Product Name: Polished Seamless Tube
Material: Stainless Steel 316L
Standard: ASTM A269 / ASME SA269, ASTM A213 / ASME SA213, EN 10216-5
Outer Diameter (OD): 1/4" – 2"
Surface Finish: Polished (Internal & External)
Length: Fixed Length (6m) or Cut-to-Length
SMLSCO Tube Quality Control&Testing
The safety of hydraulic systems is crucial, therefore SMLSCO implement strict quality control and testing procedures for every hydraulic tube that leaves the factory. All tubes must undergo 100% hydrostatic testing or non-destructive testing (such as eddy current testing) to verify their pressure bearing capacity and integrity under conditions far exceeding the working pressure. At the same time, we conduct precise measurements of the outer diameter, wall thickness, concentricity, and surface condition of our products to ensure compliance with international standards such as ASTM A269, providing solid data support for your system safety.
316L Material Properties
316L stainless steel is the preferred material for hydraulic system applications. Due to the addition of molybdenum element, it exhibits stronger corrosion resistance than 304L in high chloride and industrial acidic environments, effectively protecting the purity of hydraulic oil and other media, and extending the service life of the pipeline itself. Its excellent combination of strength and toughness ensures the safety of long-term operation under high pressure. Meanwhile, as a low-carbon brand, it has excellent weldability, easy on-site installation and maintenance, and reliable and stable performance.
316L Tube Application in Hydraulic Systems
316L stainless steel seamless tubes are the ideal choice for hydraulic systems operating under harsh conditions. Hydraulic systems require piping with extreme high-pressure resistance and corrosion resistance, and 316L perfectly meets these requirements.
The seamless structure of 316L ensures it can withstand extreme working pressures, providing a safety guarantee for the system. More importantly, 316L contains molybdenum, which gives it exceptional resistance to chloride corrosion. This makes it highly effective in corrosive environments such as offshore platforms, marine equipment, and chemical plants, preventing premature failure of the piping and outperforming 304 stainless steel.
Additionally, the smooth inner walls and precise tolerances of 316L tubes effectively protect sensitive valves and pumps in hydraulic systems, reducing failure rates. Therefore, for high-end hydraulic and instrumentation systems seeking long-term reliability and aiming to reduce lifecycle maintenance costs, choosing 316L stainless steel tubes is a wise investment.
What is Cold Drawing Process?
Cold drawing is the core process for producing high-precision hydraulic pipes. During this process, the seamless tube blank that has undergone heat treatment is drawn through precision molds and core rods at room temperature, achieving secondary precise shaping of the outer diameter, inner diameter, and wall thickness. Compared to hot-rolled pipes, cold drawing technology can significantly improve the dimensional accuracy of pipes, improve surface smoothness, and enhance the mechanical strength of materials. This is crucial for ensuring absolute sealing when connecting hydraulic pipes and fittings, and reducing system pressure loss.
