steel tube

Seamless tubes are tubes without seams or welds. Seamless steel tubes are considered to be able to withstand higher pressures, higher temperatures, higher mechanical stress and corrosive atmospheres. 1. Manufacturing Seamless steel tubes are manufactured using a number of different methods. The method used depends on the desired diameter, or ratio of diameter to wall thickness, required for the desired application. Generally, seamless steel tubes are made by first casting raw steel into a more workable form—a hot solid billet. It is then “stretched” and pushed or pulled onto the forming die. This results in hollow tubes. The hollow tube is then “extruded” and forced through a die and mandrel to obtain the desired inner and outer wall diameters. In order to ensure that the seamless steel tube meets certain standards, it must be subjected to specific heat treatment to ensure that its metallurgical properties meet the necessary requirements. When required, special piping materials are onl...

Precautions for seamless pipe loading 1. In order to prevent sinking, indentation, scratches and thread damage of the pipe body, it should be hoisted by disk crane, nylon belt or steel wire rope with protective spacer when loading. 2. When hoisting bundled steel pipes, no more than two bundles are allowed to be hoisted at the same time. When the weight of a single bundle exceeds 3000kg, only a single bundle is allowed to be hoisted. 3. It is not allowed to forcibly pull out the nylon belt or steel wire rope when it is pressed by the steel pipe or the pipe bundle. When loading wagons and delivering steel pipes for transportation to the user, due to the restrictions of the shipping conditions, the nylon belt or wire rope must be pulled smoothly to avoid strong collisions between the steel pipes or bundles or rollover of the bundles. Rough loading and unloading is strictly prohibited. 4. When using the tail hook to load and unload the pipe, the pipe end should be prevented from being dama...

The quality inspection method of spiral pipe (ssaw) is as follows: 1. Judging from the surface, that is, in visual inspection. Visual inspection of welded joints is a simple procedure with various inspection methods and is an important part of finished product inspection, mainly to find welding surface defects and dimensional deviations. Generally, it is observed by naked eyes and tested with tools such as standard models, gauges and magnifying glasses. If there is a flaw on the surface of the weld, there may be a flaw in the weld. 2. Physical inspection methods: Physical inspection methods are methods that use certain physical phenomena for inspection or testing. The inspection of internal defects of materials or parts generally adopts non-destructive testing methods. X-ray flaw detection is the most commonly used method for non-destructive testing of spiral steel pipes. The characteristics of this detection method are objective and direct, real-time imaging by X-ray machines, softwar...

Seamless boiler tube is a kind of boiler tube and belongs to the category of seamless steel tube. The manufacturing method is the same as that of the seamless tube, but there are strict requirements on the steel type used in the manufacture of the steel pipe. High-pressure boiler seamless tubes are often under high temperature and high pressure conditions when used, and the pipes will be oxidized and corroded under the action of high-temperature flue gas and water vapor. Steel pipes are required to have high durable strength, high resistance to oxidation and corrosion, and good structural stability. High-pressure boiler tubes are mainly used to manufacture superheater tubes, reheater tubes, gas guide tubes, main steam tubes, etc. of high-pressure and ultra-high pressure boilers. 1. What is a seamless boiler tube hydrostatic test? The seamless boiler tube hydrostatic test is divided into two types: working pressure test and overpressure test. The purpose of the hydrostatic test is to te...

 Anti-corrosion steel pipes generally refer to the use of special processes to carry out anti-corrosion treatment on ordinary steel pipes (such as seamless pipes, welded pipes), so that the steel pipes have certain anti-corrosion properties. Corrosion ability is generally used for waterproof, anti-rust, anti-acid and alkali, anti-oxidation and other characteristics. Generally speaking, PE anti-corrosion steel pipe refers to polyethylene anti-corrosion steel pipe, which is a tubular article processed by advanced science and technology. PE anti-corrosion steel pipes are widely used in oil, natural gas, city gas, city water supply, coal-water slurry pipelines, etc. Corresponding anti-corrosion measures can also be carried out on the inner and outer walls of steel pipes according to different needs. The common ones are epoxy coal tar pitch anti-corrosion steel pipes, polyurethane coating anti-corrosion, cement mortar anti-corrosion on the inner wall of anti-corrosion steel pipes, etc. ...