Heat Treatment of steel


Heat Treatment of steel

Heat treatment is a multi-disciplinary process to change the structure of metals or alloys such as aluminium or steel. The disciplines, heating, softening and cooling improve surface hardness, temperature resistance, shape and strength. 

There are five fundamental heat treatment processes: hardening, case hardening, annealing, normalizing and tempering. Although each process can lead to a different result, all processes contain the three basic disciplines. As a specialist in the market for heat treatment of steel, Holland Dredging Industries offers a wide range of different treatments.

Our heat treatment services include

  • Tempering (hardening and tempering)
  • Soft annealing
  • Solution heat treatment
  • Stress relief annealing
  • Normalizing
  • Treatment to hardness range (+TH=formerly BF annealing)
  • Treatment on ferrite-pearlite structure (+FP=formerly BG annealing)

Our heat treatment key values

  • Quality
  • Technical competence
  • Process control
  • Organized
  • Flexibility

Our competencies in heat treatment

  • General, cold tough and heat resistant structural steels
  • Q & T steels
  • Steels for surface hardening
  • Tool steels for cold and hot work
  • Rust and acid-resistant steels etc.

Heat treatment of ferrous and non-ferrous metals

The most common treatments for ferrous and non-ferrous metals are hardening, tempering and annealing. 


Tempering steel is heating it to a certain temperature to reduce brittleness. The speed of the cooling process does not affect the metal structure, so cooling in still air is sufficient. Temperatures for tempering are lower than temperatures for hardening.


A ferrous metal is hardened by heating it to a certain temperature and then cooling it down quickly by immersing it in a quenching liquid such as Isorapide or Ferroquench.

Technical heat treatment information

Dimensions + weights

  • Operating weight: from 10 kg to 15,000 kg
  • Maximum temperature: 1080°C
  • Maximum l/w/h: 6,700 x 1,700 x 1,240 mm or 5,540 x 2,650 x 1,560 mm


The right medium for your material Basin size 80 m3

Isorapide 277 HM

Highly evaporation-resistant high-performance quenching oil with a very short main steam phase for low-distortion quenching of low- and high-alloy steels.

Ferroquench 2000I

Polymeric water-miscible non-flammable quenching medium, application concentration of approx. 9%. The quenching effect with this application concentration is slightly higher than with a high performance quenching oil for quenching low and unalloyed steels.

Ferroquench HQ-RS

Polymeric water-miscible quenching medium with a concentration of 6%. For shortening the main steam phase of the water and thus uniform and homogeneous cooling of water-hardenable steels.

Basin dimensions each 9500 x 3500 x 3000 mm ( L x W x H )

heat treatment of steel

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