Alloy steel is steel alloyed with different elements in total amounts between 1 and 50% by weight to enhance its mechanical properties such as strength, hardness, toughness and wear resistance. Low-alloy steels, on the other hand, are used to achieve better hardenability, which in turn enhances other mechanical properties. AISI 4140H is an H-steel grade alloy steel, commonly called AISI 4140H chromium-molybdenum steel.
| Element | Content(%) |
|---|---|
| Iron, Fe | 96.585 - 97.93 |
| Chromium, Cr | 0.75 - 1.2 |
| Manganese, Mn | 0.65 - 1.1 |
| Carbon, C | 0.37 - 0.44 |
| Molybdenum, Mo | 0.15 - 0.3 |
| Silicon, Si | 0.15 - 0.3 |
| Sulfur, S | ≤0.040 |
| Phosphorous, P | ≤0.035 |
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 1150 MPa | 167000 psi |
| Yield strength | 1050 MPa | 152000 psi |
| Modulus of elasticity | 205 GPa | 29700 ksi |
| Bulk modulus | 140 GPa | 20300 ksi |
| Shear modulus | 80 GPa | 11600 ksi |
| Poisson’s ratio | 0.29 | 0.29 |
| Elongation at break | 17.50% | 17.50% |
| Reduction of area | 55% | 55% |
| Hardness, Brinell | 341 | 341 |
| Hardness, Vickers | 361 | 361 |
| Hardness, Knoop | 369 | 369 |
| Hardness, Rockwell C | 37 | 37 |
| Hardness, Rockwell B | 99 | 99 |
| 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 |
B.S. 708 A 42
B.S. 708 M 40
B.S. 709 M 40
ASTM A304
SAE J1268
SS 2244
JIS SCM 4
JIS SCM 4 H
DIN 1.7225
AFNOR 42 CD 4
UNI 40 CrMo 4
UNI 38 CrMo 4 KB
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.