ASTM B425 Specification

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

Scope

ASTM B425 specification covers nickel-iron-chromiummolybdenum-copper alloys (UNS N06845, UNS N08221, UNS N08825, and UNS N08827)3 in the form of hot-finished and cold-drawn rounds, squares, hexagons, and rectangles.

Related Specifications of ASTM B425

ASTM B425 Chemical Composition

UNS Element
Ni Cr FeB Mn C Cu Si S Al Ti Mo W S N Nb B Mg
UNS N06845 44.0-50.0 20.0-25.0 balance 0.5 0.05 2.0-2.4 0.5 0.010 ... ... 5.0-7.0 2.0-5.0 ... ... ... ... ...
UNS N08221 39.0-46.0 20.0-22.0 balance 1.0 0.025 1.5-3.0 0.5 0.03 0.2 0.6-1.0 5.0-6.5 ... ... ... ... ... ...
UNS N08825 38.0-46.0 19.5-23.5 22.0 min 1.0 0.05 1.5-3.0 0.5 0.03 0.2 0.6-1.2 2.5-3.5 ... ... ... ... ... ...
UNS N08827 39.0-43.0 21.0-23.0 balance 0.5-0.9 0.015 1.6-2.3 0.2-0.5 0.005 0.06-0.25 ... 4.5-6.5 ... 0.5 0.03 0.15 0.002-0.004 0.006-0.015
  • A Maximum unless range or minimum is given. Where ellipses (...) appear in this table, there is no requirement and analysis for the element need not be determined or reported.
    B Element shall be determined arithmetically by difference.

ASTM B425 Mechanical Requirements

UNS Condition Tensile Strength min,
ksi (MPa)
Yield Strength 0.2 % offset,
min, ksi (MPa)
Elongation in 2 in. or 50 mm
or 4D , min,%
UNS N06845 All sizes annealed 100 (690) 40 (276) 30
UNS N08221 All sizes annealed 79 (544) 34 (235) 30
UNS N08825 Annealed: 85 (586) 35 (241) 30A
Hot-finished, cold-drawn Forging Quality: B B B
UNS N08827 All sizes annealed 85 (586) 35 (241) 30A
  • A Not applicable to diameters or cross sections under 3⁄32 in. (2.4 mm).
    B Forging quality is furnished to chemical requirements and surface inspection only. No tensile properties are required.

ASTM B425 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