Heat treatment is one of the most important manufacturing process for piping products(steel pipes,pipe fittings and flanges),when done properly,heat treatment can alter the mechanical and physical properties of metals without changing their shape.When done wrong,the results are less than desirable.You want to ensure that the material is high-quality by avoiding steel heat treatment problems.Here is the common problems in heat treatment-overheating and under heating.
Heat treatment of steel
What is overheating in heat treatment?
Overheating of the microstructure after quenching can be observed from the rough mouth of the bearing part. However,the exact microstructure must be observed to determine the degree of overheating.If coarse needle-shaped martensite appears in the quenched structure of GCr15 steel,it is quenched and superheated.The formation may be caused by excessive overheating of the quenching heating temperature or excessive heating and holding time;or it may be due to the serious banding of the original structure,forming a local martensite needle-like coarseness in the low carbon zone between the two zones.Local overheating caused.The retained austenite increases in the superheated structure,and the dimensional stability decreases.Due to the overheating of the quenched structure,the coarse crystal of the steel causes the toughness of the part to decrease,the impact resistance is lowered,and the life of the bearing is also lowered.Excessive heat can even cause quenching cracks.
What is underheating in heat treatment?
If the quenching temperature is low or the cooling is poor,the tortite structure exceeding the standard is generated in the microstructure,which is called the underheated structure,which lowers the hardness and sharply reduces the wear resistance,which affects the bearing life of the roller parts.
Haihao Group supply piping products more than 30 years,our main products are butt welding/forged 45°/90°/180° elbow,equal/reducing/lateral/barred tee,concentric/eccentric reducer,3D/5D/7D bend,cap,semeless/welded/casing/ERW/SAW/SSAW steel pipe,weld neck/blind/slip on/lap joint/socket weld/threaded/flat/orifice flange,etc.We supply those products according to international standards such as ANSI/ASME,API,BS,DIN,EN,JIS,GOST,MSS,UNI,etc.If you want to know more about our piping products,please email us:sales@haihaogroup.com
