Ni 35, Fe 37, Cr 20, Cu 3.5, Mo 2.5 Mn 2.00 C 0.07 Si 1.00 Cu 3.5 S 0.035 P 0.045
High Performance Alloys stocks and
produces this grade in the following forms: Bar, wire, sheet, plate, coil, fasteners and forgings.
Overview
Alloy 20 is a highly alloyed iron-base nickel-chromium-molybdenum stainless steel developed primarily for use in the sulfuric acid related processes.
Besides sulfuric acid related processes, some typical corrosion resistant applications for the alloy include chemical, pharmaceutical, food, plastics,
synthetic fibers, pickling and FGD systems plus many others.
Although normally considered a stainless steel, it has been classified as a nickel base.
Specifications
Form |
Standard |
Metal Type |
UNS N08020 |
Bar |
ASTM B473 |
Wire |
ASTM B471 |
Sheet |
ASTM B463 |
Plate |
ASTM B463 |
Fitting |
ASTM B366 |
Forging |
ASTM B462 |
Weld Wire |
ER320LR |
Weld Electrode |
E320LR |
Chemistry
Chemical Requirements |
|
Ni |
Cr |
Mo |
Mn |
C |
Si |
Fe |
Max |
38.00 |
21.00 |
3.00 |
2.00 |
0.07 |
1.00 |
Bal. |
Min |
32.00 |
19.00 |
2.00 |
|
|
|
|
Tensile Data
Mechanical Property Requirements |
|
Ultimate Tensile, min. |
Yield Strength,min. (0.2% OS) |
Elong. in 2 in. ( 50.8 mm), min.% |
R/A min. |
Hardness |
Cold Finished/Annealed |
Min |
80 KSi |
35 KSi |
30.0 |
50.0 |
|
Max |
|
|
|
|
|
Min |
551 Mpa |
241 MPa |
|
|
|
Max |
|
|
|
|
|
Hot Finished/Annealed |
Min |
80 KSi |
35 KSi |
30.0 |
50.0 |
|
Max |
|
|
|
|
|
Min |
551 MPa |
241 MPa |
|
|
|
Max |
|
|
|
|
|
Machining
MACHINING DATA |
Carbide tools are suggested
for rates better than 50% of Type 304. |
Machining Type |
Suggested starting rates are: |
Single Point turning : |
Roughing - 0.15" depth, 0.015"/rev feed -175 SFM
Finishing - 0.025" depth, 0.007"/rev feed - 200 SFM |
Drilling : |
1/4" Dia hole - 0.004"/rev feed - 60 SFM
1/2" Dia hole - 0.007"/rev feed - 60 SFM
3/4" Dia hole - 0.010"/rev feed - 60 SFM |
Reaming : |
Feed - same as drilling - 100 SFM |
Side and Slot Milling : |
Roughing - 0.25" depth - 0.007"/tooth feed - 125SFM
Finishing - 0.050" depth - 0.009"/tooth feed - 140SFM |
These rates are for carbide tools,
Type C-2 for roughing, drilling and reaming.
Type C-3 for finishing. |
CARPENTER® and 20Cb-3® are registered trademarks of Carpenter Technology.