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Alloy steel stockholders

Alloy steel properties

Technically, all steel is an alloy consisting of a combination of iron and carbon. However, to be deemed to be an alloy steel it must contain one or more other elements in addition to the two basics.

Alloy steel is typically alloyed with several elements such as aluminium, chromium, manganese, molybdenum, nickel and silicon. These elements are added to increase strength, hardness, wear resistance, and toughness.

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Alloy steel grades available in bright and/or black bar

High Peak Steels stock an extensive range of alloy steel, ensuring we can fulfil orders on short lead times and maintain our enviable reputation for over 95% of orders delivered in full and on time.

Steel grades listed are available in either bright or black bar in square, round, flat and hexagonal cross section.

Alloy steel - common questions

What are the different classes of alloy steel?

Typically, alloy steel falls into two categories…

  • High alloy steel
    As you might guess,  this is steel with a high percentage of alloy elements. High alloy steels are classed as those with more than 10 wt% of alloying elements.
  • Low alloy steel
    Conversely, low alloy steel has between 1% and 5% of alloying elements. These elements usually (but not exclusively) include chromium, molybdenum and nickel.

What are the benefits of alloy steel?

Whilst carbon steel delivers greater strength, alloy steel has a far greater resistance to corrosion, making it suitable for applications where steel is exposed to the elements.

In addition, alloy steel is more weldable and greater ductility, making it far easier to work with than carbon steel. Whilst carbon steel is relatively inexpensive, alloy steel can be very expensive (depending on the content of the alloying elements).

What are the common alloying elements?

Whilst not exhaustive, this list covers the key alloying elements of alloy steels, along with the properties they exhibit…

  • Manganese
    Increases hardness and strain resistance
  • Chromium
    Increases hardness and wear resistance
  • Nickel
    Increases toughness and corrosion resistance
  • Cobalt
    Improves hot hardness (for cutting tools)
  • Molybdenum
    Increases shock and heat resistance
  • Tungsten
    Improves hardness and heat resistance

Alloy steel vs Carbon steel

Technically, all steel is an alloy, combining iron and carbon. The term “alloy steel” generally refers to steels that contain additional elements, commonly molybdenum, cobalt or manganese. The purpose of these additional elements is to increase hardenability and toughness after heat treatment.

Alloy steel can be categorised as low alloy or high alloy steel, which (not surprisingly) refers to the amount of additional elements contained within the alloy.

The key differences between carbon steel and alloy steel can be summarised as follows.

  • Alloy steel offers greater corrosion resistance than carbon steel
  • The strength of alloy steel is relatively lower than that of carbon steel
  • Alloy steel offers greater weldability than carbon steel
  • The melting point of alloy steel is greater than that of carbon steel
  • Alloy steels have higher melting points than carbon steel
  • The ductility (how easily a steel can be manipulated) of alloy steel is higher than that of carbon steel

605M36T / EN16 Alloy steel

605M36T | EN16 is a high tensile steel through hardening which has excellent ductility and good shock resistance, ideal for manufacturing pistons and high tensile nuts & bolts, as well as high load couplings.

Applications, chemical compositions and mechanicals 605M36T / EN16 steel

605M36T steel enquiry

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709M40T / EN19 Alloy steel

709M40T | EN19 is a high quality alloy steel with tensile strength, good ductility and shock resistance, making it ideal for load bearing, such as engine gear boxes.

Applications, chemical compositions and mechanicals 709M40T / EN19 steel

817M40T / EN24 Alloy steel

817M40T | EN24 is a very high strength steel alloy which is supplied hardened and tempered ideal for gears. The grade is a nickel chromium molybdenum combination.

Applications, chemical compositions and mechanicals 817M40T / EN24 steel

826M40 / EN26 Alloy steel

826M40 | EN26 in round bar hot rolled and heat treated to ‘W’ condition. It is suitable for applications which require higher tensile and yield strength than 817M40 or 826M31 specifications.

Applications, chemical compositions and mechanicals 826M40 / EN26 steel

826M40 steel enquiry

Enquire about EN26

722M24 / EN40B Alloy steel

722M24 | EN40B is a chromium-molybdenum nitriding steel characterised by its suitability for nitriding which promotes high wear resistance.

Applications, chemical compositions and mechanicals 722M24 / EN40B steel

722M24 steel enquiry

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Should you not see the grade or format of alloy steel you require, or if you're looking for advice on which steel grade to choose, talk to one of our advisors on 01457 866911 Or get in touch via our contact page