Steel pipe knowledge How is seamless steel pipe manufactured?

Production process of large-diameter alloy seamless steel pipe Production process of large-diameter alloy seamless steel pipe. It includes the following steps: step one, material preparation; Step two, tube blank heating and oblique rolling perforation; Step three, capillary trimming; Step 4, thermal expansion deformation sizing; Step 5, heat treatment; Step six, straightening; Step 7, internal grinding; Step eight, deviation correction; Step 9, external grinding; Step 10, flaw detection; Step 11, then finishing, final inspection and packaging.

The present invention can not only produce high-grade alloy seamless steel pipe within the range of large group distance, but also the investment is relatively small, and the product quality is high, the production efficiency is higher, and the production cost is lower. The main production process of seamless steel pipes Tube blank and billet heating, tube blank perforation, steel pipe extension, steel pipe rolling, steel pipe sizing and reducing, steel pipe cooling and finishing, or it can be said that the heating of steel billet, perforation, hot pickling, cold drawing, charcoal burning, cutting head, spraying, packaging, finished products. A manufacturing method of seamless steel pipe, characterized in that:

After rolling the seamless steel pipe on such a manufacturing production line, the wall thickness of the rolled steel pipe in the circumferential direction of the rolled steel pipe is measured at multiple points, and according to the measurement results, the positions of each shaft of each shaft of the roll on the final rolling base of the mandrel seamless tube rolling mill are controlled at least separately so that the uneven wall thickness is minimized.

Shandong Pilot Steel Pipe **** perennial sales of Chengdu Iron and Steel Group, Metallurgical Group, Baotou Steel Mill, Baosteel Group, Anshan Iron and Steel Group, Tianjin Seamless, Xining Special Steel Plant, Wuxi Steel Mill, Hengyang Steel Mill and other major steel mills of large and small diameter seamless steel pipes, high and low pressure boiler tubes, alloy steel tubes, 16mn seamless steel pipes, welded steel pipes, 16mn alloy pipes, fertilizer pipes, geological pipes, cold-drawn steel pipes, petroleum cracking pipes, precision steel pipes, fluid pipes, stainless steel pipes, etc.

Seamless steel pipes are made of steel ingots or solid tube blanks perforated to make capillaries, and then hot-rolled, cold-rolled or cold-dialed.

The main production process of hot-rolled seamless steel pipe (main inspection process):

Preparation and inspection of pipe blanks, heating of pipe blanks, perforation, rolling of pipes, reheating of steel pipes, calibration (reduction), heat treatment, straightening of finished pipes, finishing inspection, inspection (non-destructive, physicochemical, and bench inspection) Warehousing.

The main production process of cold-rolled (drawn) seamless steel pipe:

Blank preparation, pickling and lubrication, cold rolling (drawing), heat treatment, straightening, finishing, inspection.

In the process of making seamless steel pipes, they need to be made in the same furnace, and hot molten steel needs to be poured into a special mold.

In fact, it is to use a steel plate to make it into the shape of a pipe, and then strengthen it through computer simulation technology, and then make it into a glue, and sew it up.

First, the recovered steel is first refined into water, and then the melted water is poured into the model, which is usually completed step by step on the assembly line.

A steel pipe made of a single piece of metal with no joints on the surface is called a seamless steel pipe answering state. Its main uses are:

1. It is used as a pipeline or structural part for transporting fluid.

2. According to different uses, it is divided into three categories**: according to chemical composition and mechanical properties**, according to mechanical properties**, and according to hydraulic test**.

3. Special seamless pipes include seamless pipes for boilers, seamless steel pipes for chemical power, geological and petroleum seamless pipes, etc.

4. Seamless steel pipes have hollow cross-sections, which are widely used as pipelines for transporting fluids, such as pipelines for transporting oil, Tianqing wheel source gas, gas, water and some solid tung materials.

Seamless steel pipe, as the name suggests, is a seamless, continuous, long tubular steel, its internal quality is uniform, the thickness is consistent, the anti-corrosion ability is strong, widely used in petroleum, chemical, aerospace, military and other fields.

To make seamless steel pipes, we must first prepare raw materials, generally select high-quality steel plates as raw materials, and make seamless steel pipes through multiple processes such as rolling, drawing, cold drawing or hot drawing. Among them, hot rolling, cold drawing, and hot drawing are the most commonly used manufacturing methods.

In the hot rolling process, the billet is heated to a high temperature, then pressed into a tube shape by a multi-roll mill, and then processed by gradual cooling. This process requires temperature and speed control to ensure the quality of the pipes.

In the cold drawing process, the heated billet is rolled and drawn several times to form a seamless steel tube. During this process, the wall thickness of the steel pipe gradually decreases, but its cross-sectional area remains the same.

The hot drawing process is similar to hot rolling and cold drawing, but the tube is heated to a flexible and easier to draw during processing, and then drawn several times until the desired seamless tube is formed.

In any process, the production of high-quality seamless steel pipes requires professional technical support. Different manufacturing processes and materials will determine the quality of the final product, therefore, manufacturers need to be careful at every step and strictly control every step to ensure the production of high-quality seamless steel pipes.

In conclusion, seamless steel pipe is an important steel product, and it is widely used in many fields. Various technical details need to be mastered in the production process to ensure the production of high-quality steel pipes.

Hot or cold drawn. The so-called cold is to use oil to lubricate the billet from the thick-walled pipe without heating, and use the steel ball sleeve to gradually elongate. Hot drawing is to simmer the billet pipe red to do such a job, and the general application of thick walls.

Seamless steel pipes are formed by cold drawing and hot rolling.

Overview of the two steel pipe processes:

1. Cold-drawn (rolled) seamless steel pipe: round tube blank heating, perforation, heading, annealing, pickling, oiling (copper plating), multi-pass cold drawing (cold rolling) billet tube, heat treatment, straightening, hydrostatic test (flaw detection), marking and warehousing.

2. Hot rolling (extruded seamless steel pipe): round tube billet heating perforation three-high oblique rolling, continuous rolling or extrusion pipe removal sizing (or reducing diameter) cooling billet pipe straightening hydrostatic test (or flaw detection) marking warehousing.

Heating - perforating machine perforation - rolling mill rolling - correction - cooling bed - straightening - saw head - baling.