Production and processing temperature characteristics of seamless pipes

The seamless pipe is a medium carbon alloy tool steel, the hot and cold drawing machinery and equipment are very good, the industrial equipment works very well, and the price is low and the source is wide, so it is widely used. Its defect is that the workability is low, and the workpieces of products with high requirements for cross-section specifications and models are not suitable for use.

The temperature of the heat treatment process for seamless pipes is A3+(30~50)℃, which is generally limited in actual operation. Higher heat treatment process temperature can accelerate the heating rate of the product and workpiece, reduce surface oxidation, and can develop a trend. In order to equalize the austenite of the product product workpiece, it is necessary to have sufficient thermal insulation time. If the actual installed furnace capacity is large, it is necessary to appropriately increase the thermal insulation time. Otherwise, there is a high possibility of insufficient compressive strength due to uneven temperature rise. However, if the heat preservation time is too long, there will also be coarse crystals and worrying shortcomings of oxidation and nitriding, which will affect the quality of the heat treatment process. Everyone thinks that if the furnace load exceeds the division of the process document, the heating and thermal insulation time needs to be increased by 1/5.

Due to the low processability of seamless pipes, a 10% solution with a large cooling rate should be used. When the product workpiece enters the water, it should be hardened, but it is not cold through. If the product product workpiece is cooled through in edible salt water, it will likely cause the product product workpiece to crack. When the temperature reaches about 180℃, the rapid transformation of austenite into martensite results in excessive structural stress field. Therefore, when the workpiece of the heat treatment process product is rapidly cooled to this temperature region, the slow cooling method should be used. Because the temperature of the effluent, the effluent, and the effluent cannot be grasped, it must be controlled by work experience. When the product and the workpiece in the water are shaking and stopped, the water can be discharged and the water can be cooled by air (if it can be oil-cooled stronger). In addition, the water seepage of the product workpiece should not be static, and should be designed according to the graphic shape of the product workpiece, and standardized exercise and fitness should be carried out. The unmoved refrigeration chemicals and the unmoved product workpieces result in uneven compressive strength and uneven stress field, resulting in large deformation and even cracking of the product product workpieces.