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ASTM B637

This specification covers hot- and cold-worked precipitation-hardenable nickel alloy rod, bar, forgings, and forging stock for high-temperature service (Table 1). The values stated in inch-pound units are to be regarded as the standard. The values given in brackets are for information only.

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Parameter Description

Chemical Composition

Element

Composition Limits, %

UNS N07252 (Formerly Grade 689)

UNS N07001 (Formerly Grade 685)

UNS N07500 (Formerly Grade 684)

UNS N07750 (Formerly Grade 688)

UNS N07718 (Formerly Grade 718)

UNS N07080 (Formerly Grade 80A)

UNS N07752

UNS N09925

UNS N07725

Carbon

0.10-0.20

0.03-0.10

0.15 max

0.08 max

0.08 max

0.10 max

0.020-0.060

0.03 max

0.03 max

Manganese

0.50 max

1.00 max

0.75 max

1.00 max

0.35 max

1.00 max

1.00 max

1.0 max

0.35 max

Silicon

0.50 max

0.75 max

0.75 max

0.50 max

0.35 max

1.00 max

0.50 max

0.5 max

0.20 max

Phosphorus

0.015 max

0.030 max

0.015 max

...

0.015 max

...

0.008 max

0.03 max

0.015 max

Sulfur

0.015 max

0.030 max

0.015 max

0.01 max

0.015 max

0.015 max

0.003 max

0.03 max

0.010 max

Chromium

18.00-20.00

18.00-21.00

15.00-20.00

14.00-17.00

17.0-21.0

18.00-21.00

14.50-17.00

...

...

Cobalt

9.00-11.00

12.00-15.00

13.00-20.00

1.00 maxA

1.0 maxA

...

0.050 max

...

...

Molybdenum

9.00-10.50

3.50-5.00

3.00-5.00

...

2.80-3.30

...

...

2.5-3.5

7.00-9.50

Columbium (Nb) + tantalum

...

...

..

0.70-1.20

4.75-5.50

...

0.70-1.20

0.5 max (Nb only)

2.75-4.00

Titanium

2.25-2.75

2.75-3.25

2.50-3.25

2.25-2.75

0.65-1.15

1.80-2.70

2.25-2.75

1.9-2.40

1.00-1.70

Aluminum

0.75-1.25

1.20-1.60

2.50-3.25

0.40-1.00

0.20-0.80

0.50-1.80

0.40-1.00

0.1-0.5

0.35 max

Zirconium

...

0.02-0.12

...

...

...

...

0.050 max

...

...

Boron

0.003-0.01

0.003-0.01

0.003-0.01

5.00-9.00

0.006 max

...

0.007 max

...

...

Iron

5.00 max

2.00 max

4.00 max

...

remainderB

3.00 max

5.00–9.00

22.0 min

remainderB

Copper

...

0.50 max

0.15 max

0.50 max

0.30 max

...

0.50 max

1.5–3.0

...

Zirconium

...

...

...

...

...

...

0.050 max

...

...

Nickel

remainderB

remainderB

remainderB

70.00 min

50.0-55.0

remainderB

70.0 min

42.0–46.0

55.0–59.0

Note:

A. If determined.
B. The element shall be determined arithmetically by difference.

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Mechanical Properties

Alloy

Heat Treatment

Tensile Strength, min, psi [MPa]

Yield Strength (0.2 % offset), min, psi [MPa]

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

Reduction of Area, min, %

Brinell Hardness

N07252

solution + precipitation harden

160 000 [1100]

90 000 [620]

20

18

310 min

N07001

solution + stabilize + precipitation harden

160 000 [1100]

110 000 [760]

158

188

310 min

N07500 [rod andbar]

anneal+ solution + stabilize + precipitation harden

175 000 [120]

105 000 [725]

15

15

310 min

N07500 [forgings]

solution + stabilize + precipitation harden

170 000 [1170]

100 000 [690]

20

18

310 min

N07750 Type 1

solution at 2100°F [1149°C] + stabilize + precipitation harden

140 000 [965]

90 000 [620]

8

...

262 min

N07750 Type 2C

solution at 1800°F [982°C] + precipitation harden

170 000 [1170]

115 000 [790]

18

18

302 to 363

N07750 Type 2D

solution at 1800°F [982°C] + precipitation harden

170 000 [1170]

115 000 [790]

15 [10]E

15 [12]E

302 to 363

N07750 Type 3

solution anneal at 2000°F [1093°C] + precipitation harden

160 000 [1103], min 185 000 [1276], max

100 000 [689], min 130 000 [896], max

20

20

267-363, Bm 27-40, Rc

N07752 Type 1

solution anneal at 1975°F [1080°C] + precipitation harden

160 000 [1103], min 185 000 [1276], max

100 000 [689], min 130 000[896], max

20

20

267 to 363, Ba 27 to 40, Rc

N07752 Type 2

solution anneal at 1975°F [1080°C] + precipitation harden

140 000 [965]

85 0000 [585]

20

20

...

N07718

solution + precipitation harden

185 000 [1275]

150 000 [1034]

12 [6]E

15 [8]E

331 min

N07080

solution + stabilize + precipitation harden

135 000 [930]

90 000 [620]

20

...

...

N07725

solution + precipitation harden

150 000 [1034]

120 000 [827]

20

35

43, Rc max

N09925F

solution + precipitation harden

140 000 [965]

105 000 [724]

18

25

38, Rc max

N09925G

solution + precipitation harden

140 000 [965]

110 000 [758]

18

25

38, Rc max

Note:

A. The supplier shall demonstrate that the material will meet fully heat-treated properties after full heat treatment in accordance with Table 2.
B. Forgings.
C. Up to 2.50 in. [63.5 mm], exclusive.
D. 2.50 to 4.00 in. [63.5 to 101.6 mm], exclusive.
E. These values apply for tension specimens machined tangentially from near the center of large disk forgings over 50 in.2 [3225.8 mm2] in cross section or radially from rings 3 in. [76.2 mm] or more in thickness.
F. Cold worked, solution annealed and aged, 0.625 in. [15.9 mm] to 3 in. [76.2 mm], inclusive.
G. Hot worked, solution annealed and aged, 1 in. [25.4 mm] or over.

 

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