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Carbon		0.06 max
Chromium		20.5 - 23.5
Iron		Balance
Manganese		4 - 6
Molybdenum		1.5 - 3
Nickel		11.5 - 13.5
Niobium		0.1 - 0.3
Nitrogen		0.2 - 0.4
Phosphorus		0.04 max
Silicon		1 max
Sulphur		0.03 max
Vanadium		0.1 - 0.3

Principal Design Features		This alloy is an austenitic, nitrogen strengthened steel combining corrosion resistance comparable with 316 stainless and greater strength. It is readily fabricated and remains non-magnetic even after severe forming operations. In many areas, it outperforms types 316 and 317 with almost double the yield strength.

Applications		Generally found in applications requiring high strength and corrosion resistance such as fasteners, boat shafting, marine hardware, pumps and valves.

Machinability		Slow speeds, positive feeds and abundant resulphurized lubricant are essential to success in machining this alloy. Speeds and feeds similar to those employed with 316 or 317 stainless are appropriate here. All common machining practices can be used on this material. Chips will be tough and stringy and it is recommended that curlers or breakers are used.

Forming		All common forming techniques can be used with this alloy. Springback will be greater than with standard austenitics and should be taken into consideration when choosing the appropriate forming forces. Process annealing is recommended to remove stresses resulting from this alloys' high work hardening rate. Heat to 1950 F(1065 C) for intermediate anneal.

Welding		Pre-heating is not required with this material and all common welding methods including gas tungsten arc, gas metal arc and submerged arc are acceptable. Filler metal selection should be of similar chemistry for maximum strength and resistance to intergranular attack.

Forging		Heat to 2000 F, soak to equalize, then heat to 2150 and equalize prior to forging.

Annealing		Soak at 1900-2050 F, quench quickly in air or water.

Hardening		Hardening this alloy requires cold working. It will not harden with exposure to thermal treatment.

Physical Data : [top]

Density (lb / cu. in.)	0.28
Specific Heat (Btu/lb/Deg F - [32-212 Deg F])	0.11
Poissons Ratio	0.298
Modulus of Elasticity Tension	29

Form		Plate
Condition		Annealed
Temper		-320
Tensile Strength		226
Yield Strength		127
Elongation		40
Form		Plate
Condition		Annealed
Temper		-100
Tensile Strength		145
Yield Strength		85
Elongation		50
Form		Plate
Condition		Annealed
Temper		70
Tensile Strength		120
Yield Strength		65
Elongation		45
Form		Plate
Condition		Annealed
Temper		600
Tensile Strength		105
Yield Strength		45
Elongation		35
Form		Plate
Condition		Annealed
Temper		800
Tensile Strength		97
Yield Strength		45
Elongation		30
Form		Plate
Condition		Annealed
Temper		1000
Tensile Strength		90
Yield Strength		40
Elongation		41