Stainless Steel Bright Annealed Tube A269 TP316L 316H TP304H TP347H High Strength Capillary Tubing Seamless Welded Type

Stainless Steel Bright Annealed Tube A269 TP316L 316H TP304H TP347H High Strength Capillary Tubing Seamless Welded Type

TP347 Stainless Steel Pipes and Tubes TP347 Stainless Steel is variant of the basic austenitic 18/8 Grade 304 with added Columbium - the introduction of Columbium stabilizes the steel and eliminates carbide precipitation which subsequently causes intergranular corrosion. The steel has excellent forming and welding qualities and excellent toughness even at cryogenic temperatures. Benefits of TP347 Stainless Steel Higher creep stress and rupture properties when compared with TP304 Ideal for high temperature service Overcomes sensitization and intergranular corrosion concerns Can be used in elevated temperature applications for ASME Boiler and Pressure Vessel Code applications Due to stabilisation the material offers better overall corrosion resistance when compared to 304/304L Excellent mechanical properties A high carbon version (TP347H) is also available

Typical Uses

• Heat exchangers
• High temperature steam service
• High temperature chemical process

Both TP347/347H are used primarily in elevated temperature applications.

Product Range

Specifications: ASTM A/ASME SA213/A249/A269/A312/A358 CL. I to V ASTM A789/A790
Sizes (Seamless): 1/2" NB - 24" NB
Sizes (ERW): 1/2" NB - 24" NB
Sizes (EFW): 6" NB - 100" NB

Wall Thickness available:
Schedule 5S - Schedule XXS (heavier on request)

Other Materials Testing:

NACE MR0175, H2 SERVICE, OXYGEN SERVICE, CRYO SERVICE, etc.

Dimensions:

All Pipes is manufactured and inspected/tested to the relevant standards including ASTM, ASME and API etc.

General Properties of 347 Stainless Steel Pipes and Tubes

Alloys 321 (S32100) and 347 (S34700) are stabilized stainless steels which offer as their main advantage an excellent resistance to intergranular corrosion following exposure to temperatures in the chromium carbide precipitation range from 800 to 1500⁰F (427 to 816⁰C). Alloy 321 is stabilized against chromium carbide formation by the addition of titanium. Alloy 347 is stabilized by the addition of columbium and tantalum.

While Alloys 321 and 347 continue to be employed for prolonged service in the 800 to 1500⁰F (427 to 816⁰C) temperature range, Alloy 304L has supplanted these stabilized grades for applications involving only welding or short time heating.

Alloys 321 and 347 stainless steels are also advantageous for high temperature service because of their good mechanical properties. Alloys 321 and 347 stainless steels offer higher creep and stress rupture properties than Alloy 304 and, particularly, Alloy 304L, which might also be considered for exposures where sensitization and intergranular corrosion are concerns. This results in higher elevated temperature allowable stresses for these stabilized alloys for ASME Boiler and Pressure Vessel Code applications. The 321 and 347 alloys have maximum use temperatures of 1500⁰F (816⁰C) for code applications like Alloy 304, whereas Alloy 304L is limited to 800⁰F (426⁰C).

High carbon versions of both alloys are available. These grades have UNS designations S32109 and S34709.

Chemical Composition of 347 Stainless Steel Pipes and Tubes
Represented by ASTM A240 and ASME SA-240 specifications.