Editorial Feature

Alloy Steel - S156 by Dynamic Metals

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.


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 0.14 0.10 0.25 - - 1.0 0.20 3.8 Bal
Max 0.18 0.35 0.55 0.015 0.012 1.4 0.30 4.3 -

Mechanical Properties

The mechanical properties of Alloy Steel S156 are given in the table below:

0.2% proof Stress (MPA) Tensile Strength (MPA) Elongation (%) Reduction of area (%) Izod Impact (ft lbf)
Min: 1030 Min: 320 Max: 1520 Min: 11 Min: 40 Min: 30

The hardness of alloy steel S156 in Normalized and Softened Condition is 277 HB Max.


The applications of Alloy Steel S-156 are:

  • Helicopter and aircraft gears
  • Motorsport gears

About Dynamic Metals

Dynamic Metals sources and supplies high-grade metals with no minimum order quantities and with absolute commitment to customer service. With our extensive experience as specialist metal suppliers, the Dynamic Metals team has the knowledge, expertise and contacts to advise and supply you with a comprehensive range of aerospace-grade metals. These can be supplied with no minimum order charges and, in most cases, same-day or next-day delivery.

This information has been sourced, reviewed and adapted from materials provided by Dynamic Metals.

For more information on this source, please visit Dynamic Metals.

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