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The difference between galvanized products
1) Both the inner and outer walls of the hot-dip galvanized steel pipe are galvanized, while the cold-galvanized steel pipe is only galvanized on the outer wall. 2) The cold plating layer is uniform and the thickness is very thin; the hot plating layer is thick and the thickness is not uniform. ...Read more -
Technical Requirement for Welded Steel Pipe
According to the API/ASTM standards, there are many technical requirements for producing welded steel pipe. The nominal pipe diameter ranges from 6-150mm, nominal wall thickness ranges from 2.0-6.0mm and the length of the pipe is usually from 4 to 10. The pipe surface should be smooth, no collaps...Read more -
Groove connection pipe fittings
Groove connection pipe fittings include two broad categories of products: ①The fittings that play the role of connection sealing include rigid joints, flexible joints, mechanical tees and grooved flanges; ②Pipe fittings for connection transition include elbows, tees, tees, reducers and blind plat...Read more -
Common defects in the welding zone of spiral steel pipes
Common defects in the welding zone of spiral steel pipes bubble Air bubbles mostly occur in the center of the weld bead, and hydrogen is still hidden in the weld metal in the form of air bubbles. The main reason is that the surface of the welding wire and flux has moisture, which is used directly...Read more -
Points to note when cutting rectangular tubes
Points to note when cutting rectangular tubes 1. For the place to be cut, wipe off the oil, debris or mud on the surface of the rectangular tube with a rag or soft cloth. 2. Be sure to select special stainless steel cutting tools. 3. According to the construction drawing and the situation on site...Read more -
Features of pipeline NDT
Features of pipeline NDT The characteristic of non-destructive testing is that it can be tested without damaging the material and structure of the test piece. Therefore, after implementing non-destructive testing, the inspection rate of the product can reach 100%. However, not all items and indic...Read more -
Welding control of thick-walled steel pipes
1. Welding temperature control of thick-walled steel pipes The welding temperature is affected by the high-frequency eddy current thermal power. The high-frequency eddy current thermal power is affected by the current frequency. The eddy current thermal power is proportional to the square of the ...Read more -
Straight seam steel pipe purity improvement
High frequency welded pipe flattening cracking is caused by welding micro cracks, hard and brittle phase inclusions, coarse grain-like structure, etc. In order to control the welding seam well, the concept of welding inclusion crack index is proposed. Mainly caused by insufficient welding strengt...Read more -
Preparation for trenchless repair of pipelines
1. Preset the required materials (and add 1m to the actual demand of the existing pipeline). 2. On-site length measurement of the pipeline. 3. Measure the on-site pipeline, understand the size of the tube well, and measure in all directions and all directions. 4. The inspection of mechanical equi...Read more -
How to prevent decarburization of steel pipes?
Once decarburization occurs in the production process of the steel pipe, it will affect the subsequent process and reduce the high-quality performance and service life of the steel pipe itself. Therefore, manufacturers usually take appropriate measures to avoid or solve this problem In general, t...Read more -
Three main differences between oil casing pipe and oil drill pipe
1.Uses of oil casing pipe and oil drill pipe: Oil casing is a steel pipe used to support the well wall of oil and gas wells to ensure the normal operation of the entire oil well during the drilling process and after completion. Each well will use several layers of casing according to different dr...Read more -
large-diameter thin-walled pipes
large-diameter thin-walled pipes 1. Generally large-diameter thin-walled pipes are used for the transportation of generally lower-pressure fluids such as water, gas, air, oil and heating steam. 2. Ordinary carbon steel wire bushings are steel pipes used to protect wires in electrical installation...Read more