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As a leading manufacturer in the stainless steel industry, Wuxi Yansheng Technology Co., Ltd. is proud to present our premium line of ASTM 304L and 316L Bright Annealed Hydraulic Stainless Steel Tubes. Established in 2017 and operating from a modern facility spanning 1,000-3,000 square meters, we have built a strong reputation for delivering high-precision, reliable components for demanding industrial applications worldwide. Our hydraulic tubes are engineered to provide exceptional performance in high-pressure environments, offering superior corrosion resistance, excellent mechanical properties, and a flawless surface finish that minimizes friction and contamination in fluid power systems. We understand the critical nature of hydraulic components, and our products are manufactured to meet the stringent requirements of industries where failure is not an option.
Our Bright Annealed Hydraulic Tubes are produced using advanced manufacturing techniques and stringent quality control processes, certified under ISO 9001 and other relevant management systems. The bright annealing process is a key differentiator, resulting in a smooth, reflective, and scale-free surface that is ideal for hydraulic and pneumatic applications. This finish not only enhances the aesthetic appeal but, more importantly, improves corrosion resistance and facilitates easier cleaning and maintenance.
Key Product Features and Technical Advantages:
- Superior Material Integrity: Manufactured from ASTM 304L or 316L stainless steel, offering excellent resistance to a wide range of corrosive media. The low carbon content of 304L/316L minimizes the risk of sensitization and intergranular corrosion, especially after welding.
- Precision Bright Annealed Finish: The tubes undergo a controlled atmosphere annealing process that produces a clean, bright, and passive surface. This eliminates the need for pickling and passivation in many cases, saving time and cost for the end-user.
- Enhanced Hydraulic Performance: The smooth internal surface (low Ra value) reduces pressure drop and turbulent flow, leading to more efficient system operation. It also prevents particle entrapment, which is crucial for the longevity of sensitive valves and pumps.
- High Dimensional Accuracy: Our tubes are produced to tight tolerances on outer diameter (OD) and wall thickness (WT), ensuring reliable fit and performance in manifold blocks, cylinder barrels, and other assemblies.
- Consistent Mechanical Properties: The annealing process ensures uniform hardness and tensile strength throughout the tube length, providing predictable and reliable performance under pressure.
- Versatility in Application: While designed for hydraulic and pneumatic systems, these tubes are also suitable for instrumentation, food and beverage processing, pharmaceutical lines, and other high-purity applications.
Technical Specifications at a Glance:
| Parameter | Details / Typical Range |
| Primary Material Standards | ASTM A269 (Seamless), ASTM A213 (Seamless) |
| Grades Available | 304L (UNS S30403), 316L (UNS S31603) |
| Common Outer Diameter (OD) | 6mm to 100mm (Custom sizes available) |
| Common Wall Thickness (WT) | 1mm to 5mm (Custom sizes available) |
| Standard Length | 6 meters, or cut to specified length |
| Surface Roughness (Internal) | Low Ra value, suitable for hydraulic fluid |
| Tolerance | ASTM standard or customer-specific |
Benefits for Your Business: Choosing our hydraulic tubes translates into tangible benefits for your operations. You gain access to components that contribute to increased system reliability and reduced downtime due to their corrosion-resistant nature. The bright annealed finish can lead to lower maintenance costs by resisting scale build-up and simplifying cleaning procedures. Furthermore, our capability to provide customized dimensions and our efficient supply chain, supported by major ports like Shanghai and Tianjin, ensure you receive the right product at the right time, helping to streamline your production and procurement processes.
With an annual export value ranging between US$50 Million and US$100 Million and a dedicated team of 101-200 professionals, Wuxi Yansheng Technology has the scale and expertise to be your trusted partner for stainless steel hydraulic solutions. Our products reach diverse markets across North America, Europe, Asia, and beyond, a testament to their consistent quality and performance. We back our manufacturing with a commitment to quality management, as reflected in our certifications. When you source from us, you are not just buying a tube; you are investing in a component built with precision, supported by robust manufacturing credentials, and delivered by a company with a proven global track record. Contact us today to discuss your specific requirements for ASTM 304L/316L Bright Annealed Hydraulic Tubes and discover how we can support your project's success.
Frequently Asked Questions (FAQ)
Q1: What is the main advantage of a bright annealed finish over a standard annealed and pickled finish for hydraulic tubes?
A1: The bright annealed (BA) finish provides a smoother, cleaner, and more reflective surface directly from the furnace, without the need for acid pickling. This results in a superior surface for fluid flow, better corrosion resistance in the as-delivered state, and often eliminates a processing step for the end-user.
Q2: Can your ASTM 304L and 316L hydraulic tubes be welded easily?
A2: Yes. The "L" grade designation indicates low carbon content, which significantly reduces the risk of chromium carbide precipitation in the heat-affected zone during welding. This makes both 304L and 316L grades highly suitable for welded hydraulic assemblies without subsequent heat treatment in most applications.
Q3: Do you provide material test certificates with your shipments?
A3> Yes, we can provide standard material test certificates (MTC) that include chemical composition and mechanical property reports, traceable to the heat or batch number. This documentation is available upon request to ensure compliance with your quality assurance protocols.
Q4: What are the typical lead times for custom-sized orders?
A4: Lead times vary based on the order quantity, specific dimensions, and current production schedule. Generally, for standard size ranges, we maintain stock or can produce within a few weeks. We provide a firm lead time quotation upon review of your detailed specifications.
Q5: How do I choose between ASTM 304L and 316L for my hydraulic application?
A5: The choice depends on the operating environment. ASTM 304L offers good general corrosion resistance. ASTM 316L, with its addition of molybdenum, provides enhanced resistance to chlorides and acidic conditions, making it a preferred choice for marine applications or systems exposed to more aggressive chemicals.
Q6: Are these tubes suitable for high-pressure applications?
A6: Our tubes are manufactured to standards suitable for hydraulic pressure applications. The actual pressure rating depends on the tube's dimensions (OD and WT), the material grade, and the safety factor applied. We recommend consulting engineering pressure vessel formulas or providing your pressure requirements so we can advise on the appropriate specification.
Q7: What packaging is used to protect the bright annealed surface during transit?
A7> We use protective packaging to prevent scratching and damage. This typically includes plastic end caps, protective sleeves or film wrapping, and secure bundling on wooden crates or pallets suitable for ocean or air freight.
Q8: Can you supply these tubes with additional processing, like bending or flaring?
A8: Yes, we offer value-added processing services including cutting to precise lengths, bending, end finishing (deburring, flaring), and marking. Please provide your detailed requirements for a comprehensive quotation.
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