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Stainless Steel Alloy 20 |
Related Metals: |
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Carpenter 20 CB 3(tm)
Nicrofer 3620 Nb(tm)
Carlson Alloy C20(tm)
AL 20(tm)
Nickelvac 23(tm)
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Specifications: |
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AISI 664
ASTM B366
ASTM B462
ASTM B463
ASTM B464
ASTM B468
ASTM B471
ASTM B473
ASTM B474
ASTM B475
ASTM B729
DIN 2.4660
UNS N08020
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 |
Chemistry Data |
Carbon |
|
0.07 max |
Chromium |
|
19 - 21 |
Copper |
|
3 - 4 |
Iron |
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Balance |
Manganese |
|
2 max |
Molybdenum |
|
2 - 3 |
Nickel |
|
32 - 38 |
Phosphorus |
|
0.045 max |
Silicon |
|
1 max |
Sulphur |
|
0.035 max |
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General Information |
Principal Design Features |
This alloy is a columbium stabilized material that combines excellent corrosion resistance with elevated mechanical properties and relatively easy fabrication. It particularly excels in resisting corrosion to hot sulfuric acids when compared to convention |
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Applications |
Good availability at both the mill and distributor levels have made this a popular choice for a wide variety of applications. Included among these are: equipment for the manufacture of synthetic rubber, plastics, organic and heavy chemicals, pharmaceutica |
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Machinability |
Superior finishes may be obtained using set-up and process speeds and feeds normally employed in austenitic stainless steels such as 316 and 317. Slow speeds and heavy, constant feeds are the rules in working this alloy. |
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Forming |
To obtain maximum ductility, heat material to 2100 F(1149 C). Understand, however, that this process will adversely affect the stability of the material. Without this process, the material can be satisfactorily formed albeit with a high work hardening rat |
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Corrosion Resistance |
This alloy was designed primarily for resistance to attack by sulfuric acid solutions. Its high levels of Chromium, Nickel, Molybdenum and Copper, however, give it excellent resistance to pitting, stress corrosion cracking and intergranular corrosion. The |
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Welding |
Most commonly used welding methods with the exception of oxyacetylene welding have been successfully employed with this alloy. The presence of columbium tends to minimize the precipitation of carbides in the heat affected zone, so the material may, in mos |
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Forging |
Soak thoroughly at 2100-2250 F(1149-1232 C). Re-heat when temperature drops below 1800 F(982 C). After forging, reheat and soak completely at 1725-1850 F(941-1010 C) and quench rapidly in water or oil. |
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Hot Working |
This alloy can be successfully hot formed using forces similar to those required by austenitic stainless steels. |
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Cold Working |
This alloy can be successfully cold formed using all common practices. Its elevated strength may require higher forming pressures. |
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Annealing |
Soak thoroughly at 1725-1850 F(941-1010 C), water quench. |
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Hardening |
This material may only be hardened by cold work. |
|
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Physical Data |
Density (lb / cu. in.) |
|
0.292 |
Specific Gravity |
|
8.055 |
Specific Heat (Btu/lb/Deg F - [32-212 Deg F]) |
|
0.12 |
Electrical Resistivity (microhm-cm (at 68 Deg F)) |
|
651 |
Poissons Ratio |
|
0.31 |
Magnetic Permeability |
|
1.002 |
Modulus of Elasticity Tension |
|
28 |