NAS 600 (UNS N06600), comparable to Inconel^® 600 Alloy

Chemical Composition

JIS G4902 / NCF 600

	C	Si	Mn	P	S	Ni	Cr	Cu	Co	Al	Ti	Fe
Min	―	―	―	―	―	72.00	14.00	―	―	―	―	6.00
Max	0.15	0.50	1.00	0.030	0.015	―	17.00	0.50	―	―	―	10.00

ASTM B168 / UNS N0660

	C	Si	Mn	P	S	Ni	Cr	Cu	Co	Al	Ti	Fe
Min	―	―	―	―	―	72.0	14.00	1.00	―	―	―	6.0
Max	0.15	0.5	1.0	―	0.015	―	17.0	0.5	―	―	―	10.0

EN10095 / 2.4816

	C	Si	Mn	P	S	Ni	Cr	Cu	Co	Al	Ti	Fe
Min	0.05	―	―	―	―	72.00	14.00	―	―	―	―	6.00
Max	0.10	0.50	1.00	0.020	0.015	―	17.00	0.50	1.5	0.30	0.30	10.00

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Physical Properties

Specific heat (J/kg･K)		444
Specific resistivity (μΩ･cm)		103
Thermal conductivity (W/m･K)		15.0
Coefficient of thermal expansion (10-6/℃)	25–93℃	13.3
	25–316℃	14.2
	25–538℃	15.1
	25–760℃	16.0
	25–982℃	16.7
Young's modulus (MPa)		21.4 x 104
Curie point (℃)		-124
Ferromagnetism		None
Melting point (℃)		1371-1427

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Mechanical Properties

Mechanical Properties at Room Temperature

JIS G4902 / NCF 600

0.2% Yield strength (N/mm2)	Tensile strength (N/mm2)	Elongation (%)	Hardness
			(HV)	(HB)
≥ 245	≥ 550	≥ 30	≤ 182	≤ 179

ASTM B168 / UNS N0660

0.2% Yield strength (N/mm2)	Tensile strength (N/mm2)	Elongation (%)	Hardness
			(HV)	(HB)
≥ 240	≥ 550	≥ 30	―	―

EN10095 / 2.4816

0.2% Yield strength (N/mm2)	Tensile strength (N/mm2)	Elongation (%)	Hardness
			(HV)	(HB)
≥ 240	500-850	≥ 30	―	≤ 200

High-Temperature Strength

Properties at High Temperatures

High-Temperature, Brief Pull

Creep Properties

Heat Treatment	Testing temp. (℃)	Creep rupture strength
		10 hr	100 hr	1000 hr
Hot-rolled sheet Solution treatment	732	137	93	64
	871	56	36	25
	982	30	20	13
Cold-rolled sheet Annealing	538	511	345	234
	649	234	158	100
	760	89	58	38
	871	52	33	21

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Corrosion Resistance

The composition of NAS 600 provides resistance protection in a remarkably large number of corrosive environments. The addition of chromium content provides superior corrosion resistance in acidic environments over nickel alone. Furthermore, the high nickel content maintains the corrosion resistance in a reducing state and exhibits superior corrosion resistance to alkaline solutions. Another feature of this product is the high level of resistance against stress corrosion cracking.

Comparison of Alloys in Stress Resistance Cracking Test

Alloy	Main chemical composition (wt %)	45% (154℃)	42% (142℃)	40% (138℃)	38% (134℃)	35% (126℃)	30% (115℃)	25% (110℃)	20% (108℃)
SUS 304	18Cr-8Ni	×	×	×	×	×	×	×	×
SUS 316L	17Cr-12Ni -2Mo	×	×	×	×	×	×	×	○
NAS 64	25Cr-6Ni -3.3Mo-0.16N	×	×	×	×	×	×	○	○
NAS 155N	18Cr-15Ni -4Mo-3Cu -0.15N	×	×	×	×	×	○	○	○
SUS 185N	20Cr-18Ni -6Mo-0.8Cu -0.2N	×	×	×	×	○	○	○	○
NAS 254N	23Cr-25Ni -5.5Mo-0.2N	×	×	×	○	○	○	○	○
NAS 255NM	20Cr-25Ni -6Mo-1Cu -0.2N	×	×	○	○	○	○	○	○
NAS 354N	23Cr-35Ni -7.5Mo-0.2N	×	○	○	○	○	○	○	○
NAS 600	Ni-17Cr	○	○	○	○	○	○	○	○
NAS NW276	Ni-15Cr -16Mo-4W -5Fe	○	○	○	○	○	○	○	○
NAS NW22	Ni-21Cr -13Mo-3W -4Fe	○	○	○	○	○	○	○	○

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Heat Treatment

NAS 600 is not a precipitation hardening alloy. Therefore heat treatment does not lead to hardening over time.
Typical heat treatments are as follows:

• Solution treatment 1050-1150℃ Air or water cooling
• Annealing 800-1050℃ Air or water cooling
• Stress relief annealing 550-760℃ Air or water cooling

Care should be taken at temperatures exceeding 1050℃ as there is a strong tendency for the crystal grains to become coarse.

Workability

Hot working is relatively easy with NAS 600.Although heating between 1150 and 1180℃, hot working between 1000 and 1180℃ and light working as low as 850℃ are possible, the range between 650 and 850℃ should be avoided as cracking may occur.

The cold workability is easier than austenitic stainless steels, similar to Monel^®.

Weldability

Such welding techniques as TIG, MIG and shielded metal arc welding can be used for NAS 600 as with standard austenitic stainless steels.
Edge preparation is desirable. Wide U- and V-shaped grooves should be used. Care should be taken to ensure the welding portion is clean as NAS 600 is sensitive to surface contamination.

Machinability

As a high-nickel alloy, NAS 600 is not as machinable as an austenitic stainless steel.
Although a high-speed steel tool can be used, we recommend the use of cemented carbide tools, and suggest combining a slower feed rate with a greater cutting depth.
The recommended lathe feed speeds are as follows:

• High-speed steel tool: 1050-1350 mm/min
• Cemented carbide tool 3000-5250 mm/min

After machine work, the lubricant should be completely removed before welding or heat treating.

Properties at High Temperatures

Exhibiting particularly strong heat resistance at high temperatures, NAS 600 can be used in air oxidizing as well as other environments continuously for long periods of time.
Because is has excellent resistance to nitrogen, hydrogen and carburization, NAS 600 can be used in heat treatment furnaces. Care is needed with wet chlorine and bromide, however, as they will cause damage.
The maximum temperatures that NAS 600 may be used in different environments are as follows:

• Long-term continuous use in air oxidizing environment: 1100℃
• Reducing environment of H₂ or CO not containing sulfur: 1150℃
• Oxidizing sulfur environment (in air containing sulfurous acid): 815℃
• Reducing environment containing hydrogen sulfide: 535℃
• Hydrogen chloride: 540℃
• Chlorine gas: 510℃

Applications

Atomic power plants, heat exchangers, industrial chemical evaporators, industrial acid and base machinery, heat treatment furnace parts, afterburner parts and other components used in high temperatures.