Nitronic 60 UNS-S21800
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Nitronic 60 is a nitrogen strengthened austenitic stainless steel, with outstanding strength and resistance to wear and galling. It has corrosion resistance better than 304, and pitting resistance better than 316. It is also available in bar as a high strength version, Nitronic 60 HS.
Nitronic 60 is truly an all purpose metal. This fully austenitic alloy was originally designed as a temperature alloy, and subsequently has good high temperature properties for temperatures around 1800ºF. The oxidation resistance of Nitronic 60 is similar to Type 309 S.S., and far superior to Type 304S.S. This grade is best known for its wear and galling resistance.
The additions of Silicon and Manganese have given this alloy a matrix to inhibit wear, galling, and fretting even in the annealed condition. Higher strengths are attainable through cold working the material and is still fully austenitic after severe cold-working. This working does not enhance the anti-galling properties as is normal for carbon steels and some stainless steels. The benefit to the cold or hot work put into the material is added strength and hardness, and the wear resistance does not decrease noticeably. Chromium and Nickel additions give it comparable corrosion to 304 and 316 stainless steels, while having approximately twice the yield strength. The high mechanical strength in annealed parts permits use of reduced cross sections for weight, and cost reductions through the use of thinner stock.
Several data sheets are available on the wear compatibility of this alloy with dissimilar couples, as well as self-mated coupled results.
If your galling problem occurs at less than 1500ºF, then you should think about switching to this alloy. Nitronic 60 has a better cost advantage than any other alloy available. Other materials require an additional amount of heat treating to raise their hardness, where NITRONIC 60 is excellent in the annealed condition. See more information on NITRONIC 60 HS (High Strength) properties on the NITRONIC 60HS page.
Chemical Composition
(ASTM A276, Bars & Shapes)
| Carbon | Manganese | Phosphorus | Sulphur | Silicon | Chromium | Nickel | Nitrogen |
| (max) | (max) | (max) | |||||
| 0.10 | 7.00-9.00 | 0.060 | 0.030 | 3.50-4.50 | 16.00-18.00 | 8.00-9.00 | 0.08-0.18 |
Room Temperature Mechanical Properties
(Bar)
|
Grade
|
Diameter
|
0.2% Proof Stress
|
Tensile Strength
|
Elongation | Reduction of Area | Hardness | |
|
mm
|
MPa
|
MPa
|
%
|
% | (maximum) | ||
| 60 | ASTM A276 (Minimum) | 345 | 655 | 35 | 55 | 241HB | |
| ASTM A276 (Typical) | 415 | 710 | 64 | 74 | 200HB | ||
| 60 HS | Manufacturers Spec | 63.5-127 | 620 | 760 | 20 | 45 | RC20 |
| Minimum | 128-152 | 485 | 760 | 20 | 45 | RC20 | |
| Typical | 640 | 825 | 21 | 27 | - |
Typical Applications
Chain link conveyer belts and other components; chain drives; bolts, nuts and other fasteners; valve stems, seats and trim; fittings for pumps and valves in chemical processing industries; bridge pins; pins, bushings and roller bearings; aerospace applications.
Description
Nitronic 60 stainless steel provides a significantly lower cost solution to wear and galling problems than cobalt bearing and high nickel alloys. It is a high strength austenitic stainless steel strengthened by nitrogen. It differs from more familiar austenitic stainless steels in containing 8% manganese and 4% silicon. The alloy has better uniform corrosion resistance than type 304 in most media. The chloride pitting resistance is superior to type 316, with room temperature yield strength nearly twice that of 304 and 316. In addition Nitronic 60 has excellent high temperature oxidation resistance and good low temperature impact resistance.
Availability
Austral Wright Metals can supply Nitronic 60 as bar, plate, wire, castings and forging stock.
Physical Properties
Annealed
| Property |
At
|
Value |
Unit
|
|
Density
|
24°C | 7,622 | Kg/m3 |
|
Electrical Conductivity
|
24°C | 1.7% | IACS |
|
Electrical Resistivity
|
24°C | 0.982 | Microhm.m |
|
Poisson's Ratio
|
0.298 | ||
|
Modulus of Elasticity (tension)
|
24°C | 180 | GPa |
|
Modulus of Elasticity (torsion)
|
24°C | 57 | GPa |
|
Relative Magnetic Permeability
|
1.003 | ||
|
Cofficient of Expansion
|
24-93°C | 15.8 | x10-6 / °C |
| 24-316°C | 17.3 | x10-6 / °C | |
| 24-538°C | 18.0 | x10-6 / °C |
Corrosion Resistance
The uniform corrosion resistance of Nitronic 60 falls between grades 304 and 316. However, in a wear system, galling or seizure occurs first, then dimensional loss by wear, and finally corrosion. Galling and wear are the first concerns in design. Although the uniform corrosion resistance of Nitronic 60 is not quite as good as 316, it offers better pitting resistance to chlorides, stress corrosion cracking resistance and crevice corrosion resistance than grade 316.
Wear and Calling Properties
| Wear Compatability of Self-Mated Stainless Metals | |||
|
Grade
|
Hardness
|
Weight Loss
|
|
|
Rockwell
|
Mg / 1000 cycles
|
||
|
105 rpm
|
415 rpm
|
||
|
Nitronic 60
|
B95 | 2.79 | 1.58 |
|
Grade 440C
|
C57 | 3.81 | 0.54 |
|
Nitronic 50
|
B99 | 9.95 | 4.60 |
|
Grade 310
|
B72 | 10.40 | 6.49 |
|
Grade 316
|
B91 | 12.50 | 7.32 |
|
Grade 304
|
B99 | 12.77 | 7.59 |
|
Grade 2205
|
B99 | 17.40 | 4.02 |
|
17-4 PH
|
C43 | 52.80 | 12.13 |
|
Grade 303
|
B98 | 386.10 | 50.47 |
| Wear Compatability of Self-Mated Wrought Alloys | |||
|
Grade
|
Hardness
|
Weight Loss
|
|
|
Rockwell
|
Mg / 1000 cycles
|
||
|
105 rpm
|
415 rpm
|
||
|
D2 Tool Steel
|
C61 | 0.46 | 0.34 |
|
Aluminium Bronze (10.5 Al)
|
B87 | 2.21 | 1.52 |
|
Nitronic 60
|
B95 | 2.79 | 1.58 |
|
Si Bronze
|
B93 | 5.57 | 4.18 |
|
Ti-6Al-4V
|
C36 | 7.64 | 4.49 |
|
Inconel 625
|
B96 | 11.34 | 3.49 |
|
H13 Tool Steel
|
C45 | 20.74 | 10.15 |
|
AISI 4130
|
C32 | 257.59 | 262.64 |
Unlubricated Calling Resistance of Stainless Steels
Threshold Galling Stress, MPa
|
Grade
|
Condition
|
Hardness
|
410
|
416
|
430
|
440C
|
303
|
304
|
316
|
17-4 PH
|
Nitronic
|
Nitronic
|
|
HB
|
32
|
60
|
||||||||||
| 410 | HSR* | 352 | 21 | 28 | 21 | 21 | 28 | 14 | 14 | 21 | 317 | + |
| 416 | HSR | 342 | 28 | 90 | 21 | 145 | 62 | 165 | 290 | 14 | 310 | + |
| 430 | Annealed | 159 | 21 | 21 | 14 | 14 | 14 | 14 | 14 | 21 | 55 | 248 |
| 440C | HSR | 560 | 21 | 145 | 14 | 76 | 34 | 21 | 255 | 21 | + | + |
| 303 | Annealed | 153 | 28 | 62 | 14 | 34 | 14 | 14 | 21 | 21 | + | + |
| 304 | Annealed | 140 | 14 | 165 | 14 | 21 | 14 | 14 | 14 | 14 | 207 | + |
| 316 | Annealed | 150 | 14 | 290 | 14 | 255 | 21 | 14 | 14 | 14 | 21 | 262 |
| 17-4 PH | H950 | 415 | 21 | 14 | 21 | 21 | 14 | 14 | 14 | 14 | + | + |
| Nitronic 32 | Annealed | 235 | 317 | 310 | 55 | + | + | 207 | 21 | + | 207 | + |
| Nitronic 60 | Annealed | 205 | + | + | 248 | + | + | + | 262 | + | + | + |
HSR - Hardened & Stress Relieved
+ - did not gall at stresses up to 345 GPa
Dynamic Coefficient of Friction
Tested in water, self mated
|
Test Stress Level, MPa
|
||||||
|
0.8
|
5.6
|
14.0
|
28.0
|
56.0
|
112.0
|
|
| Nitronic 60 | 0.50 | 0.35 | 0.38 | 0.44 | 0.44 | 0.44 |
| Stellite 6B | 0.30 | 0.60 | 0.63 | - | - | - |
| Nitronic 32 | - | - | 0.45 | 0.53 | 0.65 | 0.58 |
Fabrication
Nitronic 60 can be hot forged. After forging the workpiece must be solution annealed.
Machinability
The alloy is difficult to machine, rated at 50% of 304 and 23% of the free cutting carbon steel AISI B1112. Sharp, rigid, carbide tipped tools and well powered machines are recommended, with the use of heavy cuts and slow speeds.
Heat Treatment
Nitronic 60 is fully austenitic and can not be strengthened by heat treatment. Solution annealing is carried out at 1060°C, followed by water quenching
Weldability
Nitronic 60 is readily welded by all conventional processes. Autogenous GTAW welds are sound, with wear characteristics approximating to the base metal. GTAW welds in heavy sections are also sound and weld tensile strength is slightly higher than base metal. Wear properties are near but below base metal. Pure argon is used as shielding gas and AWS A5.9 ER 218 filler metal is used. Pre-heating and post heating are not needed.
ASTM Product Specifications
| Specification | Title |
| A193 |
Alloy Steel and Stainless Steel Bolting Materials for High Temperature Service (Grade B8S)
|
| A194 |
Carbon and Alloy Steel Nuts for Bolts for High Pressure and High Temperature Service (Grade 8S)
|
| A240 |
Heat Resisting Chromium and Chromium-Nickel Stainless Steel Plate, Sheet and Strip for Pressure Vessels
|
| A276 |
Stainless Steel Bars and Shapes
|
| A314 |
Stainless Steel Billets and Bars for Forging
|
| A479 |
Stainless Steel Bars and Shapes for Use in Boilers and Other Pressure Vessels
|
| A351 |
Castings, Austenitic, Austenitic-Ferritic(Duplex), for Pressure Containing Parts (Grade CF10SMnN)
|
| A7430 |
Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application (Grade CF10MnN)
|
The technical advice and recommendations made in this Product Data Sheet should not be relied or acted upon without conducting your own further investigations, including corrosion exposure tests where needed. Please consult current editions of standards for design properties. Austral Wright Metals assumes no liability in connection with the information in this Product Data Sheet. Austral Wright Metals supplies a comprehensive range of stainless steels, copper alloys, nickel alloys and other high performance metals for challenging service conditions. Our engineers and metallurgists will be pleased to provide further data and applications advice.
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