Large particles fall apart into smaller ones. The oil performance duration depends on the quenching tub loop system design and the operation of the temperature stabilisation system. 0000033209 00000 n 0000016454 00000 n 0000033753 00000 n 1. Quenching Oils. Fast quench oils contain selected accelerators or wetting agents to provide this maximum rate of cooling. xref Some oils control distortion and reduce the risk of cracking of a highly hardenable alloy by ensuring that there is not much variation between the surface temperature and the core temperature during a quench. The oil is not in danger as long as it works at a low or moderate temperature. 0000004095 00000 n 0000022803 00000 n 0000049764 00000 n This reaction takes place at a very slow rate at the ambient temperature but, as the temperature goes up, the reaction rate increases rapidly. 0000023868 00000 n 0000000016 00000 n Some of them change into the gaseous state, some unstable particles polymerise to form non-soluble sediments. 0000018356 00000 n 0000008719 00000 n Używając tej strony wyrażasz zgodę na używanie cookie, zgodnie z aktualnymi ustawieniami przeglądarki. 0000007135 00000 n 0000016822 00000 n 0000001755 00000 n 0000084789 00000 n The other physical properties of quenching oil can also have a significant effect on how efficient it is at quenching a particular steel type. If the acid value increases beyond 1.8 mgKOH/g and viscosity increases by 50%, the oil qualifies to be replaced. 0000008073 00000 n 0000043228 00000 n 0000026916 00000 n 0000008882 00000 n 0000026361 00000 n <]>> 87 0 obj <> endobj xref 87 36 0000000016 00000 n Oil Composition Engineered quench oil is governed by the desired quenching perform-ance, the necessary thermal and ox- After filling the system with oil, deaerate it well. %PDF-1.5 %���� There are specialised quenching oils that have well defined rates of cooling - you may need to use these if you're heat treating something a bit more fancy than high carbon steel. 0000008478 00000 n 0000085451 00000 n 0000002668 00000 n 0000006339 00000 n 0000044164 00000 n 0000090324 00000 n 0000008964 00000 n 0000016264 00000 n 0000008235 00000 n Process to Oil Quench Steel at ThermTech. Używając tej strony wyrażasz zgodę na używanie cookie, zgodnie z aktualnymi ustawieniami przeglądarki. 0000085062 00000 n To get a grip on why oil is a popular quenchant, it’s important to understand what happens in a quench.The succession of heating and then quickly cooling parts via quenching is a way to achieve added hardness to a part that otherwise wouldn’t have been possible. Viscosity, flash point and content of non-soluble sludge must be regularly controlled. %%EOF 0000027327 00000 n The oil performance duration depends on the heating system design and the conditions in which it is operated. Dowiedz się więcej ›, Conventional Emulsifying Machining Oils - User Notes. 0000087616 00000 n 0000009586 00000 n Due to degradation, oil viscosity changes with time. Mineral oils undergo two kinds of aging processes under the impact of high temperatures: Cracking, that is, breakdown of hydrocarbon particles under the impact of heat. 0000086023 00000 n As the oil temperature goes up, degrading factors get activated, which at low temperatures do not carry the hazard of a significant acceleration of the oil degradation process - copper and oxygen, or, to be more general, non-ferrous metals and air. 0000038869 00000 n Different types of oil used in quenching can yield different results, and the type of oil used depends in part upon the type of metal being heat treated. It’s held at this temperature for a time proportionate with the part cross-section. 0000033590 00000 n 0000040035 00000 n 0000042309 00000 n In this case, it is not possible to avoid direct contact with elements heated up to a temperature exceeding the oil … 0000005087 00000 n 0000029242 00000 n 0000003471 00000 n Therefore, to avoid the intensified oil degradation, the system pump should have a sufficient capacity to enable full turbulent flow through the boiler at a speed of 2-3 m/s. Adequate measures can be taken to prevent premature oil degradation. 0000004001 00000 n 0000048887 00000 n Heat is the Enemy of Oils – General Operating Notes. It’s held at this temperature for a time proportionate with the part cross-section. 0000002281 00000 n 0000047189 00000 n 0000003865 00000 n A typical oil has a boiling range between 450ºF (230ºC) and 900ºF (480ºC). Once a year, check the oil acid value and oil viscosity at 100oC. 0000001016 00000 n 0000003639 00000 n 0000028488 00000 n The system should keep a pressure higher than the atmospheric pressure on the suction side of the pumps to prevent air from being sucked by pump and valve chokes. The heating causes changes in the crystalline structure of a metal part’s surface; the rapid cooling “freezes” those changes in place and makes the surface harder.The first stage i… �ڲf������l�F�f���@3ظ�º(�M���`�����c��dC�Ͻd����k�[�{yi�GEY�ge�l���9�f�͝�?o�� 3'LLl�49�i��䬜�����֠0������Ȩ���Т�i�!+W�uu�{�t����Y[�`aUoM��"�?�|ͤ� @>�����i(tt X\ �DPP"�R�:P� h���@' ^ V�� ����� �[ƗLRL���� Fuv��}E�W�0f p3J0�0L�Ndc�~� �>FV��:���]r9o1�cnz0��2�&ss �W"������o���b5c�����L�萋 �T�_7D��. 462 0 obj <> endobj startxref 0000005261 00000 n 0000112863 00000 n In a well-designed system where oil is not thermally overloaded, oil lasts for many years. For a given liquid quenchant, however, the main parameters controlling its quenching severity is its flow speed and to some extent also its temperature.