Placa de Acero Inoxidable
La Aleaci車n 347 (S34700) es un acero inoxidable estabilizado que ofrece, como su principal ventaja, una excelente resistencia a la corrosi車n intergranular subsecuente a la exposici車n en el rango de precipitaci車n de carburo de cromo de 800 a 1500? F (427 a 816? C). La Aleaci車n 347 se estabiliza agreg芍ndole colombio y tantalio.
Available thicknesses for Alloy 347/347H:
3/16" | 1/4" | 5/16" | 3/8" | 1/2" | 5/8" | 3/4" | 7/8" | 1" | 1 1/8" |
---|---|---|---|---|---|---|---|---|---|
4.8mm | 6.3mm | 7.9mm | 9.5mm | 12.7mm | 15.9mm | 19mm | 22.2mm | 25.4mm | 28.6mm |
1 1/4" | 1 1/2" | 1 3/4" | 2" | 2 1/4" | 2 1/2" | 2 3/4" | 3" | 3 1/2" | 4" |
31.8mm | 38.1mm | 44.5mm | 50.8mm | 57.2mm | 63.5mm | 69.9mm | 76.2mm | 88.9mm | 101.6mm |
El acero inoxidable de Aleaci車n 347 tambi谷n ofrece ventajas para servicio a altas temperaturas debido a sus buenas propiedades mec芍nicas. El acero inoxidable Aleaci車n 347 ofrece propiedades superiores de resistencia a la fractura bajo tensi車n (creep) y resistencia a la ruptura que la Aleaci車n 304 y, particularmente, que la Aleaci車n 304L, por lo cual tambi谷n puede considerarse para exposiciones donde la sensibilizaci車n y la corrosi車n intergranular son de inter谷s.
Est芍 disponible una versi車n alta en carbono, la Aleaci車n 347H. Este grado tiene una designaci車n UNS S34709.
Specification Sheet Overview
for Alloy 347/347H (UNS S34700, S34709):
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General Properties
Alloy 347 (UNS S34700) is columbium stabilized austenitic stainless steel plate with good general corrosion resistance and somewhat better resistance in strong oxidizing conditions than 321 (UNS S32100). It has excellent resistance to intergranular corrosion after exposure to temperatures in the chromium carbide precipitation range of 800 每 1500∼F (427 每 816∼C). The alloy has good oxidation resistance and creep strength to 1500∼F (816∼C). It also possesses good low temperature toughness.
Alloy 347H (UNS S3409) stainless steel plate is the higher carbon (0.04 每 0.10) version of the alloy. It was developed for enhanced creep resistance and for higher strength at temperatures above 1000∼F (537∼C). In most instances, the carbon content of the plate enables dual certification.
Alloy 347 stainless steel plate cannot be hardened by heat treatment, only by cold working. It can be easily welded and processed by standard shop fabrication practices.
Applications
- Chemical Processing
- Food Processing 每 equipment and storage
- Petroleum Refining 每 fluid catalytic cracking units, polythionic acid service
- Pharmaceutical Production
- Waste Heat Recovery 每 recuperators
Standards
ASTM........A 240ASME........SA 240
AMS..........5512
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 每 1500∼F (427 每 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 Analysis
Weight % (all values are maximum unless a range is otherwise indicated)
Element | 347 | 347H |
---|---|---|
Chromium | 17.00 min.-19.00 max. | 17.00 min.-19.00 max. |
Nickel | 9.00 min.-13.00 max. | 9.00 min.-13.00 max. |
Carbon | 0.08 | 0.04 min.-0.10 max. |
Manganese | 2.00 | 2.00 |
Phosphorus | 0.045 | 0.045 |
Sulfur | 0.03 | 0.03 |
Silicon | 0.75 | 0.75 |
Columbium & Tantalum | 10 x (C + N) min.-1.00 max. | 8 x (C + N) min.-1.00 max. |
Iron | Balance | Balance |
Physical Properties
Density
0.288 lbs/in37.96 g/cm3
Specific Heat
0.12 BTU/lb-∼F (32 每 212∼F)500 J/kg-∼K (0 每 100∼C)
Modulus of Elasticity
28.0 x 106 psi193 GPa
Thermal Conductivity 200∼F (100∼C)
133 BTU/hr/ft2/款喧/∼幛16.3 W/m-∼K
Melting Range
2550 每 2635∼F1398 每 1446∼C
Electrical Resistivity
72 Microhm-cm at 20∼FTemperature Range | |||
---|---|---|---|
°F | °C | in/in °F | cm/cm °C |
68-212 | 20-100 | 9.2 x 10-6 | 16.0 x 10-6 |
68-1112 | 20-600 | 10.5 x 10-6 | 18.9 x 10-6 |
68-1832 | 20-1000 | 11.4 x 10-6 | 20.5 x 10-6 |
Mechanical Properties
Typical Values at 68∼F (20∼C)
Yield Strength 0.2% Offset |
Ultimate Tensile Strength |
Elongation in 2 in. |
Hardness | ||
---|---|---|---|---|---|
psi (min.) | (MPa) | psi (min.) | (MPa) | % (min.) | (max.) |
30,000 | 205 | 75,000 | 515 | 40 | 201 Brinell |
Fabrication Data
Alloy 347 stainless steel plate can be easily welded and processed by standard shop fabrication practices.
Cold Forming
The alloy is quite ductile and forms easily.
Hot Forming
The high sulfur content of Alloy 303 also has a detrimental impact on hot workability. If hot forming is required, once again, 304 should be considered as an alternate selection.
Machining
The cold work hardening rate of 347 stainless steel plate makes it less machinable than 410 stainless steel, but similar to 304. The table below provides relevant machining data.
Operation | Tool | Lubrication | CONDITIONS | |||||
---|---|---|---|---|---|---|---|---|
Depth-mm | Depth-in | Feed-mm/t | Feed-in/t | Speed-m/min | Speed-ft/min | |||
Turning | High Speed Steel | Cutting Oil | 6 | .23 | 0.5 | .019 | 12-16 | 39-52 |
Turning | High Speed Steel | Cutting Oil | 3 | .11 | 0.4 | .016 | 18-23 | 59-75 |
Turning | High Speed Steel | Cutting Oil | 1 | .04 | 0.2 | .008 | 23-28 | 75-92 |
Turning | Carbide | Dry or Cutting Oil | 6 | .23 | 0.5 | .019 | 67-76 | 220-249 |
Turning | Carbide | Dry or Cutting Oil | 3 | .11 | 0.4 | .016 | 81-90 | 266-295 |
Turning | Carbide | Dry or Cutting Oil | 1 | .04 | 0.2 | .008 | 99-108 | 325-354 |
Depth of cut-mm | Depth of cut-in | Feed-mm/t | Feed-in/t | Speed-m/min | Speed-ft/min | |||
Cutting | High Speed Steel | Cutting Oil | 1.5 | .06 | 0.03-0.05 | .0012-.0020 | 16-21 | 52-69 |
Cutting | High Speed Steel | Cutting Oil | 3 | .11 | 0.04-0.06 | .0016-.0024 | 17-22 | 56-72 |
Cutting | High Speed Steel | Cutting Oil | 6 | .23 | 0.05-0.07 | .0020-.0027 | 18-23 | 59-75 |
Drill ø mm | Drill ø in | Feed-mm/t | Feed-in/t | Speed-m/min | Speed-ft/min | |||
Drilling | High Speed Steel | Cutting Oil | 1.5 | .06 | 0.02-0.03 | .0007-.0012 | 9-13 | 29-42 |
Drilling | High Speed Steel | Cutting Oil | 3 | .11 | 0.05-0.06 | .0020-.0024 | 11-15 | 36-49 |
Drilling | High Speed Steel | Cutting Oil | 6 | .23 | 0.08-0.09 | .0031-.0035 | 11-15 | 36-49 |
Drilling | High Speed Steel | Cutting Oil | 12 | .48 | 0.09-0.10 | .0035-.0039 | 11-15 | 36-49 |
Feed-mm/t | Feed-in/t | Speed-m/min | Speed-ft/min | |||||
Milling Profiling | High Speed Steel | Cutting Oil | 0.05-0.10 | .002-.004 | 11-21 | 36-69 |
Welding
Alloy 347 stainless steel plate can be readily welded by most standard processes. A post weld heat treatment is not necessary.
NOTE: The information and data in this product data sheet are accurate to the best of our knowledge and belief, but are intended for informational purposes only, and may be revised at any time without notice. Applications suggested for the materials are described only to help readers make their own evaluations and decisions, and are neither guarantees nor to be construed as express or implied warranties of suitability for these or other applications.