AISI 8640

AISI 8640

Alloy steels contain various types of steels whose compositions are more than the limitations of C, Mo, Cr, Va, Mn, Ni, Si, and B assigned for carbon steels. These steels are more responsive to mechanical and heat treatments than carbon steels.

Chemical Composition


Element Content(%)
Manganese, Mn 0.75-1.00
Nickel, Ni 0.40-0.70
Chromium, Cr 0.40-0.60
Carbon, C 0.38-0.43
Silicon, Si 0.15-0.30
Molybdenum, Mo 0.15-0.25
Sulfur, S 0.04 (max)
Phosphorus, P 0.035 (max)

Mechanical Properties


Properties Metric Imperial
Elastic modulus 190-210 GPa 27557-30458 ksi
Poisson's ratio 0.27-0.30 0.27-0.30

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 8640 Equivalent Grade / Specifications

  • DIN 1.6546
  • UNI 40 NiCrMo 2 KB
  • B.S. Type 7
  • ASTM A322
  • ASTM A331
  • ASTM A506
  • ASTM A519
  • SAE J404
  • SAE J412
  • SAE J770
  • ASTM A29
  • ASTM A752
  • ASTM A829
  • SAE J1397
  • MIL SPEC MIL-S-16974

AISI 8640 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.