AISI 4028

AISI 4028

Alloy steels are designated by AISI four-digit numbers. They contain different kinds of steels having compositions which exceed the limitations of Mn, C, Mo, Si, Ni, Va, and B set for carbon steels. They are more responsive to the mechanical and heat treatments.

Chemical Composition


Element Content(%)
Iron, Fe 98.07 - 98.67
Manganese, Mn 0.70 - 0.90
Carbon, C 0.25 - 0.30
Molybdenum, Mo 0.20 - 0.30
Silicon, Si 0.15 - 0.35
Sulfur, S 0.035 - 0.050
Phosphorous, P 0.035

Mechanical Properties


Properties Metric Imperial
Bulk modulus (typical for steel) 140 GPa 20300 ksi
Shear modulus (typical for steel) 80 GPa 11600 ksi
Elastic modulus 190-210 GPa 27557-30458 ksi
Poisson's ratio 0.27-0.30 0.27-0.30
Hardness, Brinell 167 - 212 167 - 212
Hardness, Knoop (converted from Brinell hardness) 212 212
Hardness, Rockwell B (converted from Brinell hardness) 91 91
Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only) 11 11
Hardness, Vickers (converted from Brinell hardness) 199 199
Machinability (annealed and cold drawn. Based on 100 machinability for AISI 1212 steel) 75 75

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 4028 Equivalent Grade / Specifications

  • ASTM A322
  • ASTM A331
  • ASTM A519
  • SAE J404
  • SAE J412
  • SAE J770

AISI 4028 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.