347 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 .
Gnee 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.
| Typical Chemical Composition % (max values, unless noted) | ||||||||
| Grade | C | Cr | Mn | Ni | P | S | Si | Cb/Ta |
| 347 | 0.08 max | min: 17.0 max: 20.0 | 2.0 max | min: 9.0 max: 13.0 | 0.04 max | 0.30 max | 0.75 max | min:10x C max: 1.0 |
| 347H | min: 0.04 max: 0.10 | min: 17.0 max: 20.0 | 2.0 max | min: 9.0 max: 13.0 | 0.03 max | 0.30 max | 0.75 max | min:10x C max: 1.0 |
347 SS Tubing Features & Applications
347 stainless tubing offers good corrosion resistance to nitric acids and is often used in applications requiring repeated heating in the range of 800 - 1650 F (427-899 C) such as:
Expansion joint tube assemblies
High-temperature gaskets / o-rings,
Aerospace engine parts
Exhaust manifolds
Other high-temperature applications
Chemical production equipment.
Small diameter 347 stainless steel tubing is welded from strip stock, plug drawn in coil form, annealed as needed in order to meet customer temper requirements, and offered in straight lengths or coil form.
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