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Resisting high dynamic loads by combining strength and toughness

There is a growing demand in many industrial sectors for parts that can withstand extreme loads, but that also need to be made from materials that exhibit good machinability. A typical load of this kind is the dynamic loading to which hydraulic components are exposed. For a component to be able to withstand these forces, it has to be made from a steel grade that offers an ideal combination of strength and toughness.

High dynamic loading means that a component is subjected to continually alternating periods of high and low stress. Examples of components that experience high dynamic loading are those used in hydraulic systems or those that experience high compressive loading. Cyclic loading can cause a component to fracture even if the stress amplitude is significantly below the materials ultimate tensile strength Rm. In many cases, components can fail even if at stress amplitudes below the 0.2% offset yield strength (Rp0.2). If a component is going to be exposed to a combination of load types, particular care is required when designing the component and when choosing the material to be used.

High-strength special steel from Steeltec: strong and tough combined

A material’s tensile strength provides an indication of its fatigue strength. And material strength is critical when components are subjected to powerful stress cycles. Any steel that will be exposed to dynamic loading needs a good combination of strength and toughness.

ETG® and HSX® steels from Steeltec

Steeltec has developed its ETG® and HSX® families of higher strength special steels for just this type of application. Steels that are particularly well suited to handling dynamic loads include:

  • HSX® 110
  • HSX® 130
  • HSX® Z10
  • HSX® Z12

These steels are able to withstand powerful varying dynamic loads.

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Steel Groups


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Free cutting steel Soft free cutting steel
Free cutting steel
Case hardening steel
Case hardening steel With lead
Case hardening steel Unalloyed case hardening steel
Cold heading steel
Chain steel
Construction steel
Quenched and tempered steel
Quenched and tempered steel Unalloyed quenched and tempered steel with lead
Cold heading steel SwissBain
ETG 88 High strength special steel
ETG 100 High strength special steel
HSX 90 High strength special steel
HSX 110 High strength special steel
HSX 130 High strength special steel
HSX Z10 High strength special steel
HSX Z12 High strength special steel
ETG 25 Cold heading steel
ESP 65 Case hardening steel
SwissCut Free cutting steel

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Will the part or component be machined?

Around 85% of the costs in parts manufacturing are attributable to process costs. It is therefore worthwhile to optimize these costs with the targeted use of materials. Steeltec free-cutting steels are optimized for machining. Steeltec has also developed high-strength special products with outstanding machining properties. Short chip breaking, longer tool life and high uniformity across batches open up new possibilities in the design of manufacturing processes.

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Will the part or component be processed asymmetrically?  

High dimensional stability and uniform machining behavior are decisive for an economical and plannable manufacturing process. The manufacturing costs per part are decisive, especially in high-volume production. Our low-distortion steels are designed to meet specified geometries and tolerances and minimize financial risk.

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Will the part or component be subject to a cold-forming process?

The required properties - for example in terms of machinability, cold formability or weldability - can be precisely adjusted to customer specifications during the process. Thanks to very good cold forming properties, steels are formed into components, e.g. fasteners, by cold forming. Depending on the application requirements, they exhibit high strength and high durability. To achieve this, the materials must combine high initial strength with good formability. Special steels from Steeltec enable efficient and resource-saving production.

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Will an additional heat-treatment stage be carried out?

Thanks to in-depth chemical analysis, Steeltec is able to design materials in such a way that desired mechanical-technological component properties are achieved after heat treatment. This results in a wide range of high-quality steel designed to meet individual customer requirements. In the bright steel sector, we will be pleased to advise you on what needs to be taken into account in the case of additional hardening.

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Will the part or component be welded?

Welding is particularly important for chains and structural grades, but also for applications such as the manufacture of wire baskets. Steeltec's rolled steels can be welded using various techniques. Welding requires materials that are alloyed. In addition, just as in bending, the steel needs a certain hardness, but it must be possible to machine it. And it must be possible to heat it without creating too much stress.

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Our high-strength special steels

Optimized for machining

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Efficient and low-maintenance equipment

Steel for hydraulic systems

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Paolo Berti - Head of Customer Service Rolled Steel

Dirk Ochmann - Head of Customer Service Bright Steel