Alloy steels are designated by AISI four-digit numbers. The first two digits represent the main alloying elements, and the last two digits represent the carbon content present in the alloy in hundredth of a percent. They comprise different kinds of steels which exceed the composition limits of Mn, C, Mo, Si, Ni, Va, and B in the carbon steels. They respond more quickly to mechanical and heat treatments than the carbon steels.
| Element | Content(%) |
|---|---|
| Iron, Fe | 97.295 - 98.07 |
| Chromium, Cr | 0.800 - 1.10 |
| Manganese, Mn | 0.700 - 0.900 |
| Carbon, C | 0.280 - 0.330 |
| Silicon, Si | 0.150 - 0.300 |
| Sulfur, S | 0.0400 |
| Phosphorous, P | 0.0350 |
| 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 (annealed) | 170 | 170 |
| Hardness, Brinell (normalized) | 241 | 241 |
| Hardness, Knoop (converted from Brinell hardness) | 191 | 191 |
| Hardness, Rockwell B (converted from Brinell hardness) | 86 | 86 |
| Hardness, Vickers (converted from Brinell hardness) | 178 | 178 |
| Machinability (annealed and cold drawn. Based on 100 machinability for AISI 1212 steel) | 70 | 70 |
| 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 A322
ASTM A331
ASTM A505
ASTM A519
SAE J404
SAE J412
SAE J770
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.