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.