347 / 347H Stainless Steel Pipes

347H stainless steel pipe is a high carbon austenitic stainless steel pipe, with an excellent heat-resistance material which is applied to boiler, heat exchanger, car and aircraft exhaust, chemical equipment etc. As a higher grade from AISI 321H, the intergranular corrosion of 347H is achieved through the use of niobium (Nb) as a stabilizing element to maximize this feature.  SS 347 has a good mechanical properties welding performance, excellent resistance to intergranular corrosion .

ASTM A312, ASTM A269, ASTM A213, ASTM A249, ASTM A358, EN10216-5, EN10217-7, DIN 17456, DIN 17455, GOST 9941, JIS G3459, JIS G3463 etc.

 

Manufacturing and Supplying Capacity:

Product: Stainless Steel Pipes and tubes
Grade 347, 347H, 1.4550
Dimension: 1/2” ~ 24” for smls, 6” ~ 104” for EFW pipe
Schedule: SCH10S, SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS
Type: Seamless / Welded
Manufacturing Craft Cold Drawn,Cold Rolled (ERW/EFW for welded)
Pipe End Plain End, Beveled End, Treaded
Delivery Conditions Solution Annealing, Bright Annealing
Category:

Description

Features of 347/347H Stainless Steel Pipe

  • Excellent resistance for high temperature
  • Similar resistance and corrosion protection as Alloy 321
  • Used for heavy welded equipment when annealing is not possible
  • Good oxidation resistance, on par with most other austenitic stainless steels
  • Higher carbon allows for better high temperature creep properties

 

Material Comparision of Stainless Steel 347 of ASTM –EN –JIS -China

China – GB

Japan

USA

KS

EN/DIN

AS

CNS

DIN

Grade

New(GB24511)

JIS

ASTM

UNS

Grade

S34700

06Cr18Ni11Nb

SUS347

347

S34700

STS347

1.4550

347

347

 X6CrNiNb18-10

S34709

07Cr18Ni11Nb

SUS347HTB

347H

S34709

STS347H

 

Application

347H stainless steel pipe is mainly used where corrosion resistance and sustained operations at temperatures between 800°F and 1500°F (427°C ~ 816°C) is of the utmost importance. It is also a superior grade for use on heavy welded objects, which cannot be re-annealed.

  • Chemical production equipment
  • Boiler and heat exchanger
  • Oil and gas refinery piping
  • Radiant superheaters
  • High pressure steam pipes
  • Heavy wall-welded equipment
  • Aircraft exhaust stacks
  • Car manufacturing

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