347 347H Welded Stainless Steel Pipe
Name：347 347H Welded Stainless Steel Pipe
Section Shape:Round
Length；1-12m/Custom
End：PE, Be
Thickness：1mm-45mm
Outer Diameter：1/8 "to 36" (6-914mm)
Transport Package：Wooden Case
Send E-mail:info@gneestainless.com
Tel:+8615824687445
Description
Gnee Steel (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of 347 347h welded stainless steel pipe in China. With abundant experience, we warmly welcome you to wholesale customized 347 347h welded stainless steel pipe from our factory. For price consultation, contact us.
347 347H Welded Stainless Steel Pipe is a high alloy steel, mainly added with elements such as molybdenum and tantalum to improve its high temperature resistance and corrosion resistance. It is often used in applications in high temperature environments such as chemical, petroleum, and aerospace, and is especially suitable for welding structures.
347 stainless steel pipe contains niobium (Nb) + titanium (Ti) stabilizing elements, which effectively inhibits the sensitization of the welding heat affected zone (HAZ), and has better intergranular corrosion resistance than 304/316L.
347H stainless steel seamless pipe is suitable for long-term service above 650°C, such as supercritical power station boilers; 347 high temperature resistant stainless steel pipe is suitable for conventional needs below 650°C.
ASME SA312 347H Pipe
Equivalent Grades of Stainless Steel 347/ 347H Round Pipe
| STANDARD | WERKSTOFF NR. | UNS | JIS | GOST | EN |
| SS 347 | 1.4550 | S34700 | SUS 347 | 08Ch18N12B | X6CrNiNb18-10 |
| SS 347H | 1.4961 | S34709 | SUS 347H | - | X6CrNiNb18-12 |
Chemical Composition of Stainless Steel 347/ 347H Welded Pipe
| Grade | C | Mn | Si | P | S | Cr | Cb | Ni | Fe |
| SS 347 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 - 20.00 | 10xC – 1.10 | 9.00 - 13.00 | 62.74 min |
| SS 347H | 0.04 – 0.10 | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 - 19.00 | 8xC – 1.10 | 9.0 -13.0 | 63.72 min |
Mechanical Properties of Stainless Steel 347/ 347H Pipe
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.0 g/cm3 | 1454 °C (2650 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
347H Steel Pipe for Boiler Supplier
FAQ
Q. How to choose 347 or 347H?
Choose by temperature: 347 is used for ≤650°C, 347H is used for 650-700°C.
Choose by environment: 347H is preferred for highly corrosive or high-pressure scenarios.
Choose by cost: 347 is a more economical choice when the budget is limited.
Q. What certifications are available for 347/347H welded pipes?
Standard certifications: ASTM A312/ASME SA312, ISO 9001, ASME BPVC.
Q. What is the maximum operating pressure of 347H welded pipes?
Normal pressure: Under the ASME B31.3 standard, the maximum allowable stress is 137 MPa (600°C).
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