|
Grade |
C |
Cr |
Ni |
Mn |
P |
S |
Si |
Other |
|
347 |
≤0.08 |
17.00-19.00 |
9.00-13.00 |
≤2.00 |
≤0.035 |
≤0.030 |
≤1.00 |
Nb≥10*C% |
|
347H |
0.04-0.10 |
17.00-19.00 |
9.00-13.00 |
≤2.00 |
≤0.035 |
≤0.030 |
≤1.00 |
Nb≥8*C% |
Chemical Composition
Mechanical Properties
|
Grade |
Yield strength ksi(MPa) |
Tensile Strength ksi(MPa) |
Elongation % |
Hardness Brinell/Vickers |
Hardness Rockwell |
|
347 |
≥30(205) |
≥75(515) |
≥35 |
≤192 HBW/200HV |
≤90HRB |
|
347H |
≥30(205) |
≥75(515) |
≥35 |
≤192 HBW/200HV |
≤90HRB |
Applications
- Boiler tubes and casings
- Oil and gas refinery piping
- Radiant superheaters
- High-pressure steam pipes
- Heat exchanger tubes
- Cabin heaters
- Heavy wall-welded equipment
- Aircraft exhaust stacks and collector rings
- Chemical production equipment
Testing
- EN 10204/3.1B, EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
- Raw Materials Certificate
- 100% Radiography Test Report
- 100% PMI
- Heat Treatment Charts
- Third Party Inspection Report
- Surface roughness and size measurement
- Manufacturer Test Certificate( Impact Testing, Flatten, Spin,Curve, Hardness, Intergranular ,Point corrosions, Grain size, ET,UT, HT...)
- Laboratory Test Certificate from Govt. Approved Lab
- ......
End of Pipe and Tube
- BE : Beveled end
- BBE : Bevel both ends
- BLE : Bevel large end
- BSE : Bevel small end
- TOE / POE = Treaded One End / Plain One End
- TOE / BOE = Treaded One End / Beveled One End
- POE / BOE = Plain One End / Beveled One End
- TBE = Treaded Both Ends
- PBE = Plain Both Ends
Packing
- Ply Wooden Boxes
- PE Fabric Bundles
- Standard seaworthy export packing
- Plastic Bags, or as required
Marking
- Supplier / Manufacturer Name or Custom Logo - on request
- Specification
- Material Grade
- Nominal Size
- Schedule or Wall Thickness
- Method of Manufacturing (Seamless or Welded)
- Heat Number
Marked Pipe Sample: XTD ASTM A312 TP347H SEAMLESS 42.2x 3.56*6000MM HEAT NO. 2023121205A15
Material Summary
Type 347H is a high carbon austenitic chromium stainless steel. Found in applications that demand high temperature resistance, other major design features include:
1. Similar resistance and corrosion protection as 304
2. Used for heavy welded equipment when annealing is not possible.
3. Good oxidation resistance, on par with most other austenitic stainless steels
4. Higher carbon allows for better high temperature creep properties.
The “H” in 347H stands for “high carbon” content. This variety of stainless steel has higher amounts of carbon than standard 347 stainless steel, with increased tensile strength and creep resistance at elevated temperatures. Due to its higher carbon content, this type of stainless steel provides better stress rupture properties than the standard version. It also offers excellent resistance to oxidation in intermittent service up to 1600F and continuous service up to 1700 degrees F.
Both steels are non-magnetic and can be used in applications where magnetism is a concern.
347h is more expensive than 347 due to its higher carbon content.
Applications for both steels include aerospace, chemical processing, oil and gas, and power generation.
