Ruby Infra Projects supplies thin wall tubes from 8 mm to 12.7 mm (1/2 inch) outside diameter, with wall thicknesses from 0.5 mm to 1 mm, in stainless steel and in special alloys such as Inconel, Hastelloy, Monel, duplex, titanium and copper-nickel. A thin wall keeps weight and material cost down and suits tubing that is formed, bent or fabricated.
Send the alloy, outside diameter, wall thickness, length and quantity, and the team will confirm availability, lead time and a quotation. Custom specifications and cut-to-length service are available, with material test certificates from Government or NABL-accredited laboratories on every batch, under an ISO 9001:2015 certified quality system.
Sizes are shown in millimetres with approximate inch equivalents.
| Range | Approx. inches | |
|---|---|---|
| Outside diameter (OD) | 8 mm to 12.7 mm | 0.315 to 0.500 in |
| Wall thickness (WT) | 0.5 mm to 1 mm | 0.020 to 0.039 in |
| Length | Cut to your length | - |
For other sizes or a custom specification, send your drawing or requirement with the enquiry.
Choose the alloy from the environment, temperature and chemicals the tube will see. Grade guidance is general; confirm with your design engineer. The grades named are common examples, and availability depends on the alloy and size.
| Alloy | What it is | Where it fits |
|---|---|---|
| 304 | Roughly 18-20% chromium and 8-11% nickel; good general corrosion resistance | General tubing, food, interior and architectural use |
| 304L | Low-carbon 304, carbon limited to about 0.03-0.035%, so welds resist intergranular corrosion | Welded or heat-exposed service |
| 316 / 316L | Adds about 2-3% molybdenum for much better resistance to chlorides and pitting | Marine, coastal, chemical and process environments |
| 321 | Titanium-stabilised; resists intergranular corrosion after exposure to roughly 425-850 C | High-temperature piping, exhaust and heat-exchanger service |
| 309 (Cr23Ni13) | Higher chromium and nickel for better oxidation resistance than 304 at elevated temperature | Intermediate-temperature service |
| 310 (Cr25Ni20) | About 24-26% chromium and 19-22% nickel; strong resistance to oxidation and scaling at very high temperature | High-temperature service |
| Duplex / super duplex (for example 2205, 2507) | Two-phase stainless steels with high strength and good resistance to chloride stress corrosion cracking | Marine, offshore and chemical process service |
| SMO 254 | Super austenitic stainless steel with high molybdenum for strong resistance to pitting and crevice corrosion | Seawater and chloride-rich process service |
| Alloy 20 | Austenitic nickel-iron-chromium alloy with copper and molybdenum, resistant to sulphuric acid | Chemical processing |
| Nickel | Commercially pure nickel, resistant to caustic alkalis | Caustic and chemical service |
| Monel (for example 400) | Nickel-copper alloy resistant to seawater and many acids and alkalis | Marine and chemical service |
| Inconel (for example 600, 625, 718) | Nickel-chromium alloys that resist oxidation and corrosion at high temperature | Furnaces, heat exchangers and high-temperature equipment |
| Incoloy (for example 800, 800H, 800HT) | Nickel-iron-chromium alloys that resist oxidation and carburisation at high temperature | Furnaces, heat exchangers and petrochemical processing |
| Hastelloy (for example C276, C22) | Nickel-molybdenum-chromium alloys with excellent resistance to severe corrosive chemicals | Aggressive chemical processing |
| Titanium | Light and strong, with high resistance to corrosion in seawater and chlorides | Marine and chemical service |
| Copper-nickel (for example 90/10, 70/30) | Copper-nickel alloys that resist seawater corrosion | Seawater and marine service |
| Carbon steel / alloy steel | Non-stainless steels for duty that does not need corrosion resistance | General and high-strength service |
| Other alloys | Any other alloy can be quoted on request | Send your specification |
Incoloy is a trademark of Special Metals. See also our Incoloy and high-temperature tubes page.
Pick the alloy from the corrosion, temperature and chemical conditions: 304 or 316 for general and marine service, duplex or SMO 254 for chloride-rich environments, Inconel or Incoloy for high temperature, and Hastelloy or Monel for aggressive chemicals or seawater. A thinner wall means a lighter, lower-cost tube that forms and bends easily; a thicker wall adds strength and margin for pressure, temperature and fabrication. Confirm the alloy and wall thickness with your design engineer, and tell us the standard so the tube is quoted correctly.
State the specification your project or inspector requires.
| Material | Typical specification |
|---|---|
| Stainless steel (welded) | ASTM A249: welded austenitic steel boiler, superheater, heat-exchanger and condenser tubes |
| Stainless steel (general) | ASTM A269: seamless and welded austenitic stainless steel tubing for general service |
| Nickel and special alloys | The applicable ASTM B-series specification for the alloy; send your specification with the enquiry |
For seamless stainless steel tubes to ASTM A213, A249, A269 and A312, see our seamless stainless steel tubes page.
See our welded stainless steel tubes and seamless stainless steel tubes pages, or Incoloy and high-temperature tubes.
Ruby Infra Projects supplies tubes from 8 mm to 12.7 mm outside diameter in wall thicknesses from 0.5 mm to 1 mm. Send your alloy, size, length and quantity for availability, lead time and a quotation.
Stainless steel grades including 304, 304L, 316, 316L, 321, 309 and 310, plus duplex and super duplex, SMO 254, Alloy 20, nickel, Monel, Inconel, Incoloy, Hastelloy, titanium, copper-nickel, and carbon and alloy steel, with other alloys on request. Availability depends on the alloy and size.
Yes. Ruby Infra Projects supplies Inconel, Hastelloy, Monel, Incoloy and other nickel alloy tubes in thin wall sizes on request. Send the alloy, standard, outside diameter, wall thickness and quantity, and the team will confirm availability and a quotation.
Both are austenitic stainless steels. Grade 304 suits general corrosion resistance. Grade 316 adds about 2-3% molybdenum, which gives much better resistance to chlorides and pitting, so it is preferred for marine, coastal, chemical and process environments.
Thin wall stainless steel tubes in this size range are supplied as welded tube. For other alloys, say whether you need welded or seamless and the team will confirm what is available for your alloy and size. For seamless stainless steel tubes to ASTM A213, A249, A269 and A312, see our seamless tubes page.
Yes. Custom specifications and cut-to-length services are available, backed by in-house cutting, forming, machining, welding and finishing.
Yes. Material test certificates from Government or NABL-accredited laboratories are provided on every batch. State the certificate format you need when you request a quote.
Yes. Ruby Infra Projects supplies customers outside India as well as within India and holds an Import Export Code (IEC). Send the alloy, size range, quantity, destination country or port and shipping terms for a quotation.