Heat exchanger tube

Heat exchanger tube in an extensive range of austenitic stainless steels, duplex stainless steels, nickel alloys, titanium and zirconium, suitable for all types of heat exchangers, such as seawater coolers, condensers, evaporators, heaters and reheaters.

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Sandvik's heat exchanger tube program includes imperial and metric sizes, from outside diameter 12 mm up to 40 mm (0.472 to 1.575 in.). Special sizes can be made to order. Sandvik heat exchanger tube are supplied in straight lengths up to 30 meters, or as U-bent tubes.

Lower life-cycle cost with duplex stainless steels

Sandvik's duplex stainless steel heat exchanger tubes perform exceptionally well in a variety of environments and media common in process industries, resulting in lower life-cycle costs.
Read more about Sandvik duplex stainless steels


Heat exchanger tube materials

The tables show our standard materials for heat exchanger tube. Other grades can be offered on request.

Duplex stainless steels

Sandvik grade UNS ASTM EN no. W.-nr AFNOR
Sandvik 3RE60 S31500 - 1.4424 1.4417 Z2CND18-05-03
Sandvik SAF 2205™ S31803/S32205 - 1.4462 - Z2CND22-05-03
Sandvik SAF 2304® S32304 - 1.4362 1.4362 Z2NC23-04AZ
Sandvik SAF 2707 HD™ S32707 - - - -
Sandvik SAF 2507® S32750 - 1.4410 - -

High-alloy austenitic stainless steels and nickel alloys

Sandvik grade UNS ASTM EN steel no. W.-nr AFNOR
Sanicro® 70 N06600 Alloy 600 - 2.4816 -
Sanicro® 69 N06690 Alloy 690 2.4642*** 2.4642 NC30FE(RCCM)
Sanicro® 60 N06625 Alloy 625 - - -
Sanicro® 41 N08825 Alloy 825 - 2.4858 -
Sanicro® 30 N08800 - 1.4558 1.4558 -
Sanicro® 28 N08028 - 1.4563 1.4563 -
Sandvik 2RK65™ N08904 - 1.4539 1.4539 Z1NCDU25-20-4
254 SMO* S31254 - 1.4547 (1.4529)** -

* 254 SMO is a trademark of Outokumpu OY.
** In brackets, nearest equivalent steel grade
*** Not applicable for tube and pipe. Only for information.

Austenitic stainless steels

Sandvik grade UNS ASTM EN steel no. W.-nr AFNOR
Sandvik 3R12 S30403/S30400 304L/304 1.4306/1.4301 1.4306/1.4301 Z2CN18-10
Sandvik 3R60™ S31603/S31600 316L/316 1.4435/1.4436 1.4435/1.4436 Z2CND17-13
Sandvik 5R75 S31635 316Ti 1.4571 1.4571 (Z6CNDT17-12)**
Sandvik 6R35 S32100/S32109 321/321H 1.4541/1.4940 1.4541/1.4878 (Z6CNT18-10)**

Titanium and Zirconium

Type of material Grade(s)
Titanium Pure titanium and titanium grades:
1, 2, 3, 4, 7, 9, 11, 12, 16, 17, 26 and 28
Zirconium Zirconium 702 (ZR-702)

Product standards

American standards European standards
Sandvik grade ASTM ASME EN VD TÜV
Sandvik SAF 2707 HD™ A-789 SA-789 - -
Sandvik SAF 2507® A-789 SA-789 10216-5 VD TÜV Blatt 508
Sandvik SAF 2205™ A-789 SA-789 10216-5 VD TÜV Blatt 418
Sandvik SAF 2304® A-789 SA-789 10216-5 -
Sandvik 3RE60 A-789 SA-789 - -
Sanicro® 70 B-163 B-167 SB-163 SB-167 - VD TÜV Blatt 305
Sanicro® 69 B-163 B-167 SB-163 SB-167 - -
Sanicro® 41 B-163 B-423 SB-163 SB-423 - -
Sanicro® 30 B-163 B-407  SB-163 SB-407  10216-5 -
Sanicro® 28 B-668 SB-668 10216-5 VD TÜV Blatt 483
Sandvik 2RK65™ A-269 SB-677 10216-5 VD TÜV Blatt 421
254 SMO* A-213 A-269 SA-213 SA-269 10216-5 -
Sandvik 5R75 A-213 SA-213 10216-5 -
Sandvik 3R60 A-213 A-269 SA-213 10216-5 -
Sandvik 3R65 A-213 A-269 SA-213 10216-5 -
Sandvik 6R35 A-213 A-269 SA-213 10216-5 -
Sandvik 3R12 A-213 A-269 SA-213 10216-5 -

Mechanical properties

Mechanical properties for heat exchanger tube grades

Sandvik grade UNS
Proof strength
Tensile strength
Rp0.2 Rm A
MPa/ksi MPa/ksi %
min. min.
Duplex stainless steels
Sandvik SAF 2707 HD™ UNS S32707
Sandvik SAF 2507® UNS S32750
Sandvik SAF 2205™ UNS S31803/S32205
Sandvik SAF 2304® UNS S32304
Sandvik 3RE60 UNS S31500
Nickel alloys and high-alloy austenitic stainless steels
Sanicro® 70 UNS N06600
Sanicro® 69 UNS N06690
Sanicro® 41 UNS N08825
Sanicro® 30 UNS N08800 205 520-690 30
Sanicro® 28 UNS N08028
Sandvik 2RK65™ UNS N08904
254 SMO* UNS S31254
Austenitic stainless steels
Sandvik 5R75 UNS S31635
Sandvik 3R60™ UNS S31603/S31600
Sandvik 6R35 UNS S32100/S32109
Sandvik 3R12 UNS S30403/S30400

U-bent tubes

U-bent heat exchanger tubes

Sandvik stainless heat exchanger tubes can also be delivered as U-bent tubes*, manufactured according to the common heat exchanger standards. Our basic specification is Sandvik spec. 7-2-1179, but we can also use DIN 28179, TEMA RCB 2.31 or various customer specifications. Copies of all specifications are available on request.

Technical parameters

  • OD 12.7- 38 mm
  • Bending radii from 1.5 x OD up to 1,250 mm. Minimum bending radii for OD over 28 mm after agreement.
  • Leg length min. 1,000 mm.
  • Leg length max. 12,000 mm.
  • Heat treatment for radii up to 1,000 mm.

Heat treatment

If specified, we are equipped to carry out heat treatment of bends plus minimum 150 mm of leg.

  • Furnace is computer controlled and all data is recorded.
  • We use an Argon protective atmosphere inside the tubes.
  • We can supply all types of annealing; solution annealing, stress relieving and stabilization.

Measuring, cutting, deburring and cleaning

  • U-bends are measured exactly in accordance with relevant standards.
  • All tubes are cut to the specified leg lengths, ends are deburred and the tubes are internally cleaned with air.
  • Before packing, both ends of U-bends are capped with plastic caps.


  • In strong, open or closed wooden boxes, depending on destination - max 8,000 kg.
  • Ends of tubes protected by plastic caps.
  • Vertical separators for each radius.
  • Chloride free plastic separators between each row, every 2 meters.
  • Each bundle is covered with plastic.
  • Customers can provide a packing drawing or Sandvik can prepare a packing plan.
  • Packing lists, covered with plastic, are placed on each wooden box for easy identification of order details, including exact list of radii and lengths inside.

* Valid for wall thickness less than or equal to 4 mm/0.157 in.


Welding products

Sandvik offers a complete package of welding products for welding of austenitic stainless steels, duplex stainless steels and nickel alloys. The table shows suitable filler metal for a number of different materials. Information about welding of the respective grade is available in the material datasheets.

Sandvik grade Recommended filler metal
Sandvik SAF 2707 HD™
(UNS S32707)
Sandvik 27.7.5.L Sandvik 27.7.5.L Sandvik 27.7.5.L Sandvik 29.5.5.LR
Sandvik SAF 2507®
(UNS S32750)
Sandvik 25.10.4.L Sandvik 25.10.4.L Sandvik 25.10.4.L Sandvik 25.10.4.LR
Sandvik SAF 2205™
Sandvik 22.8.3.L Sandvik 22.8.3.L Sandvik 22.8.3.L Sandvik 22.9.3.LR
Sandvik SAF 2304®
(UNS S32304)
Sandvik 22.8.3.L Sandvik 22.8.3.L Sandvik 22.8.3.L Sandvik 22.9.3.LR
Sandvik 3RE60
(UNS S31500)
Sandvik 22.8.3.L Sandvik 22.8.3.L Sandvik 22.8.3.L Sandvik 22.9.3.LR
Sanicro® 70
(UNS N06600)
Sanicro 72HP Sanicro 72HP Sanicro 72HP Sanicro 71
Sanicro® 69
(UNS N06690)
Sanicro 68HP Sanicro 68HP Sanicro 69HP Sanicro 69
Sanicro® 41
(UNS N08825)
Sandvik 27.31.4.LCu Sandvik 27.31.4.LCu Sandvik 27.31.4.LCu Sandvik 27.31.4.LCuR
Sanicro® 28
(UNS N08028)
Sandvik 27.31.4.LCu Sandvik 27.31.4.LCu Sandvik 27.31.4.LCu Sandvik 27.31.4.LCuR
Sandvik 2RK65™
(UNS N08904)
Sandvik 20.25.5.LCu Sandvik 20.25.5.LCu Sandvik 20.25.5.LCu Sandvik 20.25.5.LCuR
254 SMO*
(UNS S31254)
Sanicro 60 Sanicro 60 Sanicro 60 Sanicro 60
Sandvik 5R75
(UNS S31635)
Sandvik 19.12.3.NbSi Sandvik 19.12.3.Nb Sandvik 19.12.3.Nb Sandvik 19.12.3.LR
Sandvik 3R60™
(UNS S31603/S31600)
Sandvik 19.12.3.LSi Sandvik 19.12.3.L Sandvik 19.12.3.L Sandvik 19.12.3.LR
Sandvik 6R35
(UNS S32100/S32109)
Sandvik 19.9.NbSi Sandvik 19.9.Nb Sandvik 19.9.Nb Sandvik 19.9.NbR
Sandvik 3R12
(UNS S30403/S30400)
Sandvik 19.9.LSi Sandvik 19.9.L Sandvik 19.9.L Sandvik 19.9.LR

* Contact us for recommendation of the most suitable flux.

Extend heat exchanger uptime in oil refineries

Sandvik can help you combat the corrosive elements in sour crude.

Learn more about our high-performance materials for oil refineries