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What is the Effect of Different Tempering Temperatures on Stainless Steel Pipes?

May. 11, 2020

As a Seamless Steel Pipe Supplier, share with you. The alloy contains nearly 9% chromium and 1% molybdenum, and depending on their composition, they are also called 9 Cr 1 Mo steel. The stainless steel tube has a band-shaped martensite phase under hot rolling conditions, resulting in a higher hardness, so tempering treatment is required to reduce the hardness to obtain good workability. The recrystallization temperature of the stainless steel tube is greater than 790 ° C. The low temperature has almost no effect on the structure and performance of Seamless Steel Pipe, and the higher tempering temperature will cause the ferrite phase and structure of the recrystallized structure to be uneven.

Seamless Steel Pipe

Seamless Steel Pipe

Some people have recently conducted experiments to study the effect of structure and hardness on the tempering cooling rate of stainless steel capillaries at different tempering temperatures. The results show that the hardness of 300 ~ 400 ℃ does not change much; at 500 ~ 600 ℃, for the carbide precipitation sensitive area, in which a large number of carbides are dispersed in the matrix precipitation, in this area, the hardness is higher, showing an upward trend; When the temperature rises from 600 ° C to 780 ° C, carbides are fully precipitated along grain boundaries and the hardness decreases. With the increase of the cooling rate of tempering, the hardness gradually decreases. Slow cooling at a speed of 5 ℃ / min in the sensitive range of 500 ~ 600 ℃. The carbides are dispersed and precipitated and the hardness of the matrix is higher. , Fast cooling rate (50 ℃ / min), fast precipitation range of carbide precipitation, less carbide precipitation in matrix, low hardness, good processing performance.

Stainless steel capillaries are used for engineering components, superheater coils, headers and steam pipes, and have a small thickness. Compared with other T series steels, this helps to improve the thermal fatigue life by several dozen times. This allows them to raise the operating temperature to a higher level, thereby increasing the efficiency of the power plant. T91 pipe belongs to ASTM A213, it is made of ferrite and austenitic boiler superheater and heat exchanger seamless steel pipe.

If the stainless steel seamless steel tube is not properly stored, it will greatly reduce its sales, and for a small warehouse, it is impossible to achieve the purpose of properly storing stainless steel seamless steel tube.

The production of stainless steel seamless steel tubes is a unique process technology. The quality of the inner and outer walls is smooth, the appearance is better, and the appearance of the finished products looks more accurate. Inside a warehouse with a certain temperature. Only with such intact storage can the stainless steel seamless pipes be intact.

After the stainless steel seamless steel tube is properly stored, there is no need to worry that it will corrode during use, because the stainless steel seamless steel tube becomes a finished product through special treatment.

Our company also has Black Seamless Steel Pipe for sale, please contact us.


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