Stainless Steel 316 Tube: manufacturer, stockist and exporter in Mumbai, India
Rajgranth Metal & Alloys supplies stainless steel 316 tube (UNS S31600) from Mumbai and exports it to 18 markets.
What is SS 316 tube?
Tube is specified by actual outside diameter and wall thickness, and covers thin walls and, in welded form, square and rectangular sections that pipe schedules do not reach. SS 316 tube is bought for heat exchangers, instrumentation, process lines and structural and decorative work. SS 316 (UNS S31600, EN 1.4401) adds 2 to 3 percent molybdenum to the 304 chemistry. The molybdenum lifts resistance to pitting and crevice corrosion in chlorides, which is why 316 is the usual upgrade for coastal, marine-splash, chemical and pharmaceutical service.
304 plus 2–3% molybdenum. The standard answer to chlorides and mild acids.
Rajgranth Metal & Alloys lists SS 316 among the grades it supplies and exports from Mumbai.
SS 316 designations and equivalents
| Standard | Designation |
|---|---|
| UNS | S31600 |
| EN / Werkstoff | 1.4401 |
| AISI | 316 |
| JIS | SUS 316 |
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SS 316 chemical composition
Limits are those of the standard named in the table caption. Product-specific standards for pipe, tube and bar carry their own limits, so always confirm the composition on the mill test certificate supplied with the material.
| Element | Carbon | Manganese | Silicon | Phosphorus | Sulphur | Chromium | Nickel | Molybdenum | Nitrogen |
|---|---|---|---|---|---|---|---|---|---|
| Limit | 0.08 max | 2.00 max | 0.75 max | 0.045 max | 0.030 max | 16.00 – 18.00 | 10.00 – 14.00 | 2.00 – 3.00 | 0.10 max |
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SS 316 mechanical properties
| Property | Requirement |
|---|---|
| Tensile strength | 515 MPa minimum |
| Yield strength (0.2% offset) | 205 MPa minimum |
| Elongation in 50 mm | 40% minimum |
| Hardness | 95 HRB maximum (217 HBW) |
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SS 316 tube: sizes and finishes
The published size range, finishes and conditions for tube are set out on the seamless tubes and welded tubes pages, which list every dimension we publish. Sizes outside the range can be produced to order; send the dimensions with your enquiry.
| Parameter | Range |
|---|---|
| Seamless Tubes: Outside diameter | 3.1, 76.2 (mm — larger sizes to order) |
| Seamless Tubes: Wall thickness | 0.71 to 8.0 (SWG, mm) |
| Seamless Tubes: Length | 5 m, 6.5 m (Customised up to 12 m per requirement) |
| Seamless Tubes: Tube ends | Plain, Bevelled |
| Seamless Tubes: Marking | Size, Grade, Specification, Heat number |
| Welded Tubes: Outside diameter | 4.7, 76.2 (mm — larger sizes to order) |
| Welded Tubes: Wall thickness | 0.5 to 3.0 (mm) |
| Welded Tubes: Length | 5 m, 6.5 m (Customised per requirement) |
| Welded Tubes: Tube ends | Plain, Bevelled |
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Standards for SS 316 tube
SS 316 tube is commonly specified to ASTM A213 / ASME SA-213, ASTM A269 and ASTM A249. Commonly specified product standards. Confirm the standard, edition and any supplementary requirements on your order; we supply to the standard you name.
Why buyers choose SS 316 tube
Better chloride resistance than 304
Good resistance to many acids and process chemicals
Retains strength and toughness across a wide temperature range
Where SS 316 tube is used
- Marine and coastal equipment
- Chemical and petrochemical process lines
- Pharmaceutical and food equipment with chloride exposure
- Heat exchangers
- Surgical and medical parts
What to state when you enquire for SS 316 tube
- Outside diameter and wall thickness in mm, and tolerance class
- Seamless or welded
- Section: round, square or rectangular (welded)
- Length, and whether cut to length
- Finish: bright annealed, solution annealed, polished or electropolished
- The standard, and the test certificate required
What to check on SS 316 tube before and after delivery
On SS 316 tube, wall-thickness tolerance, ovality and surface condition decide acceptance, so measure them on the first delivery. For heat-exchanger and instrument duty check the tolerance class and the cleanliness of the bore against your specification. Confirm the composition on the mill test certificate. Grade limits to design around: costs more than 304 because of the nickel and molybdenum and still not suitable for sustained seawater immersion or hot chloride service.
Export of SS 316 tube from India
SS 316 tube is exported from Mumbai to 18 confirmed markets, quoted with the Incoterm and named port.
SS 316 compared with similar grades
Buyers who look at SS 316 tube usually also compare SS 316L, SS 304 and SS 904L. The grade pages below give each one's designations, properties and limits side by side so you can choose for the service rather than the price alone.
FAQ
09Questions answered
- Is 316 worth the extra cost over 304?
- Where chlorides are present, yes, since 304 can pit within months. In dry, clean indoor service the extra cost buys nothing.
- What is the difference between 316 and 316L?
- 316L has at most 0.030 percent carbon against 0.08 percent in 316, which protects welds from sensitisation. Most mills now supply dual-certified material.
- Can SS 316 be used in seawater?
- It tolerates splash and light exposure but can pit under continuous immersion or at warm temperatures. Use super duplex or a nickel alloy for sustained seawater.
- What tolerance can SS 316 tube be supplied to?
- Outside diameter and wall tolerances depend on the product standard and the manufacturing route. State the tolerance class you need and we confirm whether it can be supplied.
- Which standard applies to SS 316 tube?
- SS 316 tube is commonly specified to ASTM A213 / ASME SA-213, ASTM A269 and ASTM A249. Confirm the standard and edition on your order.
- What is the minimum yield and tensile strength of SS 316?
- In the annealed condition, SS 316 has a minimum yield strength of 205 MPa and a minimum tensile strength of 515 MPa, per the standard named in the table above.
- What is the UNS number and EN designation of SS 316?
- Stainless Steel 316 is designated UNS S31600, EN 1.4401, AISI 316 and JIS SUS 316.
- What are the main alloying elements in SS 316?
- To the standard in the composition table, SS 316 carries chromium 16.00 – 18.00, nickel 10.00 – 14.00 and molybdenum 2.00 – 3.00 percent by weight. Confirm the composition on the mill test certificate supplied with your material.
- Do you supply a mill test certificate with SS 316 tube?
- Yes, to EN 10204 3.1 as standard, showing chemistry and mechanical properties against the heat. EN 10204 3.2 with third-party inspection is available on request.
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