AISI 8645

AISI 8645

Alloy steels consist of alloying elements such as manganese, silicon, nickel, titanium, copper, chromium and aluminum in varying amounts to enhance the properties of steel such as corrosion resistance, hardenability, formability, strength and weldability. AISI 8645 alloy steel is a nickel-chromium-molybdenum steel.

Chemical Composition


Element Content(%)
Iron, Fe 96.595 - 97.72
Manganese, Mn 0.75 - 1
Carbon, C 0.43 - 0.48
Nickel, Ni 0.40 - 0.70
Chromium, Cr 0.40 - 0.60
Silicon, Si 0.15 - 0.30
Molybdenum, Mo 0.15 - 0.25
Sulfur, S ≤0.040
Phosphorous, P ≤0.035

Mechanical Properties


Properties Metric Imperial
Tensile strength 1158 MPa 167953 psi
Yield strength 1034 MPa 149969 psi
Elongation 15% 15%
Bulk modulus 140 GPa 20300 ksi
Shear modulus 80 GPa 11600 ksi
Hardness, Brinell 184 - 235 184 - 235
Hardness, Vickers 220 220
Hardness, Knoop 239 239

Sheets / Plates

Production Route Hot Rolled, Cold Rolled
Material Standard AISI, ASTM, ASME, DIN, BS, EN, ISO, JIS, GOST, SAE, IS & Custom Chemistry
Size Width from 100mm to 3000mm ; Length from 500mm to 12000mm
Thickness 0.1mm to 400mm
Delivery Condition As Rolled, Annealed, Quenched and Tempered, Normalized
Surface Finish Plain, Brushed, Cladded

AISI 8645 Equivalent Grade / Specifications

  • SAE J404
  • SAE J412
  • SAE J770
  • ASTM A322
  • ASTM A331
  • ASTM A505
  • ASTM A519
  • MIL-SPEC MIL-S-16974

AISI 8645 Applications

  1. Structures in Buildings, bridges, railway stations
  2. Fabrication of pipeline components & Industrial equipment
  3. Construction of automotive bodies, warehouses, shipping containers
  4. Commercial appliances, etc.