Stress Relieving Services
Stress Relieving :
- STRESS-RELIEVING process 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 . 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 (Ac1 for ferritic steels), 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.
- Size - 3000 X 3000 x 2000 mm
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