Warm machining method for making carbon steel pipe and alloy steel pipe

Abstract

A warm machining technology for manufacturing carbon steel pipe or alloy steel pipe includes such steps as conticasting hollow pipe blank, surface machining, preheating to a temp between ambient temp and recrystallizing temp. heating to a temp over the recrystallizing temp, high-speed rolling, and cooling. Its advantages are simple process, high utilization rate of material, low cost and high quality.

Description

technical field

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

[0002] The manufacturing methods of existing carbon steel pipes and alloy steel pipes mainly contain perforated tube billet rolling method and strip forming welding method. The first traditional manufacturing method is to cast carbon steel and alloy steel into a solid billet and cut it to length. After reheating, it is sent to a two-roll or three-roll piercer to be pierced into a blank tube, and then the tube billet is hot-rolled and cold-rolled. Rolled to get the finished pipe. This method is generally used at present, but there are many processes, high energy consumption, inability to produce super-long pipes, and high pipe manufacturing costs. The yield from the solid billet to the first hot rolling pass is only about 80%. The second strip forming welding...

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] In one of the typical implementations of the present invention, what is rolled is a 10# low carbon steel continuous casting hollow tube billet. Rolling is carried out on the improved XR-SG90 three-roll planetary tube mill. The tube billet is produced by vertical continuous casting method, and the initial size is φ90×25mm. Before rolling, the tube billet passes through the milling equipment with 3 milling heads, and the surface treatment is carried out. The cutting depth is 0.5mm, so that the surface of the tube billet is non-oxidized and bright. state, and then preheated online. The induction coil is used to heat, so that the 300mm head of the tube blank is preheated to 800°C, and the other parts are heated to 500°C. Then carry out rolling proces...

technical field

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

[0002] The manufacturing methods of existing carbon steel pipes and alloy steel pipes mainly contain perforated tube billet rolling method and strip forming welding method. The first traditional manufacturing method is to cast carbon steel and alloy steel into a solid billet and cut it to length. After reheating, it is sent to a two-roll or three-roll piercer to be pierced into a blank tube, and then the tube billet is hot-rolled and cold-rolled. Rolled to get the finished pipe. This method is generally used at present, but there are many processes, high energy consumption, inability to produce super-long pipes, and high pipe manufacturing costs. The yield from the solid billet to the first hot rolling pass is only about 80%. The second strip forming welding...

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] In one of the typical implementations of the present invention, what is rolled is a 10# low carbon steel continuous casting hollow tube billet. Rolling is carried out on the improved XR-SG90 three-roll planetary tube mill. The tube billet is produced by vertical continuous casting method, and the initial size is φ90×25mm. Before rolling, the tube billet passes through the milling equipment with 3 milling heads, and the surface treatment is carried out. The cutting depth is 0.5mm, so that the surface of the tube billet is non-oxidized and bright. state, and then preheated online. The induction coil is used to heat, so that the 300mm head of the tube blank is preheated to 800°C, and the other parts are heated to 500°C. Then carry out rolling proces...