304 Stainless Steel Pipe
304 stainless steel pipe is the most widely specified austenitic (18% chromium, 8% nickel) corrosion-resistant tube grade, and GNEE STEEL supplies it across the common ASTM and ASME specifications used in process, architectural, food, and pharmaceutical piping. The "304" designation refers to the base chemistry defined by ASTM A240/A276, while the pipe form is covered by standards such as ASTM A312 for seamless and welded pipe, ASTM A213 for boiler and heat-exchanger tubing, ASTM A269 for general-service tubing, and ASTM A270 for sanitary (hygienic) tubing.
Choosing the right standard depends on where the pipe will be used: a sanitary dairy line, a structural handrail, a heat exchanger, or a chemical transfer line each call for a different specification and finish. Because wall thickness, outer diameter, length, and surface condition vary by order, the figures below are a general reference and must be confirmed with GNEE STEEL against your specification.
Specifications
| Product | 304 stainless steel pipe / tube |
| Grade | 304 / 304L (ASTM A312, A213, A269, A270; ASME SA312 etc.) |
| Outer diameter | 8–219 mm (confirm available sizes with GNEE STEEL) |
| Wall thickness | 0.24–3 mm (confirm with GNEE STEEL) |
| Length | 1–12 m or per customer spec (confirm with GNEE STEEL) |
| Tolerance | OD ±0.2 mm, wall ±0.02 mm, length ±0.5 mm (per source page; confirm with GNEE STEEL) |
| Inspection | EN 10204 / 3.1B (confirm with GNEE STEEL) |
| Type | Seamless or welded (confirm with GNEE STEEL) |
| Surface | Pickled, annealed, polished (BA/2B/No.4) as required |
Reference dimensions (ASME B36.19, standard data)
| Nominal size (in) | OD (mm) | Common wall schedules |
| 1/2 | 21.3 | 5S / 10S / 40S / 80S |
| 3/4 | 26.7 | 5S / 10S / 40S / 80S |
| 1 | 33.4 | 5S / 10S / 40S / 80S |
| 1 1/2 | 48.3 | 5S / 10S / 40S / 80S |
| 2 | 60.3 | 5S / 10S / 40S / 80S |
| 3 | 88.9 | 5S / 10S / 40S / 80S |
| 4 | 114.3 | 5S / 10S / 40S / 80S |
| 6 | 168.3 | 5S / 10S / 40S / 80S |
| 8 | 219.1 | 5S / 10S / 40S / 80S |
Applications
304 pipe serves industries that need reliable corrosion resistance without the cost of higher alloys. In building and architecture it is used for handrails, balustrades, curtain-wall supports, and decorative columns where a bright polished finish is valued. In food and beverage, dairy, and pharmaceutical plants, sanitary 304L tubing to ASTM A270 is chosen for clean-in-place lines because it withstands repeated sterilization. In general industry it carries water, air, mild chemicals, and process fluids at moderate temperature. Heat-exchanger and boiler tubing follows ASTM A213. For chloride-rich or marine environments, 316L is usually preferred over 304; GNEE STEEL can advise when an upgrade is warranted.
Procurement & Ordering
To quote 304 stainless pipe, share the required ASTM/ASME standard, seamless or welded, outside diameter and wall schedule (or exact mm), length, surface finish (pickled, annealed, 2B, No.4, mirror), and any inspection certificate (EN 10204 3.1B). GNEE STEEL supplies from stock and mill runs and will confirm MOQ, lead time, and packing. Pricing tracks nickel and chromium surcharges, fixed at order. Contact GNEE STEEL via the official website or phone to open a quotation and verify current available sizes.
Packaging and Shipping
FAQ
Q: What is the difference between 304 and 304L?
A: 304L is the low-carbon version, better for heavy welding because it reduces carbide precipitation. GNEE STEEL can supply either; confirm which your specification requires.
Q: Which ASTM standard should I choose?
A: A312 for general piping, A213 for heat-exchanger/boiler tubing, A269 for general tubing, A270 for sanitary. GNEE STEEL will confirm the right standard for your use.
Q: Do you supply seamless or welded pipe?
A: Both are available depending on size and standard; confirm with GNEE STEEL for your requirement.
Q: Can you provide mill certificates?
A: Yes, EN 10204/3.1B inspection is offered; confirm certificate needs with GNEE STEEL when ordering.
Q: What sizes are in stock?
A: OD range is 8–219 mm with wall 0.24–3 mm per the product data; exact stock and custom sizes must be confirmed with GNEE STEEL.
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