NITRONIC 60 (Alloy 218) (UNS S21800)
Cr 17, Mn 8, Ni 8.5, Si 4, N 0.13, Mo 0.75, C 0.10, Fe Bal., Cu 0.75, S 0.030, P 0.040

High Performance Alloys stocks and produces this grade in the following forms: Bar, wire, sheet, plate, coil, fasteners and forgings. Request quote on this grade. See our on-line catalog for sizes stocked

Overview

Download Brochure 40 pg PDF

Download Bulletin 2 pg PDF

Austenitic Stainless

Nitronic 60 is truly an all purpose metal. This fully austenitic alloy was originally designed as a wear 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.

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. Download above PDF or call for your own booklet!

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.

Characteristics

Corrosion Properties
The corrosion resistance of Armco NITRONIC 60 Stainless Steel falls between that of types 304 and 316. However, experience shows that in a wear system, a galling or siezure failure occurs first, followed by dimensional loss due to wear, and finally corrosion. Galling and wear must be the first concerns of the design engineer. Although the general corrosion resistance of NITRONIC 60 is not quite as good as Type 316, it does offer better chloride pitting resistance, stress corrosion cracking resistance and crevice corrosion resistance than Type 316 in laboratory conditions. Corrosion tests are not normally performed with NITRONIC 60 High Strength.

Corrosion Resistance
Nitronic 60’s uniform corrosion resistance is better than 304 stainless in most environments. The yield strength of Nitronic 60 is nearly twice that of 304 and 316 stainless steels. Chloride pitting resistance is superior to that of type 316 stainless; Nitronic 60 provides excellent high temperature oxidation resistance and low temperature impact.
Applications using Nitronic 60 are valve stems, seats, and trim, fastening systems, screening, pins, bushings and roller bearings, pump shafts and rings. Other uses include wear plates, rails guides, and bridge pins.

 

Wear Resistance
This alloy provides a significant lower cost way to fight wear and galling compared to Nickel or Cobalt based alloys.

Carburization Resistance

Armco NITRONIC 60 stainless retained the best combination of strength and ductility after exposure compared to Types 316L and 309, as shown below.
Alloy	Exposed	UTS	0.2% YS	Elon.	Bend
		(Ksi)	(Ksi)	% in 4XD	1.5T
NITRONIC 60	No	116.0	49.5	74.0	180°
NITRONIC 60	Yes	91.5	58.0	19.0	100°
Type 316L	No	76.0	30.0	74.4	180°
Type 316L	Yes	65.0	36.0	21.3	110°
Type 309	No	99.0	54.0	64.7	180°
Type 309	Yes	85.5	45.5	14.0	75°

Chemistry

Chemical Requirements
	Ni	Cr	Mn	Si	N	Mo	C
Max	9.00	18.00	9.00	4.5	0.018	0.75	0.10
Min	8.00	16.00	7.00	3.5	0.08

Tensile Data

Mechanical Property Requirements under 0.5"
	Ultimate Tensile	Yield Strength (0.2% OS)	Elong. in 4D	R/A	Hardness
Min	105 KSi	55 KSi	35%	55%
Max
Min	724 MPa	379 MPa
Max

 

Mechanical Property Requirements over 0.5"
	Ultimate Tensile	Yield Strength (0.2% OS)	Elong.	R/A	Hardness
Min	95 KSi	50 KSi	35%	55%
Max
Min	655 MPa	345 MPa
Max

 

There are other high strength properties available for sizes of bar, wire, sheet and plate. Inquire with a sales associate at High Performance Alloys for more information. See bulletin, or brochure on the material (above) for a quick overview.

Specifications

UNS S21800
Bar	ASTM A193 ASTM A194 ASTM A276 ASTM A479 AMS 5848
Wire
Sheet	ASTM A240
Plate	ASTM A240
Fitting
Forging	ASTM A182 ASTM A193 ASTM A 194 ASTM A276 ASTM A479 AMS 5848
Weld Wire	A5.9 ER218
Werkstof No

Applications

• Automotive valves - can withstand gas temperatures of upto 1500°F for a minimum of 50,000 miles.
• Fastener galling - capable of frequent assembly and disassembly, allowing more use of the fastener before the threads are torn up, also helps to eliminate corroded or frozen fasteners.
• Pins - Used in roller prosthetics & chains to ensure a better fit of parts (closer tolerance, non-lubricated) and longer lasting.
• Marine shafts - better corrosion than types 304 and 316, with double the yield strength.
• Pin and hanger expansion joints for bridges - better corrosion, galling-resistance, low temperature toughness, & high charpy values at sub-zero temps compared to the A36 and A588 carbon steels commonly used.

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.

Material in this bulletin has been reprinted from Armco Bulletin No S-45, other Armco sources, and HPAlloys data.

NITRONIC ® is a registered trademark of Armco, Inc.