how to calculate soaking time in heat treatment

This table is intended to be used as a guide only and should not be construed as being a mandatory requirement. SOAKING PERIODS. Furnace temperatures are key of course. Well, we start with a batch of the material (metallic material) that is at room temperature…we need to heat it to some high enough temperature (like the Upper critical temperature for most steels) - that … during heat up is 50 Standard Cubic Feet Per Minute (SCFM), the heat required to heat the make-up air will be: 50 SCFM x (4000F-700F) x 1.1 … Also check: Raw materials used in … Figure 4. shows the effect of soaking time on the duc- tility of 40% cold-drawn steel subjected to an ansnealing treatment at 900˚C. H = f [T (C + In t)]…. So..the spec in question requirement is as follows: ''60 minutes minimum plus a further 60 minutes per each inch (25.4 mm) of thickness or fraction thereof.'' Heat Treating Overview Heat treating, as the name implies, is a series of treatments in which heat is used to alter the properties of a metal or alloy. Soaking: is the stage at which the complete part of the heated metal completely changes in its structure. (7.4) where, C is a constant, whose value depends on the composition of austenite. A group of field welds may be included on a single PWHT Instruction Sheet provided the holding time and heat treatment temperature range are identical and the heat treatment of the field welds will be recorded on … Heat treatments are used for a variety of … T.O. SSS designee prior to each post weld heat treatment operation and forwarded to the operator performing the PWHT. please correct me if I'm wrong, but pwht is the heat treatment for the welds of the base metal. F, soaking for two hours at temperature, furnace cooling 50 degrees F per hour to below 1200 degrees F followed by air cooling. The mass of the metal will determine the time it will be soaked. The soak band is the area that is heated to, within the specified PWHT temperature and time range. The single parameter which expresses two variables time and the temperature, i.e., T (C + In t] is called … The heated band is the area covered by the heating elements, the temperature at the edge of the heated band generally being required to be at least half that of the soak … Some shops anneal late in the day after all other heat treating has been finished by simply soaking the part to be annealed at the proper annealing temperature and then turning the furnace off. Hold Times for Different Heat Treatment Processes It shows a decreasing ductility with increasing soaking time up to 40 minutes soaking time The period of soaking is governed by both the size of the section and the nature of the steel. tensile strength with increasing soaking time with a steep drop in value between 30 and 40 minutes soaking time. On this basis, code PWHT requirement, which exludes process consideration, is entirely on the thickness of the base metal joint for the type of metal in consideration. Because time at temperature is also important, heat treatment can be further defined as a series of time-temperature treat-ments. To carry out the approximation process, heat treatment engineers measure item thickness, then there’s the time that the part is held at the soak temperature. My interpretation is that the soaking time will be 60 mins plus 60 mins for each inch or fraction of a inch of thickness. 1-1A-9 2-62. In other word, soaking is when a part of a metal evenly becomes red due to it been subjected to heat for some time. Table 2-1 indicates in a general way the effect of size on the time for soaking. Soaking time for P1 Material as per Table 331.1.1 ie 2.4min per mm so in your case its 46 X 2.4minutes = 110.4 minutes (minimum) 2. 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