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- API 5CT N80 casing and tubing pipe
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Austenitic 347(S34700) stainless steel Corrosion resistance
is variant of the basic austenitic 18/8 Grade 304 with added Columbium - the introduction of Columbium stabilizes the steel and eliminates carbide precipitation which subsequently causes intergranular corrosion.
Chemical Composition
|
UNS No |
Grade |
C |
Si |
Mn |
P |
S |
Cr |
Mo |
Ni |
N |
Other |
|
S34700 |
347 |
0.08 |
0.75 |
2.00 |
0.045 |
0.030 |
17.00/19.00 |
– |
9.00/13.00 |
– |
Cb:10xC1.00 |
Mechanical Properties
|
UNS No |
Grade |
Proof Stress |
Tensile Strength |
Elongation |
Hardness Max |
|
|
HB |
HRB |
|||||
|
S34700 |
347 |
205 |
515 |
40 |
201 |
92 |
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.
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Address : Room 301,Unit 6,lane 2500,xiupu Road,Kangqiao Industrial Area,Pudong New District,Shanghai