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ASTM B637 Specification

Forgings, Fasteners, Boltings, Stud Bolts, Screws, Nuts

ASTM B637 specification covers hot and cold-worked precipitation hardenable nickel alloy rod, bar, forgings, and forging stock for moderate or high temperature service. ASTM B637 includes some of the most popular trade names like inconel, waspaloy, nimonic and incoloy. We at Torqbolt are dedicated to provide Stud Bolts, Screws, Nuts, Washers & Bolting in accordance with ASTM B637.

Related Specifications of ASTM B637

A1014 B805 EN 10269 DIN 267

ASTM B637 Chemical Composition

Composition Limits, % Element
UNS C Mn Si P S Cr Co Mo Nb + Ta Ti Al Zr B Fe Cu Ni Ta Nb W V
UNS N07022 0.010 max 0.5 max 0.08 max 0.025 max 0.015 max 20.0-21.4 1.0 max 15.5-17.4 ... ... 0.5 max ... 0.006 max 1.8 max 0.5 max remainderB 0.2 max ... 0.8 max ...
UNS N07208 0.04-0.08 0.3 max 0.15 max 0.015 max 0.015 max 18.5-20.5 9.0-11.0 8.0-9.0 ... 1.90-2.30 1.38-1.65 0.020 max 0.003-0.010 1.5 max 0.1 max remainderB 0.1 max 0.2 max 0.5 max ...
UNS N07252 (Formerly Grade 689) 0.10-0.20 0.50 max 0.50 max 0.015 max 0.015 max 18.00-20.00 9.00-11.00 9.00-10.50 ... 2.25-2.75 0.75-1.25 ... 0.003-0.01 5.00 max ... remainderB ... ... ... ...
UNS N07001 (Formerly Grade 685) 0.03-0.10 1.00 max 0.75 max 0.030 max 0.030 max 18.00-21.00 12.00-15.00 3.50-5.00 ... 2.75-3.25 1.20-1.60 0.02-0.12 0.003-0.01 2.00 max 0.50 max remainderB ... ... ... ...
UNS N07500 (Formerly Grade 684) 0.15 max 0.75 max 0.75 max 0.015 max 0.015 max 15.00-20.00 13.00-20.00 3.00-5.00 ... 2.50-3.25 2.50-3.25 ... 0.003-0.01 4.00 max 0.15 max remainderB ... ... ... ...
UNS N07740 0.005-0.08 1.00 max 1.00 max 0.030 max 0.030 max 23.50-25.50 15.00-22.00 2.00 max ... 0.50-2.50 0.20-2.00 ... 0.0008-0.006 3.00 max 0.50 max remainderB ... 0.50-2.50 ... ...
UNS N07750 (Formerly Grade 688) 0.08 max 1.00 max 0.50 max ... 0.01 max 14.00-17.00 1.00 maxA ... 0.70-1.20 2.25-2.75 0.40-1.00 ... ... 5.00-9.00 0.50 max 70.00 min ... ... ... ...
UNS N07718 (Formerly Grade 718) 0.08 max 0.35 max 0.35 max 0.015 max 0.015 max 17.0-21.0 1.0 maxA 2.80-3.30 4.75-5.50 0.65-1.15 0.20-0.80 ... 0.006 max remainderB 0.30 max 50.0-55.0 ... ... ... ...
UNS N07080 (Formerly Grade 80A) 0.10 max 1.00 max 1.00 max ... 0.015 max 18.00-21.00 ... ... ... 1.80-2.70 0.50-1.80 ... ... 3.00 max ... remainderB ... ... ... ...
UNS N07752 0.020-0.060 1.00 max 0.50 max 0.008 max 0.003 max 14.50-17.00 0.050 max ... 0.70-1.20 2.25-2.75 0.40-1.00 0.050 max 0.007 max 5.00-9.00 0.50 max 70.0 min ... ... ... 0.10 max
UNS N09925 0.03 max 1.0 max 0.5 max 0.03 max 0.03 max 19.5-22.5 ... 2.5-3.5 0.5 max (Nb only) 1.9-2.40 0.1-0.5 ... ... 22.0 min 1.5-3.0 42.0-46.0 ... ... ... ...
UNS N07725 0.03 max 0.35 max 0.20 max 0.015 max 0.010 max 19.00-22.50 ... 7.00-9.50 2.75-4.00 1.00-1.70 0.35 max ... ... remainderB ... 55.0-59.0 ... ... ... ...
  • A If determined.
    B The element shall be determined arithmetically by difference.

ASTM B637 Mechanical Requirements

Tensile and Hardness Requirements

UNS 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 or
(Rockwell C)
Hardness
ASTM B637 UNS N07022 Type 1A solution + cold worked 160 000 (1103) 150 000 (1034) 17 50 382 max (42 Rc max)
ASTM B637 UNS N07022 Type 1B solution + cold worked 185 000 (1276) 180 000 (1240) 13 30 425 max (46 Rc max)
ASTM B637 UNS N07022 Type 2 solution + cold worked + precipitation harden 178 000 (1227) 160 000 (1103) 15 24 479 max (50 Rc max)
ASTM B637 UNS N07022 Type 3 solution + precipitation harden 145 000 (1000) 80 000 (552) 15 14 228 min (20 Rc min)
ASTM B637 UNS N07208 solution + precipitation harden 150 000 (1034) 90 000 (620) 20 14 250 min (24 Rc min)
ASTM B637 UNS N07252 solution + precipitation harden 160 000 (1100) 90 000 (620) 20 18 310 min 34 Rc min)
ASTM B637 UNS N07001 solution + stabilize + precipitation harden 160 000 (1100) 110 000 (760) 15B 18B 310 min (34 Rc min)
ASTM B637 UNS N07500 (rod and bar) anneal + solution + stabilize + precipitation harden 175 000 (120) 105 000 (725) 15 15 310 min (34 Rc min)
ASTM B637 UNS N07740 solution + precipitation harden 150 000 (1035) 90 000 (620) 20 18 ...
ASTM B637 UNS N07500 (forgings) solution + stabilize + precipitation harden 170 000 (1170) 100 000 (690) 20 18 310 min (34 Rc min)
ASTM B637 UNS N07750 Type 1 solution at 2100°F (1149°C) + stabilize + precipitation harden 140 000 (965) 90 000 (620) 8 ... 262 min (26 Rc min)
ASTM B637 UNS N07750 Type 2C solution at 1800°F (982°C) + precipitation harden 170 000 (1170) 115 000 (790) 18 18 302 to 363 (32-40 Rc)
ASTM B637 UNS 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 (32-40 Rc)
ASTM B637 UNS 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 to 363, Bm (27-40, Rc)
ASTM B637 UNS 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
(27-40, Rc)
ASTM B637 UNS N07752 Type 2 solution anneal at 1975°F (1080°C) + precipitation harden 140 000 (965) 85 0000 (585) 20 20 ...
ASTM B637 UNS N07718 solution + precipitation harden 185 000 (1275) 150 000 (1034) 12 (6)E 15 (8)E 331 min (36 Rc min)
ASTM B637 UNS N07080 solution + stabilize + precipitation harden 135 000 (930) 90 000 (620) 20 ... ...
ASTM B637 UNS N07725 solution + precipitation harden 150 000 (1034) 120 000 (827) 20 35 393 max (43, Rc max)
ASTM B637 UNS N09925F solution + precipitation harden 140 000 (965) 105 000 (724) 18 25 346 max (38, Rc max)
ASTM B637 UNS N09925G solution + precipitation harden 140 000 (965) 110 000 (758) 18 25 346 max (38, Rc max)
  • A The supplier shall demonstrate that the material will meet fully heat-treated properties after full heat treatment in accordance with Heat Treatment
    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.

Stress Rupture Requirements

UNS Heat Treatment Test Temperature,
°F (°C)		 Stress, psi (MPa)B Minimum Hours Elongation in 2 in.
or 50 mm (or 4D),
min, %
ASTM B637 UNS N07208 solution + precipitation harden 1700 (927) 13 000 (89) 50 10
ASTM B637 UNS N07252 solution + precipitation harden 1500 (816) 30 000 (205) 100 10
ASTM B637 UNS N07001 solution + stabilize + precipitation harden 1500 (816) 33 000 (230) 100 5
ASTM B637 UNS N07500 (rod and bar) anneal + solution + stabilize + precipitation harden 1500 (816) 38 000 (260) 100 5
ASTM B637 UNS N07740A solution + precipitation harden 1472 (800) 41 700 (288) 23 5
ASTM B637 UNS N07500 (forgings) solution + stabilize + precipitation harden 1500 (816) 38 000 (260) 100 5
ASTM B637 UNS N07750 Type 1 solution at 2100°F (1149°C) + stabilize + precipitation harden 1350 (732) 45 000 (310) 100 5 (3 if hours exceed 136)
ASTM B637 UNS N07718 solution + precipitation harden 1200 (649) 100 000 (690) 23 5
ASTM B637 UNS N07080 solution + stabilize + precipitation harden 1400 760 47 000 (325) 23 3.5
ASTM B637 UNS N09925A solution + precipitation harden ... ... ... ...
ASTM B637 UNS N07725A solution + precipitation harden ... ... ... ...

ASTM B637 Heat Treatment

UNS Recommended Annealing Treatment Recommended Solution Treatment Recommended Stabilizing Treatment Precipitation Hardening Treatment
ASTM B637 UNS N07022B Type 1A or 1B ... 1800 to 2100°F (982 to 1149°C), hold 1⁄2 h/in., 5 minutes minimum, rapid air cool or water quench ... ...
ASTM B637 UNS N07022C Type 2 ... 1800 to 2100°F (982 to 1149°C),hold 1⁄2 h/in., 5 minutes minimum, rapid air cool or water quench ... 1125 ± 25°F (605 ± 14°C), hold 10 h, air coolB
ASTM B637 UNS N07022 Type 3 ... 1800 to 2100°F (982 to 1149°C), hold 1⁄2 h/in., 5 minutes minimum, rapid air cool or water quench ... 1300 ± 25°F (705 ± 14°C), hold 16 h, furnace cool to 1125 ± 25°F (605 ± 14°C), hold 32 h, air cool
ASTM B637 UNS N07208 ... 2000 to 2125°F (1093 to 1163°C), hold 1⁄2 h/in., 5 to 10 minutes minimum, water quench or rapid air cool ... 1850 ± 25°F (1010 ±14°C), hold 2 h, air cool, followed by 1450 ± 25°F (788 ± 14°C), hold 8 h, air cool
ASTM B637 UNS N07252 ... 1950 ± 25°F (1066 ± 14°C), hold 4 h, air cool ... 1400 ± 25°F (760 ± 14°C), hold 15 h, air cool or furnace cool
ASTM B637 UNS N07001 ... 1825 to 1900°F (996 to 1038°C), hold 4 h, oil or water quench 1550 ± 25°F (843 ± 14°C), hold 4 h, air cool 1400 ± 25°F (760 ± 14°C), hold 16 h, air cool or furnace cool
ASTM B637 UNS N07500 2150 ± 25°F (1177 ± 14°C), hold 2 h, air cool (bars only) 1975 ± 25°F (1080 ± 14°C), hold 4 h, air cool 1550 ± 25°F (843 ± 14°C), hold 24 h, air cool 1400 ± 25°F (760 ± 14°C), hold 16 h, air cool or furnace cool
ASTM B637 UNS N07740 ... 2010°F (1100°C) minimum, hold 1 h per in. of thickness with 1⁄2 h minimim hold, water quench or rapid air cool ... 1400 to 1500°F (760 to 815°C), hold 4 h minimum for up to 2 in. thickness + additional 1⁄2 h per each additional in. of thickness, air cool
ASTM B637 UNS N07750 Type 1 (Service above 1100°F) (593°C) ... 2100 ± 25°F (1149 ± 14°C), hold 2 to 4 h, air cool 1550 ± 25°F (843 ± 14°C), hold 24 h, air cool 1300 ± 25°F (704 ± 14°C), hold 20 h, air cool or furnace cool
ASTM B637 UNS N07750 Type 2 (Service up to 1100°F) (593°C) ... 1800 ± 25°F (982 ± 14°C), hold 1⁄2 h min, cool at rate equivalent to air cool or faster ... 1350 ± 25°F (732 ± 14°C), hold 8 h, furnace cool to 1150 ± 25°F (62 1 ± 14°C), hold until total precipitation heat treatment has   reached 18 h, air cool
ASTM B637 UNS N07750 Type 3 ... 1975 - 2050°F (1079 - 1121°C), hold 1 to 2 h, air cool ... 1300 ± 25°F (704 ± 14°C), hold 20 h, + 4 - 0 h, air cool
ASTM B637 UNS N07752 Type 1 ... 1975 ± 25°F (1080 ± 14°C), hold 1 to 2 h, cool by water or oil quenching ... 1320 ± 25°F (715 ± 14°C), hold 20 h, +2, -0 h, air cool
ASTM B637 UNS N07752 Type 2 ... 1975 ± 25°F (1080 ± 14°C), hold 1 to 2 h, cool by water or oil quenching ... 1400 ± 25°F (760 ± 14°C), hold 100 h, +4, -0 h, air cool
ASTM B637 UNS N07718 ... 1700 to 1850°F (924 to 1010°C), hold 1⁄2 h min, cool at rate equivalent to air cool or faster ... 1325 ± 25°F (718 ± 14°C), hold at temperature for 8 h, furnace cool to 1150   ± 25°F (621 ± 14°C), hold until total precipitation heat treatment time has reached 18 h, air cool
ASTM B637 UNS N07080 ... 1950 ± 25°F (1066 ± 14°C), hold 8 h, air cool 1560 ± 25°F (849 ± 14°C), hold 24 h, air cool 1290 ± 25°F (699 ± 14°C), hold 16 h, air cool
ASTM B637 UNS N07725 ... 1900 ± 25°F (1038 ± 14°C), hold 1⁄2 min, and 4 h max, cool at rate equivalent to air cool ... 1350 ± 25°F (732 ± 14°C), hold at temperature for 5 to 81⁄2 h, furnace cool to 1150 ± 25°F (621 ± 14°C), hold at temperature for 5 to 8 1⁄2 h, air cool or faster
ASTM B637 UNS N09925 ... 1825 to 1875°F (996 to 1024°C),   hold 1⁄2 min, and 4 h max,   cool at rate equivalent to air cool or faster ... 1365 ± 25°F (740 ± 14°C), hold at temperature for 6 to 9 hr, furnace cool to 1150 ± 25°F (621 ± 14°C), hold until total precipitation heat treatment time has reached 18 h, air cool or faster
  • A The purchaser shall designate on the purchase order or inquiry any partial stage of heat treatment required on material to be shipped.
    B For solution treated + cold worked material only, when specified.
    C For solution treated + cold worked + precipitation hardened material only, when specified

ASTM B637 Certifications

  • EN 10204 3.1
  • EN 10204 3.2
  • PED 2014/68/EC
  • MERKBLATT AD 2000 W2/W7/W10
  • API 20 E BSL 1/ BSL 2
  • NACE MR 0175
  • NACE MR 0103