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ASTM B446

This specification covers nickel-chromiummolybdenum-columbium (UNS N06625), nickel-chromiummolybdenum-silicon alloy (UNS N06219), and NickelChromium-Molybdenum-Tungsten Alloy (UNS N06650) in the form of hot-worked rod and bar and cold-worked rod in the conditions. UNS N06625 products are furnished in two grades of different heat-treated conditions: Grade 1 (Annealed)—Material is normally employed in service temperatures up to 1100°F (593°C). Grade 2 (Solution Annealed)—Material is normally employed in service temperatures above 1100°F (593°C) when resistance to creep and rupture is required.

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Parameter Description

Chemical Composition

Element

Composition Limits, %

N06625

N06219

N06650

Carbon

0.10 max

0.05 max

0.03 max

Manganese

0.50 max

0.50 max

0.50 max

Silicon

0.50 max

0.70-1.10

0.50 max

Phosphorus

0.015 max

0.020 max

0.020 max

Sulfur

0.015 max

0.010 max

0.010 max

Chromium

20.0 min - 23.0 max

18.0-22 .0

19.0-21.0

Columbium + tantalum

3.15 min - 4.15 max

...

0.05-0.50

Cobalt (if determined)

1.0 max

1.0 max

1.0 max

Molybdenum

8.0 min

7.0-9.0

9.5-12 5

 

10.0 max

...

...

Iron

5.0 max

2.0-4.0

12.0-16.0

Aluminum

0.40 max

0.50 max

0.05-0.50

Titanium

0.40 max

0.50 max

...

Copper

...

0.50 max

0.30 max

NickelA

58.0 min

Bal.

Bal.

Tungsten

...

...

0.50-2.50

Nitrogen

...

...

0.05-0.20

Note:

A. Element shall be determined arithmetically by difference

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Mechanical Properties for Hot-Worked Rod and Bar and ColdWorked Rod A

Diameter or Distance Between Parallel Surfaces, in. (mm)

Tensile Strength min, ksi (MPa)

Yield Strength (0.2 % offset), min, ksi (MPa)

Elongation in 2 in. or 50 mm or 4D, min, %

UNS N06625 Grade 1 (Annealed)B

Up to 4 (102), incl

120

60

30

Over 4 (102) to 10 (254), incl

110

50

25

UNS N06625 Grade 2 (Solution Annealed)C

All sizes

100

40

30

UNS N06219 All (Solution Annealed)

All sizes

96 (600)

39 (270)

50

UNS N06650 All (Solution Annealed)

All sizes

116 (800)

58 (400)

45

Note:

A. Forging quality is furnished to chemical requirements and surface inspection only. No tensile properties are required. Forging stock is typically supplied in the hot worked condition, (see X1.1.5).
B. Annealed 1600°F (871°C) minimum.
C. Solution annealed at 2000°F (1093°C) minimum, with or without subsequent stabilization anneal at 1800°F (982°C) minimum to increase resistance to sensitization.