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 .
Kaysuns provide dual grade of 347/347H stainless steel pipe and fittings with the exellent quality and fast delivery. Our stainless steel piping can be inspected by third party inspection, classication of DNV-GL, BV, Llyods, TUV, ABS, KR etc. are available for welded pipes.
Stabilization Heat Treatment of Grade 347H
Stabilization heat treatment is common requirement for heat resistance alloy, such as 321H, 347H etc. Stabilization heat treated is available for our 347H stainless steel pipe and tubes based on the client’s requirement. A heat treatment report will be submitted if necessary, Kaysuns always provide the quality products for the engineerings.
Stainless Steel 347H Tubings Chemical Composition to ASTM A312, ASTM A269, ASTM A213
Grade | C | Mn | P | S | Si | Ni | Cr | Nb | Weight % |
347 |
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| 9.00 | 17.00 | 10C | Min. |
0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 13.00 | 19.00 | 1.00 | Max. | |
347H | 0.04 |
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| 11.00 | 18.00 | 8C | Min. |
0.10 | 2.00 | 0.045 | 0.03 | 1.00 | 15.00 | 20.00 | 1.00 | Max. |
347H Stainless Steel Pipe Mechanical Properties ASTM A312, ASTM A269, ASTM A213
Grade | Tensile Strength, Min. Mpa | Yield Strength, Min. Mpa | Longitudinal |
347 | 515 | 205 | 35 |
347H | 515 | 205 | 35 |
Available Manfaucturing Standard for 347/347H Stainless Steel Pipe
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 |
| Manfaucturing Craft | Cold Drawn,Cold Rolled (ERW/EFW for welded) |
| Pipe End | Plain End, Beveled End, Treaded |
| Delivery Condtions | Solution Annealing, Bright Annealing |
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 |
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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
