Huzhou Nanxun Yintuo Special Material Technology Co., Ltd. specializes in the development and production of high-quality stainless steel seamless tubes and nickel-nickel alloys. In the stainless steel seamless pipe production workshop, the hot-rolling process consisting of billet heating, piercing, continuous rolling, stretch reduction and sizing is the most critical process in the entire stainless steel seamless pipe production.
The raw material billet used for the rolling of stainless steel seamless steel pipes is generally heated by a ring-shaped walking heating furnace, which is a rotary hearth furnace with the bottom of the furnace rotating in a ring shape. In billet heating, different steel grades generally have different heating time requirements, so it is necessary to centrally load furnaces in batches according to requirements, and billets of different steel grades must follow certain furnace charging rules.
Perforation is the first process of billet deformation. The solid billet heated to a specified temperature and time is turned into a hollow capillary using a piercing machine. The capillary has a circular section with thicker wall thickness, shorter length, and poor internal and external surface quality. In order for the capillary tube to be processed normally in the subsequent process, the production rhythm of the piercing machine must be adapted to the rhythm of the heating furnace tube billet discharge and the rolling mill. The punched capillary tube must have uniform wall thickness and geometric dimensional accuracy to meet certain requirements. There must be no scars on the inner and outer surfaces , Folds, cracks and other obvious defects, the final rolling temperature of the capillary tube can reach the temperature required for rolling.
Tube billet rolling is a process of determining the inner diameter. It turns the thick-walled capillary into a waste tube close to the wall thickness of the finished product. Modern rolling processes usually determine the wall of the waste tube in the continuous rolling process based on the subsequent process reduction and rolling experience models. thick. The continuous rolling mill is the core equipment of the rolling process. A continuous rolling mill consists of a certain number of rolling mills. Each rolling mill is composed of a set of rolls and stands. The rolls are installed on the stands. Choose the corresponding roll to install the rolling mill.
As the last process of the hot-rolled steel pipe, the sizing and sizing process is used to eliminate the inconsistency in the outer diameter of the waste pipe after the rolling process by using a sizing (reducing) machine, and improve the outer diameter accuracy and roundness of the hot-rolled steel pipe to make the same The error of the outer diameter and wall thickness of the batch of steel pipes is within the range specified by the standard.
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