Warm machining method for making stainless steel pipe

Abstract

The invention discloses a method for manufacturing a stainless steel pipe by warm processing, which belongs to the metal pipe rolling technology. It is carried out in sequence according to the following steps, the surface of the tube blank is machined; the tube blank is preheated to between 400 ℃ and the recrystallization temperature; Rolling at high deformation rates in the range of 280 to 500 rpm; cooling of the rolled stock. The invention overcomes the disadvantages of the prior art, such as many processes, low yield, high manufacturing cost and unstable quality of finished products. The elongation coefficient of the invention is between 10 and 16, the rolling speed is between 10 and 20m / min, the tensile strength and elongation of the pipe are respectively 450MPa to 550MPa and 30% to 40%; the length of the pipe can reach more than 180m ; The overall rate from the tube blank to the finished product is about 80%, which is an advanced method of manufacturing stainless steel tubes by warm processing.

Description

technical field

[0001] The invention belongs to the metal pipe rolling technology. Specifically relates to a method for processing and manufacturing stainless steel pipes. Background technique

[0002] The existing manufacturing methods of stainless steel pipes mainly contain two kinds of perforated tube billet rolling method and stainless steel strip forming welding method. These two traditional processing methods, the former is to send the solid stainless steel billet to a 2-roll or 3-roll piercer after being cut to length and reheated to be pierced into a blank tube, and then the blank tube (tube billet) is passed through hot rolling or Cold rolling, processing and manufacturing into finished pipes. Said this manufacturing method is generally used at present. However, this processing method has many processes, high energy consumption, low yield (only about 60%), inability to process and manufacture ultra-long pipes, and high pipe manufacturing costs, and lacks market c...

Examples

Embodiment Construction

[0016] The present invention will be further described through the following specific embodiments, so that the technical solutions and features of the present invention to achieve its purpose can be understood more clearly.

[0017] One of the typical implementations of the present invention, the rolling is 0Cr19Ni9 (304) austenitic stainless steel pipe. Rolling is carried out on the improved XR-SG90 three-roll planetary tube mill. The tube billet is vertical continuous casting, the initial size is φ90×25mm, the tube billet is processed by milling equipment with 3 milling heads before rolling, and the cutting depth is 0.5mm, so that the surface of the tube billet is non-oxidized and bright. Then online preheating. The electric induction coil is used to heat, so that the head of the tube blank is preheated to 850°C within a length of 300mm, and the other parts are preheated to 500°C. Then carry out rolling processing by the improved XR-SG90 three-roller planetary pipe mill. ...

technical field

[0001] The invention belongs to the metal pipe rolling technology. Specifically relates to a method for processing and manufacturing stainless steel pipes. Background technique

[0002] The existing manufacturing methods of stainless steel pipes mainly contain two kinds of perforated tube billet rolling method and stainless steel strip forming welding method. These two traditional processing methods, the former is to send the solid stainless steel billet to a 2-roll or 3-roll piercer after being cut to length and reheated to be pierced into a blank tube, and then the blank tube (tube billet) is passed through hot rolling or Cold rolling, processing and manufacturing into finished pipes. Said this manufacturing method is generally used at present. However, this processing method has many processes, high energy consumption, low yield (only about 60%), inability to process and manufacture ultra-long pipes, and high pipe manufacturing costs, and lacks market c...

Examples

Embodiment Construction

[0016] The present invention will be further described through the following specific embodiments, so that the technical solutions and features of the present invention to achieve its purpose can be understood more clearly.

[0017] One of the typical implementations of the present invention, the rolling is 0Cr19Ni9 (304) austenitic stainless steel pipe. Rolling is carried out on the improved XR-SG90 three-roll planetary tube mill. The tube billet is vertical continuous casting, the initial size is φ90×25mm, the tube billet is processed by milling equipment with 3 milling heads before rolling, and the cutting depth is 0.5mm, so that the surface of the tube billet is non-oxidized and bright. Then online preheating. The electric induction coil is used to heat, so that the head of the tube blank is preheated to 850°C within a length of 300mm, and the other parts are preheated to 500°C. Then carry out rolling processing by the improved XR-SG90 three-roller planetary pipe mill. ...