Nitronic 60

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.

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Category: Austenitic Stainless Steel Tag: Nitronic 60

Description
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Description

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
Grade		mm	MPa	MPa	%	%	(maximum)
60	ASTM A276 (Minimum)		345	655	35	55	241HB
60	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.