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Hemaokang Steel (Shandong) Co., Ltd. is a trusted manufacturer and supplier of high-quality stainless steel tubing. Our 304L Stainless Steel Seamless Pipe ASTM A269 6mm-25mm OD for Instrumentation Tubes is engineered to meet the most demanding requirements of precision instrumentation systems. With a state-of-the-art production facility and ISO9001 certification, we deliver consistent quality, strict dimensional tolerances, and excellent corrosion resistance. Whether you need tubing for control panels, pneumatic lines, or analytical instruments, our product provides reliable performance and long service life.
This seamless pipe is manufactured from low-carbon 304L stainless steel, which offers superior weldability and resistance to intergranular corrosion. The ASTM A269 standard ensures tight tolerances on outer diameter, wall thickness, and straightness, making it ideal for applications where leak-free connections and precise fluid flow are critical. Our tubing is available in outer diameters ranging from 6mm to 25mm, with various wall thickness options to suit different pressure requirements.
Key Features & Benefits
- High Precision Dimensions: Outer diameter tolerance as tight as ±0.05mm, ensuring easy fitting with compression fittings and instrumentation connectors.
- Excellent Corrosion Resistance: 304L low-carbon grade minimizes carbide precipitation during welding, maintaining resistance in harsh environments.
- Seamless Construction: No welded seams, eliminating weak points and reducing risk of leakage under high pressure or vibration.
- Surface Finish Options: Pickled and annealed, bright annealed, or polished finish available upon request to match your specific cleanliness standards.
- Customizable Lengths: Random lengths (5-7m) or fixed lengths (1m, 3m, 6m) to reduce waste and installation time.
- Wide Application Range: Suitable for instrumentation, hydraulic systems, pneumatic controls, chemical injection lines, and more.
Technical Specifications
| Parameter | Value |
|---|---|
| Material | 304L Stainless Steel (UNS S30403) |
| Standard | ASTM A269, ASME SA269 |
| Outer Diameter Range | 6mm, 8mm, 10mm, 12mm, 16mm, 20mm, 25mm (custom sizes available) |
| Wall Thickness | 0.5mm – 3.0mm (other thicknesses upon request) |
| Tensile Strength | ≥ 485 MPa |
| Yield Strength | ≥ 170 MPa |
| Elongation | ≥ 35% |
| Surface Finish | Pickled & Annealed (standard), Bright Annealed (optional) |
| Length | Random length 5–7m, or fixed lengths as per customer (1m, 3m, 6m, etc.) |
Why Choose Hemaokang Steel?
Our company, Hemaokang Steel (Shandong) Co., Ltd., was established in 2025 but has quickly gained a reputation for excellence in the stainless steel pipe industry. With an annual export value of US$50 Million – US$100 Million and a dedicated team of 51–100 employees, we serve customers across North America, South America, Europe, Asia, Africa, Oceania, and the Middle East. Our ISO9001-certified quality management system ensures every batch of tubing meets the highest standards. We offer competitive pricing, fast lead times, and flexible packaging options (plastic caps, wooden crates, or bundles) to protect your goods during transit.
Whether you are an instrumentation manufacturer, a system integrator, or a distributor, our 304L Stainless Steel Seamless Pipe ASTM A269 will help you build reliable, long-lasting systems. We invite you to contact us for a quote or to discuss your specific requirements. Experience the Hemaokang difference – quality, precision, and service you can trust.
Frequently Asked Questions (FAQ)
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Q: What is the difference between 304L and 304 stainless steel for instrumentation tubes?
A: 304L has a lower carbon content (max 0.03%) which reduces the risk of carbide precipitation during welding, making it more suitable for welded applications and corrosive environments. It provides better intergranular corrosion resistance while maintaining similar strength. -
Q: Can you provide tubes with a wall thickness thinner than 0.5mm?
A: Yes, we can customize wall thickness to as low as 0.3mm depending on the outer diameter. Please contact our sales team with your specific requirements, and we will confirm availability. -
Q: What is the typical tolerance on the outer diameter for 6mm tubes?
A: According to ASTM A269, the standard tolerance for OD ≤ 12.7mm is ±0.10mm. However, we can achieve tighter tolerances of ±0.05mm for precision instrumentation applications upon request. -
Q: Do you offer cut-to-length service? What is the minimum order quantity?
A: Yes, we can cut tubes to any fixed length between 0.5m and 12m. The minimum order quantity (MOQ) for standard sizes is 500 kg, but for smaller quantities we can discuss based on stock availability. -
Q: Are these tubes suitable for high-pressure hydraulic systems?
A: The 304L seamless pipe is suitable for medium-pressure applications. For high-pressure hydraulic systems, we recommend verifying the working pressure with our technical team, as it depends on wall thickness and OD. Typically, a 6mm OD with 1mm wall thickness can handle up to 400 bar. -
Q: What kind of packaging do you use for export?
A: We use plastic caps on both ends, then bundle the tubes with steel straps or pack them in wooden crates. For smaller diameters, we can also use hexagonal bundles. All packaging is seaworthy and can be customized to your requirements. -
Q: How long does delivery usually take?
A: For standard sizes and wall thicknesses, delivery takes 15–25 days after order confirmation. For custom sizes or special finishes, lead time may be 25–35 days. We offer expedited shipping for urgent orders. -
Q: Do you provide a mill test certificate (MTC) with each shipment?
A: Yes, we provide a mill test certificate per ASTM A269, including chemical composition and mechanical properties, for every batch. Additional third-party inspection can be arranged upon request.
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