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  • No. 2nd, Parsiwada Lane,
    RK Wadi Building,
    Ground Floor, Shop No. 4,
    Mumbai-400004, Maharashtra, India
  • +91 22 2382 2286
  • enquiry@harshsteel.com

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Invar Capillary Tubes

Harsh Steel is a leading manufacturer and supplier for Invar capillary pipes and Invar capillary tubing’s as per standards (ASTM B521 etc). We even stock and supply Invar seamless and welded pipes and tubes, Invar seamless and welded Large Diameter pipes and tubes, Invar U tubes, Invar finned pipes and tubes, Invar heat exchanger pipes and tubes and Invar instrumentation pipes and tubes as per customer requirements and as per standards with Mill TC and NABL inspections for chemical, physical, mechanical properties along with Hydro testing.

We manufacture special sizes of Invar capillary tubing’s also called as Invar surgical tubes which are critical and used in various Instrumentation, Medical and Heat treatment industry.

Types of Other Invar Pipes & Tubes at Our Stock with Sizes:

1. Invar capillary pipes and tubes
Size Available for Nickel 70-30 capillary pipes and tubes – Outside Diameter 0.20mm to 12.0mm x Thickness 0.05mm to 2.00mm x Length 1000mm to 6000mm.

2. Invar Seamless and welded Pipes and tubes
Outside diameter Available for Invar Seamless & welded Pipes & tubes - 1/4" NB to 24" NB
Schedule of Invar Seamless & welded pipes & tubes - SCH5, SCH10, SCH20, SCH30, SCH40, Std, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS
Specifications & Standards for Seamless and welded Pipes and tubes - As per ANSI B16.47, ASTM B521 and Military/ Aerospace Specifications

3. Invar heat exchanger pipes and tubes
Outside Diameter Available for Invar heat exchanger pipes and tubes – 12 mm up to 600 mm with length upto 30 Meters
Schedule of Invar heat exchanger pipes and tubes - SCH5, SCH10, SCH20, SCH30, SCH40, Std, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS
Specifications & Standards for heat exchanger pipes and tubes - As per ANSI B16.47, ASTM B521 and Military/ Aerospace Specifications

4. Invar seamless and welded U tubes
Outside Diameter for Invar seamless and welded U tubes – 6.35 mm OD to 273 mm OD with length upto 30 Meters
Thickness for Invar seamless and welded U tubes – 0.50 mm to 10.00 mm

5. Invar finned pipes and tubes
Outside Diameter for Invar finned pipes and tubes - 1.00″ to 12.75″
Invar finned pipes and tubes Fin Height - 0.375″ to 1.25″
Invar finned pipes and tubes Fin Thickness - 20ga (.035″) to 12ga (.105″)
Invar finned pipes and tubes Fin Pitch- 1 to 7 fins per inch

6. Invar Square pipes and tubes
Size Available for Invar Square pipes and tubes – 10mm x 10mm to 250 x 250mm, other nonstandard sizes available on request with length upto 6 Mtrs
SCH5, SCH10, SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS

7. Invar rectangular pipes and tubes
Outside Diameter Size Available for Invar rectangular pipes and tubes –½" to 12"
Outside Diameter thickness: .049" to .375
Specifications & Standards for Invar rectangular pipes and tubes- ASTM A-554

8. Invar heat treated Annealed pipes and tubes
Outside Diameter Size Available for Invar heat treated Annealed pipes and tubes – 12 mm up to 600 mm with length upto 30 Meters
Schedule of Invar heat treated Annealed pipes and tubes - SCH5, SCH10, SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS
Specifications & Standards for Invar heat treated Annealed pipes and tubes - As per ANSI B16.47, ASTM B521 and Military/ Aerospace Specifications

9. Invar mirror polished pipes and tubes Outside Diameter Size Available for Invar mirror polished pipes and tubes – 12 mm up to 600 mm with length upto 30 Meters
Schedule of Invar mirror polished pipes and tubes - SCH5, SCH10, SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS
Specifications & Standards for Invar mirror polished pipes and tubes - As per ANSI B16.47, ASTM B521 and Military/ Aerospace Specifications

Chemical composition for Invar capillary pipes and tubes:

Iron Bal
Nominal Nickel 36
Nominal Cobalt 0.5
Carbon 0.05
Silicon 0.40
Sulfur 0.015
Chromium 0.25

Surface conditions for Invar capillary pipes and tubes:

  • Invar Bright Annealed capillary pipes and tubes
  • Invar Polished capillary pipes and tubes
  • Invar Annealed & Pickled capillary pipes and tubes
  • Invar Bright Annealed & polished capillary pipes and tubes
  • Invar Electro polishing capillary pipes and tubes


Exports of Invar capillary pipes and tubes

Harsh Steel exports Invar capillary pipes and tubes, Invar large diameter pipes and tubes, Seamless and welded Invar standard pipes and tubes to European Countries, USA and UK. Our Major Exports of Invar pipes are in Iran, Kuwait, Qatar, Oman and Saudi Arabia. We also Export special Invar Seamless and welded finned pipes and Heat Exchanger tubes to Czech Republic, Netherlands, Poland, Germany, Italy and Mozambique