ASTM A312 TP347H Stainless Steel Seamless Pipes

347H vs 321H / 304H

Choose	When	Watch-outs
347H	Nb-stabilised elevated-temperature austenitic	Match filler / PWHT to grade
321H	Ti-stabilised high-temp option	Not always interchangeable
304H	Unstabilised H-grade	Sensitization risk if welded poorly

Copy-paste RFQ

ASTM A312 / ASME SA312 TP347H seamless pipe NPS/OD: ____ Sch/wall: ____ Length: ____ Qty: ____ Ends: PE/BE MTC: 3.1/3.2 Extras: ____ Destination: ____

Email sales@savoypipinginc.com with destination and any IBR / NACE / TPI notes.

ASTM A312 TP347H Stainless Steel Seamless Pipe

ASME SA312 · UNS S34709 · Nb-stabilised with H-grade carbon

Savoy Piping Inc. supplies ASTM A312 TP347H seamless pipe — H-grade Nb-stabilised austenitic for creep-range refinery and chemical piping.

Grade hub · A312 Seamless · A312 Welded · A213 · A269 · A358 EFW · SS hub · A312 Welded twin

Also see: Stainless steel pipe & tube hub · Seamless pipe · Buttweld fittings · Flanges.

What is A312 TP347H?

347H pipe to A312/SA312 for general corrosive service. Strength guide: per SA-312 TP347H — confirm PO.

Typical applications

• Creep-range refinery piping
• High-temperature welded stainless systems

Selection guidance

Specify only when 347H is on the datasheet — carbon and grain-size controls matter.

ASTM A312 TP347H Stainless Steel Seamless Pipes Range

Chemical Composition of ASTM A312 TP347H Stainless Steel Seamless Pipes

The chemical composition of grade 347 Stainless Steel is outlined in the following table

Mechanical Properties of ASTM A312 TP347H Stainless Steel Seamless Pipes

The Mechanical Properties of grade 347H Stainless Steel Typical Values at 68°F (20°C) are displayed in the following table.

ASTM A312 TP347H Stainless Steel Seamless Pipes Physical Properties

Physical properties of 347H grade stainless steel in the annealed condition

grade Specification Comparison for 347H Stainless Steel Pipes and Tubes

Grade Specifications for 347 grade stainless steel

ASTM A312 TP347H Stainless Steel Seamless Pipes Application

The grade 347 steel can be made into plates, sheets, and coils to be used in the following:

• Aerospace.
• Laboratory benches & equipment.
• Coastal architectural panelling, railings & trim.
• Boat fittings.
• Chemical Processing.
• Heat Exchangers.
• Woven or welded screens for mining, quarrying & water filtration.
• Threaded fasteners.
• Springs.

ASTM A312 TP347H Stainless Steel Seamless Pipes Nominal Bore Sizes

• 1/2" NB in Thickness Schedule 10, Schedule 40, Schedule 80, Schedule 160, Schedule XXS
• 3/4" NB in Thickness Schedule 10, Schedule 40, Schedule 80, Schedule 160, Schedule XXS
• 1" NB in Thickness Schedule 10, Schedule 40, Schedule 80, Schedule 160, Schedule XXS
• 1-1/4" NB in Thickness Schedule 10, Schedule 40, Schedule 80, Schedule 160, Schedule XXS
• 1-1/2" NB in Thickness Schedule 10, Schedule 40, Schedule 80, Schedule 160, Schedule XXS
• 2" NB in Thickness Schedule 10, Schedule 40, Schedule 80, Schedule 160, Schedule XXS
• 2-1/2" NB in Thickness Schedule 10, Schedule 40, Schedule 80, Schedule 160, Schedule XXS
• 3" NB in Thickness Schedule 10, Schedule 40, Schedule 80, Schedule 160, Schedule XXS
• 3-1/2" NB in Thickness Schedule 10, Schedule 40, Schedule 80, Schedule 160, Schedule XXS
• 4" NB in Thickness Schedule 10, Schedule 40, Schedule 80, Schedule 160, Schedule XXS
• 5" NB in Thickness Schedule 10, Schedule 40, Schedule 80, Schedule 160, Schedule XXS
• 6" NB in Thickness Schedule 10, Schedule 40, Schedule 80, Schedule 160, Schedule XXS
• 8" NB in ThicknessSchedule 10, Schedule 40, Schedule 80, Schedule 160, Schedule XXS
• 10" NB in Thickness Schedule 10, Schedule 40, Schedule 80, Schedule 160, Schedule XXS
• 12" NB in ThicknessSchedule 10, Schedule 40, Schedule 80, Schedule 160, Schedule XXS
• 14" NB in Thickness Schedule 10, Schedule 40, Schedule 80, Schedule 160, Schedule XXS
• 16" NB in Thickness Schedule 10, Schedule 40, Schedule 80, Schedule 160, Schedule XXS
• 18" NB in Thickness Schedule 10, Schedule 40, Schedule 80, Schedule 160, Schedule XXS

Frequently asked questions — ASTM A312 TP347H Seamless Pipe

What is ASTM A312 TP347H?

A312 TP347H is austenitic stainless seamless pipe, UNS S34709, for corrosive and high-temperature service as specified.

Seamless or welded?

This page is the seamless product form. Welded/ERW is listed on the twin page when the PO allows.

347H chemistry?

Nb-stabilised with H-grade carbon

Documents?

EN 10204 3.1 MTC standard; 3.2 and TPI on request.

Export & documentation

We supply this product for domestic and export projects with MTC (EN 10204 3.1 standard; 3.2 / TPI on request). Include destination, Incoterms and inspection needs on the RFQ.