When cold-drawn seamless pipes are processed and manufactured, in order to better meet the good compressive strength and strength, it is necessary to pay attention to the key points at each stage during quenching and refrigeration.
actual effect.
Regarding the refrigeration of this product during processing and manufacturing, the technical standards used here are very high.
Cracks or shrinkage of seamless steel pipes.
Cold-drawn seamless pipes will be deformed due to the re-distribution of thermal stress during machining and manufacturing, and the precision of processing cannot be ensured. In addition, the processing of large spare parts is not
into internal stress. This product must be terminated in stress relief after initial processing.
During refrigeration, the surface layer and some cross-sections often cause milky white, milky white and hard and brittle structures. Laser cutting is not very good, and it is easy to apply when detached. Therefore, general products require
Fire to eliminate welding defects, most of the quenching or quenching temperature is in the middle of 850-950℃. The temperature is maintained for 1-2 hours, and pearlite is formed into high-purity graphite and martensite. in the next furnace
Secondary pearlite and hypereutectoid steel pearlite will be generated into high-purity graphite. After that, the metallographic structure or the cultivation matrix of the metallographic structure is added with ferrite, thereby reducing the strength of the casting
Degrees, if required to develop the product's wear resistance, heating, insulation without the need for a stove and the use of air-cooled. Except for the whole process of concrete powder and fine sand at 850-950 ℃, it is only
The formation time of refrigerated pearlite in the process can reduce the strength of the product, and also can obtain a ferritic substrate, which adheres to a special compressive strength and strength.
On top of that, when cold-drawn seamless pipes are refrigerated, if they want to process and manufacture high-quality products, they need to strictly control each stage.
