Why Buyers Source Stainless Steel Seamless Pipe From Us
Supplying Since 2007
Nearly two decades of seamless SS pipe for process plants.
Traceable Heats
Heat number on each length matches its 3.1 MTC.
Ready-to-Ship Sizes
Listed NB sizes leave our Mumbai yard in 24–48 hours.
Cut & End-Prep Service
Exact cut lengths, beveled or threaded ends on order.
Rely On Stainless Steel Pipe Supplier In India For Schedule 10, 40 And 80 Wall Thickness
ASTM A312 / ASME SA312 seamless pipe in eight austenitic grades. Available sizes range from NPS 1/8″ up to 24″. Every heat ships with an EN 10204 3.1 certificate.
We are a stainless steel seamless pipe supplier in India. EPC contractors and fabricators get Sch 10S, 40S, 80S fast. Each pipe is solution annealed, pickled and heat-number marked. Inspectors can trace every length back to its MTC. European orders ship with CE and PED approved documents. Domestic buyers receive GST-compliant invoices with every order.
SS Seamless Pipe at a Glance
GradesTP304 / 304L / 316 / 316L / 321 / 347 / 310S / 317L
StandardASTM A312 / ASME SA312
NPS Range1/8″ to 24″
Outside Diameter10.29 mm – 609.6 mm
Wall ThicknessSch 10S, 40S & 80S (1.24 – 12.70 mm)
TemperSolution Annealed (1040°C min) & Pickled
Alloying ElementsCr–Ni; Cr–Ni–Mo; Ti / Nb stabilised
FormsHot Finished & Cold Drawn
MTCEN 10204 3.1 (3.2 on request)
Third-Party InspectionSGS / BV / TÜV on request
LogisticsEx-Mumbai by road, sea & air
Delivery TimeEx-stock 24–48 hours
Browse Us For SS Seamless Pipe Dimensions, Pressure Rating And Annealed, Pickled Finish Options
As a stainless steel seamless pipe manufacturer in India, we match size, rating and finish. Every length is tested per ASTM A312.
Annealed & Pickled
Default finish for process piping
Bright Annealed
Cold-drawn sizes, clean bore
Mechanically Polished
180 to 600 grit on request
Pressure Tested
Hydro or NDE on every length
Send your NPS, schedule and grade list for a same-day FOB Nhava Sheva rate on stainless steel seamless pipe.
Stainless Steel Seamless Pipe Specification
As a stainless steel seamless pipe supplier in Mumbai. we cover these codes, tests and end preparations.
ASME B36.19M Stainless Steel Pipe Dimensions
Governs OD and wall for 5S, 10S, 40S & 80S
Stainless Steel Tubing for General Service
ASTM A269 seamless tubing on request
High-Temperature Seamless Pipe Option
ASTM A376 H grades for creep-range service
EN 10216-5 Seamless Tube Equivalent
1.4301 / 1.4404 / 1.4541, hot- or cold-finished
CE Approved SS Seamless Pipe
PED 2014/68/EU approved supply documentation
Sour-Service Stainless Pipe Compliance
NACE MR0175 / ISO 15156 on request
Hydro-Tested Seamless Pipe Lengths
Hydrostatic or NDE electric test (ET / UT) per length
IGC Tested Stainless Tube
ASTM A262 Practice E (Supplementary S7)
Bright Annealed & Polished Pipe Surface
Bright annealed, 180–600 grit polish, mirror on request
Beveled End SS Pipe Preparation
Plain, 37.5° bevel (ASME B16.25), NPT thread (B1.20.1)
Random Length Pipe Supply
15–24 ft random (NPS 1/8–8) or exact cut
IBR Approved Stainless Steel Pipe (India)
IBR documentation on request for boiler lines
Stainless Steel Pipe Size Chart
OD and wall per ASME B36.19M, with plain-end weight in kg/m.
W (kg/m) = (OD − WT) × WT × 0.02491
| NPS | OD (mm) | Sch 10S WT (mm) | 10S (kg/m) | Sch 40S WT (mm) | 40S (kg/m) | Sch 80S WT (mm) | 80S (kg/m) |
|---|---|---|---|---|---|---|---|
| 1/8″ | 10.29 | 1.24 | 0.28 | 1.73 | 0.37 | 2.41 | 0.47 |
| 1/4″ | 13.72 | 1.65 | 0.50 | 2.24 | 0.64 | 3.02 | 0.80 |
| 3/8″ | 17.15 | 1.65 | 0.64 | 2.31 | 0.85 | 3.20 | 1.11 |
| 1/2″ | 21.34 | 2.11 | 1.01 | 2.77 | 1.28 | 3.73 | 1.64 |
| 3/4″ | 26.67 | 2.11 | 1.29 | 2.87 | 1.70 | 3.91 | 2.22 |
| 1″ | 33.40 | 2.77 | 2.11 | 3.38 | 2.53 | 4.55 | 3.27 |
| 1-1/4″ | 42.16 | 2.77 | 2.72 | 3.56 | 3.42 | 4.85 | 4.51 |
| 1-1/2″ | 48.26 | 2.77 | 3.14 | 3.68 | 4.09 | 5.08 | 5.46 |
| 2″ | 60.33 | 2.77 | 3.97 | 3.91 | 5.50 | 5.54 | 7.56 |
| 2-1/2″ | 73.03 | 3.05 | 5.32 | 5.16 | 8.72 | 7.01 | 11.53 |
| 3″ | 88.90 | 3.05 | 6.52 | 5.49 | 11.41 | 7.62 | 15.43 |
| 3-1/2″ | 101.60 | 3.05 | 7.49 | 5.74 | 13.71 | 8.08 | 18.82 |
| 4″ | 114.30 | 3.05 | 8.45 | 6.02 | 16.24 | 8.56 | 22.55 |
| 5″ | 141.30 | 3.40 | 11.68 | 6.55 | 21.99 | 9.52 | 31.25 |
| 6″ | 168.28 | 3.40 | 13.96 | 7.11 | 28.54 | 10.97 | 42.99 |
| 8″ | 219.08 | 3.76 | 20.17 | 8.18 | 42.97 | 12.70 | 65.29 |
| 10″ | 273.05 | 4.19 | 28.06 | 9.27 | 60.91 | 12.70 | 82.36 |
| 12″ | 323.85 | 4.57 | 36.35 | 9.52 | 74.54 | 12.70 | 98.43 |
| 14″ | 355.60 | 4.78 | 41.77 | — | — | — | — |
| 16″ | 406.40 | 4.78 | 47.82 | — | — | — | — |
| 18″ | 457.20 | 4.78 | 53.87 | — | — | — | — |
| 20″ | 508.00 | 5.54 | 69.34 | — | — | — | — |
| 22″ | 558.80 | 5.54 | 76.35 | — | — | — | — |
| 24″ | 609.60 | 6.35 | 95.42 | — | — | — | — |
Stainless Steel Pipe Tolerance as per ASTM A999
Permitted OD, wall and length variation on A312 seamless pipe. Inspectors check these at receipt.
OD – NPS 1/8″ to 1-1/2″
+0.4 / −0.8 mm
OD – over 1-1/2″ to 4″
+0.8 / −0.8 mm
OD – over 4″ to 8″
+1.6 / −0.8 mm
OD – over 8″ to 18″
+2.4 / −0.8 mm
OD – over 18″ to 26″
+3.2 / −0.8 mm
Wall Thickness
−12.5% of nominal
Exact Cut Length
+6.4 / −0 mm
Random Length
Single / double random
Stainless Steel Seamless Pipe Manufacturer in Mumbai With 19 Years of Mill-Certified Supply
Tell us the NPS, schedule and grade, and we confirm stock the same day.
SS Seamless Pipe Chemical Composition
Heat-analysis limits per ASTM A312 Table 1. The grade cards below show how each grade differs.
UNS S32100
- Carbon (C)0.08 max
- Chromium (Cr)17.0–19.0
- Nickel (Ni)9.0–12.0
- Ti / NTi 5×(C+N) min, 0.70 max; N 0.10 max
Stainless Pipe PREN & Pitting Resistance
Higher PREN means better resistance to chloride pitting. Use it to shortlist a grade for seawater or brine lines.
PREN = %Cr + 3.3 × %Mo + 16 × %N
Seamless vs Welded Stainless Steel Pipe
Gulf projects often specify “SMLS” in the piping class. Here is what it changes.
Seamless
Chosen for critical pressure service
- Made FromHot-pierced or extruded billet
- Weld SeamNone at any stage
- B31.3 Joint Factor1.00
- Best FitSour, cyclic & high-pressure lines
VS
Welded
Budget option for utility service
- Made FromFormed strip, no filler weld
- Weld SeamOne longitudinal seam (NPS 14 & below)
- B31.3 Joint FactorBelow 1.00 unless weld fully radiographed
- Best FitLow-pressure & large-bore runs
Types of SS Seamless Pipe
As a stainless steel seamless pipe stockist in India, we hold every finish and wall. Pick a form and add it to your enquiry.
ASTM A312 TP304 Seamless Pipe
- General corrosive service workhorse
- Dual 304/304L cert on request
- Sch 10S to 80S walls
SS 316L Seamless Pipe
- Molybdenum for chloride pitting
- Low carbon for weld zones
- Common in marine & pharma
Hot Finished Stainless Steel Pipe
- Larger OD & heavier walls
- Annealed and pickled surface
- Economical for process headers
Cold Drawn Seamless SS Tube
- Closer OD & wall control
- Smoother bore finish
- Suits instrument & hydraulic lines
Bright Annealed SS Pipe
- Annealed in protective atmosphere
- No pickling needed after anneal
- Clean bore for purity service
Polished Stainless Steel Pipe
- 180 to 600 grit options
- Mirror finish on request
- Food, dairy & visible runs
Thick Wall Stainless Steel Seamless Pipe
- Sch 80S for pressure duty
- Takes NPT threading
- High-pressure utility lines
ASME SA312 TP321 Pipe
- Titanium-stabilised grade
- Holds up in 425–815°C range
- Refinery furnace & hot lines
Heat Exchanger SS Seamless Tube
- Thin wall stainless steel tube
- U-bend & straight lengths
- Shell-and-tube bundles
How Seamless Stainless Tube Is Made
Four mill stages turn a solid billet into weld-free SS pipe.
Hot Piercing
Heated round billet pierced or extruded into a hollow shell.
Hot Finish or Cold Draw
Rolled hot for large OD, or cold drawn / pilgered for tight size.
Solution Anneal
1040°C min, rapid quench, then pickled or bright annealed.
Test & Mark
Straightened, hydro / NDE tested, stencilled with heat number.
SS Seamless Pipe Stockist Holding Ready Racks in Mumbai Since 2007
Pick 304L or 316L lengths off the rack instead of waiting for a mill slot.
SS Seamless Pipe Pressure Rating
Internal pressure for seamless TP304 / TP316 pipe up to 38°C.
Schedule 10S vs 40S vs 80S Stainless Pipe
Pick the lightest schedule your pressure and joint type allow. Walls shown for NPS 1/2″ to 12″.
Sch 10S
Thin wall, lowest weight
- Wall Range2.11 – 4.57 mm
- 2″ Weight3.97 kg/m
- JoiningButt weld only, no threading
- Best FitLow-pressure, CIP & utility
Sch 40S
Standard process wall
- Wall Range2.77 – 9.52 mm
- 2″ Weight5.50 kg/m
- JoiningButt weld, socket weld
- Best FitGeneral process piping
Sch 80S
Extra-strong wall
- Wall Range3.73 – 12.70 mm
- 2″ Weight7.56 kg/m
- JoiningPreferred for NPT threading
- Best FitHigh-pressure & small bore
SS Round Pipe Mechanical Properties
Minimum values per ASTM A312 / ASME SA312. Standard and L grades have separate strength levels.
515MPa min
Tensile – TP304, 316, 317L, 321, 347, 310S
485MPa min
Tensile – TP304L, TP316L
205 / 170MPa min
Yield – standard / L grades
35 / 25% min
Elongation – longitudinal / transverse
Stainless Steel Pipe Temperature Range by Grade
Match the grade to the operating temperature band before you fix the piping class.
−196°C to −29°C
304L / 316L for LNG & cryogenic lines
−29°C to 425°C
304/L, 316/L for general process
425°C to 815°C
321, 347 or H grades
Up to ~1100°C
310S for oxidation
ASTM A312 vs A376 vs EN 10216-5
Canadian projects mix US and EU specs. Here is which standard fits which job.
ASTM A312
Seamless, welded & heavily cold-worked pipe
- Intended ServiceHigh-temperature & general corrosive
- Common GradesTP304/L, TP316/L, TP321, TP347
- DimensionsASME B36.19 (NPS 1/8–30 listed)
- Piping CodeListed in ASME B31.3
ASTM A376
Seamless pipe only
- Intended ServiceHigh-temperature, first written for power stations
- Common GradesH grades & nitrogen grades
- Wall NoteTP321 strength lower above 9.5 mm wall
- Piping CodeListed in ASME B31.3
EN 10216-5
Seamless stainless tubes for pressure purposes
- Intended ServicePressure equipment to European rules
- Common Grades1.4301, 1.4404, 1.4541, 1.4571
- Finish RouteHot-finished or cold-finished
- Typical UsePED 2014/68/EU equipment
Seamless Stainless Steel Pipe Exporter in India to Saudi Arabia & Dammam Port
Export bundles are wrapped, end-capped and heat-tagged for quicker customs checks.
SS Seamless Pipe Equivalent Grades
Match your ASTM grade to its UNS, EN and JIS equivalent before ordering.
304
UNS S30400 · JIS SUS 304
1.4301 / X5CrNi18-10
304L
UNS S30403 · JIS SUS 304L
1.4307 (1.4306) / X2CrNi18-9
316
UNS S31600 · JIS SUS 316
1.4401 / X5CrNiMo17-12-2
316L
UNS S31603 · JIS SUS 316L
1.4404 / X2CrNiMo17-12-2
321
UNS S32100 · JIS SUS 321
1.4541 / X6CrNiTi18-10
347
UNS S34700 · JIS SUS 347
1.4550 / X6CrNiNb18-10
310S
UNS S31008 · JIS SUS 310S
1.4845 / X8CrNi25-21
317L
UNS S31703 · JIS SUS 317L
1.4438 / X2CrNiMo18-15-4
Seamless SS Pipe Testing & Inspection
Tests we run or arrange before stainless steel seamless tube leaves Mumbai.
PMI (XRF)
Confirms Cr, Ni & Mo
Hydrostatic Test
Per ASTM A999
Eddy Current / UT
ASTM E426 / E213
IGC Test
ASTM A262 Practice E
Flattening Test
Ductility check per A312
Dimensional & Visual
OD, wall, length, surface
SS Pipe HSN Code & GST Rate
As a stainless steel seamless pipe exporter, we print the correct HS code on every invoice.
HS 7304.41
SS seamless • cold-drawn or cold-rolled
HS 7304.49
SS seamless • hot-finished & other
HS 7304.11
SS line pipe • oil & gas pipelines
India GST 18%
IGST 18% • or CGST 9% + SGST 9%
ITC-HS 8-Digit
73044100 • 73044900
Shipping Documents
Invoice, packing list • MTC & origin certificate
SS Pipe Marking & Export Packing
Every stainless seamless pipe length carries a stencil that links it to its MTC.
MILL / BRAND ASTM A312 / ASME SA312 TP316L SMLS 2″ SCH 40S HEAT NO. LENGTH
End Caps
Plastic caps on both ends
Bundling
Non-carbon straps, no iron pickup
Wooden Box
ISPM-15 treated for export
Heat Tag
Grade, size & heat no. per bundle
SS Seamless Pipe Price Per Kg
Pipe is priced per kg but ordered per length. Use these 20 ft weights to find cost per length.
Price per 20 ft = kg/m × 6.096 × rate per kg
1/2″ Sch 40S
7.8 kg per 20 ft length
1″ Sch 40S
15.4 kg per 20 ft length
2″ Sch 10S
24.2 kg per 20 ft length
2″ Sch 40S
33.5 kg per 20 ft length
2″ Sch 80S
46.1 kg per 20 ft length
3″ Sch 40S
69.5 kg per 20 ft length
4″ Sch 40S
99.0 kg per 20 ft length
6″ Sch 40S
174.0 kg per 20 ft length
How to Identify Genuine Seamless Stainless Pipe
Welded pipe is sometimes sold as seamless. Four quick checks at goods receipt.
Check 1
No Weld Line in Bore
Shine a torch inside. Seamless has no straight seam or bead.
Check 2
Stencil Says SMLS
Reject lengths marked WLD, EFW or ERW on a seamless PO.
Check 3
Heat No. Matches MTC
Stencil heat number must appear on the 3.1 certificate.
Check 4
PMI Shows Molybdenum
316 / 316L must read 2–3% Mo. No Mo means it is 304.
SS Seamless Pipe Applications
Plants that choose seamless when pressure, purity or temperature matter.
ASME SA312 Pipe Supplier in Chennai With CE & PED 2014/68/EU Documents
Pressure-equipment builders get PED-ready paperwork alongside the 3.1 MTC.
Where We Ship
Stainless Steel High Pressure Pipe Supply Network
As one of the trusted stainless steel seamless pipe suppliers in Saudi Arabia, we ship from Mumbai to these markets.
INPune
INAhmedabad
INRajkot
INGujarat
INDelhi
INGhaziabad
INBengaluru
INChennai
INKolkata
INNagpur
SADammam, Saudi Arabia
AEDubai, UAE
AEAbu Dhabi, UAE
TRIstanbul, Turkey
DEGermany
ITItaly
NLNetherlands
CACanada
MXMexico
VEVenezuela
MYMalaysia
THThailand
VNVietnam
IDIndonesia
PHPhilippines
ZADurban, South Africa
KENairobi, Kenya
UGKampala, Uganda
SS Pipe Delivery Time
As a stainless steel seamless pipe stockist in Mumbai, we work to these lead times.
- From Mumbai stock
- Ships in 24–48 hours
- Listed sizes only
- FCL or LCL, Nhava Sheva
- 12–18 days to Gulf & Africa
- Lowest cost per tonne
- For urgent shutdowns
- 3–5 days to site
- Small lots only
- Set by your port
- Includes clearance time
- Confirmed with order
SS Seamless Pipe FAQs
Straight answers to what procurement teams ask before they raise a PO.
What sizes does stainless steel seamless pipe come in?
- NPS 1/8″ to 24″ (OD 10.29–609.6 mm)
- Sch 10S, 40S & 80S per ASME B36.19M
- 40S and 80S listed up to NPS 12
Which specification covers stainless steel seamless pipe?
- ASTM A312 / ASME SA312 for most process piping
- ASTM A376 for high-temperature seamless
- EN 10216-5 for European pressure equipment
What decides stainless steel seamless pipe price per kg in India?
- Grade – nickel & molybdenum content
- Size, schedule & finish
- Certification level & order quantity
What is the HS code for stainless steel seamless pipe?
- 7304.41 – cold-drawn or cold-rolled
- 7304.49 – hot-finished & other
- India GST rate: 18%
Is your stainless steel seamless pipe CE and PED approved?
- CE & PED 2014/68/EU approved documentation
- EN 10204 3.1 MTC with every heat
- 3.2 with third-party inspection on request
How fast can you ship to Saudi Arabia or the UAE?
- Ex-stock: 24–48 hours from Mumbai
- Sea freight: about 12–18 days
- Air freight: about 3–5 days
Is stainless steel seamless pipe magnetic?
- Annealed 304 / 316 is non-magnetic
- Cold working can make it slightly magnetic
- Use PMI, not a magnet, to confirm grade
What is the difference between SS pipe and SS tube?
- Pipe: sized by NPS & schedule (ASTM A312)
- Tube: sized by exact OD & wall (A213 / A269)
- Tube has tighter tolerances
Can 316L seamless pipe replace 304?
- Yes, 316L upgrades corrosion resistance
- Same dimensions under ASME B36.19M
- Check with the engineer if 304 is specified
