There are two main types of stainless steel plates: hot-rolled and cold-rolled. Cold-rolled and hot-rolled are two different steel-rolling technologies. As the name implies, cold-rolled steel is rolled at room temperature. This kind of steel has a high hardness. Hot rolling means that the steel is rolled under high temperatures. Hot rolling, the temperature of its stainless steel rolling is more top, the deformation resistance is small, and it can show a large amount of deformation. And because the width-thickness ratio of the stainless steel plate is small, the dimensional accuracy requirements are relatively low, and it is not easy to produce plate shape problems, mainly to control the convexity. If there is a requirement for the metal structure, the microstructure and mechanical properties of the stainless steel sheet are usually controlled by controlling the open rolling temperature, final rolling temperature, and coiling temperature of the finish rolling.
Seamless Stainless Steel Pipes also called stainless steel seamless pipes, are made of steel ingots or solid tube blanks by a perforation to make capillary tubes, which are then made by hot rolling, cold rolling, or cold dialing. The specification of seamless steel pipe is expressed by the outer diameter * wall thickness in millimeters.
The manufacturing process of stainless steel cold and hot-rolled pipes is quite different. In this article, the Hot Dip Galvanized Steel Sheet Suppliers first, introduce the production process of hot rolled stainless steel pipes.
The general production process of hot-rolled stainless steel pipes mainly includes the following steps:
Round tube billet → heating → perforation → three-roller cross-rolling, continuous rolling or extrusion → tube removal → sizing (or reduced diameter) → cooling → billet → straightening → hydraulic test (or flaw detection) → marking → storage
The round tube billet is the raw material for rolling stainless steel seamless pipe, which needs to be cut into a billet of about 1 meter by a cutting machine, and then sent to the furnace for heating by a conveyor belt. The the temperature of the heating billet in the furnace is about 1200 ° and the fuel is acetylene or hydrogen. The key to this step is to control the temperature in the furnace.
After the round tube billet is released from the furnace, it is perforated by a pressure piercer. The punching machine is generally a tapered roller punching machine. This kind of punching machine has high production efficiency, excellent product quality, a large amount of perforation expansion, and can wear many types of steel. After the perforation, the round tube blank is successively rolled, rolled, or squeezed by three rolls.
After squeezing, it is taken off the pipe and sizing. The sizing machine rotates into the steel embryo through the conical drill bit at high speed to drill and finally forms the steel pipe. The inner diameter of the steel pipe is determined by the outer diameter length of the sizing machine bit. After sizing the steel pipe, it enters the cooling tower and is cooled by water spray. After cooling, it is straightened.
After straightening, the Mild Steel Tube is directly sent to the metal flaw detector through the conveyor belt for internal inspection. This step mainly detects whether there are cracks, bubbles, etc. inside the stainless steel tube. This was followed by a more rigorous manual selection. After the final quality inspection is completed, the stainless steel pipe will be sprayed with the production number, batch number, specifications, etc., and finally enter the warehouse.