304 stainless steel thick-walled tube parts to control grain size during heat treatment is necessary, its quality heat-treated 304 stainless steel thick-walled tube has a very important impact. 


Here's how to control the size of its grain size Method Summary as follows.
(1) Choose a reasonable heating temperature
Heating temperature is too low, the process of forming austenitic 304 stainless steel thick-walled tube is slow, can not even fully formed, heat treatment can not achieve the requirements. Heating temperature is too high, it is easy to get coarse austenite grains. Cause performance degradation. It should be a reasonable choice of heating temperature varies depending on several aspects of the chemical composition of 304 stainless steel thick-walled pipe, shape and size of parts, any special requirements, changes in cross section and specific technical requirements.


(2) Determine a reasonable time and best insulation insulation parts for the purpose of heat through it, and 304 austenitic stainless steel components sufficiently uniformly thick-walled tube
Holding time taking into account the two points is too long or caused large austenite grain will extend the production cycle, reduce efficiency, heat treatment is not conducive to control the proper organization of the original original organization affects the starting steel Therefore, the grain size of high carbon tool steels, in order to prevent overheating and increased durability, choose a smaller spherical divergence annealing organization;.. for high-frequency heating of the crystal considered belonging to rapid heating, the heating temperature is high time is short, so the original club after selecting a larger dispersion of fine lamellar pearlite or quenching and tempering treatment organization. Select the essence of fine grain 304 stainless steel thick-walled tube to heat sensitivity of the small nature of fine-grained steel, and therefore completely normal heating conditions ensure fine austenite grains.