Stress Relieving Service
STRESS-RELIEF HEAT TREATING is used to relieve stresses that remain locked in a structure as a consequence of a manufacturing sequence. This definition separates stress-relief heat treating from postweld heat treating in that the goal of postweld heat treating is to provide, in addition to the relief of residual stresses, some preferred metallurgical structure or properties. For example, most ferritic weldments are given postweld heat treatment to improve the fracture toughness of the heat-affected zones (HAZ). Moreover, austenitic and nonferrous alloys are frequently postweld heat treated to improve resistance to environmental damage. Stress-relief heat treating is the uniform heating of a structure, or portion thereof, to a suitable temperature below the transformation range, holding at this temperature for a predetermined period of time, followed by uniform cooling. Care must be taken to ensure uniform cooling, particularly when a component is composed of variable section sizes. If the rate of cooling is not constant and uniform, new residual stresses can result that are equal to or greater than those that the heat-treating process was intended to relieve. Stress-relief heat treating can reduce distortion and high stresses from welding that can affect service performance. The presence of residual stresses can lead to stress-corrosion cracking (SCC) near welds and in regions of a component that has been cold strained during processing. Furthermore, cold strain per se can produce a reduction in creep strength at elevated temperatures. Residual stresses in a ferritic steel cause significant reduction in resistance to brittle fracture. In a material that is not prone to brittle fracture, such as an austenitic stainless steel, residual stresses can be sufficient to provide the stress necessary to promote SCC even in environments that appear to be benign.
|Material Used||Hastelloy, Inconel, Ferrous Metal, Monel|
|Used Product Certification||ISO 9001|
|Type OF Furnance Used||Batch Furnance|
|Services Include||Air Hardening & Tempering|
We treat the unwanted internal stresses which lowers the endurance limit of individual parts leading to different types of risks. With the help of our expert and experienced team members, we provide Stress Relieving Service for welded & heat treated objects. In the present scenario large structure are made by fusion welding and the problem of stress needs to be administered with expertise. When welding or other heat treatments are done, it makes certain changes in material density & its intrinsic molecular properties which develop stress. These internal stresses are treated by us with the usage of modern methods & equipment.
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