Amigo Impex is a Stainless Steel Pipes & Tubes manufacturer, supplier, stockist and exporter working out of Mumbai, India, since 2013. Cutting, machining, threading, fabrication, testing and packing run under one roof.
Stainless steel pipes and tubes are corrosion-resistant tubulars built on a minimum of 10.5% chromium, which forms a self-repairing passive film. Nickel holds the austenitic structure stable, and molybdenum in the 316 family sharpens resistance to chloride pitting. Pipe is manufactured to ASTM A312 / ASME SA-312, with electric fusion-welded pipe to ASTM A358 / ASME SA-358, while tube ships against dedicated ASTM tube specifications. 11 grades make up the supplied range: the austenitic set of 304, 304L, 310, 316 & 316L, 317 & 317L, 321, 347 and 904L, plus the precipitation hardening trio of 15-5 PH, 17-4 PH and PH 13-8 Mo. Pipe spans 1/8" to 24" NB, with Schedules 10S, 40S and 80S available up to 12" NB and Schedule 10S from 14" to 24" NB. Weights and pressure ratings follow ASME rules.
Amigo Impex stocks seamless, welded, and EFW tubulars in Mumbai. We turn over 60 to 70 tonnes of ready inventory to chemical processors, dairies, shipyards, and pump builders. Each heat links directly to its mill test certificate, backed by AS 9120B, ISO 9001:2015 and ISO 45001:2018 certifications. As an established stainless steel pipe manufacturer, our facility processes orders with fast dispatch turnaround across all standard sizes.
Grade, dimension, construction and finish set the rate of every SS pipes & tubes enquiry. The envelope below fixes all four; the standards table follows.
Service condition decides which document an order for stainless steel pipe or tube certifies against; each standard below carries a defined scope.
| Standard | Scope |
|---|---|
| ASTM A312 / ASME SA-312 | Seamless, welded and heavily cold-worked austenitic pipe |
| ASTM A358 / ASME SA-358 | Electric-fusion-welded austenitic pipe rolled from plate, for corrosive or high-temperature service, supplied in Classes 1 to 5 |
| ASTM A213 / ASME SA-213 | Seamless boiler, superheater and heat exchanger tube |
| ASTM A249 / ASME SA-249 | Welded boiler, heat exchanger and condenser tube |
| ASTM A269 | Seamless and welded tubing for general service |
| ASTM A270 | Sanitary tubing |
| ASTM A554 | Welded mechanical and ornamental tubing |
| ASTM A564 / A564M | Age-hardening stainless steel, covering Type 630 (17-4 PH), Type XM-12 (15-5 PH) and Type XM-13 (PH 13-8 Mo), supplied as mechanical tubing or hollow bar in specified heat treatment conditions |
The following grades of SS tubes and pipes span two metallurgical families, austenitic and precipitation-hardening, each grade answering a different corrosion and strength duty.
SS 304 pipe, UNS S30400, handles general corrosion duty in water, food and atmospheric service; it's the default austenitic choice.
The low-carbon 304L variant, UNS S30403, resists sensitisation at weld seams; fabricated spools need no post-weld annealing.
SS 310 tube, UNS S31000, carries 25% chromium with 20% nickel for furnace, radiant tube and flue gas duty, with carbon up to 0.25% lifting creep strength at sustained temperature; it is supplied as mechanical tubing rather than as pressure pipe to ASTM A312.
Molybdenum at 2 to 3% separates 316 and 316L pipe, UNS S31600 and S31603, from 304 in chloride and marine exposure.
A heavier molybdenum load of 3 to 4% takes 317 and 317L tubes past 316L in scrubbers and aggressive chloride streams.
SS 321 pipe, UNS S32100, is titanium stabilised for cyclic service between 425°C and 815°C, where unstabilised grades sensitise.
Grade 347, UNS S34700, stabilises with niobium instead, keeping weld zones sound through thermal cycling in refinery circuits.
SS 904L pipe, UNS N08904, is the super austenitic option: high nickel plus copper defends against sulphuric and phosphoric acid.
15-5 PH tubulars, UNS S15500, sit in the martensitic precipitation-hardening family, pairing high tensile strength with sound corrosion resistance.
17-4 PH material, UNS S17400, age-hardens after machining and serves pump shafts, sleeves and valve internals.
PH 13-8 Mo, UNS S13800, adds molybdenum to the precipitation hardening system for aerospace and defence hardware.
An enquiry written as nominal bore plus schedule reads as pipe; one written as outside diameter plus wall reads as tube. Both envelopes sit below.
| Dimension | Range |
|---|---|
| Pipe Nominal Bore | 1/8" to 24" NB |
| Pipe Schedules | 10S, 40S, 80S up to 12" NB; 10S from 14" to 24" NB |
| Tube Outside Diameter | 1/8" to 8" (ASTM A213 tube: 5" OD maximum) |
| Tube Wall Thickness | 0.015" to 0.500" |
Each figure below is theoretical, worked from OD, wall and the 7.93 g/cm³ density of austenitic stainless steel.
| NPS | OD (mm) | SCH 10S Wall (mm) | SCH 10S kg/m | SCH 40S Wall (mm) | SCH 40S kg/m |
|---|---|---|---|---|---|
| 1/2" | 21.3 | 2.11 | 1.01 | 2.77 | 1.28 |
| 2" | 60.3 | 2.77 | 3.97 | 3.91 | 5.49 |
| 8" | 219.1 | 3.76 | 20.17 | 8.18 | 42.98 |
No single catalogue number rates a stainless steel line. Allowable working pressure comes from diameter, wall, grade and temperature, using the references below.
| Rating Input | Governing Reference |
|---|---|
| Allowable stress for each grade at temperature | ASME BPVC Section II, Part D |
| Schedule and wall thickness dimensions | ASME B36.19M |
| Pressure design of process piping | ASME B31.3 |
| Mill hydrostatic or non-destructive test | ASTM A312 |
4 constructions of stainless steel tubes and pipes are quoted separately; matching stainless steel pipe fittings complete the package.
Contact Amigo Impex to get current pricing from a reliable stainless steel pipe stockist based on your required grade, size, schedule and quantity.
Request a QuoteFull lengths of stainless steel pipes & tubes travel as strapped bundles with end caps; cut pieces go into timber crates, and small-bore tubing ships boxed for export. Grade, size, specification and heat number are marked on every length. As a reliable stainless steel pipe distributor, dispatch from Mumbai reaches pan-India; exports move to the USA, the Gulf, Europe and Asia. Stock clears in 1 to 2 days; made-to-order runs close to 30 days.
As a trusted stainless steel pipe supplier, we verify that the chemical analysis, tensile testing and hydrostatic or non-destructive examination required by ASTM A312 have been completed and recorded at the mill before the material is released to stock. In-house, we check dimensions, marking, surface condition and heat traceability, and arrange third-party check analysis on request. Each order of SS pipes and tubes carries an EN 10204 3.1 mill test certificate with the original mill analysis beside our own results. Third-party inspection is supported, and certifications held cover AS 9120B, ISO 9001:2015 and ISO 45001:2018.
60–70 tonnes held in Mumbai, with urgent requirements dispatched within one to two days.
AS 9120B, PED, ISO 9001:2015 and ISO 45001:2018, with an MTC on every order.
Cutting, machining, threading, fabrication and testing all handled at our own Mumbai facility.
Original mill certificates plus our own test reports, so every batch can be traced back.
Non-standard sizes and specifications made to order.
Dispatched from Mumbai to every major Indian city, and exported to USA, Gulf, Europe, Asia
A stainless steel pipe is sized by nominal bore and schedule; a stainless steel tube is sized by the actual outside diameter and wall thickness.
Choose 316 stainless steel pipe against chlorides, brine or coastal exposure, because its molybdenum resists pitting. The 18/8 grade 304 covers general water and food duty at a lower cost.
Stainless steel isn't used for all piping because carbon steel costs less where corrosion is mild; the alloy content pays off in corrosive media, hygiene-critical lines and high-temperature service.
Stainless steel pipes and tubes provide exceptional corrosion resistance and hygiene, making them critical components across demanding industrial sectors.
