The bevel form of square tube has a very important role in controlling the internal quality of the weld and the manufacturing quality of the welded structure.

Drill pipe is a steel pipe with a thread at the end, which is used to connect the surface equipment of the drilling rig and the drilling and grinding equipment or bottom hole device at the bottom of the well. The purpose of the drill pipe is to transport the drilling mud to the drill bit and together with the drill bit raise, lower or rotate the bottom hole device.

SSAW steel pipe is made by rolling low-carbon carbon structural steel or low-alloy structural steel strip at a certain helix angle (called forming angle) into a tube blank, and then welding the pipe seams. Steel produces large diameter pipes. The connection methods of ssaw steel pipe include flange connection and groove connection.

There are often some wastes such as automobile oil and dust on the surface of the rectangular tube, which will affect its quality. Therefore, it is very necessary to clean the rectangular tube. The cleaning methods generally include caustic soda solution cleaning, caustic soda solution immersion, electrolytic cleaning, boiling water immersion, etc.

In the processing of stainless steel seamless pipe, we know that for many chemical elements content is standard, the phenomenon of inaccurate element content should be adjusted in time, otherwise it will have a great impact on the quality of steel pipe.

According to the requirements of the LSAW steel pipe produced, reasonably select the steel type, specification, allowable deviation and production method of the required raw materials.

Rectangular tubes are made of hot-rolled or cold-rolled strip or coil as the base material, cold bent and then high-frequency welded sections of square cross-sectional shape and size, with various specifications.

Rectangular tube is a kind of hollow long steel, also known as flat tube, flat square tube or square flat tube. A large number of pipes are used for conveying fluids, such as oil, natural gas, water, gas, steam, etc.