Stainless Steel-Alloy 347/347H
Alloy 347/347H Description
347 Stainless Steel Sheet | Plate
347 stainless steel sheet and plate is a high-alloy austenitic stainless steel known for its excellent corrosion resistance and ability to withstand high temperatures. It also offers good mechanical properties and high creep and stress rupture properties. Due to these features, 347 stainless steel sheets and plates are widely used in industries such as chemical processing, oil and gas, aerospace, and power generation.
Heat Treatment
Annealing
Temperature: 1010°C – 1120°C (1850°F – 2050°F)
Process: Heat to this range and rapidly cool in air or water to relieve stresses, enhance ductility, and improve toughness.
Solution Annealing
Temperature: 1038°C – 1149°C (1900°F – 2100°F)
Process: Heat to dissolve carbides, then rapidly cool to prevent chromium carbide formation and ensure corrosion resistance.
Stress Relieving
Temperature: 200°C – 400°C (392°F – 752°F)
Process: Heat below critical range and cool in still air to reduce residual stresses.
Normalizing, Quenching, and Tempering: Not suitable for 347 stainless steel due to its stable austenitic structure.
Characteristic
Corrosion resistant in acids and chlorides.
Intergranular resistant after high-temperature exposure.
Strong at various temperatures.
Creep resistant under stress and heat.
Stable in high temperatures.
Formable and weldable.
Oxidation resistant up to 1500°F.
Non-magnetic when annealed.
Versatile in forms and finishes.
Corrosion Resistance
Alloy 347 stainless steel plate exhibits good general corrosion resistance that is comparable to 304. It was developed for use in the chromium carbide precipitation range of 800 – 1500°F (427 – 816°C) where un-stabilized alloys such as 304 are subject to intergranular attack. In this temperature range, the overall corrosion resistance of Alloy 347 stainless steel plate is superior to Alloy 321 stainless steel plate. Alloy 347 also performs somewhat better than Alloy 321 in strongly oxidizing environments up to 1500°F (816°C).
The alloy can be used in nitric solutions, most diluted organic acids at moderate temperatures and in pure phosphoric acid at lower temperatures and up to 10% diluted solutions at elevated temperatures. Alloy 347 stainless steel plate resists polythionic acid stress corrosion cracking in hydrocarbon service. It can also be utilized in chloride or fluoride free caustic solutions at moderate temperatures.
Alloy 347 stainless steel plate does not perform well in chloride solutions, even in small concentrations, or in sulfuric acid.
Chemical Composition %
| % | C | Cr | Ni | Mo | Cu | P | Mn | Si | S | N |
|---|---|---|---|---|---|---|---|---|---|---|
| min | 17 | 9 | ||||||||
| max | 0.08 | 19 | 13 | 0.045 | 2.0 | 0.75 | 0.03 |
Mechanical & Physical Properties
| 0.2% Yield Strength | Tensile Strength | Elongation | Modulus of Elasticity | Density | Melting Range |
|---|---|---|---|---|---|
| MPa | MPa | % | GPa | g/cm³ | °C |
| 205 | 515 | 40 | 193 | 7.96 | 1398-1446 |
- COMMON TRADE NAMES
- X6CrNiNb18-10
- SUS 347
- SUS347H
- 06Cr18Ni11Nb
- Type 347
Specification
- Plate:ASTM A240
- Bar:ASTM A276
- Forging:ASTM A182
- Pipe-Seamless:ASTM A312
- Pipe-Welded:ASTM A358
- Flange:ASME B16.5
- Fitting:ASTM A403
APPLICATION
- Chemical Processing
- Food Processing – equipment and storage
- Petroleum Refining – fluid catalytic cracking units, polythionic acid service
- Pharmaceutical Production
- Waste Heat Recovery – recuperators
Welding consumables
- TIG / GTAW：ER347
- SMAW：E347-15/E347-16
- SAW：ER347 Strip
- Flux: F 7A2-EM12K
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What Can We Offering
Available Product Range (in mm)
- Hot-Rolled Steel Plates
- Thickness: Ranging from 3mm to 120mm
- Width: 600mm-2500mmStandard Width: 1000, 1219, 1500, and 2000mm
- Length:1000mm-25000mm
- Cut to Length: 2000 2440, 3000, 3048 and 6000mm
- Surface Finish: NO.1, NO.4, 2B,2D,BA,6K,8K, HL,Embossed
- Cold-Rolled Steel Sheet/Plate
- Thickness: Ranging from 0.2mm to 4mm
- Width: 600mm-2000mm
- Standard Width: 1000, 1219, 1500, and 2000mm
- Length:1000mm-6000mm
- Cut to Length: 2000 2440, 3000, 3048 and 6000mm
- Form: Sheet Or Coil
Available Round Bar Dimensions (in mm)
- Diameter
- General Range: 3mm to 800mm
- Common Range: 25mm to 152mm
- Specialized: Up to 300mm or more for certain applications
- Length
- Standard: 1 to 6 meters
- Custom: Available in custom cut lengths
- Other dimensions
- Forms: Available in various forms including round, square, hex, flat, billet, and ingot
- Finishes: Common finishes include bright, polished, and black
- Tolerance:±0.05 mm (cold-drawn), ±0.4 mm (hot-rolled)
Type Of Flangs (Size/Dimensions)
- Welding Neck, Reducer Flange,Socket Weld Flange
- Dimensions:½” – 48″（DN15-DN1200）
- Pressure Class:150# 300# 600#900#1500#
- Facing Type:RF,FF,RTJ
- Slip-On Flange,Lap Joint Flange,Threaded Flange
- Dimensions:½” NB – 24″ NB（DN15 – DN600）
- Pressure Class: Class 150 to 2500
- Face: Raised face (RF), Ring type joint (RTJ)
- Blind Flange
- Dimensions:½” – 60″（DN15-DN1500）
- Pressure Class:150# 300# 600#900#1500#
Types of Steel Pipes & Tubes
- Seamless Pipe
- OD Φ6 – Φ630 mm, WT 0.5 – 80 mm
- Welded Pipe
- OD Φ15 – Φ3000 mm (up to 3m for spiral)
- Precision Tube
- OD Φ4 – Φ100 mm, WT tolerance ±0.05mm
- Capillary Tube
- OD 0.5 – 6 mm, WT down to 0.1mm
- Coiled Tube
- Up to 100–1000m long, for OD < Φ25mm
Types of Fittings
- Elbow:Butt-Weld┃Socket Weld ┃Threaded
- 90°, 45°, and 180°. Available in Long Radius (LR) and Short Radius (SR) types.
- Nominal Diameter (DN): DN6 – DN1200 (NPS ¼” – 48″)
- Schedule : SCH 5, 10, 20, 30, 40, 80, 160, XXS
- Custom angles (e.g., 30°, 60°), U-bend heat exchanger tubes
- Tee:Equal┃Reducing┃Butt-Weld┃Socket Weld┃Threaded
- Nominal Diameter (DN): DN6 – DN1200 (NPS ¼” – 48″)
- Schedule : SCH 5, 10, 20, 30, 40, 80, 160, XXS<
- Cap:Butt-Weld┃Threaded┃Socket Weld
- Nominal Diameter (DN): DN6 – DN1200 (NPS ¼” – 48″)
- Schedule : SCH 5, 10, 20, 30, 40, 80, 160, XXS
- Custom non-standard sizes, small batch orders
- Weldolet,Sockolet,Threadolet,Latrolet,Nipolet,Lapolet
- Run Pipe: DN25 – DN1200 (NPS 1″ – 48″)
- Outlet Branch: DN6 – DN200 (NPS ¼” – 8″)
- Schedule: SCH 40, 80, 160, XXS (matched to run pipe)
Overall Supply Range of Metal Strip & Foil
Strip & Foil
- Thickness(Thin Strip):0.02 mm – 0.5 mm
- Thickness(Foil):≤ 0.02 mm（20 μm）
- Narrow width: 5–50 mm (for electronic leads)
- Wide width: 50–600 mm (for general coil applications)
- Coil Length:Continuous rolls, each roll 10–3000 meters
- Roll weight: 1–500 kg (depending on material density)
- Finishes:Bright,Matte,Embossed,Coated