What is thick walled steel pipe

Thick wall steel pipe refers to the pipe diameter and wall thickness ratio of less than 20. Thick walled steel pipe is the pipe diameter and wall thickness ratio of less than 20 steel pipe. Mainly used in petroleum geology drilling pipe the petrochemical cracking tube, boiler tubes, the bearing tube as well as automobiles, tractors, aviation high-precision structural tube.

The biggest difference between thick wall steel pipe and thin wall steel pipe is the pipe wall thickness, in general, are drawn thin-walled steel technology, and general use of hot-rolled thick walled steel pipe technology, if it is used to distinguish between units of measure, then, generally, the wall thickness / diameter equal to 0.02 is thick and thin-walled steel pipe watershed, wall thickness / diameter less than 0.02 thin-walled steel pipe, thick wall steel pipe is greater than in the purposes, the thin-walled steel multi-purpose the pipe. The multi-walled steel hollow parts used in the blank. Pressure as well as an important channel to use. 

Thick walled steel mainly used in water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction. For the transport of liquids: water supply and drainage. For gas transportation: gas, steam, liquefied petroleum gas. For structural purposes: as piling pipe for bridges; docks, roads, buildings and other structures tube. 

The key of quality for thick wall steel pipe should be thickness uniformity, thick walled steel pipe wall thickness is not controlled directly affect the quality and usefulness of steel pipe, thick wall steel pipe, large diameter seamless steel pipe for general use in a variety of machining, thick wall parts processing, uniform wall thick-walled steel pipe will directly affect the quality of post-processed parts, thick-walled steel pipe wall is not controlled, the overall quality of steel is not strictly. 

Welding thick walled steel pipe firstly clean oil, paint, water, rust, etc., then the groove wall, opened a large number of thick, thin it to open a small number (angle grinder), then that is on the product gap, rod or wire diameter is generally 1 - 1.5 times, if you are not careful groove was opened a few words can be appropriate to stay small. Tack welding at least three o'clock, four o'clock generally good work. Welding welding time should be half and half, starting from the lowest point, preferably more than a centimeter or so, so good from the opposite connector. If the pipe wall thickness, it should be layered, at least two layers, the first layer of the whole circle until they have finished welding can weld the second floor.

Thick Walled Large Diameter LSAW Pipe

Size: OD :351-1050mm, thickness :8-30mm 
Material: 20 #, 16Mn, Q235B, Q345B, X42, X52, X70, alloy steel, stainless steel. 
Standard:GB/T3091-2001, GB/T 3092-1993, GB/T 9711.1-1997, GB/T9711.2, GB/T9711.3t etc.