Why Do Heat Exchanger & Desalination Buyers Pick Ganpat Industrial For ASTM A789 Tube?
Since 1997
Mumbai stockist and exporter of pipes, tubes and plates
ISO Certified
ISO 9001:2015 and ISO 14001:2015 systems
Petrofac Approved
PED certified and Petrofac approved supply
Seamless & Welded
Both A789 routes in one order
Export Ready
Heat-traceable tubes, MTC 3.1, sea-worthy packing
ASTM A789 Tube Snapshot
- 1Form: ASTM A789 Seamless Tubes, SA789 welded tube, ASTM A789 ERW tube
- 2Section: Round tube, straight lengths and coils
- 3Size Range: OD 6.35 mm to 114.3 mm • wall 0.89 mm to 12.70 mm
- 4Common Grades: S31803, S32205, S32750, S32760
- 5Standards: ASTM A789 / A789M, ASME SA789, ASTM A1016
- 6Testing: Hydrostatic or eddy current on each tube
ASTM A789 Tubing is duplex stainless tube built to resist stress corrosion cracking. It holds up in chloride-heavy water, so it is a favourite for exchangers, condensers and desalination loops. Ganpat Industrial stocks A789 in seamless and welded form, with full paperwork for each lot. Searching for an ASTM A789 Tube Manufacturer in India? Send us your grade, OD and wall. We source from mill partners and ship with an EN 10204 3.1 certificate.
Mumbai · Duplex Tube Stockist & Exporter
SA789 Duplex Tube Exporter from Mumbai, MTC 3.1
Ganpat Industrial is a trusted ASTM A789 Tube Supplier in India. We stock duplex and super duplex tube for heat exchangers, condensers and desalination plants, and ship to buyers across India and overseas.
- ✓ Since 1997
- ✓ ISO 9001:2015
- ✓ ISO 14001:2015
- ✓ OHSAS 18001:2007
- ✓ PED Certified
- ✓ Petrofac Approved
High Strength SA789 Seamless & Welded Tube Supplier in India with 0.89mm to 12.70mm Wall Thickness
ASTM A789 Tube Specification at a Glance
Pick your grade and size. We confirm stock and lead time on enquiry.
Governing Standard
- ASTM A789 / A789M
- ASME SA789
- General requirements: ASTM A1016 / A1016M
- Seamless and welded tubing
Size Range
- OD: 6.35 mm to 114.3 mm
- Wall: 0.89 mm to 12.70 mm
- Straight lengths, cut to size
- Coil and U-bend on drawing
UNS Grades
- S31803 and S32205 (2205)
- S32750 (2507 super duplex)
- S32760 (Zeron 100 type)
- Other A789 grades on request
Condition
- Solution annealed (heat-treated)
- Annealed & pickled
- Bright annealed
- Cold drawn seamless
Mandatory Testing
- Tension and hardness
- Flaring (seamless) / flange (welded)
- Reverse flattening (welded)
- Hydrostatic or eddy current
Paperwork
- EN 10204 3.1 certificate
- 3.2 with third-party inspector
- Heat-number traceability
- Packing list and invoice
SA789 Bright Annealed Tubes Sizes We Supply: 6.35 mm to 114.3 mm OD
ASTM A789 welded tubing and seamless both run across this range, with wall from 0.89 mm to 12.70 mm.
OD 1/4″
6.35 mm
OD 3/8″
9.53 mm
OD 1/2″
12.70 mm
OD 5/8″
15.88 mm
OD 3/4″
19.05 mm
OD 1″
25.40 mm
OD 1-1/4″
31.75 mm
OD 1-1/2″
38.10 mm
OD 2″
50.80 mm
OD 2-1/2″
63.50 mm
OD 3″
76.20 mm
OD 3-1/2″
88.90 mm
OD 4″
101.60 mm
OD 4-1/2″
114.30 mm
A789 Duplex Coil Tubing Dimensions: Wall Thickness by BWG
Heat exchanger and condenser buyers order by gauge. Here is the conversion in one look.
| BWG | Wall (inch) | Wall (mm) |
|---|---|---|
| 10 | 0.134 | 3.40 |
| 11 | 0.120 | 3.05 |
| 12 | 0.109 | 2.77 |
| 13 | 0.095 | 2.41 |
| 14 | 0.083 | 2.11 |
| 16 | 0.065 | 1.65 |
| 18 | 0.049 | 1.24 |
| 20 | 0.035 | 0.89 |
| Heavy wall | 0.500 | 12.70 |
Types of ASTM A789 Tubing Available
ASTM A789 Seamless Tubes
A789 / SA789
SA 789 Cold Drawn Seamless Tube
Cold Drawn
SA789 Welded Tube
Welded
ASTM A789 ERW Tube
Welded Route
ASTM A789M Duplex Condenser Tube
Condenser
SA 789 Duplex Boiler Tubes
Boiler
A789 Heat Exchanger Tubes
Exchanger
SA 789 Duplex Heater Tubes
Heater
ASTM A789 Tube Weight Chart (kg per metre)
| OD (inch) | OD (mm) | Wall (mm) | Weight kg/m |
|---|---|---|---|
| 1/4″ | 6.35 | 0.89 (20 BWG) | 0.119 |
| 3/8″ | 9.53 | 1.24 (18 BWG) | 0.252 |
| 1/2″ | 12.70 | 1.24 (18 BWG) | 0.348 |
| 5/8″ | 15.88 | 1.65 (16 BWG) | 0.575 |
| 3/4″ | 19.05 | 1.65 (16 BWG) | 0.704 |
| 1″ | 25.40 | 2.11 (14 BWG) | 1.204 |
| 1-1/4″ | 31.75 | 2.11 (14 BWG) | 1.533 |
| 1-1/2″ | 38.10 | 2.77 (12 BWG) | 2.398 |
| 2″ | 50.80 | 2.77 (12 BWG) | 3.260 |
| 2-1/2″ | 63.50 | 3.05 (11 BWG) | 4.518 |
| 3″ | 76.20 | 3.40 (10 BWG) | 6.065 |
| 3-1/2″ | 88.90 | 3.40 (10 BWG) | 7.123 |
| 4″ | 101.60 | 3.40 (10 BWG) | 8.182 |
| 4-1/2″ | 114.30 | 3.40 (10 BWG) | 9.240 |
Formula: (OD − WT) × WT × π × 7.80 / 1000. Actual weight varies with tolerance.
Need ASTM A789 Tube Sized To Your Drawing?Send grade, OD, wall and metres. Quote with MTC 3.1 details comes back fast.
SA789 Seamless Tubes Equivalent Grades Across Standards
American (UNS / ASTM)
- S31803 and S32205 – Duplex 2205
- S32750 – Super Duplex 2507
- S32760 – Super Duplex
- S32304 – Lean Duplex 2304
European (EN / DIN)
- 2205 – EN 1.4462, X2CrNiMoN22-5-3
- 2507 – EN 1.4410, X2CrNiMoN25-7-4
- S32760 – EN 1.4501
- 2304 – EN 1.4362, X2CrNiN23-4
Japan, UK & Sweden (2205)
- JIS – SUS 329J3L
- British Standard – 318S13
- Swedish Standard – SS 2377
- Trade name – SAF 2205
ASTM A789 Duplex Tube Chemical Composition
| UNS | C | Mn | P | S | Si | Ni | Cr | Mo | N | Cu / Others |
|---|---|---|---|---|---|---|---|---|---|---|
| S31803 | 0.030 | 2.00 | 0.030 | 0.020 | 1.00 | 4.5–6.5 | 21.0–23.0 | 2.5–3.5 | 0.08–0.20 | – |
| S32205 | 0.030 | 2.00 | 0.030 | 0.020 | 1.00 | 4.5–6.5 | 22.0–23.0 | 3.0–3.5 | 0.14–0.20 | – |
| S32750 | 0.030 | 1.20 | 0.035 | 0.020 | 0.80 | 6.0–8.0 | 24.0–26.0 | 3.0–5.0 | 0.24–0.32 | 0.50 max |
| S32760 | 0.030 | 1.00 | 0.030 | 0.010 | 1.00 | 6.0–8.0 | 24.0–26.0 | 3.0–4.0 | 0.20–0.30 | 0.50–1.00; W 0.50–1.00 |
Weekly Delivery of ASTM A789 Tube in Below Countries
| Export to | Continent | Shipping time |
|---|---|---|
 Kenya |
Africa | 19 Days |
 Oman |
Asia | 5 Days |
 USA |
North America | 40-60 Days |
 UAE |
Asia | 5 Days |
ASTM A789 ERW Tube Mechanical Properties
| UNS | Tensile Strength | Yield Strength | Elongation in 2 in. / 50 mm, % |
|---|---|---|---|
| S31803 | 90 [620] | 65 [450] | 25 |
| S32205 | 95 [655] | 70 [485] | 25 |
| S32750 | 116 [800] | 80 [550] | 15 |
| S32760 | 109 [750] | 80 [550] | 25 |
Maximum hardness is 290 HBW for S31803 and S32205. Super duplex limits follow the A789 edition on your order.
Physical Properties of A789 Heat Exchanger Tubes
Handy numbers for heat transfer and stress calculations.
Density
~7.8 g/cm³
Duplex 2205 reference
Elastic Modulus
200 GPa
At room temperature
Thermal Conductivity
19 W/m·K
At 20 to 100 °C
Thermal Expansion
13.0 – 13.7 µm/m·K
20 to 100 °C range
Electrical Resistivity
0.85 µΩ·m
At 20 °C
Service Ceiling
316 °C (600 °F)
Embrittlement risk above
Heat Treatment Window for SA789 Tubes
Every tube ships in the heat-treated condition. No exceptions.
S31803 / S32205
1870–2010 °F
1020–1100 °C
S32750
1880–2060 °F
1025–1125 °C
S32760
2010–2085 °F
1100–1140 °C
After The Soak
Rapid Cooling
In air or water
Tests Each ASTM A789 Tube Passes
Extra checks like IGC or PMI can be added at order stage.
Tension Test
Yield, tensile and elongation against the table
Flaring Test
For seamless tubes
Flange Test
For welded tubes
Hardness Test
Brinell or Rockwell
Reverse Flattening
Welded tubes, one test per 450 m of finished tube
Hydrostatic or Eddy Current
Each tube takes one of the two
Buy Hydrostatic & Eddy Current Tested SA 789 Cold Drawn Seamless Tube in Annealed & Pickled Condition for Heat Exchanger & Desalination Use
SA 789 Duplex Boiler Tubes Surface Condition & Finish Options
SA789 bright annealed tubes give a clean bore for heat exchangers. Annealed and pickled suits general process lines.
Annealed & Pickled
Bright Annealed
Cold Drawn Bright
Solution Annealed
Monthly Delivery of ASTM A789 Tube in Below Countries
| Export to | Continent | Shipping time |
|---|---|---|
 Singapore |
Asia | 8 Days |
 Mexico |
North America | 45 Days |
 South Africa |
Africa | 25-30 Days |
| Kenya |
Africa | 19 Days |
Where ASTM A789 Tubes Are Used ?
ASTM A789M Duplex Condenser Tube & Heat Exchanger Tubes are the two big movers for process and desalination buyers.
Heat Exchangers
Condensers
Desalination Plants
Chemical Processing
Gas Processing
Pulp & Paper
Pharmaceutical Equipment
Seawater Equipment
Comparing Duplex Against 316L For Your Exchanger?Tell us the fluid, chloride level and temperature. We will suggest a grade.
Duplex A789 Tube vs 316L Tube
316L Austenitic Tube
- Single-phase austenitic structure
- Min yield 170 MPa (A213 / A269)
- Chloride stress cracking is a real risk
- Wider temperature use
A789 Duplex Tube
- Roughly half ferrite, half austenite
- S31803 min yield 450 MPa
- Written for stress corrosion cracking resistance
- Keep service below 316 °C (600 °F)
Applications of A789 Heat Exchanger Tubes
Condensers & Heat Exchangers
Plumbing & Sanitary Fittings
Marine & Shipboard Piping
Radiator & Automotive Cooling
Musical Instrument Manufacturing
Architectural & Décor Hardware
Refrigeration & AC Components
Electrical Terminal & Ferrule Parts
How SA789 Tubes Are Made ?
Strip or Hollow
Duplex strip or tube hollow checked to grade
Form or Draw
Welded: roll formed and seam welded. Seamless: cold drawn
Size to Final OD
Passes bring OD and wall to the order
Solution Anneal
Heat treated and cooled rapidly
Pickle or Bright Anneal
Clean, passive surface
Test and Mark
Hydrostatic or eddy current, then marking
ASTM A789 Tube Test Certificate Supplied With Every Lot
Mill Test Certificate With Every Shipment
Each lot of ASTM A789 Tubing carries a heat-traceable certificate. Need an independent inspector? Ask for 3.2.
A789 Tubing Export Documentation & HS Code
Clean paperwork keeps your clearance quick.
Mill Test Certificate
EN 10204 3.1 with heat number
Standard
Third-Party Inspection Report
EN 10204 3.2 with your nominated inspector
On Request
Commercial Invoice
Shows the HS code for customs
Standard
Packing List
Bundle, weight and marking details
Standard
Certificate of Origin
For export clearance
Standard
HS Code
7304 41
Seamless cold-drawn stainless tube
HS Code
7306 40
Welded stainless tube, round
Ready To Order SA 789 Duplex Heater Tubes?Share your list. We reply with availability and delivery.
A789 Welded Tube Price: What Moves Your Quote
Get Today’s ASTM A789 Tube PricePrice moves with nickel, molybdenum and size. Share grade, OD, wall and metres for a firm quote.
ASTM A789M Duplex Condenser Tube Packing & Marking for Export
End Caps
Plastic caps keep the bore clean
Bundled & Sleeved
Tubes tied in bundles with a protective wrap
Wooden Case or Pallet
Sea-worthy for container shipment
Marked Per Tube
OD, grade, heat number, wall and length
Find Our Resellers and Stockist Near You
| Continents | Country |
|---|---|
| Africa | Nigeria, Egypt, South Africa, Kenya, Ghana, Ethiopia |
| North America | United States, Canada, Mexico, Cuba |
| South America | Brazil, Argentina, Colombia, Chile, Peru |
| Asia | India, Japan, South Korea, Indonesia, Saudi Arabia, Iran |
| Europe | Germany, France, UK, Italy, Spain, Poland, Ukraine |
| Australia | New Zealand, Papua New Guinea, Fiji, Samoa |
Frequently Asked Questions
What is the ASTM A789 tube price?
It depends on grade, OD, wall, finish and quantity. Send your list on WhatsApp for a current quote.
What ASTM A789 tube sizes do you supply?
OD from 6.35 mm to 114.3 mm and wall from 0.89 mm to 12.70 mm. Other sizes can be offered on drawing.
Is A789 for seamless tube only?
No. A789 covers both seamless and welded ferritic/austenitic stainless steel tubing for general service.
How do A789 tubes differ from A790 pipes?
A789 is tubing and A790 is pipe. Both cover the same duplex family, but A790 is sized by NPS and schedule.
What is the maximum service temperature?
The standard warns of embrittlement with prolonged high-temperature use. A common design ceiling for duplex tube is 316 °C (600 °F).
Can you supply a 3.2 certificate?
Yes. We issue EN 10204 3.1 as standard and arrange 3.2 with your nominated inspector on request.
6 Reasons to choose Ganpat Industrial Corporation
- Distributor of Heat Exchanger parts and Alloys for High Temperature applications.
- Stockholder and importer of Ferrous and non ferrous metals.
- Wide stock of prime quality austenitic and Ferritic Stainless Steel for Extreme pressure environment.
- Marine grade steel at lowest price in Mumbai.
- Compare Price per KG in India and China.
- Offer Resale price to local suppliers, traders and wholesalers in UAE, Saudi Arabia, Egypt, and USA