ASTM A269 TP316L Electropolished (EP) tubes are seamless or welded tubes manufactured from low‑carbon 316L austenitic ss. The electropolishing (EP) process removes fine metal debris, smoothes weld seams and surface irregularities, and significantly reduces surface roughness. If you are looking for ASTM A269 TP316L EP tubes for pharmaceutical, biotechnology, semiconductor, food and other industries, GNEE can provide you with complete solutions.
The TP316L ss tubes supplied by GNEE are treated by electropolishing (EP). Their inner‑surface roughness can reach Ra ≤ 0.15 μm (Ra ≤ 0.25 μm as required by some industry standards), which is over 80 % smoother compared with conventional BA‑finished tubes (Ra ≤ 0.8 μm). This greatly reduces micro‑turbulence and particle adhesion during fluid flow. In the solution‑annealed condition, the tubes feature a tensile strength ≥ 485 MPa and an elongation ≥ 40 %, capable of meeting bending, flaring and other complex tube‑processing requirements.
During the electropolishing process of our TP316L stainless steel tubes, a Cr₂O₃ passivation layer with a thickness of ≥ 1.5 nm is formed on the tube surface, offering far higher stability than mechanical polishing or pickling‑passivation treatments. Salt‑spray tests demonstrate that its corrosion resistance exceeds 1000 hours, much better than ordinary stainless steel.
ASTM A269 TP316L SS EP Tubes
ASTM A269 TP316L SS MP Tubes
ASTM A269 TP316L SS AP Tubes
If you need assistance with these tubes, please let me know:
Whether you need seamless or welded manufacturing?
The chemical composition of 316L ss tubes ensures excellent corrosion resistance, high mechanical strength, and suitability for high-pressure and temperature applications in critical industrial systems.
Element
Composition (%)
Carbon
≤ 0.03
Chromium
16.0 – 18.0
Nickel
10.0 – 14.0
Molybdenum
2.0 – 3.0
Manganese
≤ 2.0
Silicon
≤ 1.0
Phosphorus
≤ 0.045
Sulfur
≤ 0.03
Iron
Balance
ASTM A269 316L SS Tubing – Mechanical Properties
316L ss tubes offer excellent tensile strength, ductility, and durability.
Property
Value
Tensile Strength
485 – 620 MPa
Yield Strength
≥ 170 MPa
Elongation (in 50 mm)
≥ 40%
Hardness (Brinell)
≤ 200 HB
Modulus of Elasticity
193 GPa
Density
8.0 g/cm³
ASTM A269 TP316L Tubes – Equivalent Grades
316L ss instrumentation tubes conform to multiple international standards, ensuring compatibility across global industrial applications.
Standard
Specification / Designation
Grade / Material No.
ASTM / ASME
ASTM A269 / SA269
TP316 / UNS S31600
EN
EN 10088-2 / EN 10216-5
X5CrNiMo17-12-2 / 1.4401
DIN
DIN 17456 / DIN 17458
1.4401
JIS (Japan)
JIS G3459 / JIS G4303
SUS 316
BS (United Kingdom)
BS 3605 / BS 970
316S31
ISO
ISO 15510
X5CrNiMo17-12-2
AFNOR (France)
NF A35-572
Z6CND17-11-02
GOST (Kazakhstan)
GOST 5632
03Ch17N14M3
Manufacturing processes for TP316L sS
1. Seamless pipes: Produced from solid ss billets via hot rolling or cold rolling, followed by annealing and finishing processes to ensure uniform wall thickness and dimensional accuracy.
2. Welded pipes: Formed from ss strips and longitudinally welded; suitable for large-diameter applications.
3. Cold-drawing process: Applied to both seamless and welded pipes to enhance mechanical strength, surface finish, and dimensional accuracy, thereby ensuring superior performance in high-pressure instrumentation systems.
How do you calculate the weight of TP316L EP steel pipes?
ASTM A269 mainly covers small-diameter cold-rolled seamless tubes for precision instruments and clean fluid delivery. Featuring low carbon and high molybdenum content, TP316L is ideal for high-purity media and corrosive working conditions. Below are our benchmark completed projects:
1.Dubai GMP Pharmaceutical Purified Water Project
We supplied ASTM A269 TP316L precision seamless tubes (OD 6.35-25.4mm, WT 0.5-1.2mm) with EP inner surface (Ra≤0.5μm). Full PMI, flaring & hydrostatic tests plus SGS certificates were provided. The tubing fits compression fittings directly, running stably for 2 years without scaling or corrosion.
2.Rayong Thailand Oil & Gas Instrument Gas Supply Project
In-stock A269 TP316L tubing (PREN≥25) was delivered within 10 days for H₂S-containing working conditions, solving urgent maintenance shutdown risks and maintaining leak-free operation.
Quality Control
We conduct strict multi-stage quality control over our ss products from raw materials to finished goods. We first verify the alloy composition of raw materials, then inspect dimensional accuracy, pressure resistance and mechanical properties, and check for surface defects. Third-party inspection reports are available, every batch is fully traceable, and our products deliver stable and reliable quality.
Outer diameter measurement
composition inspection
wall thickness test
To learn more about our quality control process, please click the link below to view our product inspection videos, testing procedures, and inspection reports.
We adopt multi-layer export packaging for stainless steel products. Plastic end plugs block dust and collision at pipe openings, anti-rust PE films wrap each tube, and foam pads protect precision machined areas. Reinforced wooden crates with internal limiting fixtures suit long ocean shipping and multi-stage transit, preventing surface scratches, moisture rust and pipe deformation effectively.
Moisture‑proof packaging
strapping & fixing
wooden crate packaging
FAQ
1. Can EP tubes be welded directly on-site?
Yes, our TP316L EP tubes are ideal for orbital welding, maintaining cleanliness and minimizing surface irregularities after welding.
2.What's the difference between 316 and 316L sS pipe?
The main difference between 316 and 316L ss is their carbon content. Grade 316 has a maximum carbon content of 0.08%, while 316L (the "L" stands for low carbon) has a maximum limit of 0.03%. This small change in carbon affects their strength, high-temperature performance, and behavior when welded
3.What are the key differences between ASTM A269 and A312 pipes?
ASTM A269 and ASTM A312 differ primarily in their product scope and sizing, with ASTM A269 covering stainless steel tubing for general service and ASTM A312 covering stainless steel pipe for high-temperature and general corrosive service.
4.Is electropolished tubing necessary for food-grade applications?
For high-purity or sterile food and beverage systems, EP tubes reduce contamination and biofilm risk, making them preferable over standard polished tubes.
pure‑water workshop pipelines
seawater desalination pipelines
