Alloy steels are designated by AISI four-digit numbers. They quickly respond to mechanical and heat treatments than the carbon steels. They comprise different kinds of steels having composition which exceed the limitations of B, C, Mn, Mo, Ni, Si, Cr, and Va in the carbon steels.
| Element | Content(%) |
|---|---|
| Iron, Fe | 97.445 - 98.17 |
| Chromium, Cr | 0.750 - 1.00 |
| Manganese, Mn | 0.600 - 0.800 |
| Carbon, C | 0.330 - 0.380 |
| 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 and cold drawn) | 179 - 217 | 179 - 217 |
| Hardness, Knoop (converted from Brinell hardness) | 220 | 220 |
| Hardness, Rockwell B (converted from Brinell hardness) | 92 | 92 |
| Hardness, Rockwell C | 13 | 13 |
| Hardness, Vickers (converted from Brinell hardness) | 208 | 208 |
| 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 |
AFNOR 38 C 4
DIN 1.7034
UNI 38 Cr 4 KB
JIS SCr 3 H
B.S. 530 A 36
SAE J770
B.S. 530 H 36
B.S. Type 3
ASTM A322
ASTM A331
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.