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ASTM B408 Specification

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

Scope

ASTM B408 specification covers UNS N08120, UNS N08800, UNS N08810, UNS N08811, and UNS N08890 in the form of hot-worked and cold-worked rod and bar. Alloy UNS N08800 is normally employed in service temperatures up to and including 1100°F (593°C). Alloys UNS N08120, UNS N08810, UNS N08811, and UNS N08890 are normally employed in service temperatures above 1100°F (593°C) where resistance to creep and rupture is required, and they are annealed to develop controlled grain size for optimum properties in this temperature range.

Related Specifications of ASTM B408

ASTM A479 ASTM A182

ASTM B408 Chemical Composition

Composition Limits, % Element
UNS Ni Cr Fe Mn, max C Cu, max Si S, max Al B Ti B Nb Mo Nb Ta P W S, max N B
UNS N08120 35.0 min 39.0 max 23.0 min 27.0 max remainder 1.5 0.02 min 0.10 max 0.5 1.0 ... 0.03 0.40 max ... 0.20 max ... 0.4 min 0.9 max 2.50 max ... ... ... ... ... 0.040 max 2.50 max 3.0 0.15 min 0.30 max 0.010 max
UNS N08800 30.0 min 35.0 max 19.0 min 23.0 max 39.5 min A 1.5 0.10 max ... 0.75 1 ... 0.015 0.15 min 0.60 max 0.15 min 0.60 max ... ... ... ... ... ... ... ... ... ... ... ... ... ...
UNS N08810 30.0 min 35.0 max 19.0 min 23.0 max 39.5 min A 1.5 0.05 to 0.10 ... 0.75 1 ... 0.015 0.15 min 0.60 max 0.15 min 0.60 max ... ... ... ... ... ... ... ... ... ... ... ... ... ...
UNS N08811 30.0 min 35.0 max 19.0 min 23.0 max 39.5 min A 1.5 0.06 to 0.10 ... 0.75 1.0 ... 0.015 0.15 min 0.60 max 0.15 min 0.60 max ... ... ... ... ... ... ... ... ... ... ... ... ... ...
UNS N08890 40.0 min 45.0 max 23.5 min 28.5 max remainder 1.5 0.06 min 0.14 max 0.75 1.0 min 2.0 max 0.015 0.05 min 0.60 max 0.15 min 0.60 max ... ... 1.0 min 2.0 max 0.2 min 1.0 max 0.10 min 0.60 max ... ... ... ... ... ...
  • A Iron shall be determined arithmetically by difference.
    B Alloy UNS N08811: Al + Ti, 0.85–1.20.

ASTM B408 Mechanical Requirements

UNS Condition Tensile Strength,
min, psi (MPa)		 Yield Strength
(0.2 % offset) min,
psi (MPa)		 Elongation in 2 in. or 50 mm
(or 4D), min, %
UNS N08120 Cold-worked and hot-worked, annealed 000 (621) 000 (276) 30
UNS N08800 Hot worked, as-hot-worked 000 (550) 000 (240) 25A
Cold-worked and hot-worked, annealed 000 (515) 000 (205) 30
UNS N08810 and
UNS N08811		 Cold-worked and hot-worked, annealed 000 (450) 000 (170) 30
UNS N08890 Cold-worked and hot-worked, annealed 000 (520) 000 (205) 35
UNS N08800,
UNS N08810 and
UNS N08811		 Forging quality B B B
  • A For hot-worked as-hot-worked rectangular bar 5⁄16 in. (7.94 mm) and under in thickness the elongation shall be 20 % min.
    B Forging quality is furnished to chemical requirements and surface inspection only. No tensile properties are required.

ASTM B408 Heat Treatment

The final heat treatment of UNS N08120 shall be 2150°F (1177°C) minimum, UNS N08810, 2050°F (1121°C) minimum, UNS N08811, and UNS N08890, 2100°F (1149°C) minimum.

ASTM B408 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