Skip to main content

Through hardening steel stockholders

Through hardening steel properties

Through hardening is a process used to improve the hardness and tensile strength of steel. The process involves heat treatment followed by a rapid quench technique to alter the structure of the steel, thereby increasing its strength. In contrast to case hardening, which strengthens only the outer layer of the material, through hardened steel is strengthened all the way through from the surface to the core, hence the term “through hardening”.

Typical materials used for through hardening include…

  • Medium to high carbon steel
  • Medium carbon alloys steel
  • Cast Iron

Call now on 01457 866911

to talk to one of our advisors for more information, or email us at [email protected]

Download our latest steel stock brochureOrder through hardening steel

Through hardening steel grades available in bright and/or black bar

High Peak Steels stock an extensive range of through hardening 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.

Through hardening steel grades listed are available in either bright or black bar in square, round and flat formats.

Through hardening steel - common questions

What is the process of through hardening steel?

Typically, through hardening steel is a 3 step process…

  • Heating
    The steel is first heated to a critical temperature
  • Quenching
    The steel is then cooled rapidly in water or oil
  • Tempering
    Finally, the steel is reheated to eliminate brittleness

What are the benefits of through hardening steel?

  • Through hardening steel provides a good balance of strength through the entire section of the steel.
  • Improved wear resistance and fatigue life
  • Levels of hardness can be customised during tempering
  • Through hardening is relatively low cost

What are the common applications of through hardened steel?

Due to its robust core, through hardened steel is suitable for components that require good wear resistance and durability. These include roller bearing components, axles and camshafts for the automotive industry. 

Through hardening steel vs case hardening steel

Given case hardening steel offers increased surface strength and resistance to wear and corrosion, without the increased brittleness of through hardened steel, you might wonder why not just employ the case hardening process?

One of the main advantages of through hardening is that it produces a more uniform hardness throughout the entire component. Because the cooling process is much faster than in case hardening steel, the formation of different microstructures within the steel is avoided. Also, through hardening is less likely to cause warping or distortion in the steel.

Both through hardening steel and case hardening steel processes produce high-quality steel components that meet specific performance requirements, while staying within budget constraints. Which one will work best for your application depends on factors like cost considerations, required strength and toughness levels, and expected service life.

080M40 / EN8 Through hardening steel

080M40 | EN8 is a medium carbon steel which is used in applications where better properties than mild steel are required, at a lower cost than an alloy, making this an excellent alternative to alloy.

Applications, chemical compositions and mechanicals 080M40 / EN8 steel

080M40 steel enquiry

Black round

080A42 / EN8 Through hardening steel

080A42 | EN8 steel is an unalloyed carbon steel with reasonable tensile strength. Heat treating this engineering steel provides a good surface hardness.

Applications, chemical compositions and mechanicals 080A42 / EN8 steel

080A42 steel enquiry

Bright roundBright square

212A42 / EN8DM Through hardening steel

212A42 | EN8DM is a bright drawn medium carbon semi-free cutting steel, suitable for repetition machining, good for induction hardening.

Applications, chemical compositions and mechanicals 212A42 / EN8DM steel

212A42 steel enquiry

Bright round

070M55 / EN9 Through hardening steel

070M55 | EN9 steel is a medium carbon steel with good tensile strength. It possesses good wear resistance, but poor weldability.

Applications, chemical compositions and mechanicals 070M55 / EN9 steel

070M55 steel enquiry

Black roundBlack square

150M19 / EN14A Through hardening steel

150M19 | EN14A  is a low carbon manganese steel which is weldable and has good impact resistance. EN14A machines like mild steel.

Applications, chemical compositions and mechanicals 150M19 / EN14A steel

150M19 steel enquiry

Black round

709M40T / EN19 Through hardening 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 Through hardening 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 Through hardening 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

Should you not see the grade or format of through hardening 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