Stainless Steel Nitronic 60 UNS S21800

 Product Data Sheet – Stainless Steel

Nitronic 60  UNS-S21800

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.

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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