316L Seamless Stainless Steel Hexagonal Tube
This TP316L seamless hexagonal tube is cold drawn from a pierced round billet with no longitudinal weld seam, so the hexagonal wall stays uniform through every flat and corner. The low carbon 316L grade with 2-3% molybdenum resists pitting and crevice corrosion in chloride environments where 304 hex tube would start to pit.
Standard stock size is 19mm across flats with 1.5mm wall; the full range runs from 8mm to 60mm AF with wall thickness 1.0mm to 6.0mm. Tubes are bright annealed to keep the surface oxide-free for plating, CNC turning and laser cutting.
Key Specifications
| Material Grade |
316L (EN 1.4404 / UNS S31603) |
| Standard |
ASTM A511 / A511M, ASTM A269, EN 10216-5 |
| Section Shape |
Hexagonal, cold drawn seamless |
| Across Flats |
8mm - 60mm |
| Wall Thickness |
1.0 - 6.0 mm |
| Length |
3 - 6 m, random or fixed length, cut to size available |
| AF Tolerance |
±0.05 mm |
| Surface |
Bright annealed, pickled, or polished on request |
| Chemical Composition |
C ≤ 0.03%, Cr 16-18%, Ni 10-14%, Mo 2.0-3.0%, Mn ≤ 2%, Si ≤ 0.75% |
| Mechanical Properties |
Tensile ≥ 485 MPa, Yield ≥ 170 MPa, Elongation ≥ 40% |
Why Specify 316L Hex Tube
- Molybdenum bearing grade - 2-3% Mo gives clear pitting resistance in salt water, chloride solutions and chemical process lines.
- Low carbon, no sensitisation - 0.03% max carbon keeps welds and heat-affected zones free from carbide precipitation, so parts can be welded without post-annealing.
- No seam to split - the hexagon is drawn from a solid pierced billet, so torque and pressure loads do not open a weld line.
- Sharp hex corners, tight AF - drawn through a hex die to ±0.05mm, giving a precise wrench fit straight from the bundle.
- Full traceability - EN 10204 3.1 mill test certificate with heat number, PMI and intergranular corrosion test available.
Applications
316L hexagonal seamless tube suits chemical valve stems, marine and offshore hardware, food and beverage processing shafts, pharmaceutical fittings, hex socket blanks and heat exchanger components exposed to chlorides.
Processing Services
Cutting to length, chamfering, CNC turning, drilling, threading and electropolishing can be arranged on the same order. Send the drawing and we will quote the finished part instead of the raw tube.
Packing and Delivery
Tubes are packed in woven bags with plastic end caps, then wooden cases or steel-strip bundles for sea freight. Bright surface is protected by interleaving paper or PVC sleeve on request. Delivery is 7-15 days for stock sizes and 20-30 days for special AF sizes and wall thicknesses.
FAQ
Q: What is the difference between this and your 304 hex tube?
A: 316L adds 2-3% molybdenum and lowers carbon to 0.03% max, giving better chloride and intergranular corrosion resistance.
Q: Can the tube be supplied in 6m fixed length?
A: Yes, 3m, 6m and cut-to-length are all available; tolerance on cut length is ±3mm.
Q: Do you offer 316 (not L) grade?
A: 316 and 316L are both available; 316L is recommended when the part will be welded.
Q: What is the minimum order quantity?
A: 1 ton per size, and mixed sizes can be combined in one container.
Send us the across-flats size, wall thickness and length, and we will confirm stock and price within one working day.
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