Quick Answer
GNEE STEEL's 304L stainless steel pipes cover outer diameters 9.5–2000 mm, wall thickness 0.5–20 mm, and lengths up to 11.8 m, in round, square, and rectangular sections. Relevant standards include ASTM A270 (sanitary), ASTM A249 (heat exchanger), ASTM A312 (industrial), and ASTM A554 (mechanical). Pipes are certified to AD 2000-W0, PED 2014/68/EU, and ISO 9001:2015.
304L Stainless Steel Pipes
GNEE STEEL supplies 304L stainless steel pipes for sanitary, heat-exchanger, industrial, and mechanical applications. 304L is the low-carbon variant of 304 (max 0.03% C), which reduces carbide precipitation in the heat-affected zone during welding and therefore preserves intergranular corrosion resistance without post-weld annealing. This makes 304L the default choice for welded piping in food, beverage, pharma, and many process plants. The page below consolidates the standards, sizes, and certifications so a buyer can match a pipe to its service condition.
Specifications
| Product | 304L Stainless Steel Pipe / Tube |
| Sanitary tube standards | JIS G3447, KS D 3585, ASTM A270, EN 10357 (DIN 11850), AS 1528.1, ISO 2037 (NF A49-249) |
| Heat exchanger tube | ASTM A249 / ASME SA249, GB/T 24593-2009, HG 20537.2 |
| Industrial pipe | ASTM A312, EN 10217-7, GB/T 12771-2008, HG 20537.3 |
| Drinking water tube | GB/T 19228 |
| Mechanical tube | ASTM A554, EN 10296-2 |
| Outer diameter | 9.5 – 2000 mm |
| Wall thickness | 0.5 – 20 mm (customizable) |
| Length | up to 11.8 m per piece |
| Shape | Round, square, rectangular |
| Surface finish | Bright annealed, inside weld bead removed, polished (roughness <0.3 µm available) |
| Testing | Online eddy current (NDT), hydraulic / airtightness |
| Certifications | AD 2000-W0, PED 2014/68/EU, ISO 9001:2015 |
Applications
By service class: sanitary tubing serves food processing, beverage, and sugar mills where a clean, crevice-free bore and low surface roughness are mandatory - ASTM A270 / EN 10357 are the usual specs. Heat-exchanger tubing goes into condensers, boilers, superheaters, and evaporators, where ASTM A249 dominates and consistent wall and cleanliness control heat transfer.
Industrial pipe (ASTM A312) handles petroleum, gas, petrochemical, wastewater, and drainage where corrosion resistance and weldability matter. Mechanical tube (ASTM A554) is used for handrails, balustrades, and structures where appearance and dimensional accuracy lead. 304L's low carbon content is especially important whenever extensive welding is involved and post-weld heat treatment is impractical.
Procurement & Ordering
When requesting a quote, state the application class (sanitary / heat exchanger / industrial / mechanical), the governing standard, outer diameter, wall thickness, length, shape, and required surface finish (e.g., BA or polished to a Ra value). GNEE STEEL performs bright annealing, inside weld bead removal, and precise polishing, with NDT (eddy current and hydrostatic/airtightness) testing. Full material traceability is maintained, and tubes are certified to AD 2000-W0, PED 2014/68/EU, and ISO 9001:2015. Polished tubes are supplied in individual plastic sleeves with capped ends for cleanliness. Confirm stock sizes, polish grade, and lead time with GNEE STEEL.
FAQ
Q: What is the difference between 304 and 304L?
A: 304L has max 0.03% carbon, reducing weld-zone sensitization and preserving corrosion resistance without post-weld annealing.
Q: Which standard applies to my use?
A: Sanitary → ASTM A270/EN 10357; heat exchanger → ASTM A249; industrial → ASTM A312; mechanical → ASTM A554.
Q: What testing do you perform?
A: Online eddy-current inspection and hydraulic/airtightness testing, plus material traceability.
Q: What certifications do you hold?
A: AD 2000-W0, PED 2014/68/EU, and ISO 9001:2015 are stated.
Q: Can you supply polished or sanitary-finish tube?
A: Yes; bright-annealed and polished finishes with roughness under 0.3 µm are available, supplied capped and sleeved.
Q: What sizes are available?
A: OD 9.5–2000 mm, wall 0.5–20 mm, length up to 11.8 m, in round/square/rectangular - confirm stock with GNEE STEEL.
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