Quenching oils

Fluids play a very dominant role especially in the area of heat treatment. The influence of the quenching medium has a direct effect on the structural transformation of the material and thus plays a decisive role in the success of heat treatment.

So that every single heat treatment operation delivers the required results, FUCHS offers a broad spectrum of quenching media: The THERMISOL Series. The products of the THERMISOL series are hardening oils and polymer quenchants which cover all areas of application in the field of heat treatment. 

Our products are formulated to meet all the demands made on today’s quenching media. And we constantly develop our products further so that already today, we can offer our customers application solutions which provide the performance, safety at work, environmental protection and economy which will be necessary in the future.

Bright quenching oils are usually conventional solvates containing a relatively low level of additives. Bright quenching oils are generally used to quench components made of high-alloy materials and with simple geometries.
They are mainly used for the heat treatment of distortion-resistant components.

High performance quenching oils usually contain high levels of additives and special agents which accelerate component wetting.
High performance quenching oils are normally based on conventional solvates.
High performance quenching oils are widely used because optimized wetting behaviour makes them suitable for warp-prone components.

High performance quenchants based on high-quality, low evaporation and low-aromatic hydrocracked oils.
MC - the key is a special manufacturing process in which natural mineral oil is converted by hydrocracking, i.e. under high pressure and high temperatures in the presence of H₂ (hydrogen). This creates a more cost-effective base oil which is comparable to synthetic oils. This base oil together with high-quality additives combines the oxidation stability and the optimum wetting properties of high-performance quenching oils with the thermal stability and extremely low evaporation of hydrocracked oils.
The new development THERMISOL QH 35 MC is a universal high-performance quenching oil with best performance values and high process reliability.

The use of these quenching oils based on synthetic esters is particularly recommended for highly warp-prone components. Apart from their sustainability credentials, these high-performance quenching oils offer a number of other advantages. Synthetic high-performance quenching oils have significantly better wetting properties than their conventional counterparts. These excellent wetting properties ensure that the vapour phase over the whole surface of the component being treated collapses rapidly. This almost simultaneous wetting of the entire component surface significantly reduces the temperature gradients created during quenching and thus ultimately the uneven shape changes known as warping.  

Polymer quenchants are concentrates which are dissolved in water to soften the abrupt quenching of water alone. They enable the controlled dissipation of heat from components.
The products of the THERMISOL QZS Series are recommended for applications ranging from induction hardening to the quenching of low to high-alloy materials. Due to their very mild quenching behaviour, they can also be used for materials which previously could only be treated in oil. A homogeneous microstructural composition and more even hardening can be achieved by correspondingly adjusting the concentration and circulation of the quenchant. Depending on the concentration, applications through to the tool steel area are possible. A particularly long vapour phase can, depending on the material, generate very soft and even bainitic structures. Polymer quenchants are especially suitable for open quenching baths and for constantly changing component geometries.