Alloy steels comprise different kinds of steels having compositions exceeding the limitations of B, C, Mn, Mo, Ni, Si, Cr, and Va set for carbon steels. They are designated by AISI four-digit numbers. AISI 4320 alloy steel has high toughness and strength. It contains low carbon content to achieve good welding characteristics.
| Element | Content(%) |
|---|---|
| Iron, Fe | 95.855 - 96.98 |
| Nickel, Ni | 1.65 - 2.00 |
| Manganese, Mn | 0.450 - 0.650 |
| Chromium, Cr | 0.400 - 0.600 |
| Molybdenum, Mo | 0.200 - 0.300 |
| Carbon, C | 0.170 - 0.220 |
| Silicon, Si | 0.150 - 0.300 |
| Sulfur, S | 0.0400 |
| Phosphorous, P | 0.0350 |
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 580 MPa | 84100 psi |
| Yield strength | 425 MPa | 61600 psi |
| 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 |
| Elongation at break (in 50 mm) | 29% | 29% |
| Reduction of area | 58% | 58% |
| Hardness, Brinell | 163 | 163 |
| Hardness, Knoop (converted from Brinell hardness) | 184 | 184 |
| Hardness, Rockwell B (converted from Brinell hardness) | 84 | 84 |
| Hardness, Vickers (converted from Brinell hardness) | 170 | 170 |
| Machinability (annealed and cold drawn. Based on 100 machinability for AISI 1212 steel) | 60 | 60 |
| 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 |
ASTM A29 (4320)
ASTM A322 (4320)
ASTM A331 (4320)
ASTM A519 (4320)
ASTM A535 (4320)
ASTM A752 (4320)
SAE J1397 (4320)
SAE J404 (4320)
SAE J412 (4320)
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.