fe) | Balance |
Mechanical Properties
| Property | Value |
|---|---|
| Hardness (Annealed) | 217 HV maximum |
| Impact Strength (Charpy V-notch) | 50-60 J at room temperature (seamless) |
| Fatigue Strength | 200 MPa at 10⁷ cycles (seamless advantage) |
| Notch Sensitivity | Low (excellent resistance to fatigue crack initiation) |
| Fracture Toughness | Good, superior to welded tubing |
| Internal Cleanliness | Excellent (vacuum degassing techniques employed) |
Key Features & Advantages
Applications
Precision Instrumentation
Laboratory equipment, analytical instruments, and precision measurement devices requiring exact dimensional accuracy and superior surface quality for reliability in critical testing applications.
Mechanical Engineering Systems
Precision machinery components, hydraulic systems, pneumatic tubing, and automated equipment where dimensional consistency and fatigue resistance are essential for operational reliability.
Heat Treatment Equipment
Furnace components, heat exchanger tubing, and thermal processing equipment exposed to elevated temperatures and thermal cycling with requirements for structural integrity and creep resistance.
Pharmaceutical Equipment
Pharmaceutical manufacturing equipment, sterile processing systems, and laboratory apparatus requiring exceptional cleanliness, dimensional accuracy, and corrosion resistance for product purity.
Chemical Processing
Reactor vessels, condensate systems, and process piping in chemical facilities requiring superior fatigue performance and resistance to organic acid corrosion in cyclic service.
Valve and Pump Components
Valve bodies, pump housings, and actuator components in industrial systems requiring high reliability, excellent pressure ratings, and superior fatigue performance.
Frequently Asked Questions
What is the advantage of seamless 430 pipe over welded 430 pipe?
What surface finish options are available for 430 seamless pipe?
Can seamless 430 pipe be used for high-pressure applications?
How does seamless 430 compare to seamless 304 stainless pipe?
What is the typical delivery time for seamless 430 pipe?
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