ASTM A312 TP347 Seamless Stainless Steel Tubing UNS S34700 EN Number 1.4550

Product Details:
Place of Origin: China
Brand Name: VANFORGE
Certification: ISO9001, ISO10012, ISO14001, OHSAS18001, ABS, BV, DNV, Lloyd, NK, PED
Payment & Shipping Terms:
Minimum Order Quantity: 10 metric tons
Price: Negotiable
Packaging Details: Seaworthy package for export
Delivery Time: 60 days
Payment Terms: L/C, T/T
Supply Ability: 1000 metric tons per month

Detail Information

Material: Austenitic Stainless Steel Process: Hot Rolled
Type: Seamless Surface: Pickled
Shape: Round Length: Cut To Length On Request
Treatment: Solution
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ss 316 pipe

Product Description

ASTM A312 TP347 Seamless stainless steel pipe for high temperature service


ASTM A312, TP347 Stainless Steel Pipe

Material Description
UNS S34700

EN Number 1.4550

Chemical Composition, %

C Mn P S Si Cr Ni Nb
.08 2.0 .045 .03 1.0 17.0-20.0 9.0-13.0 10Xc-1.10


TP347 is an austenitic, niobium-stabilized stainless chromium-nickel steel for use at temperatures up to 850°C (1560°F).


Corrosion Resistance

TP347 has with some limitations (nitric acid) the same resistance as the unstabilised steel TP304, i.e. the material has good resistance in:

  • Organic acids at moderate temperatures
  • Salt solutions, e.g. sulphates, sulphides and sulphites
  • Caustic environments at moderate temperatures


TP347 is generally used at temperatures above 500 °C (930 °F), however, where wet corrosion is not relevant.


The stabilisation with niobium gives TP347 good resistance to intergranular corrosion.


The steel may be sensitive to pitting and crevice corrosion even in solutions of relatively low chloride content.



  • Cooling tubes in ammonia converters, because of its good resistance to nitrogen absorption and good corrosion resistance.
  • With its good hot-strength, and good resistance to hydrogen sulphide and intergranular corrosion, TP347 is a suitable material for furnace tubes in refineries.
  • Furnace tubing used in vinyl chloride production is another example of applications in which this steel is often used.


Seamless Tube Information

Specification: ASTM A312 / ASME SA312, EN10216-5, DIN17458

Outside Diameter: 325-1067 mm

Wall Thickness: 9.53-140 mm

Length: On the request



Production procedure

ASTM A312 TP347 Seamless Stainless Steel Tubing UNS S34700 EN Number 1.4550 0

ASTM A312 TP347 Seamless Stainless Steel Tubing UNS S34700 EN Number 1.4550 1

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