Introduction
Alloy or alloyed steels are defined by the ISO specification 4948/1 in the following manner. Alloy steels are those containing any element listed below in a quantity equal to or greater than the quantity for that listed element.
Al 0.10%, B 0.008%, Bi 0.10%, Cr 0.30%, Co 0.10%, Cu 0.40%, Mn 1.65%, Mo 0.06%, Pb 0.40%, Se 0.10%, Si 0.50%, Te 0.10%, Ti 0.05%, W 0.10%, V 0.10%, Zr 0.05%, Lanthanides (each) 0.05%, other specified elements (except C, S, P, N) 0.05%.
Alloy Steel - S156
S156 is a high strength VAR steel having a tensile strength of between 1320-1520 MPa.
The supply of material is in the annealed/softened condition and develops a hard wear resistance case after surface treatment.
Specifications
Alloy Steel S156 from Dynamic Metals is available in the following specifications:
16NCD17
W.Nr 1.6722
W.Nr 1.6723
Chemical Composition (Wt %)
The chemical composition of Alloy Steel S156 from Dynamic Metals is given in the table below:
| C | Si | Mn | P | S | Cr | Mo | Ni | Fe | |
| Min | 0.1 | 0.1 | 0.3 | - | - | 1 | 0 | 4 | Bal |
| Max | 0.2 | 0.4 | 0.6 | 0.02 | 0.01 | 1 | 0 | 4 | - |
Mechanical Properties
The mechanical properties of Alloy Steel S156 are given in the table below:
| 0.2% proof Stress (MPA) | Min: 1030 |
| Tensile Strength (MPA) | Min: 320 Max: 1520 |
| Elongation (%) | Min: 11 |
| Reduction of area (%) | Min: 40 |
| Izod Impact (ft lbf) | Min: 30 |
The hardness of alloy steel S156 in Normalized and Softened Condition is 277 HB Max.
Applications
The applications of Alloy Steel S-156 are:
Helicopter and aircraft gears
Motor sport gears
Source - Dynamic Metals
(www.steelguru.com)
