ASTM B572 Specification

This specification2 covers alloys UNS N06002, UNS N06230, UNS N12160, and UNS R30556* in the form of rod for heat resisting and general-corrosive service. The following products are covered under this specification: Rods 5⁄16 to 3⁄4 in. (7.94 to 19.05 mm) exclusive in diameter, hot or cold finished, solution-annealed, and pickled or mechanically descaled. Rods 3⁄4 to 31⁄2 in. (19.05 to 88.9 mm) inclusive in diameter, hot or cold finished, solution annealed, ground, or turned. The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.

Chemical Composition

Element Composition Limits, %
UNS N06002 UNS N06230 UNS N12160 UNS R30556
Nickel remainderA remainderA
remainderA
19.0-22.5
Iron 17.0-20.0 3.0 max 3.5 max remainderA
Chromium 20.5-23.0 20.0-24.0 26.0 30.0 21.0-23.0
Cobalt 0.5-2.5 5.0 max 27.0-33.0 16.0-21.0
Molybdenum 8.0-10.0 1.0-3.00 1.0 max 2.5-4.0
Tungsten 0.2-1.0 13.0-15.0 1.0 max 2.0-3.5
Carbon 0.05-0.15 0.05-0.15 0.15 max 0.05-0.15
Silicon 1.00 max 0.25-0.75 2.4 3.0 0.20-0.80
Manganese 1.00 max 0.30-1.00 1.5 max 0.50-2.00
Phosphorus 0.04 0.030 max 0.030 max 0.04 max
Sulfur 0.03 0.015 max 0.015 max 0.015 max
Columbium ... ... 1.0 max 0.30 max
Tantalum ... ... ... 0.30-1.25
Aluminum ... 0.50 max ... 0.10-0.50
Zirconium ... ... ... 0.001-0.10
Lanthanum ... 0.005--0.050 ... 0.005-0.10
Nrogen ... ... ... 0.10-0.30
Boron ... 0.015 max ... 0.02 max
Titanium ... ... 0.20-0.80 ...
Note:

A. Chemical Analysis—Test Methods E 1473. For elements not covered by Test Methods E 1473, the referee method shall be as agreed upon between the manufacturer and the purchaser. The composition of the remainder element shall be determined arithmetically by difference.

Mechanical Properties

UNS Tensile Strength, min, ksi (MPA) Yield Strength (0.2 % Offset), min, ksi (MPa) Elongation in 2 in. (50.8mm) or 4DA min, %
N06002 95 (660) 35 (240) 35
N06230B 110 (760) 45 (310) 40
N12160C 90 (620) 35 (240) 40
R30556D 100 (690) 45 (310) 40
Note:

A. D refers to the diameter of the tension specimen.
B. Solution annealed at a temperature between 2200 to 2275°F (1204 to 1246°C) followed by a water quench or rapidly cooled by other means.
C. Solution annealed at 1950°F (1065°C) minimum.
D. Solution annealed at 2100°F (1150°C) minimum.